#!/bin/sh
# Play given files on mpd, enabling playing of external files through symlinking and recursively resolving playlists
# depends: xargs realpath mpc
# env: MUSIC
MUSIC="${MUSIC:-$(cat ${XDG_CONFIG_HOME:-$HOME/.config}/mpd/mpd.conf | grep music_directory | cut -d'"' -f2 | sed "s|~|$HOME|")}"
PLAYLISTS="$MUSIC/Playlists"
LINKS="$MUSIC/links"
if test "$1" = "-r"
then shift
  test "$1" = "-v" && verbose=-v && shift
  for arg;
  do
    path="$(test -e "$arg" && realpath "$arg" ||
      ( test -e "$MUSIC/$arg" && realpath "$MUSIC/$arg") ||
      ( test -e "$PLAYLISTS/$arg" && realpath "$PLAYLISTS/$arg") )"
    test -n "$verbose" && echo "Scanning path '$path' $(test "$arg" != "$path" && echo "from '$arg' ")(MUSIC: '$MUSIC', PWD: '$PWD')" >&2
    test -n "$path" || continue
    if { file "$path" | grep -i ' playlist' || expr "$path" : ".*\.m3u8\?$"; } >/dev/null
    then pushd "$(dirname "$path")" >/dev/null && cat "$path" | sed '/#.*/D' | xargs --delim='\n' "$0" -r $verbose && popd >/dev/null
    else
      test -n "$verbose" && echo "Finding path '$path' $(test "$arg" != "$path" && echo "from '$arg' ")(MUSIC: '$MUSIC', PWD: '$PWD')" >&2
      find "$path" -name "*.flac" -o -name "*.mp3" | sort | while read file
        do case "$path" in
          ($MUSIC/*) echo "${file#$MUSIC/}";;
          (*) mkdir -p "$LINKS" && ln -fs "$file" "$LINKS/$(basename "$file")" && echo "${LINKS#$MUSIC/}/$(basename "$file")";;
        esac done
    fi
  done
else
  test "$1" = "-q" && quiet=-q && shift
  test -n "$(mpc playlist)" && next=-q
  { "$0" -r "$@" && mpc -q update --wait; } | #tee /tmp/mp 2>&1
    xargs --delim='\n' mpc insert
  mpc ${quiet:-$next} play
  test -z "$next" || mpc $quiet next
fi