Handle special characters of HTTP POST

Merge C3MA code back into the source

.gitignore

@@ -1,3 +1,6 @@
 wlancfg.lua
+config.lua
+simulation.config.lua
 *.swp
 unit/testTimesMarchOctoberWithAllSeconds.lua
+diet/*

Readme.md

@@ -1,12 +1,106 @@
 # ESP Wordclock
 ## Setup
-Generate a wlancfg.lua for your wifi based on the given example wlancfg.lua.example
 
-Copy the required files to the microcontroller:
+### Initial Setup
+Install the firmware on the ESP:
+The ESP must be set into the bootloader mode, like [this](https://www.ccc-mannheim.de/wiki/ESP8266#Boot_Modi)
+
+The firmware can be downloaded with the following script:
 <pre>
- sudo ./programESP.sh serial wlancfg.lua.lua wlancfg.lua
- sudo ./programESP.sh serial init.lua init.lua
+cd os/
+./flash.sh ttyUSB0
 </pre>
 
-## Internal Setup
+Connect to the ESP via a terminal emulator like screen using a baud rate of 115200. Then format the filesystem and reboot the ESP with the following commands:
+<pre>
+file.format()
+node.restart()
+</pre>
+
+Then disconnect the serial terminal and copy the required files to the microcontroller:
+<pre>
+./tools/initialDietFlash.sh /dev/ttyUSB0
+</pre>
+
+Install the optional packages:
+<pre>
+./tools/initialDietFlash.sh /dev/ttyUSB0 mqtt.lua
+./tools/initialDietFlash.sh /dev/ttyUSB0 mqtt2.lua
+./tools/initialDietFlash.sh /dev/ttyUSB0 ds18b20.lua
+</pre>
+
+
+
+### Upgrade
+
+Determine the IP address of your clock and execute the following script:
+<pre>
+./tools/remoteFlash.sh IP-Address
+</pre>
+
+## Hardware Setup
+Mandatory:
 * GPIO2     LEDs
+* GPIO0	    Bootloader (at start)
+* GPIO0	    factory reset (long during operation)
+
+Optional:
+* ADC       VT93N2, 48k  light resistor  
+* GPIO4     DS18B20 Temperatur sensor
+
+## MQTT Interface
+### Status
+* **basetopic**/brightness **Current brightness in percent**
+* **basetopic**/background **Current background color**
+* **basetopic**/color **Current foreground color**
+* **basetopic**/color1 **Current foreground color for first minute**
+* **basetopic**/color2 **Current foreground color for second minute**
+* **basetopic**/color3 **Current foreground color for third minute**
+* **basetopic**/color4 **Current foreground color for fourth minute**
+* **basetopic**/row1 **Current background color**
+* **basetopic**/temp **Temperatur**
+
+### Commands
+* **basetopic**/cmd/single
+  * ON **Set brightness to 100%**
+  * OFF **Set brightness to 0%**
+  * 0-100 **Set brightness to given value**
+  * #rrggbb **Background color is set to hex representation of red, green and blue**
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/color
+  * 0-255,0-255,0-255 **Foreground color is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/color1
+  * 0-255,0-255,0-255 **Foreground color for first minute is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/color2
+  * 0-255,0-255,0-255 **Foreground color for second minute is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/color3
+  * 0-255,0-255,0-255 **Foreground color for third minute is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/color4
+  * 0-255,0-255,0-255 **Foreground color for fourth minute is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/telnet
+  * ignored **Stop MQTT server, clock and start telnetserver at port 23**
+* **basetopic**/cmd/row1
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/row1
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/row2
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+* **basetopic**/cmd/row3
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+* For all rows...
+* **basetopic**/cmd/row10
+  * 0-255,0-255,0-255 **Background color is set to decimal representation of red, green an blue**
+
+
+## OpenHAB2
+Tested MQTT with binding-mqtt 2.5.x
+### Configuration
+```
+Thing mqtt:topic:wordclock "Wordclock" (mqtt:broker) @ "MQTT"  {
+  Channels:
+   Type dimmer : dim "Dimming" [ stateTopic="basetopic/brightness", commandTopic="basetopic/cmd/single" ]
+   Type string : cmd "Command" [ commandTopic="basetopic/cmd/single" ]
+   Type switch : active "Active" [ commandTopic="basetopic/cmd/single" ]
+   Type colorRGB : background "Background" [ stateTopic="basetopic/background", commandTopic="basetopic/cmd/single", on="28,0,0", off="0,0,0" ]
+}
+```

commands.lua

@@ -0,0 +1,186 @@
+function storeConfig(_ssid, _password, _timezoneoffset, _sntpserver, _inv46, _dim, _fcolor, _colorMin1, _colorMin2, _colorMin3, _colorMin4, _bcolor, _threequater)
+
+if ( (_ssid == nil) and
+    (_password == nil) and
+    (_timezoneoffset == nil) and
+    (_sntpserver == nil) and
+    (_inv46 == nil) and
+    (_dim == nil) and
+    (_fcolor == nil) and
+    (_colorMin1 == nil) and
+    (_colorMin2 == nil) and
+    (_colorMin3 == nil) and
+    (_colorMin4 == nil) and
+    (_bcolor == nil) and
+    (_threequater == nil) ) then
+  print("one parameter is mandatory:")
+  print("storeConfig(ssid, ")
+  print(" password,")
+  print(" timezoneoffset,")
+  print(" sntpserver,")
+  print(" inv46,")
+  print(" dim,")
+  print(" fcolor,")
+  print(" colorMin1,")
+  print(" colorMin2,")
+  print(" colorMin3,")
+  print(" colorMin4,")
+  print(" bcolor,")
+  print(" threequater)")
+  print(" ")
+  print("e.g.:")
+  print('storeConfig(nil, nil, 1, nil, "on", true, "00FF00", "00FF88", "008888", "00FF44", "004488", "000000", true)')
+ return
+end
+
+if (_password==nil) then
+    _, password, _, _ = wifi.sta.getconfig()
+    print("Restore password")
+else
+    password = _password
+end
+if (_ssid==nil) then
+    ssid, _, _, _ = wifi.sta.getconfig()
+else
+    ssid = _ssid
+end
+
+if (_sntpserver == nil) then
+  sntpserver = sntpserverhostname
+  print("Restore SNTP: " .. tostring(sntpserver))
+else
+  sntpserver = _sntpserver
+end
+
+if (_timezoneoffset ~= nil) then
+timezoneoffset = _timezoneoffset
+end
+if (_inv46 ~= nil) then
+if ((_inv46 == true) or (_inv == "on")) then
+  inv46 = "on"
+elseif ((_inv46 == false) or (_inv == "off")) then
+  inv46 = "off"
+else
+  inv46 = "off"
+end
+end
+if ( _dim ~= nil) then
+ dim = _dim
+end
+if (_fcolor ~= nil) then
+ fcolor = _fcolor
+end
+if (_bcolor ~= nil) then
+ bcolor = _bcolor
+end
+if (_colorMin1 ~= nil) then
+ colorMin1 = _colorMin1
+end
+if (_colorMin2 ~= nil) then
+ colorMin2 = _colorMin2
+end
+if (_colorMin3 ~= nil) then
+ colorMin3 = _colorMin3
+end
+if (_colorMin4 ~= nil) then
+ colorMin4 = _colorMin4
+end
+if (_threequater ~= nil) then
+ threequater = _threequater
+end
+
+print("SSID = " .. tostring(ssid))
+print("TZNE = " .. tostring(timezoneoffset))
+print("NTP  = " .. tostring(sntpserver))
+print("INVT = " .. tostring(inv46))
+print("DIM  = " .. tostring(dim))
+print("FCOL = " .. tostring(fcolor))
+print("BCOL = " .. tostring(bcolor))
+print("MIN1 = " .. tostring(colorMin1))
+print("MIN2 = " .. tostring(colorMin2))
+print("MIN3 = " .. tostring(colorMin3))
+print("MIN4 = " .. tostring(colorMin4))
+print("3QRT = " .. tostring(threequater))
+
+local configFile="config.lua"
+-- Safe configuration:
+file.remove(configFile .. ".new")
+sec, _ = rtctime.get()
+file.open(configFile.. ".new", "w+")
+file.write("-- Config\n" .. "station_cfg={}\nstation_cfg.ssid=\"" .. ssid .. "\"\nstation_cfg.pwd=\"" .. password .. "\"\nstation_cfg.save=false\nwifi.sta.config(station_cfg)\n")
+file.write("sntpserverhostname=\"" .. sntpserver .. "\"\n" .. "timezoneoffset=\"" .. timezoneoffset .. "\"\n".. "inv46=\"" .. tostring(inv46) .. "\"\n" .. "dim=\"" .. tostring(dim) .. "\"\n")
+
+if (fcolor ~= nil) then
+    local hexColor=string.sub(fcolor, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("color=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    -- fill the current values
+    color=string.char(green, red, blue)
+end
+if (colorMin1  ~= nil) then
+    local hexColor=string.sub(colorMin1, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("color1=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    color1=string.char(green, red, blue)
+end
+if ( colorMin2  ~= nil) then
+    local hexColor=string.sub(colorMin2, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("color2=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    color2=string.char(green, red, blue)
+end
+if ( colorMin3  ~= nil) then
+    local hexColor=string.sub(colorMin3, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("color3=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    color3=string.char(green, red, blue)
+end
+if ( colorMin4  ~= nil) then
+    local hexColor=string.sub(colorMin4, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("color4=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    color4=string.char(green, red, blue)
+end
+if ( bcolor  ~= nil) then
+    local hexColor=string.sub(bcolor, 1)
+    local red = tonumber(string.sub(hexColor, 1, 2), 16)
+    local green = tonumber(string.sub(hexColor, 3, 4), 16)
+    local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+    file.write("colorBg=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+    -- fill the current values
+    colorBg=string.char(green, red, blue)
+end
+if (getTime ~= nil) then
+    time = getTime(sec, timezoneoffset)
+    file.write("print(\"Config from " .. time.year .. "-" .. time.month .. "-" .. time.day .. " " .. time.hour .. ":" .. time.minute .. ":" .. time.second .. "\")\n")
+end
+if ( threequater ~= nil) then
+    file.write("threequater=true\n")
+    -- fill the current values
+    threequater=true
+else
+    file.write("threequater=nil\n") -- unset threequater
+    -- fill the current values
+    threequater=nil
+end
+file.close()
+collectgarbage()
+sec=nil
+file.remove(configFile)
+if (file.rename(configFile .. ".new", configFile)) then
+    print("Rename Successfully")
+else
+   print("Cannot rename " .. configFile .. ".new")
+end
+
+end

displayword.lua

@@ -0,0 +1,372 @@
+-- Module filling a buffer, sent to the LEDs
+local M
+do
+
+local data={}
+
+-- Utility function for round
+local round = function(num)
+    under = math.floor(num)
+    upper = math.floor(num) + 1
+    underV = -(under - num)
+    upperV = upper - num
+    if (upperV > underV) then
+        return under
+    else
+        return upper
+    end
+end
+
+-- @fn updateColor
+-- Module displaying of the words
+-- @param data		struct with the following paramter:
+-- 	aoC 		amount of characters for the complete message
+-- 	mC		amout of minutes to show
+-- 	dC  		drawn characters
+local updateColor = function (data)
+    if (data.aoC > 0) and (data.mC ~= nil) then   
+	local specialChar = data.dC
+	if (data.mC < 1) then
+	  specialChar = 0
+	elseif (data.dC > data.mC) then
+	  specialChar = 0
+	end
+    	if (specialChar < 1) then
+    	    return data.colorFg
+    	elseif (specialChar < 2) then 
+    	    return data.colorM1
+    	elseif (specialChar < 3) then 
+    	    return data.colorM2
+    	elseif (specialChar < 4) then 
+    	    return data.colorM3
+    	elseif (specialChar < 5) then 
+    	    return data.colorM4
+    	else
+    	    return data.colorFg
+    	end
+    else
+	    return data.colorFg
+    end
+end
+
+local drawLEDs = function(data, offset, numberNewChars)
+    if (numberNewChars == nil) then
+        numberNewChars=0
+    end
+    if (data.rgbBuffer == nil) then
+    	return
+    end
+    for i=1,numberNewChars do
+        data.dC=data.dC+1
+        data.rgbBuffer:set(tonumber(offset + i - 1), updateColor(data))
+    end
+end
+
+-- @fn swapLine
+-- @param lineOffset  offset (starting at 1) where the line is located to be swapped
+-- works on the rgbBuffer, defined in data struct
+-- @return <code>false</code> on errors, else <code>true</code>
+local swapLine = function(data, lineOffset)
+ if (data.rgbBuffer == nil) then
+   return false
+ end
+ for i = 0,4 do
+   local num=tonumber(lineOffset)+i
+   local num2=tonumber(tonumber(lineOffset)+10-i)
+   local tmpC1, tmpC2, tmpC3=data.rgbBuffer:get(num)
+   local c1, c2, c3 =data.rgbBuffer:get(num2)
+   data.rgbBuffer:set(num, c1, c2, c3)
+   data.rgbBuffer:set(num2, tmpC1, tmpC2, tmpC3)
+ end
+ return true
+end
+
+-- @fn generateLEDs
+-- Module displaying of the words
+-- @param rgbBuffer	 OutputBuffer with 114 LEDs
+-- @param words
+-- @param colorBg 	 background color
+-- @param colorFg 	 foreground color
+-- @param colorM1 	 foreground color if one minute after a displayable time is present
+-- @param colorM2 	 foreground color if two minutes after a displayable time is present
+-- @param colorM3 	 foreground color if three minutes after a displayable time is present
+-- @param colorM4 	 foreground color if four minutes after a displayable time is present
+-- @param invertRows	 wheather line 4,5 and 6 shall be inverted or not
+-- @param aoC 		 Amount of characters to be displayed
+local generateLEDs = function(rgbBuffer, words, colorBg, colorFg, colorM1, colorM2, colorM3, colorM4, invertRows, aoC)
+ -- Set the local variables needed for the colored progress bar
+ if (words == nil) then
+   return nil
+ end
+ if (invertRows == nil) then
+    invertRows=false
+ end
+
+ local minutes=0
+ if (words.m1 == 1) then
+   minutes = minutes + 1
+ elseif (words.m2 == 1) then
+   minutes = minutes + 2
+ elseif (words.m3 == 1) then
+   minutes = minutes + 3
+ elseif (words.m4 == 1) then
+   minutes = minutes + 4
+ end
+ -- always set a foreground value
+ if (colorFg == nil) then
+	colorFg = string.char(255,255,255)
+ end
+
+ if (aoC ~= nil) then
+   data.aoC = aoC
+   data.mC = minutes
+ else
+   data.aoC = 0
+ end
+ data.rgbBuffer = rgbBuffer
+
+ if ( (adc ~= nil) and (words.briPer ~= nil) ) then
+    local per = math.floor(100*adc.read(0)/1000)
+    words.briPer = tonumber( ((words.briPer * 4) +  per) / 5)
+    print("Minutes : " .. tostring(minutes) .. " bright: " .. tostring(words.briPer) .. "% current: " .. tostring(per) .. "%")
+    data.colorFg   = string.char(string.byte(colorFg,1) * briPer / 100, string.byte(colorFg,2) * briPer / 100, string.byte(colorFg,3) * briPer / 100) 
+    data.colorM1 = string.char(string.byte(colorM1,1) * briPer / 100, string.byte(colorM1,2) * briPer / 100, string.byte(colorM1,3) * briPer / 100)
+    data.colorM2 = string.char(string.byte(colorM2,1) * briPer / 100, string.byte(colorM2,2) * briPer / 100, string.byte(colorM2,3) * briPer / 100)
+    data.colorM3 = string.char(string.byte(colorM3,1) * briPer / 100, string.byte(colorM3,2) * briPer / 100, string.byte(colorM3,3) * briPer / 100)
+    data.colorM4 = string.char(string.byte(colorM4,1) * briPer / 100, string.byte(colorM4,2) * briPer / 100, string.byte(colorM4,3) * briPer / 100)
+ else
+    -- devide by five (Minute 0, Minute 1 to Minute 4 takes the last chars)
+    data.colorFg=colorFg
+    data.colorM1=colorM1
+    data.colorM2=colorM2
+    data.colorM3=colorM3
+    data.colorM4=colorM4
+ end
+ data.dC=0 -- drawn characters
+ local charsPerLine=11
+ 
+ -- Background color must always be set
+ if (colorBg ~= nil) then
+  rgbBuffer:fill(string.byte(colorBg,1), string.byte(colorBg,2), string.byte(colorBg,3)) -- draw the background
+ end
+
+ local lineIdx=1
+ -- line 1----------------------------------------------
+ if (rowbgColor[1] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[1]) end
+ end
+ if (words.it==1) then
+    drawLEDs(data, lineIdx, 2) -- ES
+ end
+ -- K fill character
+ if (words.is == 1) then
+    drawLEDs(data, lineIdx+3, 3) -- IST
+ end
+ -- L fill character
+ if (words.m5== 1) then
+    drawLEDs(data, lineIdx+7, 4) -- FUENF
+ end
+ -- line 2-- even row (so inverted) --------------------
+ lineIdx=12
+  if (rowbgColor[2] ~= nil) then
+     for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[2]) end
+  end
+ if (words.m10 == 1) then
+    drawLEDs(data, lineIdx, 4) -- ZEHN
+ end
+ if (words.m20 == 1) then
+    drawLEDs(data, lineIdx + 4, 7) -- ZWANZIG
+ end
+ -- swap line
+ swapLine(data,lineIdx)
+ -- line3----------------------------------------------
+ lineIdx=23
+  if (rowbgColor[3] ~= nil) then
+     for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[3]) end
+  end
+ if (words.h3q == 1) then
+    drawLEDs(data,lineIdx, 11) -- DREIVIERTEL
+  elseif (words.hq == 1) then
+    drawLEDs(data, lineIdx + 4, 7) -- VIERTEL
+ end
+ --line 4-------- even row (so inverted) -------------
+ lineIdx=34
+ if (rowbgColor[4] ~= nil) then
+     for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[4]) end
+  end
+ if (words.ha == 1) then
+    -- TG
+    drawLEDs(data, lineIdx + 2, 4) -- NACH
+ end
+ if (words.hb == 1) then
+    drawLEDs(data, lineIdx + 6, 3) -- VOR
+ end
+ if (invertRows ~= true) then
+   swapLine(data,lineIdx)
+ end
+ -- line 5 ----------------------------------------------
+ lineIdx=45
+ if (rowbgColor[5] ~= nil) then
+     for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[5]) end
+  end
+ if (words.half == 1) then
+    drawLEDs(data, lineIdx, 4) -- HALB
+     -- X
+ end
+ if (words.h12 == 1) then
+    drawLEDs(data, lineIdx + 5,5) -- ZWOELF
+    -- P
+ end
+ if (invertRows == true) then
+   swapLine(data,lineIdx)
+ end
+ ------------even row (so inverted) ---------------------
+ lineIdx=56
+ if (rowbgColor[6] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[6]) end
+  end
+ if (words.h7 == 1) then
+    drawLEDs(data, lineIdx + 5, 6) -- SIEBEN
+ elseif (words.h1l == 1) then
+    drawLEDs(data, lineIdx + 2,4) -- EINS
+ elseif (words.h1 == 1) then
+    drawLEDs(data, lineIdx + 2, 3) -- EIN
+ elseif (words.h2 == 1) then
+    drawLEDs(data, lineIdx, 4) -- ZWEI
+ end
+ if (invertRows ~= true) then
+   swapLine(data,lineIdx)
+ end
+ ------------------------------------------------
+ lineIdx=67
+ if (rowbgColor[7] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[7]) end
+  end
+ if (words.h3 == 1) then
+    drawLEDs(data, lineIdx + 1,4) -- DREI
+ elseif (words.h5 == 1) then
+    drawLEDs(data, lineIdx + 7, 4) -- FUENF
+ end
+ ------------even row (so inverted) ---------------------
+ lineIdx=78
+ if (rowbgColor[8] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[8]) end
+  end
+ if (words.h4 == 1) then
+    drawLEDs(data, lineIdx + 7, 4) -- VIER
+  elseif (words.h9 == 1) then
+    drawLEDs(data, lineIdx + 3, 4) -- NEUN
+ elseif (words.h11 == 1) then
+    drawLEDs(data, lineIdx, 3) -- ELF
+ end
+ swapLine(data,lineIdx)
+ ------------------------------------------------
+ lineIdx=89
+ if (rowbgColor[9] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[9]) end
+  end
+ if (words.h8 == 1) then
+    drawLEDs(data, lineIdx + 1, 4) -- ACHT
+  elseif (words.h10 == 1) then
+    drawLEDs(data, lineIdx + 5, 4) -- ZEHN
+ end
+
+ ------------even row (so inverted) ---------------------
+ lineIdx=100
+ if (rowbgColor[10] ~= nil) then
+    for i=lineIdx,lineIdx+10, 1 do data.rgbBuffer:set(i, rowbgColor[10]) end
+  end
+ if (words.h6 == 1) then
+    drawLEDs(data, lineIdx + 1, 5) -- SECHS
+ end
+ if (words.cl == 1) then
+    drawLEDs(data, lineIdx + 8, 3) -- UHR
+ end
+ swapLine(data,lineIdx)
+------ Minutes -----------
+ if (words.m1 == 1) then
+    data.rgbBuffer:set(111, colorFg)
+ end
+ if (words.m2 == 1) then
+    data.rgbBuffer:set(112, colorFg)
+  end
+ if (words.m3 == 1) then
+    data.rgbBuffer:set(113, colorFg)
+  end
+ if (words.m4 == 1) then
+    data.rgbBuffer:set(114, colorFg)
+  end
+  collectgarbage()
+end
+
+-- Count amount of characters to display
+local countChars = function(words)
+    local characters = 0
+    for key,value in pairs(words) do 
+        if (value > 0) then
+          if (key == "it") then
+            characters = characters + 2
+          elseif (key == "is") then
+            characters = characters + 3
+          elseif (key == "m5") then
+            characters = characters + 4
+          elseif (key == "m10") then
+            characters = characters + 4
+          elseif (key == "ha") then
+            characters = characters + 4
+          elseif (key == "hb") then
+            characters = characters + 3
+          elseif (key == "h3") then
+            characters = characters + 4
+          elseif (key == "hq") then
+            characters = characters + 7
+          elseif (key == "h3q") then
+            characters = characters + 11
+          elseif (key == "half") then
+            characters = characters + 4
+          elseif (key == "h1") then
+            characters = characters + 3
+          elseif (key == "h1l") then
+            characters = characters + 4
+          elseif (key == "h2") then
+            characters = characters + 4
+          elseif (key == "h3") then
+            characters = characters + 4
+          elseif (key == "h4") then
+            characters = characters + 4
+          elseif (key == "h5") then
+            characters = characters + 4
+          elseif (key == "h6") then
+            characters = characters + 4
+          elseif (key == "h7") then
+            characters = characters + 6
+          elseif (key == "h8") then
+            characters = characters + 4
+          elseif (key == "h9") then
+            characters = characters + 4
+          elseif (key == "h10") then
+            characters = characters + 4
+          elseif (key == "h11") then
+            characters = characters + 3
+          elseif (key == "h12") then
+            characters = characters + 5
+          elseif (key == "m20") then
+            characters = characters + 7
+          elseif (key == "cl") then
+            characters = characters + 3
+          end
+        end
+     end
+    return characters
+end
+
+M = {
+    generateLEDs = generateLEDs,
+    round        = round,
+    drawLEDs     = drawLEDs,
+    updateColor  = updateColor,
+    data         = data,
+    countChars   = countChars
+}
+end
+return M

ds18b20.lua

@@ -0,0 +1,138 @@
+--------------------------------------------------------------------------------
+-- DS18B20 one wire module for NODEMCU
+-- NODEMCU TEAM
+-- LICENCE: http://opensource.org/licenses/MIT
+-- Vowstar <vowstar@nodemcu.com>
+-- 2015/02/14 sza2 <sza2trash@gmail.com> Fix for negative values
+--------------------------------------------------------------------------------
+
+-- Set module name as parameter of require
+local modname = ...
+local M = {}
+_G[modname] = M
+--------------------------------------------------------------------------------
+-- Local used variables
+--------------------------------------------------------------------------------
+-- DS18B20 dq pin
+local pin = nil
+-- DS18B20 default pin
+local defaultPin = 9
+--------------------------------------------------------------------------------
+-- Local used modules
+--------------------------------------------------------------------------------
+-- Table module
+local table = table
+-- String module
+local string = string
+-- One wire module
+local ow = ow
+-- Timer module
+local tmr = tmr
+-- Limited to local environment
+setfenv(1,M)
+--------------------------------------------------------------------------------
+-- Implementation
+--------------------------------------------------------------------------------
+C = 0
+F = 1
+K = 2
+function setup(dq)
+  pin = dq
+  if(pin == nil) then
+    pin = defaultPin
+  end
+  ow.setup(pin)
+end
+
+function addrs()
+  setup(pin)
+  tbl = {}
+  ow.reset_search(pin)
+  repeat
+    addr = ow.search(pin)
+    if(addr ~= nil) then
+      table.insert(tbl, addr)
+    end
+    tmr.wdclr()
+  until (addr == nil)
+  ow.reset_search(pin)
+  return tbl
+end
+
+function readNumber(addr, unit)
+  result = nil
+  setup(pin)
+  flag = false
+  if(addr == nil) then
+    ow.reset_search(pin)
+    count = 0
+    repeat
+      count = count + 1
+      addr = ow.search(pin)
+      tmr.wdclr()
+    until((addr ~= nil) or (count > 100))
+    ow.reset_search(pin)
+  end
+  if(addr == nil) then
+    return result
+  end
+  crc = ow.crc8(string.sub(addr,1,7))
+  if (crc == addr:byte(8)) then
+    if ((addr:byte(1) == 0x10) or (addr:byte(1) == 0x28)) then
+      -- print("Device is a DS18S20 family device.")
+      ow.reset(pin)
+      ow.select(pin, addr)
+      ow.write(pin, 0x44, 1)
+      -- tmr.delay(1000000)
+      present = ow.reset(pin)
+      ow.select(pin, addr)
+      ow.write(pin,0xBE,1)
+      -- print("P="..present)
+      data = nil
+      data = string.char(ow.read(pin))
+      for i = 1, 8 do
+        data = data .. string.char(ow.read(pin))
+      end
+      -- print(data:byte(1,9))
+      crc = ow.crc8(string.sub(data,1,8))
+      -- print("CRC="..crc)
+      if (crc == data:byte(9)) then
+        t = (data:byte(1) + data:byte(2) * 256)
+        if (t > 32767) then
+          t = t - 65536
+        end
+        if(unit == nil or unit == C) then
+          t = t * 625
+        elseif(unit == F) then
+          t = t * 1125 + 320000
+        elseif(unit == K) then
+          t = t * 625 + 2731500
+        else
+          return nil
+        end
+        t = t / 100
+        -- print("Temperature="..t1.."."..t2.." Centigrade")
+        -- result = t1.."."..t2
+        return t
+      end
+      tmr.wdclr()
+    else
+    -- print("Device family is not recognized.")
+    end
+  else
+  -- print("CRC is not valid!")
+  end
+  return result
+end
+
+function read(addr, unit)
+  t = readNumber(addr, unit)
+  if (t == nil) then
+    return nil
+  else
+    return t
+  end
+end
+
+-- Return module table
+return M

init.lua

@@ -0,0 +1,85 @@
+uart.setup(0, 115200, 8, 0, 1, 1 )
+print("Autostart in 5 seconds...")
+
+ws2812.init() -- WS2812 LEDs initialized on GPIO2
+local MAXLEDS=110
+local counter1=0
+ws2812.write(string.char(0,0,0):rep(114))
+local bootledtimer = tmr.create()
+bootledtimer:register(75, tmr.ALARM_AUTO, function (timer)
+    counter1=counter1+1
+    spaceLeds = math.max(MAXLEDS - (counter1*2), 0)
+    ws2812.write(string.char(16,0,0):rep(counter1) .. string.char(0,0,0):rep(spaceLeds) .. string.char(0,0,8):rep(counter1))
+    if ((counter1*2) > 114) then
+        timer:unregister()
+    end
+end)
+bootledtimer:start()
+
+function mydofile(mod)
+    print("load:" .. mod)
+    if (file.open(mod ..  ".lua")) then
+      dofile( mod .. ".lua")
+    elseif (file.open(mod ..  "_diet.lua")) then
+      dofile(mod .. "_diet.lua")      
+    elseif (file.open(mod ..  "_diet.lc")) then
+      dofile(mod .. "_diet.lc")      
+    elseif (file.open(mod)) then
+        dofile(mod)
+    else
+      print("NA: " .. mod)
+    end
+end    
+
+initTimer = tmr.create()
+initTimer:register(5000, tmr.ALARM_SINGLE, function (t)
+    bootledtimer:unregister()
+    initTimer:unregister()
+    initTimer=nil
+    bootledtimer=nil
+    local modlist = { "timecore" , "displayword", "ds18b20", "mqtt", "main", "webserver" }
+    for i,mod in pairs(modlist) do
+        if (file.open(mod .. "_diet.lua")) then
+            file.remove(mod .. "_diet.lc")
+            print(tostring(i) .. ". Compile " .. mod)
+            ws2812.write(string.char(0,0,0):rep(11*i)..string.char(128,0,0):rep(11))
+            node.compile(mod .. "_diet.lua")
+            print("cleanup..")
+            file.remove(mod .. "_diet.lua")
+            node.restart()
+            return
+        end
+    end
+    
+    if ( file.open("config.lua") ) then
+        --- Normal operation
+        print("Starting main")      
+        mydofile("main")
+        wifi.setmode(wifi.STATION)
+        dofile("config.lua")
+        normalOperation()
+    else
+        -- Logic for inital setup
+	collectgarbage()
+	wifi.setmode(wifi.SOFTAP)
+	cfg={}
+	cfg.ssid="wordclock"
+	cfg.pwd="wordclock"
+	wifi.ap.config(cfg)
+
+	-- Write the buffer to the LEDs
+	local color=string.char(0,128,0)
+	local white=string.char(0,0,0)
+	local ledBuf= white:rep(6) .. color .. white:rep(7) .. color:rep(3) .. white:rep(44) .. color:rep(3) .. white:rep(50)
+	ws2812.write(ledBuf)
+	color=nil
+	white=nil
+	ledBuf=nil
+
+	print("Waiting in access point >wordclock< for Clients")
+	print("Please visit 192.168.4.1")
+	-- start the webserver module 
+        mydofile("webserver")
+    end
+end)
+initTimer:start()

main.lua

@@ -0,0 +1,268 @@
+-- Main Module
+mlt = tmr.create() -- Main loop timer
+rowbgColor= {}
+-- Buffer of the clock
+rgbBuffer = ws2812.newBuffer(114, 3) 
+-- 110 Character plus one LED for each minute, 
+-- that cannot be displayed, as the clock as only a resolution of 5 minutes
+
+function syncTimeFromInternet()
+  if (syncRunning == nil) then
+    print("NTP: " .. tostring(sntpserverhostname))
+    syncRunning=true
+    sntp.sync(sntpserverhostname,
+     function(sec,usec,server)
+      syncRunning=nil
+     end,
+     function()
+       print('NTP failed!')
+       syncRunning=nil
+     end
+   )
+  end
+end
+
+function displayTime()
+    collectgarbage()
+     local sec, usec = rtctime.get()
+     -- Handle lazy programmer:
+     if (timezoneoffset == nil) then
+        timezoneoffset=0
+     end
+     local tc = require("timecore_diet")
+     if (tc == nil) then
+     	return
+     end
+     local time = tc.getTime(sec, timezoneoffset)
+     tc = nil
+     timecore_diet=nil
+     package.loaded["timecore_diet"]=nil
+
+     collectgarbage()
+     local wc = require("wordclock_diet")
+     if (wc ~= nil) then
+       words = wc.timestat(time.hour, time.minute)
+       if ((dim ~= nil) and (dim == "on")) then
+        words.briPer=briPer
+        if (words.briPer ~= nil and words.briPer < 3) then
+          words.briPer=3
+        end
+       else
+        words.briPer=nil
+       end
+     end
+     wc = nil
+     wordclock_diet=nil
+     package.loaded["wordclock_diet"]=nil
+
+     collectgarbage()
+     local dw = require("displayword_diet")
+     if (dw ~= nil) then
+        --if lines 4 to 6 are inverted due to hardware-fuckup, unfuck it here
+        local invertRows=false
+        if ((inv46 ~= nil) and (inv46 == "on")) then
+            invertRows=true
+        end
+        local c = dw.countChars(words)
+        dw.generateLEDs(rgbBuffer, words, colorBg, color, color1, color2, color3, color4, invertRows, c)
+     end
+     dw = nil
+     displayword_diet=nil
+     package.loaded["displayword_diet"]=nil
+
+     collectgarbage()
+    
+     -- cleanup
+     i=nil
+     briPer=words.briPer
+     words=nil
+     time=nil
+     collectgarbage()
+end
+
+function normalOperation()
+    -- use default color, if nothing is defined
+    if (color == nil) then
+        -- Color is defined as GREEN, RED, BLUE
+        color=string.char(0,0,250)
+    end
+    print("start: " , node.heap())
+    -------------------------------------------------------------
+    -- Define the main loop
+    local setupCounter=5
+    local alive=0
+    mlt:register(1000, tmr.ALARM_AUTO, function (lt)
+      if (setupCounter > 4) then
+	if (colorBg ~= nil) then
+	  rgbBuffer:fill(string.byte(colorBg,1), string.byte(colorBg,2), string.byte(colorBg,3)) -- disable all LEDs
+	else
+	  rgbBuffer:fill(0,0,0) -- disable all LEDs
+	end
+        syncTimeFromInternet()
+        setupCounter=setupCounter-1
+        alive = 1
+	rgbBuffer:set(19, color) -- N
+	rgbBuffer:set(31, color) -- T
+        if ((inv46 ~= nil) and (inv46 == "on")) then
+	   rgbBuffer:set(45, color) -- P
+        else
+	   rgbBuffer:set(55, color) -- P
+	end
+      elseif (setupCounter > 3) then
+       if (web == nil) then
+        -- Here the WLAN is found, and something is done
+        mydofile("mqtt")
+	rgbBuffer:fill(0,0,0) -- disable all LEDs
+        if (startMqttClient ~= nil) then
+	 if ((inv46 ~= nil) and (inv46 == "on")) then
+	   rgbBuffer:set(34, color) -- M
+         else
+	   rgbBuffer:set(44, color) -- M
+	 end
+	 rgbBuffer:set(82, color) -- T
+         startMqttClient()
+        else
+	    print("NO Mqtt found")
+	    mydofile("telnet")
+        end
+       else
+	    print("webserver prepared")
+       end
+        setupCounter=setupCounter-1
+      elseif (setupCounter > 2) then
+       if (web == nil) then
+        if (startTelnetServer ~= nil) then
+	    startTelnetServer()
+        else
+	    displayTime()
+        end
+       else
+	    print("webserver supplant telnet")
+       end
+        setupCounter=setupCounter-1
+      elseif ( (alive % 120) == 0) then
+        -- sync the time every 5 minutes
+      	local heapusage = node.heap()
+      	if (heapusage > 12000) then
+		syncTimeFromInternet()
+	end
+    	heapusage=nil
+        alive = alive + 1
+      else
+	if (colorBg ~= nil) then
+	  rgbBuffer:fill(string.byte(colorBg,1), string.byte(colorBg,2), string.byte(colorBg,3)) -- disable all LEDs
+	else
+	  rgbBuffer:fill(0,0,0) -- disable all LEDs
+	end
+       displayTime()
+       alive = alive + 1
+      end
+      if (rgbBuffer ~= nil) then
+	  -- show Mqtt status
+	  if (startMqttClient ~= nil) then
+		if (not	connectedMqtt()) then
+		 rgbBuffer:set(103, 0, 64,0)
+		 -- check every thirty seconds, if reconnecting is necessary
+		 if (((tmr.now() / 1000000) % 100) == 30) then
+		   print("MQTT reconnecting... ")
+		   reConnectMqtt()
+	         end
+		end
+          end
+     	  ws2812.write(rgbBuffer)
+      else
+	  -- set FG to fix value: RED
+	  local color = string.char(255,0,0)
+	  rgbBuffer:fill(0,0,0) -- disable all LEDs
+	  for i=108,110, 1 do rgbBuffer:set(i, color) end
+	  ws2812.write(rgbBuffer)
+	  print("Fallback no time displayed")
+      end
+      collectgarbage()
+      -- Feed the system watchdog.
+      tmr.wdclr()
+    end)
+    
+    -------------------------------------------------------------
+    -- Connect to Wifi
+    local connect_counter=0
+    -- Wait to be connect to the WiFi access point. 
+    local wifitimer = tmr.create()
+    wifitimer:register(500, tmr.ALARM_AUTO, function (timer)
+      connect_counter=connect_counter+1
+      if wifi.sta.status() ~= 5 then
+         print(connect_counter ..  "/60 Connecting to AP...")
+         rgbBuffer:fill(0,0,0) -- clear all LEDs
+         if (connect_counter % 5 ~= 4) then
+            local wlanColor=string.char((connect_counter % 6)*20,(connect_counter % 5)*20,(connect_counter % 3)*20)
+            if ((connect_counter % 5) >= 1) then
+		rgbBuffer:set(7, wlanColor)
+            end
+            if ((connect_counter % 5) >= 3) then
+		rgbBuffer:set(15, wlanColor)
+            end
+            if ((connect_counter % 5) >= 2) then
+		rgbBuffer:set(16, wlanColor)
+            end
+            if ((connect_counter % 5) >= 0) then
+		rgbBuffer:set(17, wlanColor)
+            end
+         end
+	 ws2812.write(rgbBuffer)
+      else
+        wifitimer:unregister()
+        wifitimer=nil
+        connect_counter=nil
+        print('IP: ',wifi.sta.getip(), " heap: ", node.heap())
+         rgbBuffer:fill(0,0,0) -- clear all LEDs
+	 rgbBuffer:set(13, color) -- I
+         if ((inv46 ~= nil) and (inv46 == "on")) then
+	   rgbBuffer:set(45, color) -- P
+         else
+	   rgbBuffer:set(55, color) -- P
+	 end
+	 ws2812.write(rgbBuffer)
+        mlt:start()
+      end
+    end)
+    wifitimer:start()
+    
+end
+
+-------------------main program -----------------------------
+briPer = 50   -- Default brightness is set to 50%
+ws2812.init() -- WS2812 LEDs initialized on GPIO2
+
+----------- button ---------
+gpio.mode(3, gpio.INPUT)
+local btnCounter=0
+-- Start the time Thread handling the button
+local btntimer = tmr.create()
+btntimer:register(500, tmr.ALARM_AUTO, function (t)
+     if (gpio.read(3) == 0) then
+	-- stop the main loop
+	if (mlt ~= nil) then
+	    mlt:unregister()
+	    mlt = nil
+	end
+        print("Button pressed " .. tostring(btnCounter))
+        btnCounter = btnCounter + 5
+	
+	if ((web ~= nil) and (btnCounter < 50)) then
+  	  for i=1,btnCounter do rgbBuffer:set(i, 128, 0, 0) end
+	else
+  	  for i=1,btnCounter do rgbBuffer:set(i, 0, 128, 0) end
+	end
+	ws2812.write(rgbBuffer)
+        if (btnCounter >= 110) then
+            file.remove("config.lua")
+            file.remove("config.lc")
+            node.restart()
+	elseif (btnCounter == 10) then
+	    collectgarbage()
+	    mydofile("webserver")
+	    -- start the webserver module
+        end
+     end
+end)
+btntimer:start()

