#!/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!

# Modified by Dugan Chen (dugan_c@fastmail.fm)
# Submitted on Dec 12th, 2005
#
# I've merged in the following:
#   *  Jyotirmoy_Bhattacharya's fix to make sure only one instance of
#      bashpodder runs at a time
#   *  Lorenzo Taylor's URL and filename handling code
#   *  Scott Maxwell's fix for the grep errors
#   *  Leon Pennington's fix for not creating empty directories
#
# I also implemented the following changes here but did not invent them:
#   *  --catchup_all parameter to log urls but not download them
#   * storing filenames in the logfile rather than the whole url
#
# The result is bashpodder as I personally like it!
#
# Note that it's mean't to be executed manually, not from cron, and
# that it needs curl.

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


# If this is the first time, touch podcast.log to shut up the grep below.
if ! [ -e podcast.log ]
	then
	touch podcast.log
fi

if [ "$1" = "--catchup_all" ]
	then
	# Read the bp.conf file and simply log each URL.
	while read podcast
		do
		file=$(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 $file
			do
			realurl=`curl -s -I -L -w %{url_effective} --url "$url" | tail -n 1`
			filename=`echo "$realurl" | awk -F / '{print $NF}' | sed -e "s/%20/ /g" -e "s/%27/'/g" -e "s/%23/#/g" | awk -F ? '{print $1}'`
			if ! grep "$filename" podcast.log > /dev/null
				then
				echo $filename >> temp.log	
			fi
		done
	done < bp.conf
else
	# Read the bp.conf file and wget any url not already in the podcast.log file:
	while read podcast
		do
		file=$(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 $file
			do
			realurl=`curl -s -I -L -w %{url_effective} --url "$url" | tail -n 1`
			filename=`echo "$realurl" | awk -F / '{print $NF}' | sed -e "s/%20/ /g" -e "s/%27/'/g" -e "s/%23/#/g" | awk -F ? '{print $1}'`
			if ! grep "$filename" podcast.log > /dev/null
				then
				curl -C - $realurl -o $datadir/$filename && echo $filename >> temp.log
			fi		
		done
	done < bp.conf

fi

# Move dynamically created log file to permanent log file:
cat podcast.log >> temp.log
sort temp.log | uniq > podcast.log
rm temp.log

if [[ -z $(ls $datadir) ]]; then
   rmdir $datadir
else
# Create an m3u playlist:
   ls $datadir | grep -v m3u > $datadir/podcast.m3u
fi

#Release lock
rm -f $LOCKFILE