#!/bin/bash -e

cd `dirname "$0"`

EMAIL="your.mail.goes@here.com"

NAME=`basename "$0"`
LOGFILE="$NAME.log"
DATFILE="$NAME.dat"

# Enable User Level Cron
# https://help.ubuntu.com/community/CronHowto

# In order for users to have their cron jobs executed,
# they must be added to the /etc/cron.allow file.
# sudo cat > /etc/cron.allow <<EOD
# root
# $USER
# EOD

# Cron job to broadcast every 5 minutes
CRONJOB="*/5 * * * * $PWD/$NAME"

# If cron job exist, run it, else just add it
if ( crontab -l &>/dev/stdout | grep -q $NAME ); then
	echo >>"$LOGFILE" "`date`: Running job."
	if [ ! -f $HOME/.irssi/away.log ]; then
		echo >>"$LOGFILE" "No away log detected"
		exit
	fi

	# Grep out the interesting parts of the away log
	#TEMPFILE=`tempfile --prefix away-`
	TEMPFILE=`python -c "import tempfile; print tempfile.mktemp(prefix='away-')"`
	(egrep -v '^---' $HOME/.irssi/away.log | tr -d -c '[:print:]\n') &>"$TEMPFILE"

	# If new and old files differ (or one is missing)
	if ! (diff -q "$DATFILE" "$TEMPFILE" &>/dev/null); then
		(diff --text --unified "$DATFILE" "$TEMPFILE" | \
		mail -s "IRSSI away log" "$EMAIL") >>"$LOGFILE" 2>&1
		mv -v "$TEMPFILE" "$DATFILE" >>"$LOGFILE" 2>&1
	fi
else
	echo >>"$LOGFILE" "`date`: Adding cron job '$CRONJOB'."
	echo "$CRONJOB" | crontab - &>/dev/stdout | cat >> "$LOGFILE"
	echo "Daemon started..."
fi