mqtt.lua

@@ -0,0 +1,277 @@
+-- Module Variables
+-- Mqtt variable
+local mMqttClient=nil
+local mMqttConnected = false
+
+function handleSingleCommand(client, topic, data)
+    if (data == "ON") then
+      briPer=100
+      mMqttClient:publish(mqttPrefix .. "/clock", "ON", 0, 0)
+    elseif (data == "OFF") then
+      briPer=0
+      mMqttClient:publish(mqttPrefix .. "/clock", "OFF", 0, 0)
+    elseif ((data:sub(1,1) == "#" and data:len() == 7) or (string.match(data, "%d+,%d+,%d+"))) then
+      local red=0
+      local green=0
+      local blue=0
+      if (data:sub(1,1) == "#") then
+        red = tonumber(data:sub(2,3), 16)
+        green = tonumber(data:sub(4,5), 16)
+        blue = tonumber(data:sub(6,7), 16)
+      else
+        red, green, blue = string.match(data, "(%d+),(%d+),(%d+)")
+      end
+      colorBg=string.char(green * briPer / 100, red * briPer / 100, blue * briPer / 100)
+      print("Updated BG: " .. tostring(red) .. "," .. tostring(green) .. "," .. tostring(blue) )
+      mMqttClient:publish(mqttPrefix .. "/background", tostring(red) .. "," .. tostring(green) .. "," .. tostring(blue), 0, 0)
+    else
+      if (tonumber(data) >= 0 and tonumber(data) <= 100) then
+        briPer=tonumber(data)
+        mMqttClient:publish(mqttPrefix .. "/clock", tostring(data), 0, 0)
+      else
+        print "Unknown MQTT command"
+      end
+    end
+
+end
+
+-- Parse MQTT data and extract color
+-- @param data MQTT information
+-- @param row string of the row e.g. "row1" used to publish current state
+-- @param per percent the color should be dimmed
+function parseBgColor(data, row, per)
+  local red=nil
+  local green=nil
+  local blue=nil
+  if (data:sub(1,1) == "#") then
+    red = tonumber(data:sub(2,3), 16)
+    green = tonumber(data:sub(4,5), 16)
+    blue = tonumber(data:sub(6,7), 16)
+  else
+    red, green, blue = string.match(data, "(%d+),(%d+),(%d+)")
+  end
+  if ((red ~= nil) and (green ~= nil) and (blue ~= nil) ) then
+    mMqttClient:publish(mqttPrefix .. "/"..row, tostring(red) .. "," .. tostring(green) .. "," .. tostring(blue), 0, 0)
+    if (per ~= nil) then
+      return string.char(green * per / 100, red * per / 100, blue * per / 100)
+    else
+      return string.char(green , red , blue )
+    end
+  else
+    return nil
+  end
+end
+
+function readTemp(ds18b20)
+  if (ds18b20 ~= nil) then
+    local addrs=ds18b20.addrs()
+    -- Total DS18B20 numbers
+    local sensors=table.getn(addrs)
+    local temp1=0
+    if (sensors >= 1) then
+        temp1=ds18b20.read(addrs[0])
+    else
+        print("No sensor DS18B20 found")
+    end
+    return temp1
+  else
+    print("No DS18B20 lib")
+    return nil
+  end
+end
+
+-- Connect or reconnect to mqtt server
+function reConnectMqtt()
+ if (not mMqttConnected) then
+    mMqttClient:connect(mqttServer, 1883, false, function(c)
+      print("MQTT is connected")
+      mMqttConnected = true
+      -- subscribe topic with qos = 0
+      mMqttClient:subscribe(mqttPrefix .. "/cmd/#", 0)
+      local tmr1 = tmr.create()
+      tmr1:register(1000, tmr.ALARM_SINGLE, function (dummyTemp)
+	  -- publish a message with data = hello, QoS = 0, retain = 0
+	  mMqttClient:publish(mqttPrefix .. "/ip", tostring(wifi.sta.getip()), 0, 0)
+          local red = string.byte(colorBg,2)
+          local green = string.byte(colorBg,1)
+          local blue = string.byte(colorBg,3)
+          mMqttClient:publish(mqttPrefix .. "/background", tostring(red) .. "," .. tostring(green) .. "," .. tostring(blue), 0, 0)
+	  tmr1:unregister()
+	  tmr1=nil
+      end)
+      tmr1:start()
+    end,
+    function(client, reason)
+      print("failed reason: " .. reason)
+      mMqttConnected = false
+    end)
+ end
+end
+
+-- MQTT extension
+function registerMqtt()
+    mMqttClient = mqtt.Client("wordclock", 120)
+    -- on publish message receive event
+    mMqttClient:on("message", function(client, topic, data)
+      collectgarbage()
+      if data ~= nil then
+        local heapusage = node.heap()
+        if (heapusage < 11000) then        
+          print("Skip " .. topic .. ":" .. data .. "; heap:" .. heapusage)
+          heapusage=nil
+      	  return
+        end
+        heapusage=nil
+        print("MQTT " .. topic .. ":" .. data)
+        if (topic == (mqttPrefix .. "/cmd/single")) then
+            handleSingleCommand(client, topic, data)
+        elseif (topic == (mqttPrefix .. "/cmd/num/val")) then
+	    if (( data == "" ) or (data == nil)) then
+		tw=nil
+		print("MQTT | wordclock failed")
+	    else
+		    -- generate the temperatur to display, once as it will not change
+		    local dispTemp = tonumber(data)
+		    collectgarbage()
+		    if (dispTemp > 0) then
+		    local wc = require("wordclock_diet")
+		    if (wc ~= nil) then
+			tw  = wc.showText(dw, rgbBuffer, invertRows, dispTemp)
+			print("MQTT | generated words for: " .. tostring(dispTemp))
+		    else
+			print("MQTT | wordclock failed")
+		    end
+		    wc = nil
+		    wordclock_diet=nil
+                    package.loaded["wordclock_diet"]=nil
+		    else
+		      tw=nil
+		    end
+	    end
+       elseif (topic == (mqttPrefix .. "/cmd/num/col")) then
+	    -- Set number of the color to display
+	    if (( data ~= "" ) and (data ~= nil)) then
+	        tcol = parseBgColor(data, "num/col")
+	    else
+	        tcol = nil
+		print("MQTT | Hide number")
+	    end
+       else
+            -- Handle here the /cmd/# sublevel
+            if (string.match(topic, "telnet$")) then
+                client:publish(mqttPrefix .. "/telnet", tostring(wifi.sta.getip()), 0, 0)
+                ws2812.write(string.char(0,0,0):rep(114))
+                print("Stop Mqtt and Temp")
+                m=nil
+                t=nil
+                mMqttConnected = false
+		if (mlt ~= nil) then
+	          mlt:unregister()
+		else
+	          print("main loop unstoppable")
+		end
+                collectgarbage()
+                mydofile("telnet")
+                if (startTelnetServer ~= nil) then
+                    startTelnetServer()
+		else
+		    print("Cannost start Telnet Server!")
+                end
+	   elseif (string.match(topic, "color$")) then
+	        color = parseBgColor(data, "color")
+                print("Updated color" )
+           elseif (string.match(topic, "color1$")) then
+	        color1 = parseBgColor(data, "color1")
+                print("Updated color1" )
+           elseif (string.match(topic, "color2$")) then
+	        color2 = parseBgColor(data, "color2")
+                print("Updated color2" )
+           elseif (string.match(topic, "color3$")) then
+	        color3 = parseBgColor(data, "color3")
+                print("Updated color3" )
+           elseif (string.match(topic, "color4$")) then
+	        color4 = parseBgColor(data, "color4")
+                print("Updated color4" )
+		--FIXME load here the mqtt2 file
+           else
+             for i=1,10,1 do
+              if (string.match(topic, "row".. tostring(i) .."$")) then
+                rowbgColor[i] = parseBgColor(data, "row" .. tostring(i), briPer)
+                return
+              end
+             end
+           end 
+        end
+      end
+    end)
+    -- do something
+    mMqttClient:on("offline", function(client)
+	print("MQTT Disconnected")
+	mMqttConnected = false
+        collectgarbage()
+    end)
+    reConnectMqtt()
+end
+
+function connectedMqtt()
+  return mMqttConnected
+end
+
+function startMqttClient()
+    if (mqttServer ~= nil and mqttPrefix ~= nil) then
+        registerMqtt()
+        print "Started MQTT client"
+	local lSetupTimer = tmr.create()
+	lSetupTimer:register(123, tmr.ALARM_SINGLE, function (kTemp)
+		if (file.open("ds18b20_diet.lc")) then
+		  t=true
+		  print "Setup temperatur"
+		end
+	end)
+    	lSetupTimer:start()
+	local loldBrightness=0
+	local lMqttTimer = tmr.create()
+	local tempCounter=0
+	-- Check every 12 seconds
+	lMqttTimer:register(6321, tmr.ALARM_AUTO, function (kTemp)
+            if (mMqttConnected) then
+            	-- Cleanup the initialization stuff
+            	lSetupTimer=nil
+            	-- Do the action
+                local heapusage = node.heap()
+                local temperatur = nil
+                if (loldBrightness ~= briPer) then
+                 mMqttClient:publish(mqttPrefix .. "/brightness", tostring(briPer), 0, 0)
+                 loldBrightness = briPer
+                else
+                  if ((t ~= nil) and (heapusage > 11900) and (tempCounter > 10)) then
+		     local ds18b20=require("ds18b20_diet")
+		     ds18b20.setup(2) -- GPIO4
+		     readTemp(ds18b20) -- read once, to setup chip	     
+                    temperatur=readTemp(ds18b20)
+                    if (temperatur == 8500) then
+                     temperatur=nil
+                    end
+		     ds18b20=nil
+		     ds18b20_diet=nil
+		     package.loaded["ds18b20_diet"]=nil
+		     tempCounter = 0
+		  else
+		     tempCounter = tempCounter + 1
+	          end	   
+	          collectgarbage()
+                  if (temperatur ~= nil) then
+                    mMqttClient:publish(mqttPrefix .. "/temp", tostring(temperatur/100)..".".. tostring(temperatur%100), 0, 0)
+                  else
+                    mMqttClient:publish(mqttPrefix .. "/heap", tostring(heapusage), 0, 0)
+	            collectgarbage()
+                  end
+                end
+                heapusage=nil
+                temperatur=nil
+            end
+        end)
+	lMqttTimer:start()
+    end
+end
+

mqtt2.lua

@@ -0,0 +1,34 @@
+-- Global Variables
+-- Display other numbers, e.g. Temperatur
+tw=nil
+tcol=nil
+
+function parseMqttSub(client, topic, data)
+
+        if (topic == (mqttPrefix .. "/cmd/num/val")) then
+	    if (( data == "" ) or (data == nil)) then
+		tw=nil
+		print("MQTT | wordclock failed")
+	    else
+		    -- generate the temperatur to display, once as it will not change
+		    local dispTemp = tonumber(data)
+		    collectgarbage()
+		    mydofile("wordclock")
+		    if (wc ~= nil) then
+			tw  = wc.showText(dw, rgbBuffer, invertRows, dispTemp)
+			wc = nil
+			print("MQTT | generated words for: " .. tostring(dispTemp))
+		    else
+			print("MQTT | wordclock failed")
+		    end
+	    end
+       elseif (topic == (mqttPrefix .. "/cmd/num/col")) then
+	    -- Set number of the color to display
+	    if (( data ~= "" ) and (data ~= nil)) then
+	        tcol = parseBgColor(data, "num/col")
+	    else
+	        tcol = nil
+		print("MQTT | Hide number")
+	    end
+      end
+end

ntpTest.lua

@@ -1,31 +0,0 @@
-dofile("wlancfg.lua")
-
--- Wait to be connect to the WiFi access point. 
-tmr.alarm(0, 100, 1, function()
-  if wifi.sta.status() ~= 5 then
-     print("Connecting to AP...")
-  else
-     tmr.stop(0)
-     -- Switch of the booting lamp
-     gpio.write(5, gpio.LOW)
-     print('IP: ',wifi.sta.getip())
-
-    --ptbtime1.ptb.de
-    sntp.sync('192.53.103.108',
-     function(sec,usec,server)
-      print('sync', sec, usec, server)
-     end,
-     function()
-       print('failed!')
-     end
-   )
-
-  end
-end)
-
-
-tmr.alarm(1, 1000, 1 ,function()
- sec, usec = rtctime.get()
- print("Time : " , sec)
-end)
-

os/Readme.md

@@ -0,0 +1,26 @@
+# Nodemcu-firmware
+
+## Release
+* 3.0-release_20201107
+
+## Modules
+Firmware was compiled with the following modules:
+  * LUA_USE_MODULES_ADC
+  * LUA_USE_MODULES_FILE
+  * LUA_USE_MODULES_GPIO
+  * LUA_USE_MODULES_MQTT
+  * LUA_USE_MODULES_NET
+  * LUA_USE_MODULES_NODE
+  * LUA_USE_MODULES_OW
+  * LUA_USE_MODULES_PIPE
+  * LUA_USE_MODULES_RTCTIME
+  * LUA_USE_MODULES_SNTP
+  * LUA_USE_MODULES_TMR
+  * LUA_USE_MODULES_UART
+  * LUA_USE_MODULES_WIFI
+  * LUA_USE_MODULES_WS2812
+
+## Numbers
+Floating point calcuation was disabled:
+  * LUA_NUMBER_INTEGRAL
+

os/blank.bin

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os/flash.sh

@@ -1,20 +1,15 @@
 #!/bin/bash
 
 if [ $# -ne 1 ]; then
- echo "One parameter required: the device of the serial interface"
- echo "$0 <device>"
- echo "e.g.:"
- echo "$0 ttyUSB0"
+   DEVICE=$1
+# check the serial connection
+if [ ! -c $DEVICE ]; then
+ echo "$DEVICE does not exist"
  exit 1
 fi
 
-DEVICE=$1
-
-# check the serial connection
-
-if [ ! -c /dev/$DEVICE ]; then
- echo "/dev/$DEVICE does not exist"
- exit 1
+else
+	print "Autodetect serial port"
 fi
 
 if [ ! -f esptool.py ]; then
@@ -23,11 +18,16 @@ if [ ! -f esptool.py ]; then
  exit 1
 fi
 
-sudo ./esptool.py --port /dev/$DEVICE read_mac
+CMD="python3 esptool.py "
+if [ $# -eq 1 ]; then
+CMD="python3 esptool.py --port $DEVICE "
+fi
+
+$CMD read_mac
 
 if [ $? -ne 0 ]; then
  echo "Error reading the MAC -> set the device into the bootloader!"
  exit 1
 fi
-
-sudo ./esptool.py --port /dev/$DEVICE write_flash 0x00000 0x00000.bin 0x10000 0x10000.bin
+echo "Flashing the new firmware"
+$CMD write_flash -fm dio 0x00000 0x00000.bin 0x10000 0x10000.bin 0x3fc000 esp_init_data_default.bin

simulation/.classpath

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="lib" path="libs/luaj-jme-3.0.1.jar" sourcepath="libs/luaj-3.0.1/src"/>
+	<classpathentry kind="lib" path="libs/luaj-jse-3.0.1.jar"/>
+	<classpathentry kind="lib" path="libs/org.eclipse.paho.client.mqttv3-1.2.5.jar"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

simulation/.gitignore

@@ -0,0 +1,2 @@
+/bin/
+/LuaSim*/

simulation/.project

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>WS2812Emulation</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

simulation/Readme.md

@@ -0,0 +1,12 @@
+# Simulation
+
+The simualation should be started with the following arguments at this position:
+ `../init.lua ws28128ClockLayout.txt config.lua` 
+
+# Use it without Eclipse
+
+Compiling:
+ `javac -d bin/ -cp libs/luaj-jme-3.0.1.jar:libs/luaj-jse-3.0.1.jar:libs/org.eclipse.paho.client.mqttv3-1.2.5.jar $(find src -name '*.java')`
+
+Running:
+ `java -cp libs/luaj-jme-3.0.1.jar:libs/luaj-jse-3.0.1.jar:libs/org.eclipse.paho.client.mqttv3-1.2.5.jar:bin de.c3ma.ollo.WS2812Simulation ../init.lua ws28128ClockLayout.txt config.lua`

simulation/config.lua

@@ -0,0 +1,22 @@
+green2=200
+red=200
+blue=200
+
+color=string.char(0, 0, blue)
+color1=string.char(red, 0, 0)
+color2=string.char(tonumber(red*0.9), 0, 0)
+color3=string.char(tonumber(red*0.8), 0, 0)
+color4=string.char(tonumber(red*0.7), 0, 0)
+
+colorBg=string.char(0,0,0) -- black is the default background color
+sntpserverhostname="ptbtime1.ptb.de"
+timezoneoffset=1
+dim="on"
+mqttServer="192.168.1.1"
+mqttPrefix="test"
+
+if (file.open("simulation.config.lua")) then
+  dofile("simulation.config.lua")
+else
+  print("Default configuration, used")
+end

simulation/libs/.gitignore

@@ -0,0 +1,3 @@
+luaj-3.0.1.zip
+luaj-3.0.1/
+luaj-sources-3.0.1.jar

simulation/libs/Readme.md

@@ -0,0 +1,13 @@
+# Dependencies
+
+## Lua
+The following file is expected here:
+`luaj-3.0.1.zip`
+
+It can be downloaded here:
+https://sourceforge.net/projects/luaj/files/latest/download
+
+## MQTT
+
+It can be downloaded here:
+https://search.maven.org/classic/#search%7Cgav%7C1%7Cg%3A%22org.eclipse.paho%22%20AND%20a%3A%22org.eclipse.paho.client.mqttv3%22

simulation/src/de/c3ma/ollo/LuaSimulation.java

@@ -0,0 +1,17 @@
+package de.c3ma.ollo;
+
+/**
+ * created at 29.12.2017 - 18:29:07<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public interface LuaSimulation {
+
+    public void rebootTriggered();
+
+    public void setSimulationTime(long timeInMillis);
+
+	public void setADC(int value);
+}

simulation/src/de/c3ma/ollo/LuaThreadTmr.java

@@ -0,0 +1,85 @@
+package de.c3ma.ollo;
+
+import org.luaj.vm2.LuaError;
+import org.luaj.vm2.LuaValue;
+
+/**
+ * created at 29.12.2017 - 18:48:27<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class LuaThreadTmr extends Thread {
+    
+	private final int NO_TIMER = -2342;
+    
+    private boolean running = true;
+    
+    private boolean stopped = false;
+
+    private LuaValue code;
+
+    private int delay;
+
+    private final int timerNumber;
+    
+    private LuaValue[] arguments;
+    
+    public LuaThreadTmr(int timerNumber, LuaValue code, boolean endlessloop, int delay) {
+        this.code = code;
+        this.running = endlessloop;
+        this.delay = delay;
+        this.timerNumber = timerNumber;
+    }
+    
+    public LuaThreadTmr(LuaValue code, LuaValue arg1, LuaValue arg2, LuaValue arg3) {
+    	this.code = code;
+        this.running = false;
+        this.delay = 1;
+        this.timerNumber = NO_TIMER;
+        arguments = new LuaValue[3];
+        arguments[0] = arg1;
+        arguments[1] = arg2;
+        arguments[2] = arg3;
+    }
+    
+    @Override
+    public void run() {
+        try {
+            do {
+                Thread.sleep(delay);
+                if (code != null) {
+                	if (arguments == null) {
+                		code.call();
+                	} else {
+                		switch (arguments.length) {
+                		case 1:
+                			code.call(arguments[0]);
+                			break;
+                		case 2:
+                			code.call(arguments[0], arguments[1]);
+                			break;
+                		case 3:
+                    		code.call(arguments[0], arguments[1], arguments[2]);
+                			break;
+                		}
+                	}
+                }
+            } while(running);
+        } catch (LuaError le) {
+        	System.err.println("[TMR] Timer" + timerNumber + " interrupted, due:" + le.getMessage());
+        } catch(InterruptedException ie) {
+            System.err.println("[TMR] Timer" + timerNumber + " interrupted");
+        }
+        stopped = true;
+    }
+    
+    public boolean isStopped() { return stopped; }
+    
+    public void stopThread() {
+        running = false;
+        code = null;
+    }
+
+}

simulation/src/de/c3ma/ollo/WS2812Simulation.java

@@ -0,0 +1,208 @@
+package de.c3ma.ollo;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import javax.swing.SwingUtilities;
+
+import org.luaj.vm2.Globals;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.jse.JsePlatform;
+
+import de.c3ma.ollo.mockup.DoFileFunction;
+import de.c3ma.ollo.mockup.ESP8266Adc;
+import de.c3ma.ollo.mockup.ESP8266File;
+import de.c3ma.ollo.mockup.ESP8266GPIO;
+import de.c3ma.ollo.mockup.ESP8266Gpio;
+import de.c3ma.ollo.mockup.ESP8266Mqtt;
+import de.c3ma.ollo.mockup.ESP8266Net;
+import de.c3ma.ollo.mockup.ESP8266Node;
+import de.c3ma.ollo.mockup.ESP8266Time;
+import de.c3ma.ollo.mockup.ESP8266Tmr;
+import de.c3ma.ollo.mockup.ESP8266Uart;
+import de.c3ma.ollo.mockup.ESP8266Wifi;
+import de.c3ma.ollo.mockup.ESP8266Ws2812;
+import de.c3ma.ollo.mockup.PrintFunction;
+import de.c3ma.ollo.mockup.ui.WS2812Layout;
+
+/**
+ * created at 28.12.2017 - 13:19:32<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * 
+ * @author ollo<br />
+ */
+public class WS2812Simulation implements LuaSimulation {
+
+	private Globals globals = JsePlatform.standardGlobals();
+	private ESP8266Tmr espTmr = new ESP8266Tmr();
+	private ESP8266File espFile = new ESP8266File();
+	private ESP8266Node espNode = new ESP8266Node(this);
+	private DoFileFunction doFile = new DoFileFunction(globals);
+	private ESP8266Ws2812 ws2812 = new ESP8266Ws2812();
+	private ESP8266Gpio gpio = new ESP8266Gpio();
+	private ESP8266Mqtt mqtt = new ESP8266Mqtt();
+	private ESP8266Adc adc = new ESP8266Adc();
+	private PrintFunction print = new PrintFunction();
+	private String scriptName;
+
+	public WS2812Simulation(File sourceFolder) {
+		globals.load(new ESP8266Uart());
+		globals.load(ws2812);
+		globals.load(espTmr);
+		globals.load(espFile);
+		globals.load(espNode);
+		globals.load(new ESP8266GPIO());
+		globals.load(adc);
+		globals.load(gpio);
+		globals.load(mqtt);
+		globals.load(new ESP8266Wifi());
+		globals.load(new ESP8266Net());
+		globals.load(new ESP8266Time());
+		globals.set("dofile", doFile);
+		globals.set("print", print);
+		adc.setADC(50);
+
+		try {
+			File tempFile = File.createTempFile("NodemcuSimuFile", "");
+			File tempDir = new File(tempFile.getParent() + File.separator + "Nodemcu" + System.currentTimeMillis());
+			tempDir.mkdir();
+
+			System.out.println("[Nodemcu] Directory is " + tempDir.getAbsolutePath());
+
+			// Copy all files into the temporary folder
+			for (File f : sourceFolder.listFiles()) {
+				Files.copy(f.toPath(), new File(tempDir.getAbsolutePath() + File.separator + f.getName()).toPath());
+				// create a diet one
+				if (f.isFile() && 
+						(f.getName().endsWith(".lua") && 
+						(!f.getName().equals("config.lua")))) {
+					String dietName = f.getName().replace(".lua", "_diet.lc");
+					Files.copy(f.toPath(), new File(tempDir.getAbsolutePath() + File.separator + dietName).toPath());
+				}
+			}
+
+			espFile.setWorkingDirectory(tempDir);
+			espNode.setWorkingDirectory(tempDir);
+			doFile.setWorkingDirectory(tempDir);
+		} catch (IOException e) {
+			System.err.println("[Nodemcu] " + e.getMessage());
+			espFile = null;
+			espNode = null;
+		}
+	}
+
+	public static void main(final String[] args) {
+		SwingUtilities.invokeLater(new Runnable() {
+			@Override
+			public void run() {
+				if (args.length == 0) {
+					printUsage();
+					return;
+				}
+
+				if (args.length >= 1) {
+					File f = new File(args[0]);
+					if (f.exists()) {
+						WS2812Simulation simu = new WS2812Simulation(f.getParentFile());
+						System.out.println("File : " + f.getAbsolutePath());
+
+						if (args.length >= 2) {
+							simu.setWS2812Layout(new File(args[1]));
+						}
+						try {
+							if (args.length >= 3) {
+								File additionalFile = new File(args[2]);
+								if (additionalFile.exists() && (simu.doFile != null)) {
+									File targetFile = new File(simu.doFile.getWorkingDirectory()
+											+ File.separator + additionalFile.getName());
+									if (targetFile.exists()) {
+										if (targetFile.delete()) {
+											System.out.println("Removed original " + targetFile.getName() + "");
+										} else {
+											System.err.println("Cannot removed original " + targetFile.getName() + "");
+										}
+									}
+									Files.copy(additionalFile.toPath(), targetFile.toPath());
+									System.out.println("Integrate " + additionalFile.getName() + " into simulation");
+								} else {
+									System.err.println("Script " + args[2] + " cannot be found");
+									printUsage();
+									System.exit(1);
+								}
+							}
+							if (args.length >= 4) {
+							    try {
+							        ESP8266Tmr.gTimingFactor = Integer.parseInt(args[3]);
+							    } catch (NumberFormatException nfe) {
+							        System.err.println("Timing factor not parsable: " + nfe.getMessage());
+							        printUsage();
+							    }
+							}
+
+							simu.callScript(f.getName());
+						} catch (IOException e) {
+							System.err.println("[Nodemcu] " + e.getMessage());
+						}
+					}
+				} else {
+					printUsage();
+				}
+
+			}
+		});
+	}
+
+	private void setWS2812Layout(File file) {
+		if (file.exists()) {
+			WS2812Layout ledLayout = ws2812.setLayout(file, this);
+			print.setPrinter(ledLayout);
+		} else {
+			throw new RuntimeException("WS2812 Layout: " + file.getAbsolutePath() + " does not exists");
+		}
+	}
+
+	private static void printUsage() {
+		System.out.println("Usage:");
+		System.out.println("one argument required: file to execute.");
+		System.out.println(".e.g: init.lua (ws2812 layout configuration) (additional LUA script) (timing speedup factor)");
+	}
+
+	@Override
+	public void rebootTriggered() {
+		System.out.println("=================== Reboot in Simulation -> call it again =================");
+		this.espTmr.stopAllTimer();
+		try {
+			Thread.sleep(200);
+			if (this.scriptName != null) {
+				System.out.println("Reexecuting...");
+				callScript(this.scriptName);
+			}
+		} catch (InterruptedException e) {
+			
+		}
+	}
+
+	private void callScript(String filename) {
+		this.scriptName = filename;
+
+		if ((espFile != null) && (espFile.getFileInWorkingDir(filename) != null)) {
+			LuaValue chunk = globals.loadfile(espFile.getFileInWorkingDir(filename).getAbsolutePath());
+			chunk.call();
+		} else {
+			throw new RuntimeException("Copy into temporary folder failed; script not available");
+		}
+	}
+
+    @Override
+    public void setSimulationTime(long timeInMillis) {
+        ESP8266Time.setOverwrittenTime(timeInMillis);
+    }
+
+	@Override
+	public void setADC(int value) {
+		adc.setADC(value);
+	}
+}

simulation/src/de/c3ma/ollo/mockup/DoFileFunction.java

@@ -0,0 +1,57 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.File;
+
+import org.luaj.vm2.Globals;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.OneArgFunction;
+
+/**
+ * created at 29.12.2017 - 20:23:48<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class DoFileFunction extends OneArgFunction {
+
+    private File workingDir = null;
+    private Globals globals;
+    
+    public DoFileFunction(Globals globals) {
+        this.globals = globals;
+    }
+
+    @Override
+    public LuaValue call(LuaValue luaFilename) {
+        String filename = luaFilename.checkjstring();
+        
+        File f = new File(workingDir.getAbsolutePath() + File.separator + filename);
+        try {
+	        if (f.exists()) {
+	            LuaValue chunk = this.globals.loadfile(f.getAbsolutePath());
+	            chunk.call();
+	            return LuaValue.valueOf(true);
+	        } else {
+	            return LuaValue.valueOf(false);
+	        }
+        } catch (Exception e) {
+        	System.err.println("Cannot load " + f.getName());
+        	e.printStackTrace();
+        	return LuaValue.valueOf(false);
+        }
+    }
+
+    public void setWorkingDirectory(File workingDir) {
+        this.workingDir = workingDir;
+    }
+
+    public String getWorkingDirectory() {
+        if (workingDir != null) {
+            return workingDir.getAbsolutePath();
+        } else {
+            return null;
+        }
+    }
+
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Adc.java

@@ -0,0 +1,47 @@
+package de.c3ma.ollo.mockup;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+/**
+ * created at 24.04.2019 - 21:12:03<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Adc extends TwoArgFunction {
+
+    private int mAdc = 0;
+
+	@Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable adc = new LuaTable();
+        adc.set("read", new Read(this));
+        env.set("adc", adc);
+        env.get("package").get("loaded").set("adc", adc);
+        return adc;
+    }
+
+    private class Read extends VarArgFunction {
+    	
+    	private ESP8266Adc adc;
+
+		public Read(ESP8266Adc a) {
+    		this.adc = a;
+    	}
+    	
+        public Varargs invoke(Varargs varargs) {
+            return LuaValue.valueOf(this.adc.mAdc);
+        }
+    }
+    
+    public void setADC(int newValue) {
+    	this.mAdc = newValue;
+    	System.out.println("[ADC] updated to " + this.mAdc); 
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266File.java

@@ -0,0 +1,101 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.File;
+import java.util.ArrayList;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+
+/**
+ * created at 29.12.2017 - 01:08:53<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266File extends TwoArgFunction {
+
+    private File workingDir = null;
+    
+    private File openedFile = null;
+    
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable file = new LuaTable();
+        file.set("open", new OpenFunction());
+        file.set("list", new ListFunction());
+        file.set("remove", new RemoveFunction());
+        env.set("file", file);
+        env.get("package").get("loaded").set("file", file);
+                
+        return file;
+    }
+ 
+    private class ListFunction extends TwoArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue arg1, LuaValue arg2) {
+            final LuaTable fileList = new LuaTable();
+            
+            if ((workingDir != null) && (workingDir.exists())) {
+                File[] files = workingDir.listFiles();
+                for (File file : files) {
+                    fileList.set(file.getName(), file.getAbsolutePath());
+                }
+            }
+            
+            return fileList;
+        }
+        
+    }
+    
+    private class OpenFunction extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue fileName) {
+            
+            final String codeFileName = fileName.checkjstring();
+            final File f = new File( workingDir.getAbsolutePath() + File.separator + codeFileName);
+            //System.out.println("[FILE] Loading " + codeFileName);
+            if (f.exists()) {
+                ESP8266File.this.openedFile = f;
+            }
+            
+            return LuaValue.valueOf((f.exists()));
+        }
+        
+    }
+
+    private class RemoveFunction extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue fileName) {
+            
+            final String luaFileName = fileName.checkjstring();
+            System.out.println("[FILE] Removing " + luaFileName);
+            File f = new File(workingDir.getAbsolutePath() + File.separator + fileName);
+            if (f.exists()) {
+                return LuaValue.valueOf(f.delete());
+            } else {
+                return LuaValue.valueOf(false);   
+            }
+        }
+        
+    }
+    
+    public void setWorkingDirectory(File workingDir) {
+        this.workingDir = workingDir;        
+    }
+
+    public File getFileInWorkingDir(String filename) {
+        File f = new File (workingDir.getAbsolutePath() + File.separator + filename);
+        if (f.exists()) {
+            return f;
+        } else {
+            return null;
+        }
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266GPIO.java

@@ -0,0 +1,51 @@
+package de.c3ma.ollo.mockup;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+/**
+ * created at 08.05.2019 - 21:33:04<br />
+ * creator: ollo<br />
+ * project: ESP8266GPIO Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266GPIO extends TwoArgFunction {
+
+	@Override
+	public LuaValue call(LuaValue modname, LuaValue env) {
+		env.checkglobals();
+        final LuaTable gpio = new LuaTable();
+        gpio.set("mode", new Mode());
+        gpio.set("read", new Read(this));
+        env.set("gpio", gpio);
+        env.get("package").get("loaded").set("gpio", gpio);
+        return gpio;
+	}
+	
+	private class Read extends VarArgFunction {
+		
+		private ESP8266GPIO mGpio = null;
+		
+		Read(ESP8266GPIO gpio) {
+			this.mGpio = gpio;
+		}
+    	
+        public Varargs invoke(Varargs varargs) {
+        	int pin = varargs.toint(0);
+        	//FIXME add here something to simulate a pin pressing
+            return LuaValue.valueOf((int)1);
+        }
+    }
+	
+	private class Mode extends VarArgFunction {
+    	
+        public Varargs invoke(Varargs varargs) {
+        	System.out.println("[GPIO] mode GPIO" + varargs.toint(0) + "=" + varargs.toint(1));
+            return LuaValue.valueOf(true);
+        }
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Gpio.java

@@ -0,0 +1,90 @@
+package de.c3ma.ollo.mockup;
+
+import java.util.HashMap;
+
+import javax.swing.SwingUtilities;
+
+import org.luaj.vm2.LuaString;
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+/**
+ * created at 18.03.2021 - 21:09:03<br />
+ * creator: ollo<br />
+ * project: Esp8266 GPIO Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Gpio extends TwoArgFunction {
+
+    private static final String DIRECTION_INPUT = "input";
+	private HashMap<Integer, Integer> mInputs = new HashMap<Integer, Integer>();
+
+	@Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable gpio = new LuaTable();
+        gpio.set("mode", new Mode(this));
+        gpio.set("read", new Read(this));
+        gpio.set("INPUT", DIRECTION_INPUT);
+        env.set("gpio", gpio);
+        env.get("package").get("loaded").set("gpio", gpio);
+        return gpio;
+    }
+
+    private class Mode extends VarArgFunction {
+    	
+    	private ESP8266Gpio gpio;
+
+		public Mode(ESP8266Gpio a) {
+    		this.gpio = a;
+    	}
+    	
+        public Varargs invoke(Varargs varargs) {
+        	if (varargs.narg() == 2) {
+        		final int pin = varargs.arg(1).toint();
+        		final LuaString lsDirection = varargs.arg(2).checkstring();
+        		String direction = lsDirection.toString();
+        		if (direction.equals(DIRECTION_INPUT)) {
+        			gpio.mInputs.put(pin, -1);
+        		}
+        		System.out.println("[GPIO] PIN" + pin +" as " + direction);
+        		return LuaValue.valueOf(true);
+        	} else {
+        		return LuaValue.NIL;
+        	}
+        }
+    }
+    
+    private class Read extends OneArgFunction {
+    	
+    	private ESP8266Gpio gpio;
+    	
+    	public Read(ESP8266Gpio a) {
+    		this.gpio = a;
+    	}
+
+		@Override
+		public LuaValue call(LuaValue arg) {
+			int pin = arg.toint();
+			if (mInputs.containsKey(pin)) {
+				return LuaValue.valueOf(mInputs.get(pin));
+			} else {
+				System.out.println("[GPIO] pin" + pin + " not defined (gpio.mode missing)");
+				return LuaValue.NIL;
+			}
+		}
+	}
+    
+    public void setPin(int pin, int newValue) {
+    	if (mInputs.containsKey(pin)) {
+    		mInputs.put(pin, newValue);
+    	} else {
+    		System.out.println("[GPIO] PIN" + pin +" not defined (missing gpio.mode)");
+    	}
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Mqtt.java

