#!/bin/sh


base="https://twitter.com"
tweeircdir="/tmp/tweeirc"
irc_channel="#twitter"
irc_server="localhost"
irc_port="6666"
refresh_time="3600"


#
# Given a username print to standard output all tweets newer than the id stored
# in fileid.
#
tweets()
{
	username=$1

	curl -gs "${base}/${username}" | tscrape | sort -n |
	awk -F '\t' \
	    -v fileid="${tweeircdir}/${username}" '
	BEGIN {
		getline min_id < fileid
		min_id = int(min_id)
		max_id = 0
	}

	{
		timestamp = $1
		username = $2
		text = $4
		item_id = $5
		item_username = $6
		item_retweetid = $8
		item_pinned = $9
		id = item_retweetid ? item_retweetid : item_id
		id = int(id)
		max_id = id > max_id ? id : max_id
	}

	(id > min_id) {
		if (username != item_username)
			printf("RT @%s ", item_username)
		printf("%s\n", text)
	}

	END {
		if (max_id > min_id)
			print max_id > fileid
	}
	'
}


#
# Given a username, pipe to the IRC channel
#
irc()
{
	username=$1

	awk -v nc="nc ${irc_server} ${irc_port} > /dev/null" \
	    -v channel="${irc_channel}" \
	    -v username="${username}" '
	BEGIN {
		print "NICK " username | nc
		print "USER " username " * * *" | nc
		fflush(nc)
	}

	{
		print "PRIVMSG " channel " :" $0 | nc
		fflush(nc)
	}

	END {
		print "QUIT" | nc
		close(nc)
	}
	'
}


#
# Given an IRC server, port and channel fetch all Twitter user timelines,
# parse them via tscrape and share each tweet on the IRC channel with the
# proper nick.
#
mkdir -p "${tweeircdir}"
while :; do
	for u in "$@"; do
		tweets "$u" | irc "$u"
	done

	sleep "${refresh_time}"
done