A lightweight IRC bot made in Lua using LuaSockets. Can be ran even on Android devices. utility commands are still under development, but the bot answers PING messages, answers to "Hi!" 's, and parses PRIVMSG's.

luaBot.lua

require "socket" --luaBot
s = socket.tcp()
passLine = io.read()

--[initial configuration]
	network = "chat.eu.freenode.net"
	nick = "jenn4|luabot"
	user = nick mode = "8"
	realname = "luaBot"
	channels = "#jenn4" -- You can stack channels like #chan1,chan2 with no spaces!
	prefix = "!!"

	msg = {}
--[/initial configuration]

function sendInitialConfig()
	print("<< Sending configuration >>")
	s:send("PASS " .. passLine .. "\r\n")
	s:send("NICK " .. nick .. "\r\n") -- send nickname
	s:send("USER " .. user .. " " .. mode .. " * " .. " :" .. realname .. "\r\n") -- send USER command
	s:send("JOIN " .. channels .. "\r\n") -- join the channels
end

function handleRawIRC()
n	if output:match " PRIVMSG " then

	--Parse channel:
	if output:match "#" then
		i = string.find(output, "#")
		j = string.find(output, " ", i)
		msg.channel = string.sub(output, 1, j)
		msg.channel = string.sub(msg.channel, i)
		print(msg.channel)
		end

		--Parse sender:
		i = string.find(output, ":")
		j = string.find(output, "!", i)
		msg.sender = string.sub(output, 1, j-1)
		msg.sender = string.sub(msg.sender, i+1)
		-- print(msg.sender)

		--Parse host:
		i = string.find(output, "~")
		j = string.find(output, " ", i)
		msg.host = string.sub(output, 1, j-1)
		msg.host = string.sub(msg.host, i+1)
		-- print(msg.host)

		--Parse message:
		i = string.find(output, ":", 2)
		msg.message = string.sub(output, i+1)
		print(msg.message)
	end

		if output:match "PING :" then
			s:send("PONG :" .. output:match"^PING :(.*)") -- Thank you, boxmein!
		end

		-- Lets just parse the msg.message here, in case of commands and their variables. And then re-write all the plugins made this far. Yay! Reformating...

		if msg.message ~= nil then
			if msg.message:sub(0, 2) == prefix then -- CHANGE THE '2' TO '0' IF STARTING TO USE ONE CHARACTER PREFIX!
				msg.type = "command"
			end

			if msg.type == "command" then
				j = string.find(msg.message, " ", 1)
				msg.command = string.sub(msg.message, 3, j)
				print(msg.command)

				if string.find(msg.message, "#", j+2)
					--do the stuff!
				end
			end
		end

end

--[commands]
function greet()
	if output:match "Hi!" then
		s:send("PRIVMSG " .. msg.channel .. ":Hi, " .. msg.sender .. "\r\n")
	end
end

function echo()
	if msg.message ~= nil then
			if msg.message:sub(1, 6) == "!!echo" then
				if msg.message:sub(8) == "#" then
--					i, j = string.find(msg.message, "echo")
--					msg.arg1 = string.sub(msg.message, j)
					i = string.find(msg.message, "#")
					print(i)
					j = string.find(msg.message, " ", i)
					print(j)
					msg.arg2 = string.sub(msg.message, 1, j)
					msg.arg2 = string.sub(msg.arg2, i)
					print(msg.arg2)
					msg.arg1 = string.sub(msg.message, j+1)
					s:send("PRIVMSG " .. msg.arg2 .. " :" .. msg.arg1 .. "\r\n")
					print("PRIVMSG " .. msg.arg2 .. " :" .. msg.arg1)
				else
					i, j = string.find(msg.message, "echo")
					msg.arg1 = string.sub(msg.message, j+2)
					s:send("PRIVMSG " .. msg.channel .. " :" .. msg.arg1 .. "\r\n")
				end
			end
		end
end

function raw()
	if msg.message ~= nil then
		if msg.message:sub(1, 5) == "!!raw" then
			s:send(msg.message:sub(7) .. "\r\n")
			print(msg.message:sub(7))
		end
	end
end

function join()
	if msg.message ~= nil then
		if msg.message:sub(1, 6) == "!!join" then
			i = string.find(msg.message, "#")
			msg.arg1 = string.sub(msg.message, i)
			s:send("JOIN " .. msg.arg1 .. "\r\n")
		end
	end
end
--[/commands]

function listenForCommands()

greet()
--echo()
--raw()
--join()

end

function init()
	s:connect(network, 6667)
	sendInitialConfig()
	while true do
		output = s:receive("*l*")
		print(output)
		handleRawIRC()
		listenForCommands()
	end
end

init()