@@ -0,0 +1,210 @@
+package de.c3ma.ollo.mockup;
+
+import java.util.UUID;
+
+import org.eclipse.paho.client.mqttv3.IMqttClient;
+import org.eclipse.paho.client.mqttv3.IMqttMessageListener;
+import org.eclipse.paho.client.mqttv3.MqttClient;
+import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
+import org.eclipse.paho.client.mqttv3.MqttException;
+import org.eclipse.paho.client.mqttv3.MqttMessage;
+import org.eclipse.paho.client.mqttv3.MqttPersistenceException;
+import org.eclipse.paho.client.mqttv3.MqttSecurityException;
+import org.luaj.vm2.LuaString;
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+import de.c3ma.ollo.LuaThreadTmr;
+
+/**
+ * 
+ * @author ollo
+ *
+ */
+public class ESP8266Mqtt extends TwoArgFunction implements IMqttMessageListener {
+	
+	private static final String ON_PREFIX = "on_";
+	private static final String MESSAGE = "message";
+	private IMqttClient mMqttClient = null;
+    final LuaTable onMqtt = new LuaTable();
+
+	@Override
+	public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable mqtt = new LuaTable();
+        mqtt.set("Client", new LuaMqttClient());
+        env.set("mqtt", mqtt);
+        env.get("package").get("loaded").set("tmr", mqtt);
+        System.out.println("[MQTT] Modlue loaded");
+        return mqtt;
+    }
+
+	private class LuaMqttClient extends VarArgFunction {
+        public LuaValue invoke(Varargs varargs) {
+            final LuaTable dynMqtt = new LuaTable();
+        	if (varargs.narg() == 2) {
+                final String client = varargs.arg(1).toString().toString();
+                final int timeout = varargs.arg(2).toint();
+	            dynMqtt.set("on", new OnMqtt(client, timeout));
+	            dynMqtt.set("publish", new PublishMqtt());
+	            dynMqtt.set("subscribe", new SubscribeMqtt());
+	            dynMqtt.set("connect", new ConnectMqtt());
+	            System.out.println("[MQTT] New client: " + client + "(" + timeout+ "s)");
+        	}
+            return dynMqtt;
+        }
+    }
+	
+	private class OnMqtt extends VarArgFunction {
+		
+		private String client=null;
+		private int timeout = 0;
+		
+		private OnMqtt(String client, int timeout) {
+			this.client = client;
+			this.timeout = timeout;
+		}
+		
+        public LuaValue invoke(Varargs varargs) {
+            
+        	if (varargs.narg() == 3) {
+        		final LuaTable table = varargs.arg(1).checktable();
+        		final String callback = varargs.arg(2).toString().toString();
+        		final LuaValue code = varargs.arg(3);
+        		System.out.println("[MQTT] on_" + callback + " " + this.client);        		
+        		onMqtt.set(ON_PREFIX + callback, code);
+        	} else {
+        		for(int i=0; i <= varargs.narg(); i++) {
+					System.err.println("[MQTT] On ["+(i) + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+				}
+        		return LuaValue.NIL;
+        	}
+        	return onMqtt;
+        }
+	}
+	
+	private class PublishMqtt extends VarArgFunction {
+				
+        public LuaValue invoke(Varargs varargs) {
+            final LuaTable onMqtt = new LuaTable();
+        	if (varargs.narg() == 5) {
+        		final String topic = varargs.arg(2).toString().toString();
+        		final String message = varargs.arg(3).toString().toString();
+        		final String qos = varargs.arg(4).toString().toString();
+        		final String retain = varargs.arg(4).toString().toString();
+        		if ( !mMqttClient.isConnected()) {
+        			return LuaValue.NIL;
+                }           
+                MqttMessage msg = new MqttMessage(message.getBytes());
+                if (qos.equals("0")) {
+                	msg.setQos(0);
+                }
+                
+                msg.setRetained(!retain.contentEquals("0"));
+                try {
+					mMqttClient.publish(topic,msg);
+	        		System.out.println("[MQTT] publish " + topic);
+				} catch (MqttPersistenceException e) {
+					System.err.println("[MQTT] publish " + topic + " failed : " + e.getMessage());
+				} catch (MqttException e) {
+					System.err.println("[MQTT] publish " + topic + " failed : " + e.getMessage());
+				}      
+        	} else {
+        		for(int i=0; i <= varargs.narg(); i++) {
+					System.err.println("[MQTT] publish ["+(i) + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+				}
+        		return LuaValue.NIL;
+        	}
+        	return onMqtt;
+        }
+	}
+	
+	private class SubscribeMqtt extends VarArgFunction {
+		
+        public LuaValue invoke(Varargs varargs) {
+            final LuaTable subMqtt = new LuaTable();
+            final int numberArg = varargs.narg();
+        	if (numberArg  == 3) {
+        		final String topic = varargs.arg(2).toString().toString();
+        		final int qos = varargs.arg(3).tonumber().toint();
+
+    			try {
+    				if (mMqttClient != null) {
+						mMqttClient.subscribe(topic, ESP8266Mqtt.this);
+	            		System.out.println("[MQTT] subscribe " + topic + " (QoS " + qos + ")");
+            		} else {
+            			throw new Exception("Client not instantiated");
+            		}
+				} catch (MqttSecurityException e) {
+					System.err.println("[MQTT] subscribe " + topic + " (QoS " + qos + ") failed: " + e.getMessage());
+					e.printStackTrace();
+				} catch (MqttException e) {
+					System.err.println("[MQTT] subscribe " + topic + " (QoS " + qos + ") failed: " + e.getMessage());
+					e.printStackTrace();
+				} catch (Exception e) {
+        			System.err.println("[MQTT] subscribe " + topic + " (QoS " + qos + ") failed: " + e.getMessage());
+				}
+        	} else {
+        		for(int i=0; i <= numberArg; i++) {
+					System.err.println("[MQTT] subscribe ["+(i) + "/" + numberArg  + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+				}
+        		return LuaValue.NIL;
+        	}
+        	return subMqtt;
+        }
+	}
+	
+	private class ConnectMqtt extends VarArgFunction {
+		
+        public LuaValue invoke(Varargs varargs) {
+            final LuaTable onMqtt = new LuaTable();
+        	if ((varargs.narg() == 6) && (mMqttClient == null)) {
+        		final LuaTable table = varargs.arg(1).checktable();
+        		final String targetIP = varargs.arg(2).toString().toString();
+        		final int portnumber = varargs.arg(3).toint();
+        		final boolean secureTLS = varargs.arg(4).toboolean();
+        		final LuaValue codeOnConnected = varargs.arg(5);
+        		final LuaValue codeOnFailed = varargs.arg(6);
+        		String publisherId = "LuaSim" + UUID.randomUUID().toString();
+        		try {
+					mMqttClient = new MqttClient("tcp://" + targetIP + ":" + portnumber,publisherId);
+	        		MqttConnectOptions options = new MqttConnectOptions();
+	        		options.setAutomaticReconnect(false);
+	        		options.setCleanSession(true);
+	        		options.setConnectionTimeout(10);
+	        		mMqttClient.connect(options);
+	        		System.out.println("[MQTT] connected to " + targetIP + ":" + portnumber);
+	        		codeOnConnected.call();
+				} catch (MqttException e) {
+					System.err.println("[MQTT] connect failed : " + e.getMessage());
+					codeOnFailed.call();
+				}
+        	} else if (mMqttClient != null) {
+        		System.err.println("[MQTT] client already exists : " + mMqttClient);
+        		return LuaValue.NIL;
+        	} else {
+        		for(int i=0; i <= varargs.narg(); i++) {
+					System.err.println("[MQTT] connect ["+(i) + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+				}
+        		return LuaValue.NIL;
+        	}
+        	return onMqtt;
+        }
+	}
+
+	@Override
+	public void messageArrived(String topic, MqttMessage message) throws Exception {
+		LuaValue messageCallback = onMqtt.get(ON_PREFIX + MESSAGE);
+		if (messageCallback != null) {
+			LuaThreadTmr exec = new LuaThreadTmr(messageCallback, LuaValue.NIL, LuaValue.valueOf(topic), LuaValue.valueOf(message.getPayload()));
+			exec.start();
+			System.out.println("[MQTT] message "+ topic + " : " + message + " received");
+			//FIXME call the LUA code
+		} else {
+			System.err.println("[MQTT] message "+ topic + " : " + message + " without callback");
+		}
+	}
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Net.java

@@ -0,0 +1,103 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.IOException;
+import java.io.InterruptedIOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+
+import org.luaj.vm2.LuaFunction;
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.ThreeArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+
+/**
+ * created at 29.12.2017 - 01:29:40<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Net extends TwoArgFunction {
+    
+    public static final int PORTNUMBER_OFFSET = 4000;
+    
+    protected boolean mServerRunning = true;
+    
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        LuaValue net = LuaValue.tableOf();
+        net.set("createServer", new CreateServerFunction());
+        
+        //FIXME net.set("send", new SendFunction());
+        net.set("TCP", "TCP");
+        env.set("net", net);
+        env.get("package").get("loaded").set("net", net);        
+        return net;
+    }
+    
+    private class CreateServerFunction extends TwoArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue modname, LuaValue globalEnv) {
+        	LuaValue cs = LuaValue.tableOf();
+        	cs.set("listen", new ListenFunction());
+        	return cs;
+        }
+        
+    }
+    
+    private class ListenFunction extends ThreeArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue self, LuaValue port, final LuaValue function) {
+        	if(!self.istable()) {
+        		return NIL;
+        	}
+        	
+            final int portnumber = port.checkint();
+
+            if ((portnumber > 0) && ((portnumber + PORTNUMBER_OFFSET) < 65000)) {
+                System.out.println("[Net] listening " + portnumber + "(simulating at " + (PORTNUMBER_OFFSET+ portnumber) + ")");
+                //FIXME open a new Thread to start the TCP connection
+            }
+            
+            return LuaValue.valueOf(true);
+        }
+        
+    }
+    /*FIXME first idea
+    private class TcpServer extends Thread {
+
+        @Override
+        public void run() {
+
+            LuaFunction onListenFunction = function.checkfunction();
+
+            
+            
+            try
+            {
+                ServerSocket serverSocket = new ServerSocket(PORTNUMBER_OFFSET+portnumber);
+                serverSocket.setSoTimeout( 60000 ); // Timeout after one minute
+            
+                while(mServerRunning) {
+                    Socket client = serverSocket.accept();
+                    System.out.println("[Net] connection from " + client.getInetAddress());
+                }
+                
+            }
+            catch ( InterruptedIOException iioe )
+            {
+              System.err.println( "Timeout nach einer Minute!" );
+            } catch (IOException e) {
+                // TODO Auto-generated catch block
+                e.printStackTrace();
+            }
+            System.out.println("[Net] server stopped");
+        }
+        
+    }
+    */
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Node.java

@@ -0,0 +1,92 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.ZeroArgFunction;
+
+import de.c3ma.ollo.LuaSimulation;
+
+/**
+ * created at 29.12.2017 - 01:29:40<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Node extends TwoArgFunction {
+
+    private File workingDir = null;
+    private LuaSimulation nodemcuSimu;
+    
+    public ESP8266Node(LuaSimulation nodemcuSimu) {
+        this.nodemcuSimu = nodemcuSimu;
+    }
+
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable node = new LuaTable();
+        node.set("compile", new CompileFunction());
+        node.set("restart", new RestartFunction());
+        node.set("heap", new HeapFunction());
+        env.set("node", node);
+        env.get("package").get("loaded").set("node", node);        
+        return node;
+    }
+
+    private class CompileFunction extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue fileName) {
+            final String codeFileName = fileName.checkjstring();
+            final String compiledFileName = fileName.checkjstring().replace(".lua", ".lc");
+            final File f = new File( workingDir.getAbsolutePath() + File.separator + codeFileName);
+            System.out.println("[Node] Compiling " + compiledFileName);
+            final File outf = new File( workingDir.getAbsolutePath() + File.separator + compiledFileName);
+            if (f.exists()) {
+                //Simply copy the file as .lc file
+                try {
+                    Files.copy(f.toPath(), outf.toPath());
+                } catch (IOException e) {
+                    return LuaValue.valueOf(false);
+                }
+            }
+            
+            return LuaValue.valueOf(f.exists());
+        }
+        
+    }
+    
+    private class RestartFunction extends ZeroArgFunction {
+
+        @Override
+        public LuaValue call() {
+            System.out.println("[Node] Restart");
+            nodemcuSimu.rebootTriggered();
+            return LuaValue.valueOf(false);
+        }
+        
+    }
+    
+    private class HeapFunction extends ZeroArgFunction {
+
+        @Override
+        public LuaValue call() {
+            //System.out.println("[Node] Heap");      
+            return LuaValue.valueOf(Runtime.getRuntime().freeMemory());
+        }
+        
+    }
+    
+
+    
+    public void setWorkingDirectory(File workingDir) {
+        this.workingDir = workingDir;        
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Time.java

@@ -0,0 +1,102 @@
+package de.c3ma.ollo.mockup;
+
+import org.luaj.vm2.LuaFunction;
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.ThreeArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.ZeroArgFunction;
+
+/**
+ * created at 29.12.2017 - 00:07:22<br />
+ * creator: ollo<br />
+ * project: Time Emulation<br />
+ * 
+ * Simulating the following modules:
+ * Sntp
+ * rtctime
+ * 
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Time extends TwoArgFunction {
+    
+    private static long gSimulationStartTime = 0;
+    
+    private static long gOverwrittenTime = 0;
+    
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable sntp = new LuaTable();
+        sntp.set("sync", new SyncFunction());
+        env.set("sntp", sntp);
+        final LuaTable rtctime = new LuaTable();
+        rtctime.set("get", new GetFunction());
+        env.set("rtctime", rtctime);
+        env.get("package").get("loaded").set("sntp", sntp);
+        env.get("package").get("loaded").set("rtctime", rtctime);
+                
+        return sntp;
+    }
+
+    /**
+     * Generate a time. If there is no speedup, it is simply the current system time.
+     * Otherwise the time is speedup by the given factor
+     * @return
+     */
+    private long generateCurrenttime() {
+        if (gSimulationStartTime == 0) {
+            gSimulationStartTime = System.currentTimeMillis();
+        }
+        
+        if (gOverwrittenTime == 0) {
+            /* Time simulation is disabled -> calculate something according to the speedup factor */
+            long time = System.currentTimeMillis();
+            if (ESP8266Tmr.gTimingFactor > 1) {
+                time = gSimulationStartTime + ((time - gSimulationStartTime) * ESP8266Tmr.gTimingFactor);
+            }
+            return time;
+        } else {
+            return gOverwrittenTime;
+        }
+    }
+
+    private class SyncFunction extends ThreeArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue server, LuaValue callbackSuccess, LuaValue callbackFailure) {
+            String serverName = server.checkjstring();
+            LuaFunction cb = callbackSuccess.checkfunction();
+            System.out.println("[SNTP] sync " + serverName);
+            /*FIXME also make it possible to simulate the time */
+            long time = generateCurrenttime();
+            int seconds = (int) (time / 1000);
+            int useconds = (int) (time % 1000);
+            cb.call(LuaValue.valueOf(seconds), LuaValue.valueOf(useconds), LuaValue.valueOf(serverName));
+            return LuaValue.valueOf(true);
+        }
+        
+    }
+    
+    private class GetFunction extends ZeroArgFunction {
+
+        @Override
+        public LuaValue call() {
+            LuaValue[] v = new LuaValue[2];            
+            /*FIXME also make it possible to simulate the time */
+            long time = generateCurrenttime();
+            int seconds = (int) (time / 1000);
+            int useconds = (int) (time % 1000);
+            v[0] = LuaValue.valueOf(seconds);
+            v[1] = LuaValue.valueOf(useconds);
+            return LuaValue.varargsOf(v).arg1();
+        }
+        
+    }
+
+    public static void setOverwrittenTime(long timeInMillis) {
+        gOverwrittenTime = timeInMillis;
+    }
+    
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Tmr.java

@@ -0,0 +1,178 @@
+package de.c3ma.ollo.mockup;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+import org.luaj.vm2.lib.ZeroArgFunction;
+
+import de.c3ma.ollo.LuaThreadTmr;
+
+/**
+ * created at 29.12.2017 - 00:07:22<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Tmr extends TwoArgFunction {
+
+    private static final int MAXTHREADS = 10;
+    
+    private static LuaThreadTmr[] allThreads = new LuaThreadTmr[MAXTHREADS];
+    private static LuaThreadTmr[] dynamicThreads = new LuaThreadTmr[MAXTHREADS];
+    private static int dynamicThreadCounter=0;
+
+    public static int gTimingFactor = 1;
+    
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable tmr = new LuaTable();
+        tmr.set("stop", new stop());
+        tmr.set("alarm", new alarm());
+        tmr.set("create", new create());
+        tmr.set("wdclr", new watchDog());
+        tmr.set("ALARM_AUTO", "ALARM_AUTO");
+        tmr.set("ALARM_SINGLE", "ALARM_SINGLE");
+        env.set("tmr", tmr);
+        env.get("package").get("loaded").set("tmr", tmr);
+        
+        /* initialize the Threads */
+        for (Thread t : allThreads) {
+            t = null;
+        }
+        for (Thread t : dynamicThreads) {
+            t = null;
+        }
+        
+        return tmr;
+    }
+
+    private boolean stopTmr(int i) {
+        if (allThreads[i] != null) {
+            allThreads[i].stopThread();
+            allThreads[i] = null;
+            return true;
+        } else {
+            return false;
+        }
+    }
+    
+    private class stop extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue arg) {
+            final int timerNumer = arg.toint();
+            System.out.println("[TMR] Timer" + timerNumer + " stopped");
+            return LuaValue.valueOf(stopTmr(timerNumer));
+        }
+        
+    }
+    
+    private class alarm extends VarArgFunction {
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg()== 4) {
+                final int timerNumer = varargs.arg(1).toint();
+                final byte endlessloop = varargs.arg(3).tobyte();
+                final int delay = varargs.arg(2).toint();
+                final LuaValue code = varargs.arg(4);
+                System.out.println("[TMR] Timer" + timerNumer );
+                
+                if ((timerNumer < 0) || (timerNumer > timerNumer)) {
+                    return LuaValue.error("[TMR] Timer" + timerNumer + " is not available, choose 0 to 6");
+                }
+                
+                if (stopTmr(timerNumer)) {
+                    System.err.println("[TMR] Timer" + timerNumer + " stopped");
+                }
+                
+                /* The cycletime is at least 1 ms */
+                allThreads[timerNumer] = new LuaThreadTmr(timerNumer, code, (endlessloop == 1), Math.max(delay / gTimingFactor, 1));
+                allThreads[timerNumer].start();
+            }
+            return LuaValue.valueOf(true);
+        }
+    }
+    
+    private class dynRegister extends VarArgFunction {
+    	private final int dynIndex;
+    	public dynRegister(int index) {
+    		this.dynIndex = index;
+    	}
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg() == 4) {
+                final String endlessloop = varargs.arg(3).toString().toString();
+                final int delay = varargs.arg(2).toint();
+                final LuaValue code = varargs.arg(4);
+                dynamicThreads[dynIndex] = new LuaThreadTmr(dynIndex, code, (endlessloop.contains("AUTO")), Math.max(delay / gTimingFactor, 1));
+                System.out.println("[TMR] DynTimer" + dynIndex + " registered");
+            }
+            return LuaValue.valueOf(true);
+        }
+    }
+    
+    private class dynStart extends ZeroArgFunction {
+    	private final int dynIndex;
+    	public dynStart(int index) {
+    		this.dynIndex = index;
+    	}
+        public LuaValue call() {
+            if (dynamicThreads[dynIndex] != null) {
+                dynamicThreads[dynIndex].start();
+                System.out.println("[TMR] DynTimer" + dynIndex + " started");
+                return LuaValue.valueOf(true);   
+            } else {
+            	return LuaValue.valueOf(false);
+            }
+        }
+    }
+    
+    private class watchDog extends ZeroArgFunction {
+    	
+        public LuaValue call() {
+            //System.out.println("[TMR] Watchdog fed");
+            return LuaValue.valueOf(true);   
+            
+        }
+    }
+    
+    private class dynStop extends ZeroArgFunction {
+    	private final int dynIndex;
+    	public dynStop(int index) {
+    		this.dynIndex = index;
+    	}
+        public LuaValue call() {
+        	boolean status = false;
+            if (dynamicThreads[dynIndex] != null) {
+            	dynamicThreads[dynIndex].stopThread();
+            	dynamicThreads[dynIndex] = null;
+            	System.out.println("[TMR] DynTimer" + dynIndex + " stopped");
+            	status = true;
+            }
+			return LuaValue.valueOf(status);
+        }
+    }
+    
+    private class create extends ZeroArgFunction {
+        public LuaValue call() {                
+            if (dynamicThreadCounter >= MAXTHREADS) {
+                return LuaValue.error("[TMR] DynTimer" + dynamicThreadCounter + " exeeded maximum");
+            }
+            final LuaTable dynTimer = new LuaTable();
+            dynTimer.set("register", new dynRegister(dynamicThreadCounter));
+            dynTimer.set("start", new dynStart(dynamicThreadCounter));
+            dynTimer.set("unregister", new dynStop(dynamicThreadCounter));
+            dynamicThreadCounter++;
+            return dynTimer;
+        }
+    }
+    
+    public void stopAllTimer() {
+        for (int i = 0; i < allThreads.length; i++) {
+            stopTmr(i);
+        }
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Uart.java

@@ -0,0 +1,38 @@
+package de.c3ma.ollo.mockup;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+
+/**
+ * created at 28.12.2017 - 23:05:05<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Uart extends TwoArgFunction {
+
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable uart = new LuaTable();
+        uart.set("setup", new setup());
+        env.set("uart", uart);
+        env.get("package").get("loaded").set("uart", uart);
+        return uart;
+    }
+
+    private class setup extends VarArgFunction {
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg()== 6) {
+                System.out.println("[UART] " + varargs.arg(2) + " " + varargs.arg(3) 
+                + ((varargs.arg(4).checkint() > 0) ? "Y" : "N") 
+                + varargs.arg(5));
+            }
+            return LuaValue.valueOf(true);
+        }
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Wifi.java

@@ -0,0 +1,81 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.ZeroArgFunction;
+
+import de.c3ma.ollo.LuaSimulation;
+
+/**
+ * created at 29.12.2017 - 01:29:40<br />
+ * creator: ollo<br />
+ * project: WifiEmulation<br />
+ * $Id: $<br />
+ * @author ollo<br />
+ */
+public class ESP8266Wifi extends TwoArgFunction {
+
+    @Override
+    public LuaValue call(LuaValue modname, LuaValue env) {
+        env.checkglobals();
+        final LuaTable wifi = new LuaTable();
+        wifi.set("setmode", new SetModeFunction());
+        final LuaTable ap = new LuaTable();
+        ap.set("config", new ConfigFunction());
+        wifi.set("ap", ap);
+        final LuaTable sta = new LuaTable();
+        sta.set("status", new StatusFunction());
+        sta.set("getip", new GetIpFunction());
+        wifi.set("sta", sta);
+        wifi.set("SOFTAP", "SOFTAP");
+        wifi.set("STATION", "STATION");
+        env.set("wifi", wifi);
+        env.get("package").get("loaded").set("wifi", wifi);        
+        return wifi;
+    }
+
+    private class SetModeFunction extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue apmode) {
+            final String APmodeString = apmode.checkjstring();
+            System.out.println("[Wifi] set mode " + APmodeString);
+            return LuaValue.valueOf(true);
+        }
+        
+    }
+    
+    private class ConfigFunction extends OneArgFunction {
+
+        @Override
+        public LuaValue call(LuaValue arg) {
+            System.out.println("[Wifi] config");
+            return LuaValue.valueOf(true);
+        }
+        
+    }
+    
+    private class StatusFunction extends ZeroArgFunction {
+
+        @Override
+        public LuaValue call() {
+            return LuaValue.valueOf(5);
+        }
+        
+    }
+    
+    private class GetIpFunction extends ZeroArgFunction {
+
+        @Override
+        public LuaValue call() {
+            return LuaValue.valueOf("127.0.0.1");
+        }
+        
+    }
+}

simulation/src/de/c3ma/ollo/mockup/ESP8266Ws2812.java

@@ -0,0 +1,269 @@
+package de.c3ma.ollo.mockup;
+
+import java.awt.Color;
+import java.io.File;
+import java.util.ArrayList;
+
+import javax.swing.SwingUtilities;
+
+import org.luaj.vm2.LuaString;
+import org.luaj.vm2.LuaTable;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.Varargs;
+import org.luaj.vm2.lib.OneArgFunction;
+import org.luaj.vm2.lib.TwoArgFunction;
+import org.luaj.vm2.lib.VarArgFunction;
+import org.luaj.vm2.lib.ZeroArgFunction;
+
+import de.c3ma.ollo.LuaSimulation;
+import de.c3ma.ollo.mockup.ui.WS2812Layout;
+
+/**
+ * created at 28.12.2017 - 23:34:04<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * 
+ * @author ollo<br />
+ */
+public class ESP8266Ws2812 extends TwoArgFunction {
+
+	private static WS2812Layout layout = null;
+
+	@Override
+	public LuaValue call(LuaValue modname, LuaValue env) {
+		env.checkglobals();
+		final LuaTable ws2812 = new LuaTable();
+		ws2812.set("init", new init());
+		ws2812.set("write", new write());
+		ws2812.set("newBuffer", new newBuffer());
+		env.set("ws2812", ws2812);
+		env.get("package").get("loaded").set("ws2812", ws2812);
+		return ws2812;
+	}
+
+	private class init extends ZeroArgFunction {
+
+		@Override
+		public LuaValue call() {
+			System.out.println("[WS2812] init");
+			return LuaValue.valueOf(true);
+		}
+
+	}
+
+	private class write extends OneArgFunction {
+
+		@Override
+		public LuaValue call(LuaValue arg) {
+			if (arg.isstring()) {
+				LuaString jstring = arg.checkstring();
+				final int length = jstring.rawlen();
+
+				if (ESP8266Ws2812.layout == null) {
+					System.err.println("[WS2812] Not initialized (" + length + "bytes to be updated)");
+					return LuaValue.valueOf(false);
+				}
+				
+				if ((length % 3) == 0) {
+					final byte[] array = jstring.m_bytes;
+					SwingUtilities.invokeLater(new Runnable() {
+						@Override
+						public void run() {
+							for (int i = 0; i < length; i += 3) {
+								if (ESP8266Ws2812.layout != null) {
+									int r = array[i + 0]+(Byte.MIN_VALUE*-1);
+									int b = array[i + 1]+(Byte.MIN_VALUE*-1);
+									int g = array[i + 2]+(Byte.MIN_VALUE*-1);
+									ESP8266Ws2812.layout.updateLED(i / 3, r, g, b);
+								}
+							}
+						}
+					});
+				}
+				return LuaValue.valueOf(true);
+			} else {
+				System.out.println("[WS2812] write no string given");
+				return LuaValue.NIL;
+			}
+		}
+	}
+
+	public WS2812Layout setLayout(File file, LuaSimulation nodemcuSimu) {
+		if (ESP8266Ws2812.layout == null) {
+			ESP8266Ws2812.layout = WS2812Layout.parse(file, nodemcuSimu);
+		}
+		return ESP8266Ws2812.layout;
+	}
+	
+	private class newBuffer extends VarArgFunction {
+    	
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg() == 2) {
+                final int leds = varargs.arg(1).toint();
+                final int bytesPerLeds = varargs.arg(2).toint();
+                final LuaTable rgbBuffer = new LuaTable();
+                ArrayList<Color> ledList = new ArrayList<Color>();
+                for(int i=0; i < leds; i++) {
+                	ledList.add(new Color(0,0,0));
+                }
+                rgbBuffer.set("fill", new bufferFill(ledList));
+                rgbBuffer.set("set", new bufferWrite(ledList));
+                rgbBuffer.set("get", new bufferRead(ledList));
+                System.out.println("[WS2812] " + leds + "leds (" + bytesPerLeds + "bytes per led)");                
+                return rgbBuffer;
+            } else {
+            	return LuaValue.NIL;
+            }
+        }
+    }
+	
+	private class bufferFill extends VarArgFunction {
+		
+		private ArrayList<Color> ledList = null;
+		
+		public bufferFill(ArrayList<Color> ledList) {
+			this.ledList = ledList;
+		}
+    	
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg() == 4) {
+            	/* first argument is the object itself */
+                final int red = varargs.arg(2).toint();
+                final int green = varargs.arg(3).toint();
+                final int blue = varargs.arg(4).toint();
+                /* update local buffer */ 
+                for(int i=0; i < ledList.size(); i++) {
+                	ledList.set(i, new Color(red, green, blue));
+                }
+                /* Update GUI */
+                if (ESP8266Ws2812.layout != null) {
+                	SwingUtilities.invokeLater(new Runnable() {
+						@Override
+						public void run() {
+							ESP8266Ws2812.layout.fillLEDs(red, green, blue);
+						}
+                	});
+				}
+                //System.out.println("[WS2812] buffer fill with " + red + "," + green + "," +  blue);
+                return LuaValue.valueOf(true);
+            } else if (varargs.isstring(2)) {
+            	final LuaString color = varargs.arg(2).checkstring();
+            	
+ 				final int length = color.rawlen();
+ 				if ((length == 3) && (ESP8266Ws2812.layout != null)) {
+
+ 					final byte[] array = color.m_bytes;
+ 					final int r = array[0]+(Byte.MIN_VALUE*-1);
+ 					final int b = array[1]+(Byte.MIN_VALUE*-1);
+ 					final int g = array[2]+(Byte.MIN_VALUE*-1);
+ 					/* update local buffer */ 
+ 	                for(int i=0; i < ledList.size(); i++) {
+ 	                	ledList.set(i, new Color(r, g, b));
+ 	                }
+ 	                /* Update GUI */
+ 					SwingUtilities.invokeLater(new Runnable() {
+						@Override
+						public void run() {
+		 					ESP8266Ws2812.layout.fillLEDs(r, g, b);
+						} 
+					});
+ 	 				//System.out.println("[WS2812] buffer fill with " + r + "," + g + "," +  b);
+ 	 				return LuaValue.valueOf(true);
+ 				} else {
+ 					System.err.println("[WS2812] buffer not initialized ("+varargs.narg() +"args) , length "+ length + ", raw:" + color.toString());
+ 	 				return LuaValue.NIL;
+ 				}
+            } else {
+            	System.err.println("[WS2812] fill with " + varargs.narg() + " arguments undefined.");
+            	return LuaValue.NIL;
+            }
+        }
+    }
+	
+	private class bufferWrite extends VarArgFunction {
+		private ArrayList<Color> ledList = null;
+		
+		public bufferWrite(ArrayList<Color> ledList) {
+			this.ledList = ledList;
+		}
+		
+        public Varargs invoke(Varargs varargs) {
+            if (varargs.narg() == 3) {
+                final int index = varargs.arg(2).toint();
+                final LuaString color = varargs.arg(3).checkstring();
+ 				final int length = color.rawlen();
+				if (length == 3) {
+					final byte[] array = color.m_bytes;
+					final int r = array[0]+(Byte.MIN_VALUE*-1);
+					final int b = array[1]+(Byte.MIN_VALUE*-1);
+					final int g = array[2]+(Byte.MIN_VALUE*-1);
+					// update buffer
+	                ledList.set(index - 1, new Color(r, g, b));
+	                
+	                // update GUI
+					SwingUtilities.invokeLater(new Runnable() {
+						@Override
+						public void run() {
+							ESP8266Ws2812.layout.updateLED(index - 1, r, g, b);
+						}
+					});
+	                return LuaValue.valueOf(true);
+				} else {					
+					System.err.println("[WS2812] set with " + varargs.narg() + " arguments at index="+ index + " and "+ length + " charactes not matching");
+	            	return LuaValue.NIL;	
+				}
+            } else if (varargs.narg() == 5) {
+                final int index = varargs.arg(2).toint();
+                final int green = varargs.arg(3).toint();
+                final int red = varargs.arg(4).toint();
+                final int blue = varargs.arg(5).toint();
+                // update buffer
+                ledList.set(index - 1, new Color(red, green, blue));
+                
+                // update GUI
+				SwingUtilities.invokeLater(new Runnable() {
+					@Override
+					public void run() {
+						ESP8266Ws2812.layout.updateLED(index - 1, red, green, blue);
+					}
+				});
+				return LuaValue.valueOf(true);
+            } else {
+				for(int i=0; i <= varargs.narg(); i++) {
+					System.err.println("[WS2812] write ["+(i) + "] (" + varargs.arg(i).typename() + ") " + varargs.arg(i).toString() );
+				}
+            	System.err.println("[WS2812] set with " + varargs.narg() + " arguments undefined.");
+            	return LuaValue.NIL;
+            }
+        }
+    }
+	
+	private class bufferRead extends VarArgFunction {
+		private ArrayList<Color> ledList = null;
+		
+		public bufferRead(ArrayList<Color> ledList) {
+			this.ledList = ledList;
+		}
+		
+		@Override
+		public Varargs invoke(Varargs varargs) {	
+			final int offset = varargs.arg(2).toint();
+			
+			if (ledList != null) {
+				// receiver from buffer
+				Color color = ledList.get(offset - 1);
+				final char[] array = new char[3];
+				array[0] = (char) (color.getRed() );
+				array[1] = (char) (color.getGreen() );
+				array[2] = (char) (color.getBlue() );
+				
+//				System.err.println("[WS2812] reading " + offset + ":" + ((int)array[0]) +"," + ((int) array[1]) + "," + ((int) array[2])  + " from " + color);
+				return LuaString.valueOf(array);
+			}
+
+			System.err.println("[WS2812] reading " + offset + " impossible");
+			return LuaValue.NIL;
+		}
+	}
+}

simulation/src/de/c3ma/ollo/mockup/PrintFunction.java

@@ -0,0 +1,32 @@
+package de.c3ma.ollo.mockup;
+
+import java.io.File;
+
+import org.luaj.vm2.Globals;
+import org.luaj.vm2.LuaValue;
+import org.luaj.vm2.lib.OneArgFunction;
+
+/**
+ * 
+ * @author ollo
+ *
+ */
+public class PrintFunction extends OneArgFunction {
+    
+    private Printable mPrinter;
+
+    public void setPrinter(Printable printer) {
+        this.mPrinter = printer;
+    }
+    
+    @Override
+    public LuaValue call(LuaValue message) {
+        String msg = message.checkjstring();
+        if (mPrinter != null) {
+        	mPrinter.printConsole(msg);
+        	return LuaValue.valueOf(true);
+        } else {
+        	return LuaValue.valueOf(false);
+        }
+    }
+}

simulation/src/de/c3ma/ollo/mockup/Printable.java

@@ -0,0 +1,5 @@
+package de.c3ma.ollo.mockup;
+
+public interface Printable {
+	public void printConsole(String line);
+}

