receive.lua

-- Program to receive messages from computers/
-- turtles using flex.lua "send" function
-- <[email protected]>

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-- |¯\|¯¯] /¯]|¯¯][¯¯]\\  //|¯¯]|¯\ --
-- | /| ] | [ | ]  ][  \\// | ] | / --
-- | \|__] \_]|__][__]  \/  |__]| \ --
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local log_file = "log.txt"
local options_file = "flex_options.cfg"
os.loadAPI("flex.lua")
local modem_channel = 6464


if fs.exists(options_file) then
 local file = fs.open("flex_options.cfg", "r")
 local line = file.readLine()
 while line ~= nil do
  if string.find(line, "modem_channel=") == 1 then
   modem_channel = tonumber( string.sub(
         line, 15, string.len(line) ) )
   break
  end --if
  line = file.readLine()
 end --while
 file.close()
end --if


local modem
local p = flex.getPeripheral("modem")
if #p > 0 then
 modem = peripheral.wrap(p[1])
 modem.open(modem_channel)
else
 flex.printColors("Please attach a wireless"
   .." or ender modem\n", colors.red)
 sleep(2)
 return
end --if/else

local monitor
p = flex.getPeripheral("monitor")
if #p > 0 then
 monitor = peripheral.wrap(p[1])
 term.redirect(monitor)
 monitor.clear()
 monitor.setCursorPos(1,1)
 monitor.setTextScale(0.5)
end --if
local lcd_x,lcd_y = monitor.getSize()


local file, line
local filelist = {}
if fs.exists(log_file) then
 file = fs.open(log_file, "r")
 line = file.readLine()

 while line ~= nil do

  if line ~= "" or ( line == "" and
     filelist[#filelist] ~= "" ) then
   filelist[#filelist+1] = line
  end --if

  line = file.readLine()
 end --while
 file.close()
 file = fs.open(log_file, "a")

else
 -- Log file does not exist: make one!
 file = fs.open(log_file, "w")

end --if/else


local x, y
y = math.max(1,#filelist-lcd_y)
for x=y, #filelist do
 flex.printColors(filelist[x])
end --for

if filelist[#filelist] ~= "" then
 file.writeLine("")
end --if
file.close()


term.setTextColor(colors.white)
print("Waiting for message on channel "
      ..tostring(modem_channel).."...")

while true do
 local event, modemSide, senderChannel,
    replyChannel, message, senderDistance =
    os.pullEvent("modem_message")

 file = fs.open(log_file, "a")
 file.writeLine(message)
 file.close()

 flex.printColors(message)

 sleep(0.01)
end --while