#!/usr/bin/env ruby

require 'pty'

mask = []
File.readlines( File.join(ENV['HOME'], ".ttymask") ).each do |line|
	mask << line.chomp unless line.empty?
end
mask_regexp = /(#{Regexp.union(*mask)})/

trap(15) do
	`stty echo cooked`
	exit(1)
end

begin
	`stty -echo raw`
	rio, wio, pid = PTY.spawn(ENV['SHELL'] || "/bin/sh")

	Thread.new do
		open('typescript', 'w') do |file|
			while buf = rio.sysread(1024)
				$stdout.syswrite buf.gsub(mask_regexp) {|s| '*'*s.length}
				file.syswrite buf
			end
		end
	end

	while buf = $stdin.sysread(1024)
		wio.syswrite buf
	end
rescue PTY::ChildExited
	# ignore
ensure
	`stty echo cooked`
end