simulation/src/de/c3ma/ollo/mockup/ui/WS2812Layout.java

@@ -0,0 +1,390 @@
+package de.c3ma.ollo.mockup.ui;
+
+import java.awt.BorderLayout;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Font;
+import java.awt.GridLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Calendar;
+import java.util.GregorianCalendar;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import javax.swing.BorderFactory;
+import javax.swing.BoxLayout;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JScrollPane;
+import javax.swing.JSlider;
+import javax.swing.JTextArea;
+import javax.swing.JTextField;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
+import javax.swing.text.DefaultCaret;
+
+import de.c3ma.ollo.LuaSimulation;
+import de.c3ma.ollo.mockup.Printable;
+
+/**
+ * created at 02.01.2018 - 12:57:02<br />
+ * creator: ollo<br />
+ * project: WS2812Emulation<br />
+ * $Id: $<br />
+ * 
+ * @author ollo<br />
+ */
+public class WS2812Layout extends JFrame implements Printable {
+
+	/**
+	 * 
+	 */
+	private static final long serialVersionUID = -6815557232118826140L;
+
+	/**
+	 * Parameter for the ADC brightness control
+	 */
+	private static final int ADC_INIT = 512;
+	private static final int ADC_MIN = 0;
+	private static final int ADC_MAX = 1024;
+
+	private ArrayList<String> mLines = new ArrayList<String>();
+	private int mColumn = 0;
+	private int mRow = 0;
+	private Element[][] mElements;
+	private JTextArea mConsole = null;
+
+    private LuaSimulation nodemcuSimu;
+
+	public WS2812Layout(LuaSimulation nodemcuSimu) {
+	    this.nodemcuSimu = nodemcuSimu;
+    }
+
+    public static WS2812Layout parse(File file, LuaSimulation nodemcuSimu) {
+		WS2812Layout layout = null;
+		try {
+			BufferedReader br = new BufferedReader(new FileReader(file));
+			try {
+				String line = br.readLine();
+				if (line != null) {
+					layout = new WS2812Layout(nodemcuSimu);
+				}
+
+				while (line != null) {
+					if (!line.startsWith("#")) {
+						layout.mLines.add(line);
+						layout.mRow++;
+						layout.mColumn = Math.max(layout.mColumn, line.length());
+					}
+					/* get the next line */
+					line = br.readLine();
+				}
+
+				/* parse each line */
+				layout.parse();
+				layout.createAndDisplayGUI();
+			} finally {
+				if (br != null) {
+					br.close();
+				}
+			}
+		} catch (IOException ioe) {
+
+		}
+		return layout;
+	}
+
+	private void createAndDisplayGUI() {
+		setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+
+		JPanel contentPane = new JPanel();
+		contentPane.setLayout(new BorderLayout());
+		contentPane.setBorder(BorderFactory.createLineBorder(Color.DARK_GRAY, 2));
+
+		JPanel ledPanel = new JPanel();
+		ledPanel.setBackground(Color.BLACK);
+		ledPanel.setLayout(new GridLayout(this.mRow, this.mColumn, 10, 10));
+		for (int i = 0; i < this.mRow; i++) {
+			for (int j = 0; j < this.mColumn; j++) {
+				if (this.mElements[i][j] != null) {
+					ledPanel.add(this.mElements[i][j]);
+				}
+			}
+		}
+		contentPane.add(ledPanel, BorderLayout.CENTER);
+				
+		JSlider adc = new JSlider(JSlider.VERTICAL,
+                ADC_MIN, ADC_MAX, ADC_INIT);
+		adc.addChangeListener(new ChangeListener() {
+			
+			@Override
+			public void stateChanged(ChangeEvent e) {
+				nodemcuSimu.setADC(adc.getValue());
+			}
+		});
+		
+		contentPane.add(adc, BorderLayout.EAST);
+		
+		JPanel bottomShell = new JPanel();
+		bottomShell.setLayout(new javax.swing.BoxLayout(bottomShell, BoxLayout.Y_AXIS));
+		JPanel bottomPanel = new JPanel();
+				
+		final JTextField dateTime = new JTextField("yyyy-mm-dd HH:MM:SS");
+		dateTime.getDocument().addDocumentListener(new DocumentListener() {
+		    public void changedUpdate(DocumentEvent e) {
+		        warn();
+		      }
+		      public void removeUpdate(DocumentEvent e) {
+		        warn();
+		      }
+		      public void insertUpdate(DocumentEvent e) {
+		        warn();
+		      }
+
+		      public void warn() {
+		         final String pattern = "(\\d{4})-(\\d{2})-(\\d{2}) (\\d{2}):(\\d{2}):(\\d{2})";
+		         final String current = dateTime.getText();
+		        
+		         if (current.length() <=0) {
+		             /* color "nothing" green */
+		             dateTime.setForeground(Color.GREEN);
+		             /* disable the time simulation */
+		             nodemcuSimu.setSimulationTime(0);
+		             return;
+		         }
+		         
+		         if (!current.matches(pattern)) {
+		             dateTime.setForeground(Color.RED);
+		         } else {
+		             dateTime.setForeground(Color.BLACK);
+		             Pattern dateTimePattern = Pattern.compile(pattern);
+		             Matcher matcher = dateTimePattern.matcher(current);
+		             int year=0;
+		             int month=0;
+		             int day=0;
+		             int hour=0;
+		             int minute=0;
+		             int second=0;
+		             matcher.find();
+		             for (int g = 1; g <= matcher.groupCount(); g++) {
+		                 switch(g) {
+		                 case 1: /* Year */
+		                     year = Integer.parseInt(matcher.group(g));
+		                     break;
+		                 case 2: /* Month */
+                             month = Integer.parseInt(matcher.group(g));
+                             break;
+		                 case 3: /* Day */
+                             day = Integer.parseInt(matcher.group(g));
+                             break;
+		                 case 4: /* Hour */
+                             hour = Integer.parseInt(matcher.group(g));
+                             break;
+		                 case 5: /* Minute */
+                             minute = Integer.parseInt(matcher.group(g));
+                             break;
+		                 case 6: /* Second */
+                             second = Integer.parseInt(matcher.group(g));
+                             break;
+		                 }	
+		             }
+		             System.out.println("[GUI] Set time to: " + year + "-" + month + "-" + day + " " + hour + ":" + minute + ":" + second);
+		             GregorianCalendar gc = new GregorianCalendar(year, month, day, hour, minute, second);
+		             
+		             nodemcuSimu.setSimulationTime(gc.getTimeInMillis());
+		         }
+		      }
+		    });
+		bottomPanel.add(dateTime);
+
+        final JButton btnSetCurrentTime = new JButton("Set time");
+        btnSetCurrentTime.setActionCommand("Set time");
+        btnSetCurrentTime.addActionListener(new ActionListener() {
+            public void actionPerformed(ActionEvent ae) {
+                JButton but = (JButton) ae.getSource();
+                if (but.equals(btnSetCurrentTime)) {
+                    GregorianCalendar gc = new GregorianCalendar();
+                    dateTime.setText(String.format("%d-%02d-%02d %02d:%02d:%02d",
+                            gc.get(Calendar.YEAR), gc.get(Calendar.MONTH), gc.get(Calendar.DAY_OF_MONTH),
+                            gc.get(Calendar.HOUR_OF_DAY), gc.get(Calendar.MINUTE), gc.get(Calendar.SECOND)));
+                }
+            }
+        });
+        bottomPanel.add(btnSetCurrentTime);
+        
+		final JButton btnReboot = new JButton("Reboot");
+		btnReboot.setActionCommand("Reboot simulation");
+		btnReboot.addActionListener(new ActionListener() {
+			public void actionPerformed(ActionEvent ae) {
+				JButton but = (JButton) ae.getSource();
+				if (but.equals(btnReboot)) {
+				    System.out.println("[Node] Restart");
+		            nodemcuSimu.rebootTriggered();
+				}
+			}
+		});
+		bottomPanel.add(btnReboot);
+		bottomShell.add(bottomPanel);
+
+		mConsole = new JTextArea("Test");
+		mConsole.setEditable(false);
+		mConsole.setMinimumSize(new Dimension(200, 220));
+		mConsole.setMaximumSize(new Dimension(800, 200));
+		mConsole.setDoubleBuffered(true);
+		JScrollPane scrollPane = new JScrollPane(mConsole);
+		//scrollPane.setSize(100, 200);
+		scrollPane.setMinimumSize(new Dimension(800, 200));
+		bottomShell.add(scrollPane);
+		
+		contentPane.add(bottomShell, BorderLayout.SOUTH);
+		
+		setContentPane(contentPane);
+		pack();
+		setLocationByPlatform(true);
+		setVisible(true);
+	}
+
+	private void parse() {
+		this.mElements = new Element[this.mRow][this.mColumn];
+		int row = 0;
+		for (String line : this.mLines) {
+			for (int i = 0; i < line.length(); i++) {
+				char c = line.charAt(i);
+				if ((('A' <= c) && (c <= 'Z')) || (('0' <= c) && (c <= '9')) || (c == 'Ä') || (c == 'Ö')
+						|| (c == 'Ü')) {
+					this.mElements[row][i] = new Element(c);
+				} else {
+					this.mElements[row][i] = new Element();
+				}
+				this.mElements[row][i].setColor(0, 0, 0);
+			}
+			row++;
+		}
+	}
+
+	public class Element extends JLabel {
+
+		/**
+		 * 
+		 */
+		private static final long serialVersionUID = -3933903441113933637L;
+
+		private boolean noText = false;
+
+		/**
+		 * Draw a simple rect
+		 */
+		public Element() {
+			super();
+			this.noText = true;
+			this.setBackground(Color.BLACK);
+		}
+
+		/**
+		 * Draw a character
+		 * 
+		 * @param character
+		 *            to show
+		 */
+		public Element(char character) {
+			super("" + character);
+			setFont(new Font("Dialog", Font.BOLD, 24));
+			setHorizontalAlignment(CENTER);
+			// FIXME: Background color is not updated:
+			this.setBackground(Color.BLACK);
+		}
+
+		public void setColor(int red, int green, int blue) {
+			this.setForeground(new Color(red, green, blue));
+			this.repaint();
+		}
+		
+		public Color getColor() {
+			return this.getForeground();
+		}
+
+		@Override
+		public String toString() {
+			StringBuilder sb = new StringBuilder();
+			if (noText) {
+				sb.append(" ");
+			} else {
+				sb.append("" + this.getText());
+			}
+			sb.append("|" + Integer.toHexString(this.getForeground().getRed()) + " "
+					+ Integer.toHexString(this.getForeground().getGreen()) + " "
+					+ Integer.toHexString(this.getForeground().getBlue()));
+
+			return sb.toString();
+		}
+	}
+
+	public void updateLED(int index, int r, int g, int b) {
+		if (mElements != null) {
+			int i = (index / mColumn);
+			int j = (index % mColumn);
+			// Swap each second row
+			if (i % 2 == 1) {
+				j = (mColumn-1) - j;
+			}
+			if ((i < mElements.length) && (j < mElements[i].length) && (mElements[i][j] != null)) {
+				Element curlbl = mElements[i][j];
+				curlbl.setColor(r, g, b);
+			}
+		}
+	}
+	
+	public Element getLED(int index) {
+		if (mElements != null) {
+			int i = (index / mColumn);
+			int j = (index % mColumn);
+			if (i % 2 == 1) {
+				j = (mColumn-1) - j;
+			}
+			if (i < 0 || j < 0) {
+				System.err.println("LED index" + index + " results in " + i + "x" + j + " coordinate");
+				return null;
+			}
+			
+			if ((i < mElements.length) && (j < mElements[i].length) && (mElements[i][j] != null)) {
+				return mElements[i][j];
+			} else {
+				return null;
+			}
+		} else {
+			return null;
+		}
+	}
+	
+	public void fillLEDs(int r, int g, int b) {
+		if (mElements != null) {
+			for(int i=0;(i < mElements.length); i++) {
+				for (int j=0; (j < mElements[i].length); j++) {
+					if  (mElements[i][j] != null) {
+						Element curlbl = mElements[i][j];
+						curlbl.setColor(r, g, b);
+					}
+				}
+			}
+		}
+	}
+	
+	public void printConsole(String line) {
+		if (mConsole != null) {
+			mConsole.append(line);
+			mConsole.append("\r\n");		
+			mConsole.getCaret().setDot( Integer.MAX_VALUE );
+		}
+	}
+
+}

simulation/ws28128ClockLayout.txt

@@ -0,0 +1,17 @@
+# This file describes the layout of the WS2812 LEDs.
+# _ will only draw a rect
+# A-Z or 1-9 will draw the text or number
+# each element will be updated with its color with the known commands of the nodemcu firmware
+#
+# Here the configuration for the wordclock:
+ESKISTLFÜNF
+ZEHNZWANZIG
+DREIVIERTEL
+TGNACHVORJM
+HALBXZWÖLFP
+ZWEINSIEBEN
+KDREIRHFÜNF
+ELFNEUNVIER
+WACHTZEHNRS
+BSECHSFMUHR
+____

telnet.lua

@@ -0,0 +1,51 @@
+-- Telnet client 
+--[[  A telnet server   T. Ellison,  June 2019
+
+This version of the telnet server demonstrates the use of the new stdin and stout
+pipes, which is a C implementation of the Lua fifosock concept moved into the
+Lua core.  These two pipes are referenced in the Lua registry.
+
+]]
+--luacheck: no unused args
+
+local telnetS = nil
+
+local function telnet_session(socket)
+  local node = node
+  local stdout
+
+  local function output_CB(opipe)   -- upval: socket
+    stdout = opipe
+    local rec = opipe:read(1400)
+    if rec and (#rec > 0) then socket:send(rec) end
+    return false -- don't repost as the on:sent will do this
+  end
+
+  local function onsent_CB(skt)     -- upval: stdout
+    local rec = stdout:read(1400)
+    if rec and #rec > 0 then skt:send(rec) end
+  end
+
+  local function disconnect_CB(skt) -- upval: socket, stdout
+    node.output()
+    socket, stdout = nil, nil -- set upvals to nl to allow GC
+  end
+
+  node.output(output_CB, 0)
+  socket:on("receive", function(_,rec) node.input(rec) end)
+  socket:on("sent", onsent_CB)
+  socket:on("disconnection", disconnect_CB)
+    print( ("Welcome to the Wordclock. (%d mem free, %s)"):format(node.heap(), wifi.sta.getip()))
+    print("- mydofile(\"commands\")")
+    print("- storeConfig()")
+    print("Visite https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en for further commands")
+    uart.write(0, "New client connected\r\n")
+end
+
+
+-- Telnet Server
+function startTelnetServer()
+    telnetS=net.createServer(net.TCP, 180)
+    telnetS:listen(23, telnet_session)
+    print("Telnetserver started")
+end

timecore.lua

@@ -1,3 +1,6 @@
+local M
+do
+
 --Summer winter time convertion
 --See: https://arduinodiy.wordpress.com/2015/10/13/the-arduino-and-daylight-saving-time/
 --
@@ -27,7 +30,7 @@
 -- @var dow       Current day of week       range (1 - 7)   (1 is Monday, 7 is Sunday)
 -- @return <code>true</code> if we have currently summer time
 -- @return <code>false</code> if we have winter time
-function isSummerTime(time)
+local function isSummerTime(time)
   -- we are in 100% in the summer time
   if (time.month > 3 and time.month < 10) then 
     return true
@@ -56,13 +59,13 @@ end
 -- Source:
 -- http://www.jbox.dk/sanos/source/lib/time.c.html
 
-YEAR0=1900
+local YEAR0=1900
 
-EPOCH_YR=1970
+local EPOCH_YR=1970
 --SECS_DAY=(24L * 60L * 60L)
-SECS_DAY=86400
+local SECS_DAY=86400
 
-ytab = {}
+local ytab = {}
 ytab[0] = {}
 ytab[1] = {}
 ytab[0][0] = 31
@@ -103,10 +106,10 @@ local yearsize = function(year)
  end
 end
 
-function getUTCtime(unixtimestmp)
+local function getUTCtime(unixtimestmp)
   local year = EPOCH_YR
   local dayclock = math.floor(unixtimestmp % SECS_DAY)
-  dayno = math.floor(unixtimestmp / SECS_DAY)
+  local dayno = math.floor(unixtimestmp / SECS_DAY)
 
   local sec = math.floor(dayclock % 60)
   local min = math.floor( (dayclock % 3600) / 60)
@@ -119,22 +122,28 @@ function getUTCtime(unixtimestmp)
     year=year + 1
   end
   --Day in whole year: local yday = dayno (Not needed)
-  mon = 0
+  local mon = 0
   while (dayno >= ytab[leapyear(year) and 1 or 0][mon])
   do
       dayno = dayno - ytab[leapyear(year) and 1 or 0][mon];
       mon = mon + 1
    end
-   mday = dayno + 1
+   local mday = dayno + 1
 
   return { year = year, month = (mon+1), day = mday, hour = hour, minute = min, second = sec, dow = dow }
 end
 
 
-function getTime(unixtimestmp, timezoneoffset)
-    time = getUTCtime(unixtimestmp + (3600 * timezoneoffset))
+local getTime = function(unixtimestmp, timezoneoffset)
+    local time = getUTCtime(unixtimestmp + (3600 * timezoneoffset))
     if ( isSummerTime(time) ) then
         time = getUTCtime(unixtimestmp + (3600 * (timezoneoffset + 1)) )
     end
     return time
 end
+-- Pack everything into a module
+M = {
+    getTime = getTime
+}
+end
+return M

tools/Readme.md

@@ -0,0 +1,13 @@
+# luatool.py
+Version 0.8.0 upgraded supported with python 3.x
+## Source:
+https://github.com/4refr0nt/luatool/tree/master/luatool
+# LuaSrcDiet
+LuaSrcDiet reduces the size of Lua 5.1+ source files by aggressively removing all unnecessary whitespace and comments, optimizing constant tokens, and renaming local variables to shorter names.
+* https://github.com/jirutka/luasrcdiet
+
+## Source:
+https://raw.githubusercontent.com/jirutka/luasrcdiet/master/bin/luasrcdiet
+
+## Example:
+ bin/luasrcdiet ../webserver.lua -o ../webserver_diet.lua

tools/bin/luasrcdiet

@@ -0,0 +1,653 @@
+#!/usr/bin/env lua
+---------
+-- LuaSrcDiet
+--
+-- Compresses Lua source code by removing unnecessary characters.
+-- For Lua 5.1+ source code.
+--
+-- **Notes:**
+--
+-- * Remember to update version and date information below (MSG_TITLE).
+-- * TODO: passing data tables around is a horrific mess.
+-- * TODO: to implement pcall() to properly handle lexer etc. errors.
+-- * TODO: need some automatic testing for a semblance of sanity.
+-- * TODO: the plugin module is highly experimental and unstable.
+----
+local equiv = require "luasrcdiet.equiv"
+local fs = require "luasrcdiet.fs"
+local llex = require "luasrcdiet.llex"
+local lparser = require "luasrcdiet.lparser"
+local luasrcdiet = require "luasrcdiet.init"
+local optlex = require "luasrcdiet.optlex"
+local optparser = require "luasrcdiet.optparser"
+
+local byte = string.byte
+local concat = table.concat
+local find = string.find
+local fmt = string.format
+local gmatch = string.gmatch
+local match = string.match
+local print = print
+local rep = string.rep
+local sub = string.sub
+
+local plugin
+
+local LUA_VERSION = match(_VERSION, " (5%.[123])$") or "5.1"
+
+-- Is --opt-binequiv available for this Lua version?
+local BIN_EQUIV_AVAIL = LUA_VERSION == "5.1" and not package.loaded.jit
+
+
+---------------------- Messages and textual data ----------------------
+
+local MSG_TITLE = fmt([[
+LuaSrcDiet: Puts your Lua 5.1+ source code on a diet
+Version %s <%s>
+]], luasrcdiet._VERSION, luasrcdiet._HOMEPAGE)
+
+local MSG_USAGE = [[
+usage: luasrcdiet [options] [filenames]
+
+example:
+  >luasrcdiet myscript.lua -o myscript_.lua
+
+options:
+  -v, --version       prints version information
+  -h, --help          prints usage information
+  -o <file>           specify file name to write output
+  -s <suffix>         suffix for output files (default '_')
+  --keep <msg>        keep block comment with <msg> inside
+  --plugin <module>   run <module> in plugin/ directory
+  -                   stop handling arguments
+
+  (optimization levels)
+  --none              all optimizations off (normalizes EOLs only)
+  --basic             lexer-based optimizations only
+  --maximum           maximize reduction of source
+
+  (informational)
+  --quiet             process files quietly
+  --read-only         read file and print token stats only
+  --dump-lexer        dump raw tokens from lexer to stdout
+  --dump-parser       dump variable tracking tables from parser
+  --details           extra info (strings, numbers, locals)
+
+features (to disable, insert 'no' prefix like --noopt-comments):
+%s
+default settings:
+%s]]
+
+-- Optimization options, for ease of switching on and off.
+--
+-- * Positive to enable optimization, negative (no) to disable.
+-- * These options should follow --opt-* and --noopt-* style for now.
+local OPTION = [[
+--opt-comments,'remove comments and block comments'
+--opt-whitespace,'remove whitespace excluding EOLs'
+--opt-emptylines,'remove empty lines'
+--opt-eols,'all above, plus remove unnecessary EOLs'
+--opt-strings,'optimize strings and long strings'
+--opt-numbers,'optimize numbers'
+--opt-locals,'optimize local variable names'
+--opt-entropy,'tries to reduce symbol entropy of locals'
+--opt-srcequiv,'insist on source (lexer stream) equivalence'
+--opt-binequiv,'insist on binary chunk equivalence (only for PUC Lua 5.1)'
+--opt-experimental,'apply experimental optimizations'
+]]
+
+-- Preset configuration.
+local DEFAULT_CONFIG = [[
+  --opt-comments --opt-whitespace --opt-emptylines
+  --opt-numbers --opt-locals
+  --opt-srcequiv --noopt-binequiv
+]]
+-- Override configurations: MUST explicitly enable/disable everything.
+local BASIC_CONFIG = [[
+  --opt-comments --opt-whitespace --opt-emptylines
+  --noopt-eols --noopt-strings --noopt-numbers
+  --noopt-locals --noopt-entropy
+  --opt-srcequiv --noopt-binequiv
+]]
+local MAXIMUM_CONFIG = [[
+  --opt-comments --opt-whitespace --opt-emptylines
+  --opt-eols --opt-strings --opt-numbers
+  --opt-locals --opt-entropy
+  --opt-srcequiv
+]] .. (BIN_EQUIV_AVAIL and ' --opt-binequiv' or ' --noopt-binequiv')
+
+local NONE_CONFIG = [[
+  --noopt-comments --noopt-whitespace --noopt-emptylines
+  --noopt-eols --noopt-strings --noopt-numbers
+  --noopt-locals --noopt-entropy
+  --opt-srcequiv --noopt-binequiv
+]]
+
+local DEFAULT_SUFFIX = "_"      -- default suffix for file renaming
+local PLUGIN_SUFFIX = "luasrcdiet.plugin." -- relative location of plugins
+
+
+------------- Startup and initialize option list handling -------------
+
+--- Simple error message handler; change to error if traceback wanted.
+--
+-- @tparam string msg The message to print.
+local function die(msg)
+  print("LuaSrcDiet (error): "..msg); os.exit(1)
+end
+--die = error--DEBUG
+
+-- Prepare text for list of optimizations, prepare lookup table.
+local MSG_OPTIONS = ""
+do
+  local WIDTH = 24
+  local o = {}
+  for op, desc in gmatch(OPTION, "%s*([^,]+),'([^']+)'") do
+    local msg = "  "..op
+    msg = msg..rep(" ", WIDTH - #msg)..desc.."\n"
+    MSG_OPTIONS = MSG_OPTIONS..msg
+    o[op] = true
+    o["--no"..sub(op, 3)] = true
+  end
+  OPTION = o  -- replace OPTION with lookup table
+end
+
+MSG_USAGE = fmt(MSG_USAGE, MSG_OPTIONS, DEFAULT_CONFIG)
+
+
+--------- Global variable initialization, option set handling ---------
+
+local suffix = DEFAULT_SUFFIX           -- file suffix
+local option = {}                       -- program options
+local stat_c, stat_l                    -- statistics tables
+
+--- Sets option lookup table based on a text list of options.
+--
+-- Note: additional forced settings for --opt-eols is done in optlex.lua.
+--
+-- @tparam string CONFIG
+local function set_options(CONFIG)
+  for op in gmatch(CONFIG, "(%-%-%S+)") do
+    if sub(op, 3, 4) == "no" and        -- handle negative options
+       OPTION["--"..sub(op, 5)] then
+      option[sub(op, 5)] = false
+    else
+      option[sub(op, 3)] = true
+    end
+  end
+end
+
+
+-------------------------- Support functions --------------------------
+
+-- List of token types, parser-significant types are up to TTYPE_GRAMMAR
+-- while the rest are not used by parsers; arranged for stats display.
+local TTYPES = {
+  "TK_KEYWORD", "TK_NAME", "TK_NUMBER",         -- grammar
+  "TK_STRING", "TK_LSTRING", "TK_OP",
+  "TK_EOS",
+  "TK_COMMENT", "TK_LCOMMENT",                  -- non-grammar
+  "TK_EOL", "TK_SPACE",
+}
+local TTYPE_GRAMMAR = 7
+
+local EOLTYPES = {                      -- EOL names for token dump
+  ["\n"] = "LF", ["\r"] = "CR",
+  ["\n\r"] = "LFCR", ["\r\n"] = "CRLF",
+}
+
+--- Reads source code from the file.
+--
+-- @tparam string fname Path of the file to read.
+-- @treturn string Content of the file.
+local function load_file(fname)
+  local data, err = fs.read_file(fname, "rb")
+  if not data then die(err) end
+  return data
+end
+
+--- Saves source code to the file.
+--
+-- @tparam string fname Path of the destination file.
+-- @tparam string dat The data to write into the file.
+local function save_file(fname, dat)
+  local ok, err = fs.write_file(fname, dat, "wb")
+  if not ok then die(err) end
+end
+
+
+------------------ Functions to deal with statistics ------------------
+
+--- Initializes the statistics table.
+local function stat_init()
+  stat_c, stat_l = {}, {}
+  for i = 1, #TTYPES do
+    local ttype = TTYPES[i]
+    stat_c[ttype], stat_l[ttype] = 0, 0
+  end
+end
+
+--- Adds a token to the statistics table.
+--
+-- @tparam string tok The token.
+-- @param seminfo
+local function stat_add(tok, seminfo)
+  stat_c[tok] = stat_c[tok] + 1
+  stat_l[tok] = stat_l[tok] + #seminfo
+end
+
+--- Computes totals for the statistics table, returns average table.
+--
+-- @treturn table
+local function stat_calc()
+  local function avg(c, l)                      -- safe average function
+    if c == 0 then return 0 end
+    return l / c
+  end
+  local stat_a = {}
+  local c, l = 0, 0
+  for i = 1, TTYPE_GRAMMAR do                   -- total grammar tokens
+    local ttype = TTYPES[i]
+    c = c + stat_c[ttype]; l = l + stat_l[ttype]
+  end
+  stat_c.TOTAL_TOK, stat_l.TOTAL_TOK = c, l
+  stat_a.TOTAL_TOK = avg(c, l)
+  c, l = 0, 0
+  for i = 1, #TTYPES do                         -- total all tokens
+    local ttype = TTYPES[i]
+    c = c + stat_c[ttype]; l = l + stat_l[ttype]
+    stat_a[ttype] = avg(stat_c[ttype], stat_l[ttype])
+  end
+  stat_c.TOTAL_ALL, stat_l.TOTAL_ALL = c, l
+  stat_a.TOTAL_ALL = avg(c, l)
+  return stat_a
+end
+
+
+----------------------------- Main tasks -----------------------------
+
+--- A simple token dumper, minimal translation of seminfo data.
+--
+-- @tparam string srcfl Path of the source file.
+local function dump_tokens(srcfl)
+  -- Load file and process source input into tokens.
+  local z = load_file(srcfl)
+  local toklist, seminfolist = llex.lex(z)
+
+  -- Display output.
+  for i = 1, #toklist do
+    local tok, seminfo = toklist[i], seminfolist[i]
+    if tok == "TK_OP" and byte(seminfo) < 32 then
+      seminfo = "("..byte(seminfo)..")"
+    elseif tok == "TK_EOL" then
+      seminfo = EOLTYPES[seminfo]
+    else
+      seminfo = "'"..seminfo.."'"
+    end
+    print(tok.." "..seminfo)
+  end--for
+end
+
+--- Dumps globalinfo and localinfo tables.
+--
+-- @tparam string srcfl Path of the source file.
+local function dump_parser(srcfl)
+  -- Load file and process source input into tokens,
+  local z = load_file(srcfl)
+  local toklist, seminfolist, toklnlist = llex.lex(z)
+
+  -- Do parser optimization here.
+  local xinfo = lparser.parse(toklist, seminfolist, toklnlist)
+  local globalinfo, localinfo = xinfo.globalinfo, xinfo.localinfo
+
+  -- Display output.
+  local hl = rep("-", 72)
+  print("*** Local/Global Variable Tracker Tables ***")
+  print(hl.."\n GLOBALS\n"..hl)
+  -- global tables have a list of xref numbers only
+  for i = 1, #globalinfo do
+    local obj = globalinfo[i]
+    local msg = "("..i..") '"..obj.name.."' -> "
+    local xref = obj.xref
+    for j = 1, #xref do msg = msg..xref[j].." " end
+    print(msg)
+  end
+  -- Local tables have xref numbers and a few other special
+  -- numbers that are specially named: decl (declaration xref),
+  -- act (activation xref), rem (removal xref).
+  print(hl.."\n LOCALS (decl=declared act=activated rem=removed)\n"..hl)
+  for i = 1, #localinfo do
+    local obj = localinfo[i]
+    local msg = "("..i..") '"..obj.name.."' decl:"..obj.decl..
+                " act:"..obj.act.." rem:"..obj.rem
+    if obj.is_special then
+      msg = msg.." is_special"
+    end
+    msg = msg.." -> "
+    local xref = obj.xref
+    for j = 1, #xref do msg = msg..xref[j].." " end
+    print(msg)
+  end
+  print(hl.."\n")
+end
+
+--- Reads source file(s) and reports some statistics.
+--
+-- @tparam string srcfl Path of the source file.
+local function read_only(srcfl)
+  -- Load file and process source input into tokens.
+  local z = load_file(srcfl)
+  local toklist, seminfolist = llex.lex(z)
+  print(MSG_TITLE)
+  print("Statistics for: "..srcfl.."\n")
+
+  -- Collect statistics.
+  stat_init()
+  for i = 1, #toklist do
+    local tok, seminfo = toklist[i], seminfolist[i]
+    stat_add(tok, seminfo)
+  end--for
+  local stat_a = stat_calc()
+
+  -- Display output.
+  local function figures(tt)
+    return stat_c[tt], stat_l[tt], stat_a[tt]
+  end
+  local tabf1, tabf2 = "%-16s%8s%8s%10s", "%-16s%8d%8d%10.2f"
+  local hl = rep("-", 42)
+  print(fmt(tabf1, "Lexical",  "Input", "Input", "Input"))
+  print(fmt(tabf1, "Elements", "Count", "Bytes", "Average"))
+  print(hl)
+  for i = 1, #TTYPES do
+    local ttype = TTYPES[i]
+    print(fmt(tabf2, ttype, figures(ttype)))
+    if ttype == "TK_EOS" then print(hl) end
+  end
+  print(hl)
+  print(fmt(tabf2, "Total Elements", figures("TOTAL_ALL")))
+  print(hl)
+  print(fmt(tabf2, "Total Tokens", figures("TOTAL_TOK")))
+  print(hl.."\n")
+end
+
+--- Processes source file(s), writes output and reports some statistics.
+--
+-- @tparam string srcfl Path of the source file.
+-- @tparam string destfl Path of the destination file where to write optimized source.
+local function process_file(srcfl, destfl)
+  -- handle quiet option
+  local function print(...)  --luacheck: ignore 431
+    if option.QUIET then return end
+    _G.print(...)
+  end
+  if plugin and plugin.init then        -- plugin init
+    option.EXIT = false
+    plugin.init(option, srcfl, destfl)
+    if option.EXIT then return end
+  end
+  print(MSG_TITLE)                      -- title message
+
+  -- Load file and process source input into tokens.
+  local z = load_file(srcfl)
+  if plugin and plugin.post_load then   -- plugin post-load
+    z = plugin.post_load(z) or z
+    if option.EXIT then return end
+  end
+  local toklist, seminfolist, toklnlist = llex.lex(z)
+  if plugin and plugin.post_lex then    -- plugin post-lex
+    plugin.post_lex(toklist, seminfolist, toklnlist)
+    if option.EXIT then return end
+  end
+
+  -- Collect 'before' statistics.
+  stat_init()
+  for i = 1, #toklist do
+    local tok, seminfo = toklist[i], seminfolist[i]
+    stat_add(tok, seminfo)
+  end--for
+  local stat1_a = stat_calc()
+  local stat1_c, stat1_l = stat_c, stat_l
+
+  -- Do parser optimization here.
+  optparser.print = print  -- hack
+  local xinfo = lparser.parse(toklist, seminfolist, toklnlist)
+  if plugin and plugin.post_parse then          -- plugin post-parse
+    plugin.post_parse(xinfo.globalinfo, xinfo.localinfo)
+    if option.EXIT then return end
+  end
+  optparser.optimize(option, toklist, seminfolist, xinfo)
+  if plugin and plugin.post_optparse then       -- plugin post-optparse
+    plugin.post_optparse()
+    if option.EXIT then return end
+  end
+
+  -- Do lexer optimization here, save output file.
+  local warn = optlex.warn  -- use this as a general warning lookup
+  optlex.print = print  -- hack
+  toklist, seminfolist, toklnlist
+    = optlex.optimize(option, toklist, seminfolist, toklnlist)
+  if plugin and plugin.post_optlex then         -- plugin post-optlex
+    plugin.post_optlex(toklist, seminfolist, toklnlist)
+    if option.EXIT then return end
+  end
+  local dat = concat(seminfolist)
+  -- Depending on options selected, embedded EOLs in long strings and
+  -- long comments may not have been translated to \n, tack a warning.
+  if find(dat, "\r\n", 1, 1) or
+     find(dat, "\n\r", 1, 1) then
+    warn.MIXEDEOL = true
+  end
+
+  -- Test source and binary chunk equivalence.
+  equiv.init(option, llex, warn)
+  equiv.source(z, dat)
+  if BIN_EQUIV_AVAIL then
+    equiv.binary(z, dat)
+  end
+  local smsg = "before and after lexer streams are NOT equivalent!"
+  local bmsg = "before and after binary chunks are NOT equivalent!"
+  -- for reporting, die if option was selected, else just warn
+  if warn.SRC_EQUIV then
+    if option["opt-srcequiv"] then die(smsg) end
+  else
+    print("*** SRCEQUIV: token streams are sort of equivalent")
+    if option["opt-locals"] then
+      print("(but no identifier comparisons since --opt-locals enabled)")
+    end
+    print()
+  end
+  if warn.BIN_EQUIV then
+    if option["opt-binequiv"] then die(bmsg) end
+  elseif BIN_EQUIV_AVAIL then
+    print("*** BINEQUIV: binary chunks are sort of equivalent")
+    print()
+  end
+
+  -- Save optimized source stream to output file.
+  save_file(destfl, dat)
+
+  -- Collect 'after' statistics.
+  stat_init()
+  for i = 1, #toklist do
+    local tok, seminfo = toklist[i], seminfolist[i]
+    stat_add(tok, seminfo)
+  end--for
+  local stat_a = stat_calc()
+
+  -- Display output.
+  print("Statistics for: "..srcfl.." -> "..destfl.."\n")
+  local function figures(tt)
+    return stat1_c[tt], stat1_l[tt], stat1_a[tt],
+           stat_c[tt],  stat_l[tt],  stat_a[tt]
+  end
+  local tabf1, tabf2 = "%-16s%8s%8s%10s%8s%8s%10s",
+                       "%-16s%8d%8d%10.2f%8d%8d%10.2f"
+  local hl = rep("-", 68)
+  print("*** lexer-based optimizations summary ***\n"..hl)
+  print(fmt(tabf1, "Lexical",
+            "Input", "Input", "Input",
+            "Output", "Output", "Output"))
+  print(fmt(tabf1, "Elements",
+            "Count", "Bytes", "Average",
+            "Count", "Bytes", "Average"))
+  print(hl)
+  for i = 1, #TTYPES do
+    local ttype = TTYPES[i]
+    print(fmt(tabf2, ttype, figures(ttype)))
+    if ttype == "TK_EOS" then print(hl) end
+  end
+  print(hl)
+  print(fmt(tabf2, "Total Elements", figures("TOTAL_ALL")))
+  print(hl)
+  print(fmt(tabf2, "Total Tokens", figures("TOTAL_TOK")))
+  print(hl)
+
+  -- Report warning flags from optimizing process.
+  if warn.LSTRING then
+    print("* WARNING: "..warn.LSTRING)
+  elseif warn.MIXEDEOL then
+    print("* WARNING: ".."output still contains some CRLF or LFCR line endings")
+  elseif warn.SRC_EQUIV then
+    print("* WARNING: "..smsg)
+  elseif warn.BIN_EQUIV then
+    print("* WARNING: "..bmsg)
+  end
+  print()
+end
+
+
+---------------------------- Main functions ---------------------------
+
+local arg = {...}  -- program arguments
+set_options(DEFAULT_CONFIG)     -- set to default options at beginning
+
+--- Does per-file handling, ship off to tasks.
+--
+-- @tparam {string,...} fspec List of source files.
+local function do_files(fspec)
+  for i = 1, #fspec do
+    local srcfl = fspec[i]
+    local destfl
+
+    -- Find and replace extension for filenames.
+    local extb, exte = find(srcfl, "%.[^%.%\\%/]*$")
+    local basename, extension = srcfl, ""
+    if extb and extb > 1 then
+      basename = sub(srcfl, 1, extb - 1)
+      extension = sub(srcfl, extb, exte)
+    end
+    destfl = basename..suffix..extension
+    if #fspec == 1 and option.OUTPUT_FILE then
+      destfl = option.OUTPUT_FILE
+    end
+    if srcfl == destfl then
+      die("output filename identical to input filename")
+    end
+
+    -- Perform requested operations.
+    if option.DUMP_LEXER then
+      dump_tokens(srcfl)
+    elseif option.DUMP_PARSER then
+      dump_parser(srcfl)
+    elseif option.READ_ONLY then
+      read_only(srcfl)
+    else
+      process_file(srcfl, destfl)
+    end
+  end--for
+end
+
+--- The main function.
+local function main()
+  local fspec = {}
+  local argn, i = #arg, 1
+  if argn == 0 then
+    option.HELP = true
+  end
+
+  -- Handle arguments.
+  while i <= argn do
+    local o, p = arg[i], arg[i + 1]
+    local dash = match(o, "^%-%-?")
+    if dash == "-" then                 -- single-dash options
+      if o == "-h" then
+        option.HELP = true; break
+      elseif o == "-v" then
+        option.VERSION = true; break
+      elseif o == "-s" then
+        if not p then die("-s option needs suffix specification") end
+        suffix = p
+        i = i + 1
+      elseif o == "-o" then
+        if not p then die("-o option needs a file name") end
+        option.OUTPUT_FILE = p
+        i = i + 1
+      elseif o == "-" then
+        break -- ignore rest of args
+      else
+        die("unrecognized option "..o)
+      end
+    elseif dash == "--" then            -- double-dash options
+      if o == "--help" then
+        option.HELP = true; break
+      elseif o == "--version" then
+        option.VERSION = true; break
+      elseif o == "--keep" then
+        if not p then die("--keep option needs a string to match for") end
+        option.KEEP = p
+        i = i + 1
+      elseif o == "--plugin" then
+        if not p then die("--plugin option needs a module name") end
+        if option.PLUGIN then die("only one plugin can be specified") end
+        option.PLUGIN = p
+        plugin = require(PLUGIN_SUFFIX..p)
+        i = i + 1
+      elseif o == "--quiet" then
+        option.QUIET = true
+      elseif o == "--read-only" then
+        option.READ_ONLY = true
+      elseif o == "--basic" then
+        set_options(BASIC_CONFIG)
+      elseif o == "--maximum" then
+        set_options(MAXIMUM_CONFIG)
+      elseif o == "--none" then
+        set_options(NONE_CONFIG)
+      elseif o == "--dump-lexer" then
+        option.DUMP_LEXER = true
+      elseif o == "--dump-parser" then
+        option.DUMP_PARSER = true
+      elseif o == "--details" then
+        option.DETAILS = true
+      elseif OPTION[o] then  -- lookup optimization options
+        set_options(o)
+      else
+        die("unrecognized option "..o)
+      end
+    else
+      fspec[#fspec + 1] = o             -- potential filename
+    end
+    i = i + 1
+  end--while
+  if option.HELP then
+    print(MSG_TITLE..MSG_USAGE); return true
+  elseif option.VERSION then
+    print(MSG_TITLE); return true
+  end
+  if option["opt-binequiv"] and not BIN_EQUIV_AVAIL then
+    die("--opt-binequiv is available only for PUC Lua 5.1!")
+  end
+  if #fspec > 0 then
+    if #fspec > 1 and option.OUTPUT_FILE then
+      die("with -o, only one source file can be specified")
+    end
+    do_files(fspec)
+    return true
+  else
+    die("nothing to do!")
+  end
+end
+
+-- entry point -> main() -> do_files()
+if not main() then
+  die("Please run with option -h or --help for usage information")
+end

