darkrc/bin/hi

#!/usr/bin/env lua
-- vim: set noexpandtab tabstop=3 :miv --

local ansicolors = require 'ansicolors'
local lpeg = require 'lpeg'

local colors = { 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan' }

local function uncase(str)
	local p = lpeg.P(0)
	for char in str:gmatch('.') do
		p = p * (lpeg.P(char:upper()) + lpeg.P(char:lower()))
	end
	return p
end

local pattern = lpeg.P(false)
for i=1, select('#', ...) do
	pattern = pattern + uncase(select(i, ...)) / function(capture) return ansicolors('%{'..colors[(i-1)%#colors+1]..' underline}'..capture) end
end

pattern = lpeg.Cs((pattern + lpeg.P(1)) ^ 1)

for line in io.stdin:lines() do
	print(pattern:match(line) or '')
end