#!/bin/bash
# By Linc 10/1/2004
# Find the latest script at http://linc.homeunix.org:8080/scripts/bashpodder
# Last revision 07/01/2005 - Many Contributers!
# If you use this and have made improvements or have comments
# drop me an email at linc dot fessenden at gmail dot com
# I'd appreciate it!

#Revised on 2005-11-06 by Jyotirmoy Bhattacharyya 
# (jmoy dot matecon at gmail dot com)
#Added locking code

LOCKFILE="lock.bashpodder"

instance_lock ()
{
        TEMPFILE="temp.$$"
        echo $$ > $TEMPFILE || {
                echo "Could not create lock file"
                return 1
        }
	trap "rm -f $TEMPFILE; exit" SIGINT SIGTERM 
        ln $TEMPFILE $LOCKFILE >& /dev/null && {
                rm -f $TEMPFILE
		trap "rm -f $LOCKFILE; exit" SIGINT SIGTERM 
        	return 0
        }
        kill -0 `cat $LOCKFILE` >& /dev/null && {
                rm -f $TEMPFILE
                return 1
        }
        echo "Removing stale lock file"
        rm -f $LOCKFILE
        ln $TEMPFILE $LOCKFILE >& /dev/null && {
                rm -f $TEMPFILE
		trap "rm -f $LOCKFILE; exit" SIGINT SIGTERM 
                return 0
        }
        rm -f $TEMPFILE
	trap - SIGINT SIGTERM
        return 1
}

# Make script crontab friendly:
cd $(dirname $0)

# datadir is the directory you want podcasts saved to:
datadir=$(date +%Y-%m-%d)

# Check for and create datadir if necessary:
if test ! -d $datadir
        then
        mkdir $datadir
fi

#Check if another instance is already running
instance_lock || {
	echo "An instance of bashpodder is already running"; exit 1
}

# Delete any temp file:
rm -f temp.log

# Read the bp.conf file and wget any url not already in the podcast.log file:
while read podcast
	do
	file=$(wget -q $podcast -O - | xsltproc parse_enclosure.xsl - 2> /dev/null) || file=$(wget -q $podcast -O - | tr '\r' '\n' | tr \' \" | sed -n 's/.*url="\([^"]*\)".*/\1/p')
	for url in $file
		do
		if ! grep -q "$url" podcast.log 
			then
			wget -q -P $datadir "$url" && echo $url >> temp.log
		fi
		done
	done < bp.conf
# Move dynamically created log file to permanent log file:
cat podcast.log >> temp.log
sort temp.log | uniq > podcast.log
rm temp.log
# Create an m3u playlist:
ls $datadir | grep -v m3u > $datadir/podcast.m3u

#Release lock
rm -f $LOCKFILE