#!/bin/sh

## creates playlists on sansa
##  takes one optinal argument : sansa mount dir
##   ./sansa.sh  "/mnt/Sansa 360"


### created by : Sujee Maniyam 
###   www : http://sujee.net
###   contact : http://sujee.net/contact.php


# configure this to point to your music collection
# every thing underneath will be copied under sansa music folder
MY_MUSIC_DIR=$HOME/sansa
SANSA=/media/sansa
#SANSA="/media/Sansa e260"

if [ -n "$1" ]; then
    SANSA="$1"
fi


## --- end config

# sanity check;  look for MUSIC, PLAYLIST folders
if [ ! -d "$SANSA/music"  -o  ! -d "$SANSA/PLAYLISTS" ] ; then
    echo "**** can't find '$SANSA/music'  or '$SANSA/PLAYLISTS'"
    echo "'$SANSA' doesn't seem to be a sansa mount, please provide a correct one"
    exit 1
fi


#---------- functions ------------
#comment out MYDEBUG, or make it empty to stop debugging
#MYDEBUG="yes"  #debug true
#MYDEBUG=""  #no debug
function debug_echo ()
{
    if [ -n "$MYDEBUG" ] ; then
        echo "$@"
    fi
}

# creates s playlist based on a dir
#   $1 - dir
# file format:
#   If you have following directory structure
#           SANSA / Music / artist / song1.mp3
#           SANSA / Music / artist / song2.mp3
#
#   THe playlist is : artist.PLA, it will be in SANSA/PLAYLISTS/ directory
#   Format is : 
#       PLP PLAYLIST
#       VERSION 1.20
#
#       HARP, MUSIC\artist\song1.mp3
#
#   File format
#       - DOS style line endings
#       - DOS style backslashes
#       - encoded in UTF16-LE

function create_playlist_for_dir ()
{
    dir=$1
    a=${dir##*music\/}
    b=`echo "$a" |  tr '\/' '_'`
    #debug_echo "****B : $b"
    name=`basename "$dir"`
    #playlist_file="$SANSA/PLAYLISTS/$name.PLA"
    playlist_file="$SANSA/PLAYLISTS/$b.PLA"
    #debug_echo "PLAYLIST=$name,    file=$playlist_file"

    echo "PLP PLAYLIST" > "$playlist_file"
    echo "VERSION 1.20" >> "$playlist_file"
    echo "" >> "$playlist_file"
    for f in `find  "$dir"  -type f  \( -name "*.[mM][pP]3" -o -name "*.[wW][mM][aA]" \)`
    do
         #debug_echo "     $f"
         ext=${f##*music\/}
         ext2="MUSIC/$ext"
         # convert unix style forward slashes(/) to dos style backward slashes(\)
         ext3=`echo $ext2 | sed -e 's/\//\\\\/g'`
         #debug_echo "     $ext3"

         echo "HARP, $ext3" >> "$playlist_file"
         #echo >> "$playlist_file"
    done
    # sansa likes dos style line endings
    unix2dos "$playlist_file"

    # sansa uses files in UTF16-LE encoding
    iconv -f ASCII -t UTF16LE -o "$playlist_file.TMP"   "$playlist_file"
    mv "$playlist_file.TMP"   "$playlist_file"


    # following is for debug only
    debug_echo ""
    debug_echo "----------------------------"
    debug_echo "PLAYLIST=$name,    file=$playlist_file"
    content=`cat "$playlist_file"` 
    debug_echo "........."
    debug_echo "$content"
    debug_echo "........."



}
#---------- end functions ------------


## ------------ MAIN ----------------

# first copy the files
# timestamps to be accurate within a second.  This is needed as Unix file
# system has more accurate timestamps the VFAT file sytem of sansa
rsync -vtrL  --modify-window=1 --delete "$MY_MUSIC_DIR/" "$SANSA/music"
#rsync -vtr  --size-only --modify-window=1 --delete ~/podcasts/ /media/disk2/music/podcasts/            

# delete existing playlists
# using a subshell, so the CD won't affect following statements
#echo "HERE `pwd`"
(cd "$SANSA"/PLAYLISTS/; rm -f *.PLA)
#echo "HERE `pwd`"


# set IFS to NEWLINE (from SPACE), as file names might have spaces in them
OIFS="$IFS"
IFS=$'\n'
# create a playlist for each directory found under music
for d in `find  "$SANSA"/music/*  -type d`
do
    if [ -d "$d" ] ; then
       create_playlist_for_dir "$d"
    fi
done


IFS="$OIFS"