tools/initialDietFlash.sh

@@ -0,0 +1,106 @@
+#!/bin/bash
+
+TOOLDIR=tools/
+LUATOOL=${TOOLDIR}luatool.py
+
+#DIET=bin/luasrcdiet --maximum
+DIET=bin/luasrcdiet
+
+DEVICE=$1
+BAUD=115200
+
+LUASCRIPT_STOP=${TOOLDIR}/stopController.lua
+
+# check environment
+if [ ! -f $LUATOOL ]; then
+ echo "$LUATOOL not found"
+ echo "is the command prompt at the same level as the tools folder ?"
+ exit 1
+fi
+
+# check the serial connection
+
+if [ ! -c $DEVICE ]; then
+ echo "Serial target: $DEVICE does not exist"
+ exit 1
+fi
+
+if [ $# -eq 0 ]; then
+    echo ""
+    echo "e.g. usage $0 <device> [<files to upoad>]"
+    exit 1
+fi
+
+if [ $# -eq 1 ]; then
+	FILES="displayword.lua main.lua timecore.lua webpage.html webserver.lua telnet.lua wordclock.lua init.lua"
+else
+	FILES=$2
+fi
+
+# Convert files, if necessary
+if [ "$FILES" != "config.lua" ]; then
+	echo "Generate DIET version of the files"
+	OUTFILES=""
+	ROOTDIR=$PWD
+	cd $TOOLDIR
+	for f in $FILES; do
+		if [[ "$f" == *.lua ]] && [[ "$f" != init.lua ]]; then
+			echo "Compress $f ..."
+			out=$(echo "$f" | sed 's/.lua/_diet.lua/g')
+			$DIET ../$f -o ../diet/$out
+			if [ $? -ne 0 ]; then
+				echo "Failed to generate file"
+				exit $?
+			fi
+			OUTFILES="$OUTFILES diet/$out"
+		else
+			OUTFILES="$OUTFILES $f"
+		fi
+	done
+	FILES=$OUTFILES
+	cd $ROOTDIR
+fi
+echo "Reboot ESP and stop init timer"
+if [ ! -f $LUASCRIPT_STOP ]; then
+	echo "Cannot find $LUASCRIPT_STOP"
+	exit 1
+fi
+python3 $LUATOOL -p $DEVICE -f $LUASCRIPT_STOP -b $BAUD --volatile --delay 2
+if [ $? -ne 0 ]; then
+   echo "Could not reboot"
+   exit 1
+fi
+
+if [ $# -eq 1 ]; then
+	# Format filesystem first
+	echo "Format the complete ESP"
+	python3 $LUATOOL -p $DEVICE -w -b $BAUD
+	if [ $? -ne 0 ]; then
+	    echo "STOOOOP"
+	    exit 1
+	fi
+fi
+
+echo "Start Flasing ..."
+for f in $FILES; do
+    if [ ! -f $f ]; then
+        echo "Cannot find $f"
+        echo "place the terminal into the folder where the lua files are present"
+        exit 1
+    fi
+
+    espFile=$(echo "$f" | sed 's;diet/;;g')
+    echo "------------- $espFile ------------"
+    python3 $LUATOOL -p $DEVICE -f $f -b $BAUD -t $espFile
+    if [ $? -ne 0 ]; then
+        echo "STOOOOP"
+        exit 1
+    fi
+done
+
+if [ $# -eq 1 ]; then
+	echo "Reboot the ESP"
+	echo "node.restart()" >> $DEVICE
+fi
+
+exit 0

tools/luasrcdiet/equiv.lua

@@ -0,0 +1,465 @@
+---------
+-- Source and binary equivalency comparisons
+--
+-- **Notes:**
+--
+-- * Intended as an extra safety check for mission-critical code,
+--   should give affirmative results if everything works.
+-- * Heavy on load() and string.dump(), which may be slowish,
+--   and may cause problems for cross-compiled applications.
+-- * Optional detailed information dump is mainly for debugging,
+--   reason being, if the two are not equivalent when they should be,
+--   then some form of optimization has failed.
+-- * source: IMPORTANT: TK_NAME not compared if opt-locals enabled.
+-- * binary: IMPORTANT: Some shortcuts are taken with int and size_t
+--   value reading -- if the functions break, then the binary chunk
+--   is very large indeed.
+-- * binary: There is a lack of diagnostic information when a compare
+--   fails; you can use ChunkSpy and compare using visual diff.
+----
+local byte = string.byte
+local dump = string.dump
+local load = loadstring or load  --luacheck: ignore 113
+local sub = string.sub
+
+local M = {}
+
+local is_realtoken = {          -- significant (grammar) tokens
+  TK_KEYWORD = true,
+  TK_NAME = true,
+  TK_NUMBER = true,
+  TK_STRING = true,
+  TK_LSTRING = true,
+  TK_OP = true,
+  TK_EOS = true,
+}
+
+local option, llex, warn
+
+
+--- The initialization function.
+--
+-- @tparam {[string]=bool,...} _option
+-- @tparam luasrcdiet.llex _llex
+-- @tparam table _warn
+function M.init(_option, _llex, _warn)
+  option = _option
+  llex = _llex
+  warn = _warn
+end
+
+--- Builds lists containing a 'normal' lexer stream.
+--
+-- @tparam string s The source code.
+-- @treturn table
+-- @treturn table
+local function build_stream(s)
+  local stok, sseminfo = llex.lex(s) -- source list (with whitespace elements)
+  local tok, seminfo   -- processed list (real elements only)
+    = {}, {}
+  for i = 1, #stok do
+    local t = stok[i]
+    if is_realtoken[t] then
+      tok[#tok + 1] = t
+      seminfo[#seminfo + 1] = sseminfo[i]
+    end
+  end--for
+  return tok, seminfo
+end
+
+-- Tests source (lexer stream) equivalence.
+--
+-- @tparam string z
+-- @tparam string dat
+function M.source(z, dat)
+
+  -- Returns a dumped string for seminfo compares.
+  local function dumpsem(s)
+    local sf = load("return "..s, "z")
+    if sf then
+      return dump(sf)
+    end
+  end
+
+  -- Marks and optionally reports non-equivalence.
+  local function bork(msg)
+    if option.DETAILS then print("SRCEQUIV: "..msg) end
+    warn.SRC_EQUIV = true
+  end
+
+  -- Get lexer streams for both source strings, compare.
+  local tok1, seminfo1 = build_stream(z)        -- original
+  local tok2, seminfo2 = build_stream(dat)      -- compressed
+
+  -- Compare shbang lines ignoring EOL.
+  local sh1 = z:match("^(#[^\r\n]*)")
+  local sh2 = dat:match("^(#[^\r\n]*)")
+  if sh1 or sh2 then
+    if not sh1 or not sh2 or sh1 ~= sh2 then
+      bork("shbang lines different")
+    end
+  end
+
+  -- Compare by simple count.
+  if #tok1 ~= #tok2 then
+    bork("count "..#tok1.." "..#tok2)
+    return
+  end
+
+  -- Compare each element the best we can.
+  for i = 1, #tok1 do
+    local t1, t2 = tok1[i], tok2[i]
+    local s1, s2 = seminfo1[i], seminfo2[i]
+    if t1 ~= t2 then  -- by type
+      bork("type ["..i.."] "..t1.." "..t2)
+      break
+    end
+    if t1 == "TK_KEYWORD" or t1 == "TK_NAME" or t1 == "TK_OP" then
+      if t1 == "TK_NAME" and option["opt-locals"] then
+        -- can't compare identifiers of locals that are optimized
+      elseif s1 ~= s2 then  -- by semantic info (simple)
+        bork("seminfo ["..i.."] "..t1.." "..s1.." "..s2)
+        break
+      end
+    elseif t1 == "TK_EOS" then
+      -- no seminfo to compare
+    else-- "TK_NUMBER" or "TK_STRING" or "TK_LSTRING"
+      -- compare 'binary' form, so dump a function
+      local s1b,s2b = dumpsem(s1), dumpsem(s2)
+      if not s1b or not s2b or s1b ~= s2b then
+        bork("seminfo ["..i.."] "..t1.." "..s1.." "..s2)
+        break
+      end
+    end
+  end--for
+
+  -- Successful comparison if end is reached with no borks.
+end
+
+--- Tests binary chunk equivalence (only for PUC Lua 5.1).
+--
+-- @tparam string z
+-- @tparam string dat
+function M.binary(z, dat)
+  local TNIL     = 0  --luacheck: ignore 211
+  local TBOOLEAN = 1
+  local TNUMBER  = 3
+  local TSTRING  = 4
+
+  -- sizes of data types
+  local endian
+  local sz_int
+  local sz_sizet
+  local sz_inst
+  local sz_number
+  local getint
+  local getsizet
+
+  -- Marks and optionally reports non-equivalence.
+  local function bork(msg)
+    if option.DETAILS then print("BINEQUIV: "..msg) end
+    warn.BIN_EQUIV = true
+  end
+
+  -- Checks if bytes exist.
+  local function ensure(c, sz)
+    if c.i + sz - 1 > c.len then return end
+    return true
+  end
+
+  -- Skips some bytes.
+  local function skip(c, sz)
+    if not sz then sz = 1 end
+    c.i = c.i + sz
+  end
+
+  -- Returns a byte value.
+  local function getbyte(c)
+    local i = c.i
+    if i > c.len then return end
+    local d = sub(c.dat, i, i)
+    c.i = i + 1
+    return byte(d)
+  end
+
+  -- Return an int value (little-endian).
+  local function getint_l(c)
+    local n, scale = 0, 1
+    if not ensure(c, sz_int) then return end
+    for _ = 1, sz_int do
+      n = n + scale * getbyte(c)
+      scale = scale * 256
+    end
+    return n
+  end
+
+  -- Returns an int value (big-endian).
+  local function getint_b(c)
+    local n = 0
+    if not ensure(c, sz_int) then return end
+    for _ = 1, sz_int do
+      n = n * 256 + getbyte(c)
+    end
+    return n
+  end
+
+  -- Returns a size_t value (little-endian).
+  local function getsizet_l(c)
+    local n, scale = 0, 1
+    if not ensure(c, sz_sizet) then return end
+    for _ = 1, sz_sizet do
+      n = n + scale * getbyte(c)
+      scale = scale * 256
+    end
+    return n
+  end
+
+  -- Returns a size_t value (big-endian).
+  local function getsizet_b(c)
+    local n = 0
+    if not ensure(c, sz_sizet) then return end
+    for _ = 1, sz_sizet do
+      n = n * 256 + getbyte(c)
+    end
+    return n
+  end
+
+  -- Returns a block (as a string).
+  local function getblock(c, sz)
+    local i = c.i
+    local j = i + sz - 1
+    if j > c.len then return end
+    local d = sub(c.dat, i, j)
+    c.i = i + sz
+    return d
+  end
+
+  -- Returns a string.
+  local function getstring(c)
+    local n = getsizet(c)
+    if not n then return end
+    if n == 0 then return "" end
+    return getblock(c, n)
+  end
+
+  -- Compares byte value.
+  local function goodbyte(c1, c2)
+    local b1, b2 = getbyte(c1), getbyte(c2)
+    if not b1 or not b2 or b1 ~= b2 then
+      return
+    end
+    return b1
+  end
+
+  -- Compares byte value.
+  local function badbyte(c1, c2)
+    local b = goodbyte(c1, c2)
+    if not b then return true end
+  end
+
+  -- Compares int value.
+  local function goodint(c1, c2)
+    local i1, i2 = getint(c1), getint(c2)
+    if not i1 or not i2 or i1 ~= i2 then
+      return
+    end
+    return i1
+  end
+
+  -- Recursively-called function to compare function prototypes.
+  local function getfunc(c1, c2)
+    -- source name (ignored)
+    if not getstring(c1) or not getstring(c2) then
+      bork("bad source name"); return
+    end
+    -- linedefined (ignored)
+    if not getint(c1) or not getint(c2) then
+      bork("bad linedefined"); return
+    end
+    -- lastlinedefined (ignored)
+    if not getint(c1) or not getint(c2) then
+      bork("bad lastlinedefined"); return
+    end
+    if not (ensure(c1, 4) and ensure(c2, 4)) then
+      bork("prototype header broken")
+    end
+    -- nups (compared)
+    if badbyte(c1, c2) then
+      bork("bad nups"); return
+    end
+    -- numparams (compared)
+    if badbyte(c1, c2) then
+      bork("bad numparams"); return
+    end
+    -- is_vararg (compared)
+    if badbyte(c1, c2) then
+      bork("bad is_vararg"); return
+    end
+    -- maxstacksize (compared)
+    if badbyte(c1, c2) then
+      bork("bad maxstacksize"); return
+    end
+    -- code (compared)
+    local ncode = goodint(c1, c2)
+    if not ncode then
+      bork("bad ncode"); return
+    end
+    local code1 = getblock(c1, ncode * sz_inst)
+    local code2 = getblock(c2, ncode * sz_inst)
+    if not code1 or not code2 or code1 ~= code2 then
+      bork("bad code block"); return
+    end
+    -- constants (compared)
+    local nconst = goodint(c1, c2)
+    if not nconst then
+      bork("bad nconst"); return
+    end
+    for _ = 1, nconst do
+      local ctype = goodbyte(c1, c2)
+      if not ctype then
+        bork("bad const type"); return
+      end
+      if ctype == TBOOLEAN then
+        if badbyte(c1, c2) then
+          bork("bad boolean value"); return
+        end
+      elseif ctype == TNUMBER then
+        local num1 = getblock(c1, sz_number)
+        local num2 = getblock(c2, sz_number)
+        if not num1 or not num2 or num1 ~= num2 then
+          bork("bad number value"); return
+        end
+      elseif ctype == TSTRING then
+        local str1 = getstring(c1)
+        local str2 = getstring(c2)
+        if not str1 or not str2 or str1 ~= str2 then
+          bork("bad string value"); return
+        end
+      end
+    end
+    -- prototypes (compared recursively)
+    local nproto = goodint(c1, c2)
+    if not nproto then
+      bork("bad nproto"); return
+    end
+    for _ = 1, nproto do
+      if not getfunc(c1, c2) then
+        bork("bad function prototype"); return
+      end
+    end
+    -- debug information (ignored)
+    -- lineinfo (ignored)
+    local sizelineinfo1 = getint(c1)
+    if not sizelineinfo1 then
+      bork("bad sizelineinfo1"); return
+    end
+    local sizelineinfo2 = getint(c2)
+    if not sizelineinfo2 then
+      bork("bad sizelineinfo2"); return
+    end
+    if not getblock(c1, sizelineinfo1 * sz_int) then
+      bork("bad lineinfo1"); return
+    end
+    if not getblock(c2, sizelineinfo2 * sz_int) then
+      bork("bad lineinfo2"); return
+    end
+    -- locvars (ignored)
+    local sizelocvars1 = getint(c1)
+    if not sizelocvars1 then
+      bork("bad sizelocvars1"); return
+    end
+    local sizelocvars2 = getint(c2)
+    if not sizelocvars2 then
+      bork("bad sizelocvars2"); return
+    end
+    for _ = 1, sizelocvars1 do
+      if not getstring(c1) or not getint(c1) or not getint(c1) then
+        bork("bad locvars1"); return
+      end
+    end
+    for _ = 1, sizelocvars2 do
+      if not getstring(c2) or not getint(c2) or not getint(c2) then
+        bork("bad locvars2"); return
+      end
+    end
+    -- upvalues (ignored)
+    local sizeupvalues1 = getint(c1)
+    if not sizeupvalues1 then
+      bork("bad sizeupvalues1"); return
+    end
+    local sizeupvalues2 = getint(c2)
+    if not sizeupvalues2 then
+      bork("bad sizeupvalues2"); return
+    end
+    for _ = 1, sizeupvalues1 do
+      if not getstring(c1) then bork("bad upvalues1"); return end
+    end
+    for _ = 1, sizeupvalues2 do
+      if not getstring(c2) then bork("bad upvalues2"); return end
+    end
+    return true
+  end
+
+  -- Removes shbang line so that load runs.
+  local function zap_shbang(s)
+    local shbang = s:match("^(#[^\r\n]*\r?\n?)")
+    if shbang then                      -- cut out shbang
+      s = sub(s, #shbang + 1)
+    end
+    return s
+  end
+
+  -- Attempt to compile, then dump to get binary chunk string.
+  local cz = load(zap_shbang(z), "z")
+  if not cz then
+    bork("failed to compile original sources for binary chunk comparison")
+    return
+  end
+
+  local cdat = load(zap_shbang(dat), "z")
+  if not cdat then
+    bork("failed to compile compressed result for binary chunk comparison")
+  end
+
+  -- if load() works, dump assuming string.dump() is error-free
+  local c1 = { i = 1, dat = dump(cz) }
+  c1.len = #c1.dat
+
+  local c2 = { i = 1, dat = dump(cdat) }
+  c2.len = #c2.dat
+
+  -- Parse binary chunks to verify equivalence.
+  -- * For headers, handle sizes to allow a degree of flexibility.
+  -- * Assume a valid binary chunk is generated, since it was not
+  --   generated via external means.
+  if not (ensure(c1, 12) and ensure(c2, 12)) then
+    bork("header broken")
+  end
+  skip(c1, 6)                   -- skip signature(4), version, format
+  endian    = getbyte(c1)       -- 1 = little endian
+  sz_int    = getbyte(c1)       -- get data type sizes
+  sz_sizet  = getbyte(c1)
+  sz_inst   = getbyte(c1)
+  sz_number = getbyte(c1)
+  skip(c1)                      -- skip integral flag
+  skip(c2, 12)                  -- skip other header (assume similar)
+
+  if endian == 1 then           -- set for endian sensitive data we need
+    getint   = getint_l
+    getsizet = getsizet_l
+  else
+    getint   = getint_b
+    getsizet = getsizet_b
+  end
+  getfunc(c1, c2)               -- get prototype at root
+
+  if c1.i ~= c1.len + 1 then
+    bork("inconsistent binary chunk1"); return
+  elseif c2.i ~= c2.len + 1 then
+    bork("inconsistent binary chunk2"); return
+  end
+
+  -- Successful comparison if end is reached with no borks.
+end
+
+return M

tools/luasrcdiet/fs.lua

@@ -0,0 +1,74 @@
+---------
+-- Utility functions for operations on a file system.
+--
+-- **Note: This module is not part of public API!**
+----
+local fmt = string.format
+local open = io.open
+
+local UTF8_BOM = '\239\187\191'
+
+local function normalize_io_error (name, err)
+  if err:sub(1, #name + 2) == name..': ' then
+    err = err:sub(#name + 3)
+  end
+  return err
+end
+
+local M = {}
+
+--- Reads the specified file and returns its content as string.
+--
+-- @tparam string filename Path of the file to read.
+-- @tparam string mode The mode in which to open the file, see @{io.open} (default: "r").
+-- @treturn[1] string A content of the file.
+-- @treturn[2] nil
+-- @treturn[2] string An error message.
+function M.read_file (filename, mode)
+  local handler, err = open(filename, mode or 'r')
+  if not handler then
+    return nil, fmt('Could not open %s for reading: %s',
+                    filename, normalize_io_error(filename, err))
+  end
+
+  local content, err = handler:read('*a')  --luacheck: ignore 411
+  if not content then
+    return nil, fmt('Could not read %s: %s', filename, normalize_io_error(filename, err))
+  end
+
+  handler:close()
+
+  if content:sub(1, #UTF8_BOM) == UTF8_BOM then
+    content = content:sub(#UTF8_BOM + 1)
+  end
+
+  return content
+end
+
+--- Writes the given data to the specified file.
+--
+-- @tparam string filename Path of the file to write.
+-- @tparam string data The data to write.
+-- @tparam ?string mode The mode in which to open the file, see @{io.open} (default: "w").
+-- @treturn[1] true
+-- @treturn[2] nil
+-- @treturn[2] string An error message.
+function M.write_file (filename, data, mode)
+  local handler, err = open(filename, mode or 'w')
+  if not handler then
+    return nil, fmt('Could not open %s for writing: %s',
+                    filename, normalize_io_error(filename, err))
+  end
+
+  local _, err = handler:write(data)  --luacheck: ignore 411
+  if err then
+    return nil, fmt('Could not write %s: %s', filename, normalize_io_error(filename, err))
+  end
+
+  handler:flush()
+  handler:close()
+
+  return true
+end
+
+return M

tools/luasrcdiet/init.lua

@@ -0,0 +1,117 @@
+---------
+-- LuaSrcDiet API
+----
+local equiv = require 'luasrcdiet.equiv'
+local llex = require 'luasrcdiet.llex'
+local lparser = require 'luasrcdiet.lparser'
+local optlex = require 'luasrcdiet.optlex'
+local optparser = require 'luasrcdiet.optparser'
+local utils = require 'luasrcdiet.utils'
+
+local concat = table.concat
+local merge = utils.merge
+
+local _  -- placeholder
+
+
+local function noop ()
+  return
+end
+
+local function opts_to_legacy (opts)
+  local res = {}
+  for key, val in pairs(opts) do
+    res['opt-'..key] = val
+  end
+  return res
+end
+
+
+local M = {}
+
+--- The module's name.
+M._NAME = 'luasrcdiet'
+
+--- The module's version number.
+M._VERSION = '1.0.0'
+
+--- The module's homepage.
+M._HOMEPAGE = 'https://github.com/jirutka/luasrcdiet'
+
+--- All optimizations disabled.
+M.NONE_OPTS = {
+  binequiv = false,
+  comments = false,
+  emptylines = false,
+  entropy = false,
+  eols = false,
+  experimental = false,
+  locals = false,
+  numbers = false,
+  srcequiv = false,
+  strings = false,
+  whitespace = false,
+}
+
+--- Basic optimizations enabled.
+-- @table BASIC_OPTS
+M.BASIC_OPTS = merge(M.NONE_OPTS, {
+  comments = true,
+  emptylines = true,
+  srcequiv = true,
+  whitespace = true,
+})
+
+--- Defaults.
+-- @table DEFAULT_OPTS
+M.DEFAULT_OPTS = merge(M.BASIC_OPTS, {
+  locals = true,
+  numbers = true,
+})
+
+--- Maximum optimizations enabled (all except experimental).
+-- @table MAXIMUM_OPTS
+M.MAXIMUM_OPTS = merge(M.DEFAULT_OPTS, {
+  entropy = true,
+  eols = true,
+  strings = true,
+})
+
+--- Optimizes the given Lua source code.
+--
+-- @tparam ?{[string]=bool,...} opts Optimizations to do (default is @{DEFAULT_OPTS}).
+-- @tparam string source The Lua source code to optimize.
+-- @treturn string Optimized source.
+-- @raise if the source is malformed, source equivalence test failed, or some
+--   other error occured.
+function M.optimize (opts, source)
+  assert(source and type(source) == 'string',
+         'bad argument #2: expected string, got a '..type(source))
+
+  opts = opts and merge(M.NONE_OPTS, opts) or M.DEFAULT_OPTS
+  local legacy_opts = opts_to_legacy(opts)
+
+  local toklist, seminfolist, toklnlist = llex.lex(source)
+  local xinfo = lparser.parse(toklist, seminfolist, toklnlist)
+
+  optparser.print = noop
+  optparser.optimize(legacy_opts, toklist, seminfolist, xinfo)
+
+  local warn = optlex.warn  -- use this as a general warning lookup
+  optlex.print = noop
+  _, seminfolist = optlex.optimize(legacy_opts, toklist, seminfolist, toklnlist)
+  local optim_source = concat(seminfolist)
+
+  if opts.srcequiv and not opts.experimental then
+    equiv.init(legacy_opts, llex, warn)
+    equiv.source(source, optim_source)
+
+    if warn.SRC_EQUIV then
+      error('Source equivalence test failed!')
+    end
+  end
+
+  return optim_source
+end
+
+return M

tools/luasrcdiet/llex.lua

@@ -0,0 +1,350 @@
+---------
+-- Lua 5.1+ lexical analyzer written in Lua.
+--
+-- This file is part of LuaSrcDiet, based on Yueliang material.
+--
+-- **Notes:**
+--
+-- * This is a version of the native 5.1.x lexer from Yueliang 0.4.0,
+--   with significant modifications to handle LuaSrcDiet's needs:
+--   (1) llex.error is an optional error function handler,
+--   (2) seminfo for strings include their delimiters and no
+--       translation operations are performed on them.
+-- * ADDED shbang handling has been added to support executable scripts.
+-- * NO localized decimal point replacement magic.
+-- * NO limit to number of lines.
+-- * NO support for compatible long strings (LUA\_COMPAT_LSTR).
+-- * Added goto keyword and double-colon operator (Lua 5.2+).
+----
+local find = string.find
+local fmt = string.format
+local match = string.match
+local sub = string.sub
+local tonumber = tonumber
+
+local M = {}
+
+local kw = {}
+for v in ([[
+and break do else elseif end false for function goto if in
+local nil not or repeat return then true until while]]):gmatch("%S+") do
+  kw[v] = true
+end
+
+local z,                -- source stream
+      sourceid,         -- name of source
+      I,                -- position of lexer
+      buff,             -- buffer for strings
+      ln,               -- line number
+      tok,              -- lexed token list
+      seminfo,          -- lexed semantic information list
+      tokln             -- line numbers for messages
+
+
+--- Adds information to token listing.
+--
+-- @tparam string token
+-- @tparam string info
+local function addtoken(token, info)
+  local i = #tok + 1
+  tok[i] = token
+  seminfo[i] = info
+  tokln[i] = ln
+end
+
+--- Handles line number incrementation and end-of-line characters.
+--
+-- @tparam int i Position of lexer in the source stream.
+-- @tparam bool is_tok
+-- @treturn int
+local function inclinenumber(i, is_tok)
+  local old = sub(z, i, i)
+  i = i + 1  -- skip '\n' or '\r'
+  local c = sub(z, i, i)
+  if (c == "\n" or c == "\r") and (c ~= old) then
+    i = i + 1  -- skip '\n\r' or '\r\n'
+    old = old..c
+  end
+  if is_tok then addtoken("TK_EOL", old) end
+  ln = ln + 1
+  I = i
+  return i
+end
+
+--- Returns a chunk name or id, no truncation for long names.
+--
+-- @treturn string
+local function chunkid()
+  if sourceid and match(sourceid, "^[=@]") then
+    return sub(sourceid, 2)  -- remove first char
+  end
+  return "[string]"
+end
+
+--- Formats error message and throws error.
+--
+-- A simplified version, does not report what token was responsible.
+--
+-- @tparam string s
+-- @tparam int line The line number.
+-- @raise
+local function errorline(s, line)
+  local e = M.error or error
+  e(fmt("%s:%d: %s", chunkid(), line or ln, s))
+end
+
+--- Counts separators (`="` in a long string delimiter.
+--
+-- @tparam int i Position of lexer in the source stream.
+-- @treturn int
+local function skip_sep(i)
+  local s = sub(z, i, i)
+  i = i + 1
+  local count = #match(z, "=*", i)
+  i = i + count
+  I = i
+  return (sub(z, i, i) == s) and count or (-count) - 1
+end
+
+--- Reads a long string or long comment.
+--
+-- @tparam bool is_str
+-- @tparam string sep
+-- @treturn string
+-- @raise if unfinished long string or comment.
+local function read_long_string(is_str, sep)
+  local i = I + 1  -- skip 2nd '['
+  local c = sub(z, i, i)
+  if c == "\r" or c == "\n" then  -- string starts with a newline?
+    i = inclinenumber(i)  -- skip it
+  end
+  while true do
+    local p, _, r = find(z, "([\r\n%]])", i) -- (long range match)
+    if not p then
+      errorline(is_str and "unfinished long string" or
+                "unfinished long comment")
+    end
+    i = p
+    if r == "]" then                    -- delimiter test
+      if skip_sep(i) == sep then
+        buff = sub(z, buff, I)
+        I = I + 1  -- skip 2nd ']'
+        return buff
+      end
+      i = I
+    else                                -- newline
+      buff = buff.."\n"
+      i = inclinenumber(i)
+    end
+  end--while
+end
+
+--- Reads a string.
+--
+-- @tparam string del The delimiter.
+-- @treturn string
+-- @raise if unfinished string or too large escape sequence.
+local function read_string(del)
+  local i = I
+  while true do
+    local p, _, r = find(z, "([\n\r\\\"\'])", i) -- (long range match)
+    if p then
+      if r == "\n" or r == "\r" then
+        errorline("unfinished string")
+      end
+      i = p
+      if r == "\\" then                         -- handle escapes
+        i = i + 1
+        r = sub(z, i, i)
+        if r == "" then break end -- (EOZ error)
+        p = find("abfnrtv\n\r", r, 1, true)
+
+        if p then                               -- special escapes
+          if p > 7 then
+            i = inclinenumber(i)
+          else
+            i = i + 1
+          end
+
+        elseif find(r, "%D") then               -- other non-digits
+          i = i + 1
+
+        else                                    -- \xxx sequence
+          local _, q, s = find(z, "^(%d%d?%d?)", i)
+          i = q + 1
+          if s + 1 > 256 then -- UCHAR_MAX
+            errorline("escape sequence too large")
+          end
+
+        end--if p
+      else
+        i = i + 1
+        if r == del then                        -- ending delimiter
+          I = i
+          return sub(z, buff, i - 1)            -- return string
+        end
+      end--if r
+    else
+      break -- (error)
+    end--if p
+  end--while
+  errorline("unfinished string")
+end
+
+
+--- Initializes lexer for given source _z and source name _sourceid.
+--
+-- @tparam string _z The source code.
+-- @tparam string _sourceid Name of the source.
+local function init(_z, _sourceid)
+  z = _z                        -- source
+  sourceid = _sourceid          -- name of source
+  I = 1                         -- lexer's position in source
+  ln = 1                        -- line number
+  tok = {}                      -- lexed token list*
+  seminfo = {}                  -- lexed semantic information list*
+  tokln = {}                    -- line numbers for messages*
+
+  -- Initial processing (shbang handling).
+  local p, _, q, r = find(z, "^(#[^\r\n]*)(\r?\n?)")
+  if p then                             -- skip first line
+    I = I + #q
+    addtoken("TK_COMMENT", q)
+    if #r > 0 then inclinenumber(I, true) end
+  end
+end
+
+--- Runs lexer on the given source code.
+--
+-- @tparam string source The Lua source to scan.
+-- @tparam ?string source_name Name of the source (optional).
+-- @treturn {string,...} A list of lexed tokens.
+-- @treturn {string,...} A list of semantic information (lexed strings).
+-- @treturn {int,...} A list of line numbers.
+function M.lex(source, source_name)
+  init(source, source_name)
+
+  while true do--outer
+    local i = I
+    -- inner loop allows break to be used to nicely section tests
+    while true do --luacheck: ignore 512
+
+      local p, _, r = find(z, "^([_%a][_%w]*)", i)
+      if p then
+        I = i + #r
+        if kw[r] then
+          addtoken("TK_KEYWORD", r)             -- reserved word (keyword)
+        else
+          addtoken("TK_NAME", r)                -- identifier
+        end
+        break -- (continue)
+      end
+
+      local p, _, r = find(z, "^(%.?)%d", i)
+      if p then                                 -- numeral
+        if r == "." then i = i + 1 end
+        local _, q, r = find(z, "^%d*[%.%d]*([eE]?)", i)  --luacheck: ignore 421
+        i = q + 1
+        if #r == 1 then                         -- optional exponent
+          if match(z, "^[%+%-]", i) then        -- optional sign
+            i = i + 1
+          end
+        end
+        local _, q = find(z, "^[_%w]*", i)
+        I = q + 1
+        local v = sub(z, p, q)                  -- string equivalent
+        if not tonumber(v) then            -- handles hex test also
+          errorline("malformed number")
+        end
+        addtoken("TK_NUMBER", v)
+        break -- (continue)
+      end
+
+      local p, q, r, t = find(z, "^((%s)[ \t\v\f]*)", i)
+      if p then
+        if t == "\n" or t == "\r" then          -- newline
+          inclinenumber(i, true)
+        else
+          I = q + 1                             -- whitespace
+          addtoken("TK_SPACE", r)
+        end
+        break -- (continue)
+      end
+
+      local _, q = find(z, "^::", i)
+      if q then
+        I = q + 1
+        addtoken("TK_OP", "::")
+        break -- (continue)
+      end
+
+      local r = match(z, "^%p", i)
+      if r then
+        buff = i
+        local p = find("-[\"\'.=<>~", r, 1, true)  --luacheck: ignore 421
+        if p then
+
+          -- two-level if block for punctuation/symbols
+          if p <= 2 then
+            if p == 1 then                      -- minus
+              local c = match(z, "^%-%-(%[?)", i)
+              if c then
+                i = i + 2
+                local sep = -1
+                if c == "[" then
+                  sep = skip_sep(i)
+                end
+                if sep >= 0 then                -- long comment
+                  addtoken("TK_LCOMMENT", read_long_string(false, sep))
+                else                            -- short comment
+                  I = find(z, "[\n\r]", i) or (#z + 1)
+                  addtoken("TK_COMMENT", sub(z, buff, I - 1))
+                end
+                break -- (continue)
+              end
+              -- (fall through for "-")
+            else                                -- [ or long string
+              local sep = skip_sep(i)
+              if sep >= 0 then
+                addtoken("TK_LSTRING", read_long_string(true, sep))
+              elseif sep == -1 then
+                addtoken("TK_OP", "[")
+              else
+                errorline("invalid long string delimiter")
+              end
+              break -- (continue)
+            end
+
+          elseif p <= 5 then
+            if p < 5 then                       -- strings
+              I = i + 1
+              addtoken("TK_STRING", read_string(r))
+              break -- (continue)
+            end
+            r = match(z, "^%.%.?%.?", i)        -- .|..|... dots
+            -- (fall through)
+
+          else                                  -- relational
+            r = match(z, "^%p=?", i)
+            -- (fall through)
+          end
+        end
+        I = i + #r
+        addtoken("TK_OP", r)  -- for other symbols, fall through
+        break -- (continue)
+      end
+
+      local r = sub(z, i, i)
+      if r ~= "" then
+        I = i + 1
+        addtoken("TK_OP", r)                    -- other single-char tokens
+        break
+      end
+      addtoken("TK_EOS", "")                    -- end of stream,
+      return tok, seminfo, tokln                -- exit here
+
+    end--while inner
+  end--while outer
+end
+
+return M

