sync-albums

#!/bin/sh

usage()
{
    cat >&2 <<__EOF__
Usage: $(basename $0) [ -m mount-dir ] [ album-dir ]

Options:
  -m mount-dir    -- iPod mount point. Defaults to ${HOME}/mnt/ipod.
  album-dir       -- Name of the album directory. Defaults to
                     ${HOME}/media/music/classical.
__EOF__
    exit ${1-1}
}

log()
{
    echo "$(basename $0): $1" >&2
}

while [ $# -gt 0 ]; do
    case $1 in
    -h|--help)
        usage 0
        ;;
    -m)
        shift; mntdir=$1
        ;;
    *)
        albumsdir=$1
        shift
        [ $# -gt 0 ] && usage
        ;;
    esac
    shift
done

: ${mntdir=${HOME}/mnt/ipod}
: ${albumsdir=${HOME}/media/music/classical}

if [ ! -d "$mntdir" ]; then
    log "$mntdir is not a directory"
    exit 1
elif ! expr "$mntdir" : / >/dev/null 2>&1; then
    mntdir=$(realpath "$mntdir")
fi

cd "$albumsdir"

IFS='
'
for audfile in $(find . -name '*.mp3' -o -name '*.ogg'); do
    dir=$(dirname "$audfile")
    file=$(basename "$audfile")
    mkdir -p "$mntdir/$dir"

    if [ ! -f "$mntdir/$audfile" ] || ! cmp -s "$mntdir/$audfile" "$audfile"; then
        log "copying $audfile to iPod"
        cp "$audfile" "$mntdir/$dir"
    fi
done