tools/luasrcdiet/optlex.lua

@@ -0,0 +1,852 @@
+---------
+-- This module does lexer-based optimizations.
+--
+-- **Notes:**
+--
+-- * TODO: General string delimiter conversion optimizer.
+-- * TODO: (numbers) warn if overly significant digit.
+----
+local char = string.char
+local find = string.find
+local match = string.match
+local rep = string.rep
+local sub = string.sub
+local tonumber = tonumber
+local tostring = tostring
+
+local print                     -- set in optimize()
+
+local M = {}
+
+-- error function, can override by setting own function into module
+M.error = error
+
+M.warn = {}                       -- table for warning flags
+
+local stoks, sinfos, stoklns    -- source lists
+
+local is_realtoken = {          -- significant (grammar) tokens
+  TK_KEYWORD = true,
+  TK_NAME = true,
+  TK_NUMBER = true,
+  TK_STRING = true,
+  TK_LSTRING = true,
+  TK_OP = true,
+  TK_EOS = true,
+}
+local is_faketoken = {          -- whitespace (non-grammar) tokens
+  TK_COMMENT = true,
+  TK_LCOMMENT = true,
+  TK_EOL = true,
+  TK_SPACE = true,
+}
+
+local opt_details               -- for extra information
+
+--- Returns true if current token is at the start of a line.
+--
+-- It skips over deleted tokens via recursion.
+--
+-- @tparam int i
+-- @treturn bool
+local function atlinestart(i)
+  local tok = stoks[i - 1]
+  if i <= 1 or tok == "TK_EOL" then
+    return true
+  elseif tok == "" then
+    return atlinestart(i - 1)
+  end
+  return false
+end
+
+--- Returns true if current token is at the end of a line.
+--
+-- It skips over deleted tokens via recursion.
+--
+-- @tparam int i
+-- @treturn bool
+local function atlineend(i)
+  local tok = stoks[i + 1]
+  if i >= #stoks or tok == "TK_EOL" or tok == "TK_EOS" then
+    return true
+  elseif tok == "" then
+    return atlineend(i + 1)
+  end
+  return false
+end
+
+--- Counts comment EOLs inside a long comment.
+--
+-- In order to keep line numbering, EOLs need to be reinserted.
+--
+-- @tparam string lcomment
+-- @treturn int
+local function commenteols(lcomment)
+  local sep = #match(lcomment, "^%-%-%[=*%[")
+  local z = sub(lcomment, sep + 1, -(sep - 1))  -- remove delims
+  local i, c = 1, 0
+  while true do
+    local p, _, r, s = find(z, "([\r\n])([\r\n]?)", i)
+    if not p then break end     -- if no matches, done
+    i = p + 1
+    c = c + 1
+    if #s > 0 and r ~= s then   -- skip CRLF or LFCR
+      i = i + 1
+    end
+  end
+  return c
+end
+
+--- Compares two tokens (i, j) and returns the whitespace required.
+--
+-- See documentation for a reference table of interactions.
+--
+-- Only two grammar/real tokens are being considered:
+--
+-- * if `""`, no separation is needed,
+-- * if `" "`, then at least one whitespace (or EOL) is required.
+--
+-- Note: This doesn't work at the start or the end or for EOS!
+--
+-- @tparam int i
+-- @tparam int j
+-- @treturn string
+local function checkpair(i, j)
+  local t1, t2 = stoks[i], stoks[j]
+
+  if t1 == "TK_STRING" or t1 == "TK_LSTRING" or
+     t2 == "TK_STRING" or t2 == "TK_LSTRING" then
+    return ""
+
+  elseif t1 == "TK_OP" or t2 == "TK_OP" then
+    if (t1 == "TK_OP" and (t2 == "TK_KEYWORD" or t2 == "TK_NAME")) or
+       (t2 == "TK_OP" and (t1 == "TK_KEYWORD" or t1 == "TK_NAME")) then
+      return ""
+    end
+    if t1 == "TK_OP" and t2 == "TK_OP" then
+      -- for TK_OP/TK_OP pairs, see notes in technotes.txt
+      local op, op2 = sinfos[i], sinfos[j]
+      if (match(op, "^%.%.?$") and match(op2, "^%.")) or
+         (match(op, "^[~=<>]$") and op2 == "=") or
+         (op == "[" and (op2 == "[" or op2 == "=")) then
+        return " "
+      end
+      return ""
+    end
+    -- "TK_OP" + "TK_NUMBER" case
+    local op = sinfos[i]
+    if t2 == "TK_OP" then op = sinfos[j] end
+    if match(op, "^%.%.?%.?$") then
+      return " "
+    end
+    return ""
+
+  else-- "TK_KEYWORD" | "TK_NAME" | "TK_NUMBER" then
+    return " "
+
+  end
+end
+
+--- Repack tokens, removing deletions caused by optimization process.
+local function repack_tokens()
+  local dtoks, dinfos, dtoklns = {}, {}, {}
+  local j = 1
+  for i = 1, #stoks do
+    local tok = stoks[i]
+    if tok ~= "" then
+      dtoks[j], dinfos[j], dtoklns[j] = tok, sinfos[i], stoklns[i]
+      j = j + 1
+    end
+  end
+  stoks, sinfos, stoklns = dtoks, dinfos, dtoklns
+end
+
+--- Does number optimization.
+--
+-- Optimization using string formatting functions is one way of doing this,
+-- but here, we consider all cases and handle them separately (possibly an
+-- idiotic approach...).
+--
+-- Scientific notation being generated is not in canonical form, this may or
+-- may not be a bad thing.
+--
+-- Note: Intermediate portions need to fit into a normal number range.
+--
+-- Optimizations can be divided based on number patterns:
+--
+-- * hexadecimal:
+--   (1) no need to remove leading zeros, just skip to (2)
+--   (2) convert to integer if size equal or smaller
+--       * change if equal size -> lose the 'x' to reduce entropy
+--   (3) number is then processed as an integer
+--   (4) note: does not make 0[xX] consistent
+-- * integer:
+--   (1) reduce useless fractional part, if present, e.g. 123.000 -> 123.
+--   (2) remove leading zeros, e.g. 000123
+-- * float:
+--   (1) split into digits dot digits
+--   (2) if no integer portion, take as zero (can omit later)
+--   (3) handle degenerate .000 case, after which the fractional part
+--       must be non-zero (if zero, it's matched as float .0)
+--   (4) remove trailing zeros for fractional portion
+--   (5) p.q where p > 0 and q > 0 cannot be shortened any more
+--   (6) otherwise p == 0 and the form is .q, e.g. .000123
+--   (7) if scientific shorter, convert, e.g. .000123 -> 123e-6
+-- * scientific:
+--   (1) split into (digits dot digits) [eE] ([+-] digits)
+--   (2) if significand is zero, just use .0
+--   (3) remove leading zeros for significand
+--   (4) shift out trailing zeros for significand
+--   (5) examine exponent and determine which format is best:
+--       number with fraction, or scientific
+--
+-- Note: Number with fraction and scientific number is never converted
+-- to integer, because Lua 5.3 distinguishes between integers and floats.
+--
+--
+-- @tparam int i
+local function do_number(i)
+  local before = sinfos[i]      -- 'before'
+  local z = before              -- working representation
+  local y                       -- 'after', if better
+  --------------------------------------------------------------------
+  if match(z, "^0[xX]") then            -- hexadecimal number
+    local v = tostring(tonumber(z))
+    if #v <= #z then
+      z = v  -- change to integer, AND continue
+    else
+      return  -- no change; stick to hex
+    end
+  end
+
+  if match(z, "^%d+$") then        -- integer
+    if tonumber(z) > 0 then
+      y = match(z, "^0*([1-9]%d*)$")  -- remove leading zeros
+    else
+      y = "0"  -- basic zero
+    end
+
+  elseif not match(z, "[eE]") then      -- float
+    local p, q = match(z, "^(%d*)%.(%d*)$")  -- split
+    if p == "" then p = 0 end  -- int part zero
+    if q == "" then q = "0" end  -- fraction part zero
+    if tonumber(q) == 0 and p == 0 then
+      y = ".0"  -- degenerate .000 to .0
+    else
+      -- now, q > 0 holds and p is a number
+      local zeros_cnt = #match(q, "0*$")  -- remove trailing zeros
+      if zeros_cnt > 0 then
+        q = sub(q, 1, #q - zeros_cnt)
+      end
+      -- if p > 0, nothing else we can do to simplify p.q case
+      if tonumber(p) > 0 then
+        y = p.."."..q
+      else
+        y = "."..q  -- tentative, e.g. .000123
+        local v = #match(q, "^0*")  -- # leading spaces
+        local w = #q - v            -- # significant digits
+        local nv = tostring(#q)
+        -- e.g. compare 123e-6 versus .000123
+        if w + 2 + #nv < 1 + #q then
+          y = sub(q, -w).."e-"..nv
+        end
+      end
+    end
+
+  else                                  -- scientific number
+    local sig, ex = match(z, "^([^eE]+)[eE]([%+%-]?%d+)$")
+    ex = tonumber(ex)
+    -- if got ".", shift out fractional portion of significand
+    local p, q = match(sig, "^(%d*)%.(%d*)$")
+    if p then
+      ex = ex - #q
+      sig = p..q
+    end
+    if tonumber(sig) == 0 then
+      y = ".0"  -- basic float zero
+    else
+      local v = #match(sig, "^0*")  -- remove leading zeros
+      sig = sub(sig, v + 1)
+      v = #match(sig, "0*$") -- shift out trailing zeros
+      if v > 0 then
+        sig = sub(sig, 1, #sig - v)
+        ex = ex + v
+      end
+      -- examine exponent and determine which format is best
+      local nex = tostring(ex)
+      if ex >= 0 and (ex <= 1 + #nex) then  -- a float
+        y = sig..rep("0", ex).."."
+      elseif ex < 0 and (ex >= -#sig) then  -- fraction, e.g. .123
+        v = #sig + ex
+        y = sub(sig, 1, v).."."..sub(sig, v + 1)
+      elseif ex < 0 and (#nex >= -ex - #sig) then
+        -- e.g. compare 1234e-5 versus .01234
+        -- gives: #sig + 1 + #nex >= 1 + (-ex - #sig) + #sig
+        --     -> #nex >= -ex - #sig
+        v = -ex - #sig
+        y = "."..rep("0", v)..sig
+      else  -- non-canonical scientific representation
+        y = sig.."e"..ex
+      end
+    end--if sig
+  end
+
+  if y and y ~= sinfos[i] then
+    if opt_details then
+      print("<number> (line "..stoklns[i]..") "..sinfos[i].." -> "..y)
+      opt_details = opt_details + 1
+    end
+    sinfos[i] = y
+  end
+end
+
+--- Does string optimization.
+--
+-- Note: It works on well-formed strings only!
+--
+-- Optimizations on characters can be summarized as follows:
+--
+--     \a\b\f\n\r\t\v -- no change
+--     \\             -- no change
+--     \"\'           -- depends on delim, other can remove \
+--     \[\]           -- remove \
+--     \<char>        -- general escape, remove \  (Lua 5.1 only)
+--     \<eol>         -- normalize the EOL only
+--     \ddd           -- if \a\b\f\n\r\t\v, change to latter
+--                       if other < ascii 32, keep ddd but zap leading zeros
+--                                            but cannot have following digits
+--                       if >= ascii 32, translate it into the literal, then also
+--                                       do escapes for \\,\",\' cases
+--     <other>        -- no change
+--
+-- Switch delimiters if string becomes shorter.
+--
+-- @tparam int I
+local function do_string(I)
+  local info = sinfos[I]
+  local delim = sub(info, 1, 1)                 -- delimiter used
+  local ndelim = (delim == "'") and '"' or "'"  -- opposite " <-> '
+  local z = sub(info, 2, -2)                    -- actual string
+  local i = 1
+  local c_delim, c_ndelim = 0, 0                -- "/' counts
+
+  while i <= #z do
+    local c = sub(z, i, i)
+
+    if c == "\\" then                   -- escaped stuff
+      local j = i + 1
+      local d = sub(z, j, j)
+      local p = find("abfnrtv\\\n\r\"\'0123456789", d, 1, true)
+
+      if not p then                     -- \<char> -- remove \  (Lua 5.1 only)
+        z = sub(z, 1, i - 1)..sub(z, j)
+        i = i + 1
+
+      elseif p <= 8 then                -- \a\b\f\n\r\t\v\\
+        i = i + 2                       -- no change
+
+      elseif p <= 10 then               -- \<eol> -- normalize EOL
+        local eol = sub(z, j, j + 1)
+        if eol == "\r\n" or eol == "\n\r" then
+          z = sub(z, 1, i).."\n"..sub(z, j + 2)
+        elseif p == 10 then  -- \r case
+          z = sub(z, 1, i).."\n"..sub(z, j + 1)
+        end
+        i = i + 2
+
+      elseif p <= 12 then               -- \"\' -- remove \ for ndelim
+        if d == delim then
+          c_delim = c_delim + 1
+          i = i + 2
+        else
+          c_ndelim = c_ndelim + 1
+          z = sub(z, 1, i - 1)..sub(z, j)
+          i = i + 1
+        end
+
+      else                              -- \ddd -- various steps
+        local s = match(z, "^(%d%d?%d?)", j)
+        j = i + 1 + #s                  -- skip to location
+        local cv = tonumber(s)
+        local cc = char(cv)
+        p = find("\a\b\f\n\r\t\v", cc, 1, true)
+        if p then                       -- special escapes
+          s = "\\"..sub("abfnrtv", p, p)
+        elseif cv < 32 then             -- normalized \ddd
+          if match(sub(z, j, j), "%d") then
+            -- if a digit follows, \ddd cannot be shortened
+            s = "\\"..s
+          else
+            s = "\\"..cv
+          end
+        elseif cc == delim then         -- \<delim>
+          s = "\\"..cc
+          c_delim = c_delim + 1
+        elseif cc == "\\" then          -- \\
+          s = "\\\\"
+        else                            -- literal character
+          s = cc
+          if cc == ndelim then
+            c_ndelim = c_ndelim + 1
+          end
+        end
+        z = sub(z, 1, i - 1)..s..sub(z, j)
+        i = i + #s
+
+      end--if p
+
+    else-- c ~= "\\"                    -- <other> -- no change
+      i = i + 1
+      if c == ndelim then  -- count ndelim, for switching delimiters
+        c_ndelim = c_ndelim + 1
+      end
+
+    end--if c
+  end--while
+
+  -- Switching delimiters, a long-winded derivation:
+  -- (1) delim takes 2+2*c_delim bytes, ndelim takes c_ndelim bytes
+  -- (2) delim becomes c_delim bytes, ndelim becomes 2+2*c_ndelim bytes
+  -- simplifying the condition (1)>(2) --> c_delim > c_ndelim
+  if c_delim > c_ndelim then
+    i = 1
+    while i <= #z do
+      local p, _, r = find(z, "([\'\"])", i)
+      if not p then break end
+      if r == delim then                -- \<delim> -> <delim>
+        z = sub(z, 1, p - 2)..sub(z, p)
+        i = p
+      else-- r == ndelim                -- <ndelim> -> \<ndelim>
+        z = sub(z, 1, p - 1).."\\"..sub(z, p)
+        i = p + 2
+      end
+    end--while
+    delim = ndelim  -- actually change delimiters
+  end
+
+  z = delim..z..delim
+  if z ~= sinfos[I] then
+    if opt_details then
+      print("<string> (line "..stoklns[I]..") "..sinfos[I].." -> "..z)
+      opt_details = opt_details + 1
+    end
+    sinfos[I] = z
+  end
+end
+
+--- Does long string optimization.
+--
+-- * remove first optional newline
+-- * normalize embedded newlines
+-- * reduce '=' separators in delimiters if possible
+--
+-- Note: warning flagged if trailing whitespace found, not trimmed.
+--
+-- @tparam int I
+local function do_lstring(I)
+  local info = sinfos[I]
+  local delim1 = match(info, "^%[=*%[")  -- cut out delimiters
+  local sep = #delim1
+  local delim2 = sub(info, -sep, -1)
+  local z = sub(info, sep + 1, -(sep + 1))  -- lstring without delims
+  local y = ""
+  local i = 1
+
+  while true do
+    local p, _, r, s = find(z, "([\r\n])([\r\n]?)", i)
+    -- deal with a single line
+    local ln
+    if not p then
+      ln = sub(z, i)
+    elseif p >= i then
+      ln = sub(z, i, p - 1)
+    end
+    if ln ~= "" then
+      -- flag a warning if there are trailing spaces, won't optimize!
+      if match(ln, "%s+$") then
+        M.warn.LSTRING = "trailing whitespace in long string near line "..stoklns[I]
+      end
+      y = y..ln
+    end
+    if not p then  -- done if no more EOLs
+      break
+    end
+    -- deal with line endings, normalize them
+    i = p + 1
+    if p then
+      if #s > 0 and r ~= s then  -- skip CRLF or LFCR
+        i = i + 1
+      end
+      -- skip first newline, which can be safely deleted
+      if not(i == 1 and i == p) then
+        y = y.."\n"
+      end
+    end
+  end--while
+
+  -- handle possible deletion of one or more '=' separators
+  if sep >= 3 then
+    local chk, okay = sep - 1
+    -- loop to test ending delimiter with less of '=' down to zero
+    while chk >= 2 do
+      local delim = "%]"..rep("=", chk - 2).."%]"
+      if not match(y.."]", delim) then okay = chk end
+      chk = chk - 1
+    end
+    if okay then  -- change delimiters
+      sep = rep("=", okay - 2)
+      delim1, delim2 = "["..sep.."[", "]"..sep.."]"
+    end
+  end
+
+  sinfos[I] = delim1..y..delim2
+end
+
+--- Does long comment optimization.
+--
+-- * trim trailing whitespace
+-- * normalize embedded newlines
+-- * reduce '=' separators in delimiters if possible
+--
+-- Note: It does not remove first optional newline.
+--
+-- @tparam int I
+local function do_lcomment(I)
+  local info = sinfos[I]
+  local delim1 = match(info, "^%-%-%[=*%[")  -- cut out delimiters
+  local sep = #delim1
+  local delim2 = sub(info, -(sep - 2), -1)
+  local z = sub(info, sep + 1, -(sep - 1))  -- comment without delims
+  local y = ""
+  local i = 1
+
+  while true do
+    local p, _, r, s = find(z, "([\r\n])([\r\n]?)", i)
+    -- deal with a single line, extract and check trailing whitespace
+    local ln
+    if not p then
+      ln = sub(z, i)
+    elseif p >= i then
+      ln = sub(z, i, p - 1)
+    end
+    if ln ~= "" then
+      -- trim trailing whitespace if non-empty line
+      local ws = match(ln, "%s*$")
+      if #ws > 0 then ln = sub(ln, 1, -(ws + 1)) end
+      y = y..ln
+    end
+    if not p then  -- done if no more EOLs
+      break
+    end
+    -- deal with line endings, normalize them
+    i = p + 1
+    if p then
+      if #s > 0 and r ~= s then  -- skip CRLF or LFCR
+        i = i + 1
+      end
+      y = y.."\n"
+    end
+  end--while
+
+  -- handle possible deletion of one or more '=' separators
+  sep = sep - 2
+  if sep >= 3 then
+    local chk, okay = sep - 1
+    -- loop to test ending delimiter with less of '=' down to zero
+    while chk >= 2 do
+      local delim = "%]"..rep("=", chk - 2).."%]"
+      if not match(y, delim) then okay = chk end
+      chk = chk - 1
+    end
+    if okay then  -- change delimiters
+      sep = rep("=", okay - 2)
+      delim1, delim2 = "--["..sep.."[", "]"..sep.."]"
+    end
+  end
+
+  sinfos[I] = delim1..y..delim2
+end
+
+--- Does short comment optimization.
+--
+-- * trim trailing whitespace
+--
+-- @tparam int i
+local function do_comment(i)
+  local info = sinfos[i]
+  local ws = match(info, "%s*$")        -- just look from end of string
+  if #ws > 0 then
+    info = sub(info, 1, -(ws + 1))      -- trim trailing whitespace
+  end
+  sinfos[i] = info
+end
+
+--- Returns true if string found in long comment.
+--
+-- This is a feature to keep copyright or license texts.
+--
+-- @tparam bool opt_keep
+-- @tparam string info
+-- @treturn bool
+local function keep_lcomment(opt_keep, info)
+  if not opt_keep then return false end  -- option not set
+  local delim1 = match(info, "^%-%-%[=*%[")  -- cut out delimiters
+  local sep = #delim1
+  local z = sub(info, sep + 1, -(sep - 1))  -- comment without delims
+  if find(z, opt_keep, 1, true) then  -- try to match
+    return true
+  end
+end
+
+--- The main entry point.
+--
+-- * currently, lexer processing has 2 passes
+-- * processing is done on a line-oriented basis, which is easier to
+--   grok due to the next point...
+-- * since there are various options that can be enabled or disabled,
+--   processing is a little messy or convoluted
+--
+-- @tparam {[string]=bool,...} option
+-- @tparam {string,...} toklist
+-- @tparam {string,...} semlist
+-- @tparam {int,...} toklnlist
+-- @treturn {string,...} toklist
+-- @treturn {string,...} semlist
+-- @treturn {int,...} toklnlist
+function M.optimize(option, toklist, semlist, toklnlist)
+  -- Set option flags.
+  local opt_comments = option["opt-comments"]
+  local opt_whitespace = option["opt-whitespace"]
+  local opt_emptylines = option["opt-emptylines"]
+  local opt_eols = option["opt-eols"]
+  local opt_strings = option["opt-strings"]
+  local opt_numbers = option["opt-numbers"]
+  local opt_x = option["opt-experimental"]
+  local opt_keep = option.KEEP
+  opt_details = option.DETAILS and 0  -- upvalues for details display
+  print = M.print or _G.print
+  if opt_eols then  -- forced settings, otherwise won't work properly
+    opt_comments = true
+    opt_whitespace = true
+    opt_emptylines = true
+  elseif opt_x then
+    opt_whitespace = true
+  end
+
+  -- Variable initialization.
+  stoks, sinfos, stoklns                -- set source lists
+    = toklist, semlist, toklnlist
+  local i = 1                           -- token position
+  local tok, info                       -- current token
+  local prev    -- position of last grammar token
+                -- on same line (for TK_SPACE stuff)
+
+  -- Changes a token, info pair.
+  local function settoken(tok, info, I)  --luacheck: ignore 431
+    I = I or i
+    stoks[I] = tok or ""
+    sinfos[I] = info or ""
+  end
+
+  -- Experimental optimization for ';' operator.
+  if opt_x then
+    while true do
+      tok, info = stoks[i], sinfos[i]
+      if tok == "TK_EOS" then           -- end of stream/pass
+        break
+      elseif tok == "TK_OP" and info == ";" then
+        -- ';' operator found, since it is entirely optional, set it
+        -- as a space to let whitespace optimization do the rest
+        settoken("TK_SPACE", " ")
+      end
+      i = i + 1
+    end
+    repack_tokens()
+  end
+
+  -- Processing loop (PASS 1)
+  i = 1
+  while true do
+    tok, info = stoks[i], sinfos[i]
+
+    local atstart = atlinestart(i)      -- set line begin flag
+    if atstart then prev = nil end
+
+    if tok == "TK_EOS" then             -- end of stream/pass
+      break
+
+    elseif tok == "TK_KEYWORD" or       -- keywords, identifiers,
+           tok == "TK_NAME" or          -- operators
+           tok == "TK_OP" then
+      -- TK_KEYWORD and TK_OP can't be optimized without a big
+      -- optimization framework; it would be more of an optimizing
+      -- compiler, not a source code compressor
+      -- TK_NAME that are locals needs parser to analyze/optimize
+      prev = i
+
+    elseif tok == "TK_NUMBER" then      -- numbers
+      if opt_numbers then
+        do_number(i)  -- optimize
+      end
+      prev = i
+
+    elseif tok == "TK_STRING" or        -- strings, long strings
+           tok == "TK_LSTRING" then
+      if opt_strings then
+        if tok == "TK_STRING" then
+          do_string(i)  -- optimize
+        else
+          do_lstring(i)  -- optimize
+        end
+      end
+      prev = i
+
+    elseif tok == "TK_COMMENT" then     -- short comments
+      if opt_comments then
+        if i == 1 and sub(info, 1, 1) == "#" then
+          -- keep shbang comment, trim whitespace
+          do_comment(i)
+        else
+          -- safe to delete, as a TK_EOL (or TK_EOS) always follows
+          settoken()  -- remove entirely
+        end
+      elseif opt_whitespace then        -- trim whitespace only
+        do_comment(i)
+      end
+
+    elseif tok == "TK_LCOMMENT" then    -- long comments
+      if keep_lcomment(opt_keep, info) then
+        -- if --keep, we keep a long comment if <msg> is found;
+        -- this is a feature to keep copyright or license texts
+        if opt_whitespace then          -- trim whitespace only
+          do_lcomment(i)
+        end
+        prev = i
+      elseif opt_comments then
+        local eols = commenteols(info)
+
+        -- prepare opt_emptylines case first, if a disposable token
+        -- follows, current one is safe to dump, else keep a space;
+        -- it is implied that the operation is safe for '-', because
+        -- current is a TK_LCOMMENT, and must be separate from a '-'
+        if is_faketoken[stoks[i + 1]] then
+          settoken()  -- remove entirely
+          tok = ""
+        else
+          settoken("TK_SPACE", " ")
+        end
+
+        -- if there are embedded EOLs to keep and opt_emptylines is
+        -- disabled, then switch the token into one or more EOLs
+        if not opt_emptylines and eols > 0 then
+          settoken("TK_EOL", rep("\n", eols))
+        end
+
+        -- if optimizing whitespaces, force reinterpretation of the
+        -- token to give a chance for the space to be optimized away
+        if opt_whitespace and tok ~= "" then
+          i = i - 1  -- to reinterpret
+        end
+      else                              -- disabled case
+        if opt_whitespace then          -- trim whitespace only
+          do_lcomment(i)
+        end
+        prev = i
+      end
+
+    elseif tok == "TK_EOL" then         -- line endings
+      if atstart and opt_emptylines then
+        settoken()  -- remove entirely
+      elseif info == "\r\n" or info == "\n\r" then
+        -- normalize the rest of the EOLs for CRLF/LFCR only
+        -- (note that TK_LCOMMENT can change into several EOLs)
+        settoken("TK_EOL", "\n")
+      end
+
+    elseif tok == "TK_SPACE" then       -- whitespace
+      if opt_whitespace then
+        if atstart or atlineend(i) then
+          -- delete leading and trailing whitespace
+          settoken()  -- remove entirely
+        else
+
+          -- at this point, since leading whitespace have been removed,
+          -- there should be a either a real token or a TK_LCOMMENT
+          -- prior to hitting this whitespace; the TK_LCOMMENT case
+          -- only happens if opt_comments is disabled; so prev ~= nil
+          local ptok = stoks[prev]
+          if ptok == "TK_LCOMMENT" then
+            -- previous TK_LCOMMENT can abut with anything
+            settoken()  -- remove entirely
+          else
+            -- prev must be a grammar token; consecutive TK_SPACE
+            -- tokens is impossible when optimizing whitespace
+            local ntok = stoks[i + 1]
+            if is_faketoken[ntok] then
+              -- handle special case where a '-' cannot abut with
+              -- either a short comment or a long comment
+              if (ntok == "TK_COMMENT" or ntok == "TK_LCOMMENT") and
+                 ptok == "TK_OP" and sinfos[prev] == "-" then
+                -- keep token
+              else
+                settoken()  -- remove entirely
+              end
+            else--is_realtoken
+              -- check a pair of grammar tokens, if can abut, then
+              -- delete space token entirely, otherwise keep one space
+              local s = checkpair(prev, i + 1)
+              if s == "" then
+                settoken()  -- remove entirely
+              else
+                settoken("TK_SPACE", " ")
+              end
+            end
+          end
+
+        end
+      end
+
+    else
+      error("unidentified token encountered")
+    end
+
+    i = i + 1
+  end--while
+  repack_tokens()
+
+  -- Processing loop (PASS 2)
+  if opt_eols then
+    i = 1
+    -- Aggressive EOL removal only works with most non-grammar tokens
+    -- optimized away because it is a rather simple scheme -- basically
+    -- it just checks 'real' token pairs around EOLs.
+    if stoks[1] == "TK_COMMENT" then
+      -- first comment still existing must be shbang, skip whole line
+      i = 3
+    end
+    while true do
+      tok = stoks[i]
+
+      if tok == "TK_EOS" then           -- end of stream/pass
+        break
+
+      elseif tok == "TK_EOL" then       -- consider each TK_EOL
+        local t1, t2 = stoks[i - 1], stoks[i + 1]
+        if is_realtoken[t1] and is_realtoken[t2] then  -- sanity check
+          local s = checkpair(i - 1, i + 1)
+          if s == "" or t2 == "TK_EOS" then
+            settoken()  -- remove entirely
+          end
+        end
+      end--if tok
+
+      i = i + 1
+    end--while
+    repack_tokens()
+  end
+
+  if opt_details and opt_details > 0 then print() end -- spacing
+  return stoks, sinfos, stoklns
+end
+
+return M

tools/luasrcdiet/optparser.lua

@@ -0,0 +1,644 @@
+---------
+-- This module does parser-based optimizations.
+--
+-- **Notes:**
+--
+-- * The processing load is quite significant, but since this is an
+--   off-line text processor, I believe we can wait a few seconds.
+-- * TODO: Might process "local a,a,a" wrongly... need tests!
+-- * TODO: Remove position handling if overlapped locals (rem < 0)
+--   needs more study, to check behaviour.
+-- * TODO: There are probably better ways to do allocation, e.g. by
+--   choosing better methods to sort and pick locals...
+-- * TODO: We don't need 53*63 two-letter identifiers; we can make
+--   do with significantly less depending on how many that are really
+--   needed and improve entropy; e.g. 13 needed -> choose 4*4 instead.
+----
+local byte = string.byte
+local char = string.char
+local concat = table.concat
+local fmt = string.format
+local pairs = pairs
+local rep = string.rep
+local sort = table.sort
+local sub = string.sub
+
+
+local M = {}
+
+-- Letter frequencies for reducing symbol entropy (fixed version)
+-- * Might help a wee bit when the output file is compressed
+-- * See Wikipedia: http://en.wikipedia.org/wiki/Letter_frequencies
+-- * We use letter frequencies according to a Linotype keyboard, plus
+--   the underscore, and both lower case and upper case letters.
+-- * The arrangement below (LC, underscore, %d, UC) is arbitrary.
+-- * This is certainly not optimal, but is quick-and-dirty and the
+--   process has no significant overhead
+local LETTERS = "etaoinshrdlucmfwypvbgkqjxz_ETAOINSHRDLUCMFWYPVBGKQJXZ"
+local ALPHANUM = "etaoinshrdlucmfwypvbgkqjxz_0123456789ETAOINSHRDLUCMFWYPVBGKQJXZ"
+
+-- Names or identifiers that must be skipped.
+-- (The first two lines are for keywords.)
+local SKIP_NAME = {}
+for v in ([[
+and break do else elseif end false for function if in
+local nil not or repeat return then true until while
+self _ENV]]):gmatch("%S+") do
+  SKIP_NAME[v] = true
+end
+
+
+local toklist, seminfolist,             -- token lists (lexer output)
+      tokpar, seminfopar, xrefpar,      -- token lists (parser output)
+      globalinfo, localinfo,            -- variable information tables
+      statinfo,                         -- statment type table
+      globaluniq, localuniq,            -- unique name tables
+      var_new,                          -- index of new variable names
+      varlist                           -- list of output variables
+
+--- Preprocesses information table to get lists of unique names.
+--
+-- @tparam {table,...} infotable
+-- @treturn table
+local function preprocess(infotable)
+  local uniqtable = {}
+  for i = 1, #infotable do              -- enumerate info table
+    local obj = infotable[i]
+    local name = obj.name
+
+    if not uniqtable[name] then         -- not found, start an entry
+      uniqtable[name] = {
+        decl = 0, token = 0, size = 0,
+      }
+    end
+
+    local uniq = uniqtable[name]        -- count declarations, tokens, size
+    uniq.decl = uniq.decl + 1
+    local xref = obj.xref
+    local xcount = #xref
+    uniq.token = uniq.token + xcount
+    uniq.size = uniq.size + xcount * #name
+
+    if obj.decl then            -- if local table, create first,last pairs
+      obj.id = i
+      obj.xcount = xcount
+      if xcount > 1 then        -- if ==1, means local never accessed
+        obj.first = xref[2]
+        obj.last = xref[xcount]
+      end
+
+    else                        -- if global table, add a back ref
+      uniq.id = i
+    end
+
+  end--for
+  return uniqtable
+end
+
+--- Calculates actual symbol frequencies, in order to reduce entropy.
+--
+-- * This may help further reduce the size of compressed sources.
+-- * Note that since parsing optimizations is put before lexing
+--   optimizations, the frequency table is not exact!
+-- * Yes, this will miss --keep block comments too...
+--
+-- @tparam table option
+local function recalc_for_entropy(option)
+  -- table of token classes to accept in calculating symbol frequency
+  local ACCEPT = {
+    TK_KEYWORD = true, TK_NAME = true, TK_NUMBER = true,
+    TK_STRING = true, TK_LSTRING = true,
+  }
+  if not option["opt-comments"] then
+    ACCEPT.TK_COMMENT = true
+    ACCEPT.TK_LCOMMENT = true
+  end
+
+  -- Create a new table and remove any original locals by filtering.
+  local filtered = {}
+  for i = 1, #toklist do
+    filtered[i] = seminfolist[i]
+  end
+  for i = 1, #localinfo do              -- enumerate local info table
+    local obj = localinfo[i]
+    local xref = obj.xref
+    for j = 1, obj.xcount do
+      local p = xref[j]
+      filtered[p] = ""                  -- remove locals
+    end
+  end
+
+  local freq = {}                       -- reset symbol frequency table
+  for i = 0, 255 do freq[i] = 0 end
+  for i = 1, #toklist do                -- gather symbol frequency
+    local tok, info = toklist[i], filtered[i]
+    if ACCEPT[tok] then
+      for j = 1, #info do
+        local c = byte(info, j)
+        freq[c] = freq[c] + 1
+      end
+    end--if
+  end--for
+
+  -- Re-sorts symbols according to actual frequencies.
+  --
+  -- @tparam string symbols
+  -- @treturn string
+  local function resort(symbols)
+    local symlist = {}
+    for i = 1, #symbols do              -- prepare table to sort
+      local c = byte(symbols, i)
+      symlist[i] = { c = c, freq = freq[c], }
+    end
+    sort(symlist, function(v1, v2)  -- sort selected symbols
+        return v1.freq > v2.freq
+      end)
+    local charlist = {}                 -- reconstitute the string
+    for i = 1, #symlist do
+      charlist[i] = char(symlist[i].c)
+    end
+    return concat(charlist)
+  end
+
+  LETTERS = resort(LETTERS)             -- change letter arrangement
+  ALPHANUM = resort(ALPHANUM)
+end
+
+--- Returns a string containing a new local variable name to use, and
+-- a flag indicating whether it collides with a global variable.
+--
+-- Trapping keywords and other names like 'self' is done elsewhere.
+--
+-- @treturn string A new local variable name.
+-- @treturn bool Whether the name collides with a global variable.
+local function new_var_name()
+  local var
+  local cletters, calphanum = #LETTERS, #ALPHANUM
+  local v = var_new
+  if v < cletters then                  -- single char
+    v = v + 1
+    var = sub(LETTERS, v, v)
+  else                                  -- longer names
+    local range, sz = cletters, 1       -- calculate # chars fit
+    repeat
+      v = v - range
+      range = range * calphanum
+      sz = sz + 1
+    until range > v
+    local n = v % cletters              -- left side cycles faster
+    v = (v - n) / cletters              -- do first char first
+    n = n + 1
+    var = sub(LETTERS, n, n)
+    while sz > 1 do
+      local m = v % calphanum
+      v = (v - m) / calphanum
+      m = m + 1
+      var = var..sub(ALPHANUM, m, m)
+      sz = sz - 1
+    end
+  end
+  var_new = var_new + 1
+  return var, globaluniq[var] ~= nil
+end
+
+--- Calculates and prints some statistics.
+--
+-- Note: probably better in main source, put here for now.
+--
+-- @tparam table globaluniq
+-- @tparam table localuniq
+-- @tparam table afteruniq
+-- @tparam table option
+local function stats_summary(globaluniq, localuniq, afteruniq, option)  --luacheck: ignore 431
+  local print = M.print or print
+  local opt_details = option.DETAILS
+  if option.QUIET then return end
+
+  local uniq_g , uniq_li, uniq_lo = 0, 0, 0
+  local decl_g, decl_li, decl_lo = 0, 0, 0
+  local token_g, token_li, token_lo = 0, 0, 0
+  local size_g, size_li, size_lo = 0, 0, 0
+
+  local function avg(c, l)              -- safe average function
+    if c == 0 then return 0 end
+    return l / c
+  end
+
+  -- Collect statistics (Note: globals do not have declarations!)
+  for _, uniq in pairs(globaluniq) do
+    uniq_g = uniq_g + 1
+    token_g = token_g + uniq.token
+    size_g = size_g + uniq.size
+  end
+  for _, uniq in pairs(localuniq) do
+    uniq_li = uniq_li + 1
+    decl_li = decl_li + uniq.decl
+    token_li = token_li + uniq.token
+    size_li = size_li + uniq.size
+  end
+  for _, uniq in pairs(afteruniq) do
+    uniq_lo = uniq_lo + 1
+    decl_lo = decl_lo + uniq.decl
+    token_lo = token_lo + uniq.token
+    size_lo = size_lo + uniq.size
+  end
+  local uniq_ti = uniq_g + uniq_li
+  local decl_ti = decl_g + decl_li
+  local token_ti = token_g + token_li
+  local size_ti = size_g + size_li
+  local uniq_to = uniq_g + uniq_lo
+  local decl_to = decl_g + decl_lo
+  local token_to = token_g + token_lo
+  local size_to = size_g + size_lo
+
+  -- Detailed stats: global list
+  if opt_details then
+    local sorted = {} -- sort table of unique global names by size
+    for name, uniq in pairs(globaluniq) do
+      uniq.name = name
+      sorted[#sorted + 1] = uniq
+    end
+    sort(sorted, function(v1, v2)
+        return v1.size > v2.size
+      end)
+
+    do
+      local tabf1, tabf2 = "%8s%8s%10s  %s", "%8d%8d%10.2f  %s"
+      local hl = rep("-", 44)
+      print("*** global variable list (sorted by size) ***\n"..hl)
+      print(fmt(tabf1, "Token",  "Input", "Input", "Global"))
+      print(fmt(tabf1, "Count", "Bytes", "Average", "Name"))
+      print(hl)
+      for i = 1, #sorted do
+        local uniq = sorted[i]
+        print(fmt(tabf2, uniq.token, uniq.size, avg(uniq.token, uniq.size), uniq.name))
+      end
+      print(hl)
+      print(fmt(tabf2, token_g, size_g, avg(token_g, size_g), "TOTAL"))
+      print(hl.."\n")
+    end
+
+    -- Detailed stats: local list
+    do
+      local tabf1, tabf2 = "%8s%8s%8s%10s%8s%10s  %s", "%8d%8d%8d%10.2f%8d%10.2f  %s"
+      local hl = rep("-", 70)
+      print("*** local variable list (sorted by allocation order) ***\n"..hl)
+      print(fmt(tabf1, "Decl.", "Token",  "Input", "Input", "Output", "Output", "Global"))
+      print(fmt(tabf1, "Count", "Count", "Bytes", "Average", "Bytes", "Average", "Name"))
+      print(hl)
+      for i = 1, #varlist do  -- iterate according to order assigned
+        local name = varlist[i]
+        local uniq = afteruniq[name]
+        local old_t, old_s = 0, 0
+        for j = 1, #localinfo do  -- find corresponding old names and calculate
+          local obj = localinfo[j]
+          if obj.name == name then
+            old_t = old_t + obj.xcount
+            old_s = old_s + obj.xcount * #obj.oldname
+          end
+        end
+        print(fmt(tabf2, uniq.decl, uniq.token, old_s, avg(old_t, old_s),
+                  uniq.size, avg(uniq.token, uniq.size), name))
+      end
+      print(hl)
+      print(fmt(tabf2, decl_lo, token_lo, size_li, avg(token_li, size_li),
+                size_lo, avg(token_lo, size_lo), "TOTAL"))
+      print(hl.."\n")
+    end
+  end--if opt_details
+
+  -- Display output
+  do
+    local tabf1, tabf2 = "%-16s%8s%8s%8s%8s%10s", "%-16s%8d%8d%8d%8d%10.2f"
+    local hl = rep("-", 58)
+    print("*** local variable optimization summary ***\n"..hl)
+    print(fmt(tabf1, "Variable",  "Unique", "Decl.", "Token", "Size", "Average"))
+    print(fmt(tabf1, "Types", "Names", "Count", "Count", "Bytes", "Bytes"))
+    print(hl)
+    print(fmt(tabf2, "Global", uniq_g, decl_g, token_g, size_g, avg(token_g, size_g)))
+    print(hl)
+    print(fmt(tabf2, "Local (in)", uniq_li, decl_li, token_li, size_li, avg(token_li, size_li)))
+    print(fmt(tabf2, "TOTAL (in)", uniq_ti, decl_ti, token_ti, size_ti, avg(token_ti, size_ti)))
+    print(hl)
+    print(fmt(tabf2, "Local (out)", uniq_lo, decl_lo, token_lo, size_lo, avg(token_lo, size_lo)))
+    print(fmt(tabf2, "TOTAL (out)", uniq_to, decl_to, token_to, size_to, avg(token_to, size_to)))
+    print(hl.."\n")
+  end
+end
+
+--- Does experimental optimization for f("string") statements.
+--
+-- It's safe to delete parentheses without adding whitespace, as both
+-- kinds of strings can abut with anything else.
+local function optimize_func1()
+
+  local function is_strcall(j)          -- find f("string") pattern
+    local t1 = tokpar[j + 1] or ""
+    local t2 = tokpar[j + 2] or ""
+    local t3 = tokpar[j + 3] or ""
+    if t1 == "(" and t2 == "<string>" and t3 == ")" then
+      return true
+    end
+  end
+
+  local del_list = {}           -- scan for function pattern,
+  local i = 1                   -- tokens to be deleted are marked
+  while i <= #tokpar do
+    local id = statinfo[i]
+    if id == "call" and is_strcall(i) then  -- found & mark ()
+      del_list[i + 1] = true    -- '('
+      del_list[i + 3] = true    -- ')'
+      i = i + 3
+    end
+    i = i + 1
+  end
+
+  -- Delete a token and adjust all relevant tables.
+  -- * Currently invalidates globalinfo and localinfo (not updated),
+  --   so any other optimization is done after processing locals
+  --   (of course, we can also lex the source data again...).
+  -- * Faster one-pass token deletion.
+  local del_list2 = {}
+  do
+    local i, dst, idend = 1, 1, #tokpar
+    while dst <= idend do         -- process parser tables
+      if del_list[i] then         -- found a token to delete?
+        del_list2[xrefpar[i]] = true
+        i = i + 1
+      end
+      if i > dst then
+        if i <= idend then        -- shift table items lower
+          tokpar[dst] = tokpar[i]
+          seminfopar[dst] = seminfopar[i]
+          xrefpar[dst] = xrefpar[i] - (i - dst)
+          statinfo[dst] = statinfo[i]
+        else                      -- nil out excess entries
+          tokpar[dst] = nil
+          seminfopar[dst] = nil
+          xrefpar[dst] = nil
+          statinfo[dst] = nil
+        end
+      end
+      i = i + 1
+      dst = dst + 1
+    end
+  end
+
+  do
+    local i, dst, idend = 1, 1, #toklist
+    while dst <= idend do         -- process lexer tables
+      if del_list2[i] then        -- found a token to delete?
+        i = i + 1
+      end
+      if i > dst then
+        if i <= idend then        -- shift table items lower
+          toklist[dst] = toklist[i]
+          seminfolist[dst] = seminfolist[i]
+        else                      -- nil out excess entries
+          toklist[dst] = nil
+          seminfolist[dst] = nil
+        end
+      end
+      i = i + 1
+      dst = dst + 1
+    end
+  end
+end
+
+--- Does local variable optimization.
+--
+-- @tparam {[string]=bool,...} option
+local function optimize_locals(option)
+  var_new = 0                           -- reset variable name allocator
+  varlist = {}
+
+  -- Preprocess global/local tables, handle entropy reduction.
+  globaluniq = preprocess(globalinfo)
+  localuniq = preprocess(localinfo)
+  if option["opt-entropy"] then         -- for entropy improvement
+    recalc_for_entropy(option)
+  end
+
+  -- Build initial declared object table, then sort according to
+  -- token count, this might help assign more tokens to more common
+  -- variable names such as 'e' thus possibly reducing entropy.
+  -- * An object knows its localinfo index via its 'id' field.
+  -- * Special handling for "self" and "_ENV" special local (parameter) here.
+  local object = {}
+  for i = 1, #localinfo do
+    object[i] = localinfo[i]
+  end
+  sort(object, function(v1, v2)  -- sort largest first
+      return v1.xcount > v2.xcount
+    end)
+
+  -- The special "self" and "_ENV" function parameters must be preserved.
+  -- * The allocator below will never use "self", so it is safe to
+  --   keep those implicit declarations as-is.
+  local temp, j, used_specials = {}, 1, {}
+  for i = 1, #object do
+    local obj = object[i]
+    if not obj.is_special then
+      temp[j] = obj
+      j = j + 1
+    else
+      used_specials[#used_specials + 1] = obj.name
+    end
+  end
+  object = temp
+
+  -- A simple first-come first-served heuristic name allocator,
+  -- note that this is in no way optimal...
+  -- * Each object is a local variable declaration plus existence.
+  -- * The aim is to assign short names to as many tokens as possible,
+  --   so the following tries to maximize name reuse.
+  -- * Note that we preserve sort order.
+  local nobject = #object
+  while nobject > 0 do
+    local varname, gcollide
+    repeat
+      varname, gcollide = new_var_name()  -- collect a variable name
+    until not SKIP_NAME[varname]          -- skip all special names
+    varlist[#varlist + 1] = varname       -- keep a list
+    local oleft = nobject
+
+    -- If variable name collides with an existing global, the name
+    -- cannot be used by a local when the name is accessed as a global
+    -- during which the local is alive (between 'act' to 'rem'), so
+    -- we drop objects that collides with the corresponding global.
+    if gcollide then
+      -- find the xref table of the global
+      local gref = globalinfo[globaluniq[varname].id].xref
+      local ngref = #gref
+      -- enumerate for all current objects; all are valid at this point
+      for i = 1, nobject do
+        local obj = object[i]
+        local act, rem = obj.act, obj.rem  -- 'live' range of local
+        -- if rem < 0, it is a -id to a local that had the same name
+        -- so follow rem to extend it; does this make sense?
+        while rem < 0 do
+          rem = localinfo[-rem].rem
+        end
+        local drop
+        for j = 1, ngref do
+          local p = gref[j]
+          if p >= act and p <= rem then drop = true end  -- in range?
+        end
+        if drop then
+          obj.skip = true
+          oleft = oleft - 1
+        end
+      end--for
+    end--if gcollide
+
+    -- Now the first unassigned local (since it's sorted) will be the
+    -- one with the most tokens to rename, so we set this one and then
+    -- eliminate all others that collides, then any locals that left
+    -- can then reuse the same variable name; this is repeated until
+    -- all local declaration that can use this name is assigned.
+    --
+    -- The criteria for local-local reuse/collision is:
+    --   A is the local with a name already assigned
+    --   B is the unassigned local under consideration
+    --   => anytime A is accessed, it cannot be when B is 'live'
+    --   => to speed up things, we have first/last accesses noted
+    while oleft > 0 do
+      local i = 1
+      while object[i].skip do  -- scan for first object
+        i = i + 1
+      end
+
+      -- First object is free for assignment of the variable name
+      -- [first,last] gives the access range for collision checking.
+      oleft = oleft - 1
+      local obja = object[i]
+      i = i + 1
+      obja.newname = varname
+      obja.skip = true
+      obja.done = true
+      local first, last = obja.first, obja.last
+      local xref = obja.xref
+
+      -- Then, scan all the rest and drop those colliding.
+      -- If A was never accessed then it'll never collide with anything
+      -- otherwise trivial skip if:
+      -- * B was activated after A's last access (last < act),
+      -- * B was removed before A's first access (first > rem),
+      -- if not, see detailed skip below...
+      if first and oleft > 0 then  -- must have at least 1 access
+        local scanleft = oleft
+        while scanleft > 0 do
+          while object[i].skip do  -- next valid object
+            i = i + 1
+          end
+          scanleft = scanleft - 1
+          local objb = object[i]
+          i = i + 1
+          local act, rem = objb.act, objb.rem  -- live range of B
+          -- if rem < 0, extend range of rem thru' following local
+          while rem < 0 do
+            rem = localinfo[-rem].rem
+          end
+
+          if not(last < act or first > rem) then  -- possible collision
+
+            -- B is activated later than A or at the same statement,
+            -- this means for no collision, A cannot be accessed when B
+            -- is alive, since B overrides A (or is a peer).
+            if act >= obja.act then
+              for j = 1, obja.xcount do  -- ... then check every access
+                local p = xref[j]
+                if p >= act and p <= rem then  -- A accessed when B live!
+                  oleft = oleft - 1
+                  objb.skip = true
+                  break
+                end
+              end--for
+
+            -- A is activated later than B, this means for no collision,
+            -- A's access is okay since it overrides B, but B's last
+            -- access need to be earlier than A's activation time.
+            else
+              if objb.last and objb.last >= obja.act then
+                oleft = oleft - 1
+                objb.skip = true
+              end
+            end
+          end
+
+          if oleft == 0 then break end
+        end
+      end--if first
+
+    end--while
+
+    -- After assigning all possible locals to one variable name, the
+    -- unassigned locals/objects have the skip field reset and the table
+    -- is compacted, to hopefully reduce iteration time.
+    local temp, j = {}, 1
+    for i = 1, nobject do
+      local obj = object[i]
+      if not obj.done then
+        obj.skip = false
+        temp[j] = obj
+        j = j + 1
+      end
+    end
+    object = temp  -- new compacted object table
+    nobject = #object  -- objects left to process
+
+  end--while
+
+  -- After assigning all locals with new variable names, we can
+  -- patch in the new names, and reprocess to get 'after' stats.
+  for i = 1, #localinfo do  -- enumerate all locals
+    local obj = localinfo[i]
+    local xref = obj.xref
+    if obj.newname then                 -- if got new name, patch it in
+      for j = 1, obj.xcount do
+        local p = xref[j]               -- xrefs indexes the token list
+        seminfolist[p] = obj.newname
+      end
+      obj.name, obj.oldname             -- adjust names
+        = obj.newname, obj.name
+    else
+      obj.oldname = obj.name            -- for cases like 'self'
+    end
+  end
+
+  -- Deal with statistics output.
+  for _, name in ipairs(used_specials) do
+    varlist[#varlist + 1] = name
+  end
+  local afteruniq = preprocess(localinfo)
+  stats_summary(globaluniq, localuniq, afteruniq, option)
+end
+
+--- The main entry point.
+--
+-- @tparam table option
+-- @tparam {string,...} _toklist
+-- @tparam {string,...} _seminfolist
+-- @tparam table xinfo
+function M.optimize(option, _toklist, _seminfolist, xinfo)
+  -- set tables
+  toklist, seminfolist                  -- from lexer
+    = _toklist, _seminfolist
+  tokpar, seminfopar, xrefpar           -- from parser
+    = xinfo.toklist, xinfo.seminfolist, xinfo.xreflist
+  globalinfo, localinfo, statinfo       -- from parser
+    = xinfo.globalinfo, xinfo.localinfo, xinfo.statinfo
+
+  -- Optimize locals.
+  if option["opt-locals"] then
+    optimize_locals(option)
+  end
+
+  -- Other optimizations.
+  if option["opt-experimental"] then    -- experimental
+    optimize_func1()
+    -- WARNING globalinfo and localinfo now invalidated!
+  end
+end
+
+return M

tools/luasrcdiet/plugin/example.lua

@@ -0,0 +1,90 @@
+---------
+-- Example of a plugin for LuaSrcDiet.
+--
+-- WARNING: highly experimental! interface liable to change
+--
+-- **Notes:**
+--
+-- * Any function can be omitted and LuaSrcDiet won't call it.
+-- * The functions are:
+--   (1) init(_option, _srcfl, _destfl)
+--   (2) post_load(z) can return z
+--   (3) post_lex(toklist, seminfolist, toklnlist)
+--   (4) post_parse(globalinfo, localinfo)
+--   (5) post_optparse()
+--   (6) post_optlex(toklist, seminfolist, toklnlist)
+-- * Older tables can be copied and kept in the plugin and used later.
+-- * If you modify 'option', remember that LuaSrcDiet might be
+--   processing more than one file.
+-- * Arrangement of the functions is not final!
+-- * TODO: can't process additional options from command line yet
+----
+
+local M = {}
+
+local option                    -- local reference to list of options
+local srcfl, destfl             -- filenames
+local old_quiet
+
+local function print(...)               -- handle quiet option
+  if option.QUIET then return end
+  _G.print(...)
+end
+
+--- Initialization.
+--
+-- @tparam {[string]=bool,...} _option
+-- @tparam string _srcfl Path of the source file.
+-- @tparam string _destfl Path of the destination file.
+function M.init(_option, _srcfl, _destfl)
+  option = _option
+  srcfl, destfl = _srcfl, _destfl
+  -- plugin can impose its own option starting from here
+end
+
+--- Message display, post-load processing, can return z.
+function M.post_load(z)
+  -- this message will print after the LuaSrcDiet title message
+  print([[
+Example plugin module for LuaSrcDiet
+]])
+  print("Example: source file name is '"..srcfl.."'")
+  print("Example: destination file name is '"..destfl.."'")
+  print("Example: the size of the source file is "..#z.." bytes")
+  -- returning z is optional; this allows optional replacement of
+  -- the source data prior to lexing
+  return z
+end
+
+--- Post-lexing processing, can work on lexer table output.
+function M.post_lex(toklist, seminfolist, toklnlist)  --luacheck: ignore
+  print("Example: the number of lexed elements is "..#toklist)
+end
+
+--- Post-parsing processing, gives globalinfo, localinfo.
+function M.post_parse(globalinfo, localinfo)
+  print("Example: size of globalinfo is "..#globalinfo)
+  print("Example: size of localinfo is "..#localinfo)
+  old_quiet = option.QUIET
+  option.QUIET = true
+end
+
+--- Post-parser optimization processing, can get tables from elsewhere.
+function M.post_optparse()
+  option.QUIET = old_quiet
+  print("Example: pretend to do post-optparse")
+end
+
+--- Post-lexer optimization processing, can get tables from elsewhere.
+function M.post_optlex(toklist, seminfolist, toklnlist)  --luacheck: ignore
+  print("Example: pretend to do post-optlex")
+  -- restore old settings, other file might need original settings
+  option.QUIET = old_quiet
+  -- option.EXIT can be set at the end of any post_* function to stop
+  -- further processing and exit for the current file being worked on
+  -- in this case, final stats printout is disabled and the output will
+  -- not be written to the destination file
+  option.EXIT = true
+end
+
+return M

tools/luasrcdiet/plugin/html.lua

@@ -0,0 +1,177 @@
+---------
+-- Turns Lua 5.1 source code into HTML files.
+--
+-- WARNING: highly experimental! interface liable to change
+--
+-- **Notes:**
+--
+-- * This HTML highlighter marks globals brightly so that their usage
+--   can be manually optimized.
+-- * Either uses a .html extension for output files or it follows the
+--   -o <filespec> option.
+-- * The HTML style tries to follow that of the Lua wiki.
+----
+local fs = require "luasrcdiet.fs"
+
+local concat = table.concat
+local find = string.find
+local fmt = string.format
+local sub = string.sub
+
+local M = {}
+
+local HTML_EXT = ".html"
+local ENTITIES = {
+  ["&"] = "&amp;", ["<"] = "&lt;", [">"] = "&gt;",
+  ["'"] = "&apos;", ["\""] = "&quot;",
+}
+
+-- simple headers and footers
+local HEADER = [[
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+<html>
+<head>
+<title>%s</title>
+<meta name="Generator" content="LuaSrcDiet">
+<style type="text/css">
+%s</style>
+</head>
+<body>
+<pre class="code">
+]]
+local FOOTER = [[
+</pre>
+</body>
+</html>
+]]
+-- for more, please see wikimain.css from the Lua wiki site
+local STYLESHEET = [[
+BODY {
+    background: white;
+    color: navy;
+}
+pre.code { color: black; }
+span.comment { color: #00a000; }
+span.string  { color: #009090; }
+span.keyword { color: black; font-weight: bold; }
+span.number { color: #993399; }
+span.operator { }
+span.name { }
+span.global { color: #ff0000; font-weight: bold; }
+span.local { color: #0000ff; font-weight: bold; }
+]]
+
+local option                    -- local reference to list of options
+local srcfl, destfl             -- filenames
+local toklist, seminfolist  -- token data
+
+local function print(...)               -- handle quiet option
+  if option.QUIET then return end
+  _G.print(...)
+end
+
+--- Initialization.
+function M.init(_option, _srcfl)
+  option = _option
+  srcfl = _srcfl
+  local extb, _ = find(srcfl, "%.[^%.%\\%/]*$")
+  local basename = srcfl
+  if extb and extb > 1 then
+    basename = sub(srcfl, 1, extb - 1)
+  end
+  destfl = basename..HTML_EXT
+  if option.OUTPUT_FILE then
+    destfl = option.OUTPUT_FILE
+  end
+  if srcfl == destfl then
+    error("output filename identical to input filename")
+  end
+end
+
+--- Message display, post-load processing.
+function M.post_load()
+  print([[
+HTML plugin module for LuaSrcDiet
+]])
+  print("Exporting: "..srcfl.." -> "..destfl.."\n")
+end
+
+--- Post-lexing processing, can work on lexer table output.
+function M.post_lex(_toklist, _seminfolist)
+  toklist, seminfolist = _toklist, _seminfolist
+end
+
+--- Escapes the usual suspects for HTML/XML.
+local function do_entities(z)
+  local i = 1
+  while i <= #z do
+    local c = sub(z, i, i)
+    local d = ENTITIES[c]
+    if d then
+      c = d
+      z = sub(z, 1, i - 1)..c..sub(z, i + 1)
+    end
+    i = i + #c
+  end--while
+  return z
+end
+
+--- Post-parsing processing, gives globalinfo, localinfo.
+function M.post_parse(globalinfo, localinfo)
+  local html = {}
+  local function add(s)         -- html helpers
+    html[#html + 1] = s
+  end
+  local function span(class, s)
+    add('<span class="'..class..'">'..s..'</span>')
+  end
+
+  for i = 1, #globalinfo do     -- mark global identifiers as TK_GLOBAL
+    local obj = globalinfo[i]
+    local xref = obj.xref
+    for j = 1, #xref do
+      local p = xref[j]
+      toklist[p] = "TK_GLOBAL"
+    end
+  end--for
+
+  for i = 1, #localinfo do      -- mark local identifiers as TK_LOCAL
+    local obj = localinfo[i]
+    local xref = obj.xref
+    for j = 1, #xref do
+      local p = xref[j]
+      toklist[p] = "TK_LOCAL"
+    end
+  end--for
+
+  add(fmt(HEADER,     -- header and leading stuff
+    do_entities(srcfl),
+    STYLESHEET))
+  for i = 1, #toklist do        -- enumerate token list
+    local tok, info = toklist[i], seminfolist[i]
+    if tok == "TK_KEYWORD" then
+      span("keyword", info)
+    elseif tok == "TK_STRING" or tok == "TK_LSTRING" then
+      span("string", do_entities(info))
+    elseif tok == "TK_COMMENT" or tok == "TK_LCOMMENT" then
+      span("comment", do_entities(info))
+    elseif tok == "TK_GLOBAL" then
+      span("global", info)
+    elseif tok == "TK_LOCAL" then
+      span("local", info)
+    elseif tok == "TK_NAME" then
+      span("name", info)
+    elseif tok == "TK_NUMBER" then
+      span("number", info)
+    elseif tok == "TK_OP" then
+      span("operator", do_entities(info))
+    elseif tok ~= "TK_EOS" then  -- TK_EOL, TK_SPACE
+      add(info)
+    end
+  end--for
+  add(FOOTER)
+  assert(fs.write_file(destfl, concat(html), "wb"))
+  option.EXIT = true
+end
+
+return M

tools/luasrcdiet/plugin/sloc.lua

@@ -0,0 +1,89 @@
+---------
+-- Calculates SLOC for Lua 5.1 scripts
+--
+-- WARNING: highly experimental! interface liable to change
+--
+-- **Notes:**
+--
+-- * SLOC's behaviour is based on David Wheeler's SLOCCount.
+-- * Empty lines and comment don't count as significant.
+-- * Empty lines in long strings are also insignificant. This is
+--   debatable. In SLOCCount, this allows counting of invalid multi-
+--   line strings for C. But an empty line is still an empty line.
+-- * Ignores the --quiet option, print own result line.
+----
+
+local M = {}
+
+local option                    -- local reference to list of options
+local srcfl                     -- source file name
+
+function M.init(_option, _srcfl)
+  option = _option
+  option.QUIET = true
+  srcfl = _srcfl
+end
+
+--- Splits a block into a table of lines (minus EOLs).
+--
+-- @tparam string blk
+-- @treturn {string,...} lines
+local function split(blk)
+  local lines = {}
+  local i, nblk = 1, #blk
+  while i <= nblk do
+    local p, q, r, s = blk:find("([\r\n])([\r\n]?)", i)
+    if not p then
+      p = nblk + 1
+    end
+    lines[#lines + 1] = blk:sub(i, p - 1)
+    i = p + 1
+    if p < nblk and q > p and r ~= s then  -- handle Lua-style CRLF, LFCR
+      i = i + 1
+    end
+  end
+  return lines
+end
+
+--- Post-lexing processing, can work on lexer table output.
+function M.post_lex(toklist, seminfolist, toklnlist)
+  local lnow, sloc = 0, 0
+  local function chk(ln)        -- if a new line, count it as an SLOC
+    if ln > lnow then           -- new line # must be > old line #
+      sloc = sloc + 1; lnow = ln
+    end
+  end
+  for i = 1, #toklist do        -- enumerate over all tokens
+    local tok, info, ln
+      = toklist[i], seminfolist[i], toklnlist[i]
+
+    if tok == "TK_KEYWORD" or tok == "TK_NAME" or       -- significant
+       tok == "TK_NUMBER" or tok == "TK_OP" then
+      chk(ln)
+
+    -- Both TK_STRING and TK_LSTRING may be multi-line, hence, a loop
+    -- is needed in order to mark off lines one-by-one. Since llex.lua
+    -- currently returns the line number of the last part of the string,
+    -- we must subtract in order to get the starting line number.
+    elseif tok == "TK_STRING" then      -- possible multi-line
+      local t = split(info)
+      ln = ln - #t + 1
+      for _ = 1, #t do
+        chk(ln); ln = ln + 1
+      end
+
+    elseif tok == "TK_LSTRING" then     -- possible multi-line
+      local t = split(info)
+      ln = ln - #t + 1
+      for j = 1, #t do
+        if t[j] ~= "" then chk(ln) end
+        ln = ln + 1
+      end
+    -- Other tokens are comments or whitespace and are ignored.
+    end
+  end--for
+  print(srcfl..": "..sloc) -- display result
+  option.EXIT = true
+end
+
+return M

tools/luasrcdiet/utils.lua

@@ -0,0 +1,30 @@
+---------
+-- General utility functions.
+--
+-- **Note: This module is not part of public API!**
+----
+local ipairs = ipairs
+local pairs = pairs
+
+local M = {}
+
+--- Returns a new table containing the contents of all the given tables.
+-- Tables are iterated using @{pairs}, so this function is intended for tables
+-- that represent *associative arrays*. Entries with duplicate keys are
+-- overwritten with the values from a later table.
+--
+-- @tparam {table,...} ... The tables to merge.
+-- @treturn table A new table.
+function M.merge (...)
+  local result = {}
+
+  for _, tab in ipairs{...} do
+    for key, val in pairs(tab) do
+      result[key] = val
+    end
+  end
+
+  return result
+end
+
+return M

tools/luatool.py

@@ -0,0 +1,343 @@
+#!/usr/bin/python
+#
+# ESP8266 luatool
+# Author e-mail: 4ref0nt@gmail.com
+# Site: http://esp8266.ru
+# Contributions from: https://github.com/sej7278
+#
+# This program is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free Software
+# Foundation; either version 2 of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
+# Street, Fifth Floor, Boston, MA 02110-1301 USA.
+# version 0.6.4 based version
+# Version 0.8.0 upgraded to python3
+
+
+import sys
+import serial
+from time import sleep
+import socket
+import argparse
+from os.path import basename
+
+
+version = "0.8.0"
+
+
+class TransportError(Exception):
+    """Custom exception to represent errors with a transport
+    """
+    def __init__(self, message):
+        self.message = message
+
+
+class AbstractTransport:
+    def __init__(self):
+        raise NotImplementedError('abstract transports cannot be instantiated.')
+
+    def close(self):
+        raise NotImplementedError('Function not implemented')
+
+    def read(self, length):
+        raise NotImplementedError('Function not implemented')
+
+    def writeln(self, data, check=1):
+        raise NotImplementedError('Function not implemented')
+
+    def writer(self, data):
+        self.writeln("file.writeline([==[" + data + "]==])\r")
+
+    def execute(self, data):
+        self.writeln(data + "\r")
+
+    def performcheck(self, expected):
+        line = ''
+        char = ''
+        i = -1
+        while (len(char) == 0) or (ord(char) != 62):  # '>'
+            char = self.read(1)
+            #print(ord(char))
+            if char == '':
+                raise Exception('No proper answer from MCU')
+            if ord(char) == 13 or ord(char) == 10:  # LF or CR
+                if line != '':
+                    line = line.strip()
+                    if line+'\r' == expected:
+                        sys.stdout.write(" -> ok")
+                    else:
+                        if line[:4] == "lua:":
+                            sys.stdout.write("\r\n\r\nLua ERROR: %s" % line)
+                            raise Exception('ERROR from Lua interpreter\r\n\r\n')
+                        else:
+                            expected = expected.split("\r")[0]
+                            sys.stdout.write("\r\n\r\nERROR")
+                            sys.stdout.write("\r\n send string    : '%s'" % expected)
+                            sys.stdout.write("\r\n expected echo  : '%s'" % expected)
+                            sys.stdout.write("\r\n but got answer : '%s'" % line)
+                            sys.stdout.write("\r\n\r\n")
+                            raise Exception('Error sending data to MCU\r\n\r\n')
+                    line = ''
+            else:
+                line += char.decode("utf-8")
+                if ord(char) == 62 and expected[i] == char:
+                    char = ''
+                i += 1
+
+
+class SerialTransport(AbstractTransport):
+    def __init__(self, port, baud, delay):
+        self.port = port
+        self.baud = baud
+        self.serial = None
+        self.delay = delay
+
+        try:
+            self.serial = serial.Serial(port, baud)
+        except serial.SerialException as e:
+            raise TransportError(e.strerror)
+
+        self.serial.timeout = 3
+        self.serial.interCharTimeout = 3
+
+    def writeln(self, data, check=1):
+        if self.serial.inWaiting() > 0:
+            self.serial.flushInput()
+        if len(data) > 0:
+            sys.stdout.write("\r\n->")
+            sys.stdout.write(data.split("\r")[0])
+        self.serial.write(str.encode(data))
+        sleep(self.delay)
+        if check > 0:
+            self.performcheck(data)
+        else:
+            sys.stdout.write(" -> send without check")
+
+    def read(self, length):
+        return self.serial.read(length)
+
+    def close(self):
+        self.serial.flush()
+        self.serial.close()
+
+
+class TcpSocketTransport(AbstractTransport):
+    def __init__(self, host, port):
+        self.host = host
+        self.port = port
+        self.socket = None
+
+        try:
+            self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+        except socket.error as e:
+            raise TransportError(e.strerror)
+
+        try:
+            self.socket.connect((host, port))
+        except socket.error as e:
+            raise TransportError(e.strerror)
+        # read intro from telnet server (see telnet_srv.lua)
+        self.socket.recv(50)
+
+    def writeln(self, data, check=1):
+        if len(data) > 0:
+            sys.stdout.write("\r\n->")
+            sys.stdout.write(data.split("\r")[0])
+        self.socket.sendall(str.encode(data))
+        if check > 0:
+            self.performcheck(data)
+        else:
+            sys.stdout.write(" -> send without check")
+
+    def read(self, length):
+        return self.socket.recv(length)
+
+    def close(self):
+        self.socket.close()
+
+
+def decidetransport(cliargs):
+    if cliargs.ip:
+        data = cliargs.ip.split(':')
+        host = data[0]
+        if len(data) == 2:
+            port = int(data[1])
+        else:
+            port = 23
+        return TcpSocketTransport(host, port)
+    else:
+        return SerialTransport(cliargs.port, cliargs.baud, cliargs.delay)
+
+
+if __name__ == '__main__':
+    # parse arguments or use defaults
+    parser = argparse.ArgumentParser(description='ESP8266 Lua script uploader.')
+    parser.add_argument('-p', '--port',    default='/dev/ttyUSB0', help='Device name, default /dev/ttyUSB0')
+    parser.add_argument('-b', '--baud',    default=9600,           help='Baudrate, default 9600')
+    parser.add_argument('-f', '--src',     default='main.lua',     help='Source file on computer, default main.lua')
+    parser.add_argument('-t', '--dest',    default=None,           help='Destination file on MCU, default to source file name')
+    parser.add_argument('-c', '--compile', action='store_true',    help='Compile lua to lc after upload')
+    parser.add_argument('-r', '--restart', action='store_true',    help='Restart MCU after upload')
+    parser.add_argument('-d', '--dofile',  action='store_true',    help='Run the Lua script after upload')
+    parser.add_argument('-v', '--verbose', action='store_true',    help="Show progress messages.")
+    parser.add_argument('-a', '--append',  action='store_true',    help='Append source file to destination file.')
+    parser.add_argument('-l', '--list',    action='store_true',    help='List files on device')
+    parser.add_argument('-w', '--wipe',    action='store_true',    help='Delete all lua/lc files on device.')
+    parser.add_argument('-i', '--id',      action='store_true',    help='Query the modules chip id.')
+    parser.add_argument('-e', '--echo',    action='store_true',    help='Echo output of MCU until script is terminated.')
+    parser.add_argument('--delay',         default=0.3,            help='Delay in seconds between each write.', type=float)
+    parser.add_argument('--delete',        default=None,           help='Delete a lua/lc file from device.')
+    parser.add_argument('--volatile',      action='store_true',    help='Volatile (nothing stored on ESP)')
+    parser.add_argument('--ip',            default=None,           help='Connect to a telnet server on the device (--ip IP[:port])')
+    args = parser.parse_args()
+
+    transport = decidetransport(args)
+
+    if args.list:
+        transport.writeln("local l = file.list();for k,v in pairs(l) do print('name:'..k..', size:'..v)end\r", 0)
+        while True:
+            char = transport.read(1)
+            if char == '' or char == chr(62):
+                break
+            sys.stdout.write(str.encode(char))
+        sys.exit(0)
+
+    if args.id:
+        transport.writeln("=node.chipid()\r", 0)
+        id=""
+        while True:
+            char = transport.read(1)
+            if char == '' or char == chr(62):
+                break
+            if char.isdigit():
+                id += char.decode("utf-8")
+        print("\n"+id)
+        sys.exit(0)
+
+    if args.wipe:
+        transport.writeln("local l = file.list();for k,v in pairs(l) do print(k)end\r", 0)
+        file_list = []
+        fn = ""
+        while True:
+            char = transport.read(1)
+            if char == '' or len(char) == 0 or ord(char) == 62:
+                break
+            if char not in ['\r', '\n']:
+                fn += str(char)
+            else:
+                if fn:
+                    file_list.append(fn.strip())
+                fn = ''
+        for fn in file_list[1:]:  # first line is the list command sent to device
+            if args.verbose:
+                sys.stderr.write("Delete file {} from device.\r\n".format(fn))
+            transport.writeln("file.remove(\"" + fn + "\")\r")
+        sys.exit(0)
+
+    if args.delete:
+        transport.writeln("file.remove(\"" + args.delete + "\")\r")
+        sys.exit(0)
+
+    if args.dest is None:
+        args.dest = basename(args.src)
+
+    # open source file for reading
+    try:
+        f = open(args.src, "rt")
+    except:
+        sys.stderr.write("Could not open input file \"%s\"\n" % args.src)
+        sys.exit(1)
+
+    # Verify the selected file will not exceed the size of the serial buffer.
+    # The size of the buffer is 256. This script does not accept files with
+    # lines longer than 230 characters to have some room for command overhead.
+    for ln in f:
+        if len(ln) > 230:
+            sys.stderr.write("File \"%s\" contains a line with more than 240 "
+                             "characters. This exceeds the size of the serial buffer.\n"
+                             % args.src)
+            f.close()
+            sys.exit(1)
+
+    # Go back to the beginning of the file after verifying it has the correct
+    # line length
+    f.seek(0)
+
+    # set serial timeout
+    if args.verbose:
+        sys.stderr.write("Upload starting\r\n")
+
+    # remove existing file on device
+    if args.append==False and not args.volatile:
+        if args.verbose:
+            sys.stderr.write("Stage 1. Deleting old file from flash memory")
+        transport.writeln("file.open(\"" + args.dest + "\", \"w\")\r")
+        transport.writeln("file.close()\r")
+        transport.writeln("file.remove(\"" + args.dest + "\")\r")
+    else:
+        if args.verbose:
+            sys.stderr.write("[SKIPPED] Stage 1. Deleting old file from flash memory [SKIPPED]")
+
+
+    # read source file line by line and write to device
+    if args.verbose:
+        sys.stderr.write("\r\nStage 2. Creating file in flash memory and write first line")
+    if not args.volatile:
+        if args.append:
+            transport.writeln("file.open(\"" + args.dest + "\", \"a+\")\r")
+        else:
+            transport.writeln("file.open(\"" + args.dest + "\", \"w+\")\r")
+    else:
+        if args.verbose:
+            sys.stderr.write("\r\nStage 2. Directly execute the script...")
+    line = f.readline()
+    if args.verbose:
+        sys.stderr.write("\r\nStage 3. Start writing data to flash memory...")
+    while line != '':
+        if args.volatile:
+            transport.execute(line.strip())
+        else:
+            transport.writer(line.strip())
+        line = f.readline()
+
+    # close both files
+    f.close()
+    if args.verbose:
+        sys.stderr.write("\r\nStage 4. Flush data and closing file")
+    if not args.volatile:
+        transport.writeln("file.flush()\r")
+        transport.writeln("file.close()\r")
+
+    # compile?
+    if args.compile:
+        if args.verbose:
+            sys.stderr.write("\r\nStage 5. Compiling")
+        transport.writeln("node.compile(\"" + args.dest + "\")\r")
+        transport.writeln("file.remove(\"" + args.dest + "\")\r")
+
+    # restart or dofile
+    if args.restart:
+        transport.writeln("node.restart()\r")
+    if args.dofile:   # never exec if restart=1
+        transport.writeln("dofile(\"" + args.dest + "\")\r", 0)
+
+    if args.echo:
+        if args.verbose:
+            sys.stderr.write("\r\nEchoing MCU output, press Ctrl-C to exit")
+        while True:
+            data = transport.read(1)
+            sys.stdout.write( data.decode("ascii") )
+
+    # close serial port
+    transport.close()
+
+    # flush screen
+    sys.stdout.flush()
+    sys.stderr.flush()
+    sys.stderr.write("\r\n--->>> All done <<<---\r\n")

tools/remoteFlash.sh

@@ -0,0 +1,103 @@
+#!/bin/bash
+
+MQTTSERVER=$1
+MQTTPREFIX=$2
+CUSTOMFILE=$3
+
+FLASHTOOL=./tools/tcpFlash.py
+TOOLDIR=tools/
+DIET=bin/luasrcdiet
+
+UPGRADEPREP=/tmp/upgradeCMD4clock.txt
+
+if [ ! -f $FLASHTOOL ]; then
+ echo "Execute the script in root folder of the project"
+ exit 2
+fi
+
+if [[ "$MQTTPREFIX" == "" ]] || [[ "$MQTTSERVER" == "" ]]; then
+ echo "MQTTSERVER: ip address to mqtt server"
+ echo "MQTTPREFIX: configured prefex in MQTT of ESP required"
+ echo "usage:"
+ echo "$0 <MQTTSERVER> <MQTTPREFIX>"
+ echo "$0 192.168.0.2 basetopic"
+ exit 1
+fi
+
+# Prepare all files on host
+if [[ "$CUSTOMFILE" == "" ]]; then
+	FILES="displayword.lua main.lua timecore.lua webpage.html webserver.lua wordclock.lua init.lua"
+	echo "Start Flasing ..."
+else
+	FILES=$CUSTOMFILE
+	echo "Start Flasing $FILES ..."
+fi
+
+
+# Convert files, if necessary
+if [ "$FILES" != "config.lua" ]; then
+        echo "Generate DIET version of the files"
+        OUTFILES=""
+        ROOTDIR=$PWD
+        cd $TOOLDIR
+        for f in $FILES; do
+                if [[ "$f" == *.lua ]] && [[ "$f" != init.lua ]]; then
+                        echo "Compress $f ..."
+                        out=$(echo "$f" | sed 's/.lua/_diet.lua/g')
+                        $DIET ../$f -o ../diet/$out >> /dev/null
+                        OUTFILES="$OUTFILES diet/$out"
+                else
+                        OUTFILES="$OUTFILES $f"
+                fi
+        done
+        FILES=$OUTFILES
+        cd $ROOTDIR
+fi
+
+
+# check the connection
+echo "Searching $MQTTPREFIX ..."
+mosquitto_sub -h $MQTTSERVER -t "$MQTTPREFIX/#" -C 1 -v
+if [ $? -ne 0 ]; then
+ echo "Entered Wordclock address: $MQTTPREFIX on $MQTTSERVER is NOT online"
+ exit 2
+fi
+echo "Activate Telnet server ..."
+TELNETIP="empty"
+while [ "$TELNETIP" = "empty" ]; do
+ date
+ mosquitto_pub -h $MQTTSERVER -t "$MQTTPREFIX/cmd/telnet" -m "a"
+ TELNETIP=$(mosquitto_sub -h $MQTTSERVER -t "$MQTTPREFIX/telnet" -C 1 -W 30)
+done
+
+echo "Upgrading $MQTTPREFIX via telenet on $TELNETIP ..."
+sleep 1
+echo "if (mlt ~= nil) then mlt:unregister() end" > $UPGRADEPREP
+echo "uart.write(0, tostring(node.heap())" >> $UPGRADEPREP
+echo "collectgarbage()"  >> $UPGRADEPREP
+echo "" >> $UPGRADEPREP
+echo "download = string.char(0,0,64)"  >> $UPGRADEPREP
+echo "w = string.char(0,0,0)"  >> $UPGRADEPREP
+echo "ws2812.write(w:rep(4) .. download .. w:rep(15) .. download .. w:rep(9) .. download .. w:rep(30) .. download .. w:rep(41) .. download )"  >> $UPGRADEPREP
+echo "collectgarbage()"  >> $UPGRADEPREP
+$FLASHTOOL -f $UPGRADEPREP -t $TELNETIP -v
+
+for f in $FILES; do
+    if [ ! -f $f ]; then
+        echo "Cannot find $f"
+        echo "place the terminal into the folder where the lua files are present"
+        exit 1
+    fi
+    espFile=$(echo "$f" | sed 's;diet/;;g')
+    echo "------------- $espFile ------------"
+    $FLASHTOOL -t $TELNETIP -f $f -o $espFile
+    if [ $? -ne 0 ]; then
+        echo "STOOOOP"
+        exit 1
+    fi
+done
+
+echo "TODO: Reboot the ESP"
+#echo "node.restart()" | nc $TELNETIP 23
+
+exit 0

tools/stopController.lua

@@ -0,0 +1,2 @@
+node.restart()
+if (initTimer ~= nil) then initTimer:unregister() end

tools/tcpFlash.py

@@ -0,0 +1,155 @@
+#!/usr/bin/python
+
+import argparse
+import socket
+import os.path
+import sys      #for exit and flushing of stdout
+import time
+
+def sendRecv(s, message, answer):
+    msg = message + "\n"
+    s.sendall(msg)
+    reply = s.recv(4096)
+    i=1
+    while ((not (answer in reply)) and (i < 10)):
+        reply += s.recv(4096)
+        i = i + 1
+    if answer not in reply:
+        return False
+    else:
+        return True
+
+def sendCmd(s, message, cleaningEnter=False):
+    msg = message + "\n"
+    s.sendall(msg)
+    time.sleep(0.050)
+    reply = s.recv(4096)
+    i=1
+    while ((not (">" in reply)) and (i < 10)):
+        time.sleep((0.050) * i)
+        reply += s.recv(4096)
+        i = i + 1
+
+#    print "Send\t" + message
+#    print "Got\t" + reply
+    if (cleaningEnter):
+        s.sendall("\n")
+    if "stdin:1:" in reply:
+       print "ERROR, received : " + reply
+       return False
+    elif ">" in reply:
+        return True
+    else:
+        print "ERROR, received : " + reply
+        return False
+
+def main(nodeip, luafile, volatile=None, outfile=None):
+    if ( not os.path.isfile(luafile) ):
+        print "The file " + luafile + " is not available"
+    else:
+        try:
+            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+            s.connect((nodeip, 23))
+	    time.sleep(0.050)
+            s.sendall("\n")
+            # Receive the hello Message of answer of the ESP
+            if (not sendRecv(s, "\n", "Welcome to ") ):
+                print "Cannot connect to the ESP"
+                s.close()
+                sys.exit(2)
+            
+            # Read all lines from the welcome message
+            i=0
+            reply = s.recv(4096)
+            while ((reply is not None) and (not (">" in reply)) and (i < 100)):
+                reply = s.recv(4096)
+                i = i + 1
+
+
+            # Communication tests
+            if ( not sendRecv(s, "print(12345)", "12345") ):
+                print "NOT communicating with an ESP8266 running LUA (nodemcu) firmware"
+                s.close()
+                sys.exit(3)
+             
+            if (volatile is None):
+                if (outfile is None):
+                    print "Flashing " + luafile
+                    outfile=luafile
+                else:
+                    print "Flashing " + luafile + " as " + outfile
+                sendCmd(s, "w= file.writeline", True)
+                sendCmd(s, "file.open(\"temp.lua\",\"w+\");", True)
+            else:
+                print "Executing " + luafile + " on nodemcu"
+
+            with open(luafile) as f:
+                contents = f.readlines()
+                i=1
+                for line in contents:
+                    print "\rSending " + str(i) + "/" + str(len(contents)) + " ...",
+                    sys.stdout.flush()
+                    l = line.rstrip()
+		    if ( l.endswith("]") ):
+			l = l + " "
+			print "add a space at the end"
+
+                    if (volatile is None):
+                        if (not sendCmd(s, "w([==[" + l + "]==]);")):
+                            print "Cannot write line " + str(i)
+                            s.close()
+                            sys.exit(4)
+                    else:
+                        if (not sendCmd(s, l)):
+                            print "Cannot write line " + str(i)
+                            s.close()
+                            sys.exit(4)
+                    i=i+1
+
+            if (volatile is None):
+                # Finished with updating the file in LUA
+                if (not sendCmd(s, "w([[" + "--EOF" + "]]);")):
+                    print "Cannot write line " + "-- EOF"
+                if (not sendCmd(s, "file.close();")):
+                    print "Cannot close the file"
+                    sys.exit(4)
+
+                sendCmd(s, "file.remove(\"" + outfile +"\");", True)
+                if (not sendCmd(s, "file.rename(\"temp.lua\",\""+ outfile + "\")")):
+                    print "Cannot move temporary file to " + outfile
+
+                
+                # Check if the file exists:
+                if (not sendRecv(s, "=file.exists(\"" + outfile + "\")", "true")):
+                    print("Cannot send " + outfile + " to the ESP")
+                    sys.exit(4)
+                else:
+                    print("Updated " + outfile + " successfully")
+            else:
+                print("Send " + luafile + " successfully")
+
+            # Cleaning the socket by closing it
+            s.close()
+            sys.exit(0) # Report that the flashing was succesfull
+        except socket.error, msg:
+            print 'Failed to create socket. Error code: ' + str(msg[0]) + ' , Error message : ' + msg[1]
+            sys.exit(1)
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-t', '--target', help='IP address or dns of the ESP to flash')
+    parser.add_argument('-f', '--file', help='LUA file, that should be updated')
+    parser.add_argument('-o', '--outfile', help='LUA file name on the microcontroller (default: same name as on host)')
+    parser.add_argument('-v', '--volatile', help='File is executed at the commandline', action='store_const', const=1)
+
+    args = parser.parse_args()
+    if (args.target and args.file and args.volatile and args.outfile):
+        main(args.target, args.file, args.volatile, args.outfile)
+    elif (args.target and args.file and args.outfile):
+         main(args.target, args.file, None, args.outfile)
+    elif (args.target and args.file and args.volatile):
+       main(args.target, args.file, args.volatile)
+    elif (args.target and args.file):
+        main(args.target, args.file)
+    else:
+        parser.print_help()

unit/testWordClock.lua

@@ -1,6 +1,7 @@
 -- Example usage of the word clock
 dofile("../wordclock.lua")
 
+print "------- Manual test ----"
 -- Manually set something
 leds=display_timestat(15,30)
 for k,v in pairs(leds) do 
@@ -8,6 +9,7 @@ for k,v in pairs(leds) do
         print(k) 
     end
 end
+print "---------------------"
 
 function checkWords(leds, expected, hour, min)
   for k, v in pairs(leds) do
@@ -34,6 +36,19 @@ function checkWords(leds, expected, hour, min)
   print(hour .. ":" .. min)
 end
 
+function checkCharacter(words, expected)
+    if (words == nil or expected == nil) then
+     print("Not all parameter set to checkCharacter")
+     os.exit(1)
+    end
+    if (words ~= expected) then
+        print("Not all character found. Expected " .. expected .. ", but found " .. words)
+        os.exit(1)
+    end
+end
+
+print ""
+print "----------- Unit tests -------------"
 -- Unit tests
 leds=display_timestat(1,0)
 expected={}
@@ -65,10 +80,9 @@ checkWords(leds, expected, 4 , 15)
 
 leds=display_timestat(5,20)
 expected={}
-expected.six=1
-expected.tenMin=1
-expected.before=1
-expected.half=1
+expected.five=1
+expected.twenty=1
+expected.after=1
 checkWords(leds, expected, 5 , 20)
 
 leds=display_timestat(6,25)
@@ -97,9 +111,8 @@ checkWords(leds, expected, 8 , 35)
 leds=display_timestat(9,40)
 expected={}
 expected.ten=1
-expected.half=1
-expected.tenMin=1
-expected.after=1
+expected.twenty=1
+expected.before=1
 checkWords(leds, expected, 9 , 40)
 
 leds=display_timestat(10,45)
@@ -118,7 +131,7 @@ checkWords(leds, expected, 11 , 50)
 
 leds=display_timestat(12,55)
 expected={}
-expected.one=1
+expected.oneLong=1
 expected.fiveMin=1
 expected.before=1
 checkWords(leds, expected, 12 , 55)

webpage.html

@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html><head><title>WordClock Setup Page</title>
+<style type="text/css">
+#table-6 {
+width: 100%
+border: 1px solid #B0B0B0;
+}
+#table-6 tbody {
+/* Kind of irrelevant unless your .css is alreadt doing something else */
+margin: 0;
+padding: 0;
+border: 0;
+outline: 0;
+font-size: 100%;
+vertical-align: baseline;
+background: transparent;
+}
+#table-6 thead {
+text-align: left;<tr><th>Three quater</th><td><input type="checkbox" name="threequater" ></td><td>Dreiviertel Joa/nei</td></tr>
+
+}
+#table-6 thead th {
+background: -moz-linear-gradient(top, #F0F0F0 0, #DBDBDB 100%);
+background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #F0F0F0), color-stop(100%, #DBDBDB));
+filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#F0F0F0', endColorstr='#DBDBDB', GradientType=0);
+border: 1px solid #B0B0B0;
+color: #444;
+font-size: 16px;
+font-weight: bold;
+padding: 3px 10px;
+}
+#table-6 td {
+padding: 3px 10px;
+
+}
+#table-6 tr:nth-child(even) {
+background: #F2F2F2;
+}
+</style></head>
+<body>
+<h1>Welcome to the WordClock</h1>
+<h2>Initial Setup</h2>
+Please note that all settings are mandatory<br /><br />
+<form action="/" method="POST">
+<table id="table-6">
+<tr><th><b>WIFI-SSID</b></th><td><input id="ssid" name="ssid" value="$SSID"></td><td>SSID of the wireless network</td></tr>
+<tr><th>WIFI-Password</th><td><input id="password" name="password"></td><td>Password of the wireless network</td></tr>
+<tr><th>SNTP Server</th><td><input id="sntpserver" name="sntpserver" value="$SNTPSERVER"></td><td>Server to sync the time with. Only one ntp server is allowed.</td></tr> 
+<tr><th>Offset to UTC time</th><td><input id="timezoneoffset" name="timezoneoffset" value="$TIMEOFFSET"></td><td>Define the offset to UTC time in hours. For example +1 hour for Germany</td></tr>
+<tr><th>General Foreground Color</th><td><input type="color" name="fcolor" value="$HEXCOLORFG"></td><td>LED Color for all minutes, divisible by five</td></tr>
+<tr><th>Foreground Color Minute1</th><td><input type="color" name="mcolor1" value="$HEXCOLOR1"></td><td>LED Color for first single minute</td></tr>
+<tr><th>Foreground Color Minute2</th><td><input type="color" name="mcolor2" value="$HEXCOLOR2"></td><td>LED Color for second single minute</td></tr>
+<tr><th>Foreground Color Minute3</th><td><input type="color" name="mcolor3" value="$HEXCOLOR3"></td><td>LED Color for third single minute</td></tr>
+<tr><th>Foreground Color Minute4</th><td><input type="color" name="mcolor4" value="$HEXCOLOR4"></td><td>LED Color for fourth single minute</td></tr>
+<tr><th>Threequarter</th><td><input type="checkbox" name="threequarter" $THREEQUATER></td><td>3/4 instead of 1/4 before</td></tr>
+<tr><th>Adjust brightness</th><td><input type="checkbox" name="dim" $AUTODIM></td><td>Dim brightness automatically</td></tr>
+<input type="hidden" value="true" name="web" /><!-- Activate Webserver only -->
+<tr><td colspan="3"><div align="center"><input type="submit" value="Save Configuration" onclick="this.value='Submitting ..';this.disabled='disabled'; this.form.submit();"></div></td></tr>
+<tr><td colspan="3"><div align="center"><input type="submit" name="action" value="Reboot"></div></td></tr>
+</table>
+</form>
+$ADDITIONAL_LINE
+</body>
+</html>

webserver.lua

@@ -0,0 +1,308 @@
+-- Webserver
+local configFile="config.lua"
+local httpSending=false
+local sentBytes=0
+
+-- Source https://stackoverflow.com/questions/28916182/parse-parameters-out-of-url-in-lua#28921280
+function urldecode(s)
+  s = s:gsub('+', ' ')
+       :gsub('%%(%x%x)', function(h)
+                           return string.char(tonumber(h, 16))
+                         end)
+  return s
+end
+
+function sendPage(conn, nameOfFile, replaceMap)
+  collectgarbage()
+  print("Sending " .. nameOfFile .. " " .. sentBytes .. "B already; " .. node.heap() .. "B in heap")
+  if (sentBytes == 0) then
+    -- print status status
+    local statusColor=string.char(0,128,0)
+    if ((inv46 ~= nil) and (inv46 == "on")) then
+        ws2812.write(string.char(0,0,0):rep(55) .. statusColor:rep(2) .. string.char(0,0,0):rep(5) .. statusColor .. string.char(0,0,0):rep(49))
+    else
+        ws2812.write(string.char(0,0,0):rep(57) .. statusColor .. string.char(0,0,0):rep(5) .. statusColor:rep(2) .. string.char(0,0,0):rep(49))
+    end
+  end
+  conn:on("sent", function(conn) 
+    if (sentBytes == 0) then
+        conn:close() 
+        print("Page sent")
+        collectgarbage()
+        httpSending=false
+    else
+        collectgarbage()
+        sendPage(conn, nameOfFile, replaceMap)
+    end
+  end)
+
+  if file.open(nameOfFile, "r") then
+    local buf=""
+    if (sentBytes <= 0) then
+        buf=buf .. "HTTP/1.1 200 OK\r\n"
+        buf=buf .. "Content-Type: text/html\r\n"
+        buf=buf .. "Connection: close\r\n"
+        buf=buf .. "Date: Thu, 29 Dec 2016 20:18:20 GMT\r\n"
+        buf=buf .. "\r\n\r\n"
+    end
+    -- amount of sent bytes is always zero at the beginning (so no problem)
+    file.seek("set", sentBytes)
+    
+    local line = file.readline()
+    
+    while (line ~= nil) do
+         -- increase the amount of sent bytes
+        sentBytes=sentBytes+string.len(line)
+
+        -- all placeholder begin with a $, so search for it in the current line
+        if (line:find("$") ~= nil) then
+            -- Replace the placeholder with the dynamic content
+            if (replaceMap ~= nil) then
+                for key,value in pairs(replaceMap) 
+                do 
+                    line = string.gsub(line, key, value)
+                end
+            end
+        end
+        
+        buf = buf .. line
+        
+        -- Sent after 500 bytes data
+        if ( (string.len(buf) >= 500) or (node.heap() < 2000) ) then
+            line=nil
+            conn:send(buf)
+            print("Sent part of " .. sentBytes .. "B")
+            -- end the function, this part is sent
+            return 
+        else
+            -- fetch the next line
+            line = file.readline()
+        end
+    end
+    --reset amount of sent bytes, as we reached the end
+    sentBytes=0
+    -- send the rest
+    if (string.len(buf) > 0) then
+        conn:send(buf)
+        print("Sent rest")
+        -- print status status
+        local statusColor=string.char(128,0,0)
+        if ((inv46 ~= nil) and (inv46 == "on")) then
+            ws2812.write(string.char(0,0,0):rep(55) .. statusColor:rep(2) .. string.char(0,0,0):rep(5) .. statusColor .. string.char(0,0,0):rep(49))
+        else
+            ws2812.write(string.char(0,0,0):rep(57) .. statusColor .. string.char(0,0,0):rep(5) .. statusColor:rep(2) .. string.char(0,0,0):rep(49))
+        end
+    end
+  end
+end
+
+function fillDynamicMap()    
+    replaceMap = {}
+    ssid, _ = wifi.sta.getconfig()
+    if (ssid == nil) then return replaceMap end
+    if (sntpserverhostname == nil) then sntpserverhostname="ptbtime1.ptb.de" end
+    if (timezoneoffset == nil) then timezoneoffset=1 end
+    -- Set the default color, if nothing is set
+    if (color == nil) then color=string.char(0,0,250) end
+    if (color1 == nil) then color1=color end
+    if (color2 == nil) then color2=color end
+    if (color3 == nil) then color3=color end
+    if (color4 == nil) then color4=color end
+    if (colorBg == nil) then colorBg=string.char(0,0,0) end
+    local hexColor = "#" .. string.format("%02x",string.byte(color,2)) .. string.format("%02x",string.byte(color,1)) .. string.format("%02x",string.byte(color,3))
+    local hexColor1 = "#" .. string.format("%02x",string.byte(color1,2)) .. string.format("%02x",string.byte(color1,1)) .. string.format("%02x",string.byte(color1,3))
+    local hexColor2 = "#" .. string.format("%02x",string.byte(color2,2)) .. string.format("%02x",string.byte(color2,1)) .. string.format("%02x",string.byte(color2,3))
+    local hexColor3 = "#" .. string.format("%02x",string.byte(color3,2)) .. string.format("%02x",string.byte(color3,1)) .. string.format("%02x",string.byte(color3,3))
+    local hexColor4 = "#" .. string.format("%02x",string.byte(color4,2)) .. string.format("%02x",string.byte(color4,1)) .. string.format("%02x",string.byte(color4,3))
+    local hexColorBg = "#" .. string.format("%02x",string.byte(colorBg,2)) .. string.format("%02x",string.byte(colorBg,1)) .. string.format("%02x",string.byte(colorBg,3))
+
+    replaceMap["$SSID"]=ssid
+    replaceMap["$SNTPSERVER"]=sntpserverhostname
+    replaceMap["$TIMEOFFSET"]=timezoneoffset
+    replaceMap["$THREEQUATER"]=(threequater and "checked" or "")
+    replaceMap["$ADDITIONAL_LINE"]=""
+    replaceMap["$HEXCOLORFG"]=hexColor
+    replaceMap["$HEXCOLOR1"]=hexColor1
+    replaceMap["$HEXCOLOR2"]=hexColor2
+    replaceMap["$HEXCOLOR3"]=hexColor3
+    replaceMap["$HEXCOLOR4"]=hexColor4
+    replaceMap["$HEXCOLORBG"]=hexColorBg
+    replaceMap["$INV46"]=((inv46 ~= nil and inv46 == "on") and "checked" or "")
+    replaceMap["$AUTODIM"]=((dim ~= nil and dim == "on") and "checked" or "")
+    return replaceMap   
+end
+
+function readHex(source, variable)
+	local hexColor=string.sub(source, 4)
+	local red = tonumber(string.sub(hexColor, 1, 2), 16)
+	local green = tonumber(string.sub(hexColor, 3, 4), 16)
+	local blue = tonumber(string.sub(hexColor, 5, 6), 16)
+	file.write(variable.."=string.char(" .. green .. "," .. red .. "," .. blue .. ")\n")
+end
+
+function startWebServer()
+ srv=net.createServer(net.TCP)
+ srv:listen(80,function(conn)
+  conn:on("receive", function(conn,payload)
+   if (httpSending) then
+     print("HTTP sending... be patient!")
+     return
+   end
+   if (payload:find("GET /") ~= nil) then
+    httpSending=true
+   if (color == nil) then
+        color=string.char(0,128,0)
+    end    
+    if (sendPage ~= nil) then
+       print("Sending webpage.html (" .. tostring(node.heap()) .. "B free) ...")
+       mydofile("config")
+       -- Load the sendPagewebcontent
+       replaceMap=fillDynamicMap()
+       sendPage(conn, "webpage.html", replaceMap)
+    end
+   else if (payload:find("POST /") ~=nil) then
+    --code for handling the POST-request (updating settings)
+     _, postdatastart = payload:find("\r\n\r\n")
+     --Next lines catches POST-requests without POST-data....
+     if postdatastart==nil then postdatastart = 1 end
+     local postRequestData=string.sub(payload,postdatastart+1)
+     local _POST = {}
+     for i, j in string.gmatch(postRequestData, "(%w+)=([^&]+)&*") do
+       _POST[i] = j
+     end
+
+     --- Do the magic!
+     if (_POST.action ~= nil and _POST.action == "Reboot") then
+        node.restart()
+        return
+     end
+
+    if ((_POST.ssid~=nil) and (_POST.sntpserver~=nil) and (_POST.timezoneoffset~=nil)) then
+        print("New config!")
+        if (_POST.password==nil) then
+            _, password, _, _ = wifi.sta.getconfig()
+            print("Restoring password : " .. password)
+            _POST.password = password
+            password = nil
+        end
+        -- Safe configuration:
+        file.remove(configFile .. ".new")
+        sec, _ = rtctime.get()
+        file.open(configFile.. ".new", "w+")
+          file.write("-- Config\n" .. "station_cfg={}\nstation_cfg.ssid='" .. urldecode(_POST.ssid) .. "'\nstation_cfg.pwd='" .. urldecode(_POST.password) .. "'\nstation_cfg.save=false\nwifi.sta.config(station_cfg)\n")
+          file.write("sntpserverhostname=\"" .. _POST.sntpserver .. "\"\n" .. "timezoneoffset=\"" .. _POST.timezoneoffset .. "\"\n".. "inv46=nil\n")
+        
+        if ( _POST.fcolor ~= nil) then
+            -- color=string.char(_POST.green, _POST.red, _POST.blue)  
+            print ("Got fcolor: " .. _POST.fcolor)
+	    readHex(_POST.fcolor, "color")
+        end
+        if ( _POST.mcolor1  ~= nil) then
+	    readHex(_POST.mcolor1, "color1")
+        end
+        if ( _POST.mcolor2  ~= nil) then
+	    readHex(_POST.mcolor2, "color2")
+        end
+        if ( _POST.mcolor3  ~= nil) then
+	    readHex(_POST.mcolor3, "color3")
+        end
+        if ( _POST.mcolor4  ~= nil) then
+	    readHex(_POST.mcolor4, "color4")
+        end
+        if ( _POST.bcolor  ~= nil) then
+            local hexColor=string.sub(_POST.bcolor, 4)
+	    readHex(_POST.bcolor, "colorBg")
+        end
+        if (getTime ~= nil) then
+            time = getTime(sec, timezoneoffset)
+            file.write("print(\"Config from " .. time.year .. "-" .. time.month .. "-" .. time.day .. " " .. time.hour .. ":" .. time.minute .. ":" .. time.second .. "\")\n")
+        end
+	    if (_POST.web ~= nil) then
+            file.write("web=true\n")
+            -- fill the current values
+            web=true
+        else
+            file.write("web=nil\n") -- use webserver instead of mqtt or telnet
+            -- fill the current values
+            web=nil
+        end
+        if (_POST.dim ~= nil) then
+            file.write("dim=\"" .. tostring(_POST.dim) .. "\"\n")
+        else
+            file.write("dim=nil\n") -- unset dimming functionality
+        end
+        if (_POST.threequater ~= nil) then
+            file.write("threequater=true\n")
+            -- fill the current values
+            threequater=true
+        else
+            file.write("threequater=nil\n") -- unset threequater
+            -- fill the current values
+            threequater=nil
+        end
+        file.close()
+        collectgarbage()
+        sec=nil
+        file.remove(configFile)
+        print("Rename config")
+        if (file.rename(configFile .. ".new", configFile)) then
+            print("Successfully")
+	    local mytimer = tmr.create()
+	    mytimer:register(50, tmr.ALARM_SINGLE, function (t)
+		mydofile("config")
+                replaceMap=fillDynamicMap()
+                replaceMap["$ADDITIONAL_LINE"]="<h2><font color=\"green\">New configuration saved</font></h2>"
+                print("Send success to client")
+                sendPage(conn, "webpage.html", replaceMap)
+		t:unregister()
+            end)
+	    mytimer:start()
+        else
+	    local mytimer = tmr.create()
+	    mytimer:register(50, tmr.ALARM_SINGLE, function (t)
+                replaceMap=fillDynamicMap()
+                replaceMap["$ADDITIONAL_LINE"]="<h2><font color=\"red\">ERROR</font></h2>"
+                sendPage(conn, "webpage.html", replaceMap)
+		t:unregister()
+            end)
+	    mytimer:start()
+        end
+  else
+      replaceMap=fillDynamicMap()
+      replaceMap["$ADDITIONAL_LINE"]="<h2><font color=\"orange\">Not all parameters set</font></h2>"
+      sendPage(conn, "webpage.html", replaceMap)
+  end
+    else
+     print("Hello via telnet")
+     --here is code, if the connection is not from a webbrowser, i.e. telnet or nc
+     global_c=conn
+     function s_output(str)
+      if(global_c~=nil)
+        then global_c:send(str)
+      end
+     end    
+     node.output(s_output, 0)
+     global_c:on("receive",function(c,l)
+       node.input(l)
+     end)
+     global_c:on("disconnection",function(c)
+       node.output(nil)
+       global_c=nil
+     end)
+     print("Welcome to Word Clock") 
+    end
+   end
+   end)
+  conn:on("disconnection", function(c)
+          print("Goodbye")
+          node.output(nil)        -- un-register the redirect output function, output goes to serial
+          collectgarbage()
+          --reset amount of sent bytes, as we reached the end
+          sentBytes=0
+       end)
+ end)
+
+end
+
+startWebServer()
+collectgarbage()

wlancfg.lua.example

@@ -1,3 +0,0 @@
--- Tell the chip to connect to thi access point
-wifi.setmode(wifi.STATION)
-wifi.sta.config("SSID","password")

wordclock.lua

@@ -1,17 +1,25 @@
 -- Revese engeeniered code of display_wc_ger.c by Vlad Tepesch
--- See https://www.mikrocontroller.net/articles/Word_Clock_Variante_1#Download
+-- See https://www.mikrocontroller.net/articles/Word_cl_Variante_1#Download
+local M
+do
 
--- Return the leds to use
--- the granuality is 5 minutes
-function display_timestat(hours, minutes, longmode)
+-- @fn wc_timestat
+-- Return the leds to use the granuality is 5 minutes
+-- @param hours the current hours (0-23)
+-- @param minutes the current minute (0-59)
+-- @param longmode (optional parameter) 0: no long mode, 1: long mode (itis will be set)
+local timestat=function (hours, minutes, longmode)
  if (longmode == nil) then
    longmode=0
  end
 
  -- generate an empty return type
- local ret = { itis=0, fiveMin=0, tenMin=0, after=0, before=0, threeHour=0, quater=0, half=0, s=0, 
-               one=0, two=0, three=0, four=0, five=0, six=0, seven=0, eight=0, nine=0, ten=0, eleven=0, twelve=0,
-               clock=0, sr_nc=0, min1=0, min2=0, min3=0, min4=0 }
+ -- Values: it, is, 5 minutes, 10 minutes, afer, before, three hour, quarter, dreiviertel, half, s
+ --  hours: one, one Long, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve
+ -- Special ones: twenty, clock, minute 1 flag, minute 2 flag, minute 3 flag, minute 4 flag
+ local ret = { it=0, is=0, m5=0, m10=0, ha=0, hb=0, h3=0, hq=0, h3q=0, half=0, s=0, 
+               h1=0, h1l=0, h2=0, h3=0, h4=0, h5=0, h6=0, h7=0, h8=0, h9=0, h10=0, h11=0, h12=0,
+               m20=0, cl=0, m1=0, m2=0, m3=0, m4=0 }
 
  -- return black screen if there is no real time given
  if (hours == nil or minutes == nil) then
@@ -20,71 +28,75 @@ function display_timestat(hours, minutes, longmode)
 
  -- transcode minutes
  local minutesLeds = minutes%5
- minutes=math.floor(minutes/5)
+ local minutes=math.floor(minutes/5)
 
  -- "It is" only display each half hour and each hour
  -- or if longmode is set
  if ((longmode==1) 
     or (minutes==0)
     or (minutes==6)) then
-        ret.itis=1        
+        ret.it=1
+        ret.is=1        
  end
 
  -- Handle minutes
  if (minutes > 0) then
    if (minutes==1) then
-    ret.fiveMin=1
-    ret.after=1
+    ret.m5=1
+    ret.ha=1
    elseif (minutes==2) then
-    ret.tenMin=1
-    ret.after=1
+    ret.m10=1
+    ret.ha=1
    elseif (minutes==3) then
-    ret.quater=1
-    ret.after=1
+    ret.hq=1
+    ret.ha=1
    elseif (minutes==4) then
-    ret.tenMin=1
-    ret.half=1
-    ret.before=1
+    ret.m20=1
+    ret.ha=1
    elseif (minutes==5) then
-    ret.fiveMin=1
+    ret.m5=1
     ret.half=1
-    ret.before=1
+    ret.hb=1
    elseif (minutes==6) then 
     ret.half=1
    elseif (minutes==7) then 
-    ret.fiveMin=1
+    ret.m5=1
     ret.half=1
-    ret.after=1
+    ret.ha=1
    elseif (minutes==8) then 
-    ret.tenMin=1
-    ret.half=1
-    ret.after=1
+    ret.m20=1
+    ret.hb=1
    elseif (minutes==9) then
-    ret.quater=1
-    ret.before=1
+    -- Hande if three quater or quater before is displayed
+    if ((threequater ~= nil) and (threequater==true or threequater=="on")) then
+        ret.h3q=1
+    else
+        ret.hq = 1
+        ret.hb = 1
+    end
    elseif (minutes==10) then 
-    ret.tenMin=1
-    ret.before=1
+    ret.m10=1
+    ret.hb=1
    elseif (minutes==11) then 
-    ret.fiveMin=1
-    ret.before=1
+    ret.m5=1
+    ret.hb=1
    end
 
-   if (minutes >= 4) then
+   if (minutes > 4) then
     hours=hours+1
    end
  else
-   ret.clock=1
+   ret.cl=1
  end
- -- Display the minutes as as extra gimmic on min1 to min 4 to display the cut number  
+ -- Display the minutes as as extra gimmic on m1 to min 4 to display the cut number  
  if (minutesLeds==1) then
-  ret.min1=1
+  ret.m1=1
  elseif (minutesLeds==2) then
-  ret.min2=1
+  ret.m2=1
  elseif (minutesLeds==3) then
-  ret.min3=1
+  ret.m3=1
  elseif (minutesLeds==4) then
-  ret.min4=1
+  ret.m4=1
  end
 
  -- handle hours
@@ -97,30 +109,87 @@ function display_timestat(hours, minutes, longmode)
  end
  
  if (hours == 1) then
-  ret.one=1
+  if ((ret.it == 1) and (ret.half == 0) ) then
+    ret.h1=1
+  else
+    ret.h1l=1
+  end
  elseif (hours == 2) then
-  ret.two=1
+  ret.h2=1
  elseif (hours == 3) then
-  ret.three=1
+  ret.h3=1
  elseif (hours == 4) then
-  ret.four=1
+  ret.h4=1
  elseif (hours == 5) then
-  ret.five=1
+  ret.h5=1
  elseif (hours == 6) then
-  ret.six=1
+  ret.h6=1
  elseif (hours == 7) then
-  ret.seven=1 
+  ret.h7=1 
  elseif (hours == 8) then
-  ret.eight=1 
+  ret.h8=1 
  elseif (hours == 9) then
-  ret.nine=1 
+  ret.h9=1 
  elseif (hours == 10) then
-  ret.ten=1  
+  ret.h10=1  
  elseif (hours == 11) then
-  ret.eleven=1 
+  ret.h11=1 
  elseif (hours == 12) then
-  ret.twelve=1 
+  ret.h12=1 
  end
- 
+ collectgarbage()
  return ret
 end
+
+
+-- Logic to display number from Mqtt as text
+function showText(dw, rgbBuffer, invertRows, dispNumber)
+if (dispNumber ~= nil) then
+   -- Values: it, is, 5 minutes, 10 minutes, afer, before, three hour, quarter, dreiviertel, half, s
+   --  hours: one, one Long, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve
+   -- Special ones: twenty, clock, minute 1 flag, minute 2 flag, minute 3 flag, minute 4 flag
+   local ret = { it=0, is=0, m5=0, m10=0, ha=0, hb=0, h3=0, hq=0, h3q=0, half=0, s=0, 
+               h1=0, h1l=0, h2=0, h3=0, h4=0, h5=0, h6=0, h7=0, h8=0, h9=0, h10=0, h11=0, h12=0,
+               m20=0, cl=0, m1=0, m2=0, m3=0, m4=0 }
+
+   print("Mqtt Display of temperature: " .. tostring(dispNumber) )
+   if (dispNumber == 1) or (dispNumber == -1) then
+     ret.h1=1
+   elseif (dispNumber == 2) or (dispNumber == -2) then
+     ret.h2=1
+   elseif (dispNumber == 3) or (dispNumber == -3) then
+     ret.h3=1
+   elseif (dispNumber == 4) or (dispNumber == -4) then
+     ret.h4=1
+   elseif (dispNumber == 5) or (dispNumber == -5) then
+     ret.h5=1
+   elseif (dispNumber == 6) or (dispNumber == -6) then
+     ret.h6=1
+   elseif (dispNumber == 7) or (dispNumber == -7) then
+     ret.h7=1
+   elseif (dispNumber == 8) or (dispNumber == -8) then
+     ret.h8=1
+   elseif (dispNumber == 9) or (dispNumber == -9) then
+     ret.h9=1
+   elseif (dispNumber == 10) or (dispNumber == -10) then
+     ret.h10=1
+   elseif (dispNumber == 11) or (dispNumber == -11) then
+     ret.h11=1
+   elseif (dispNumber == 12) or (dispNumber == -12) then
+     ret.h12=1
+   else
+       -- over or under temperature
+   end
+   return ret
+else
+   return nil
+end
+
+end
+-- Pack everything into a module
+M = {
+    timestat = timestat,
+    showText = showText
+}
+end
+return M