#!/bin/sh
# Play given files on mpd, enabling playing of external files through symlinking and recursively resolving playlists
# depends: xargs mpc realpath
# env: MUSIC
PLAYLISTS="$MUSIC/Playlists"
LINKS="$MUSIC/links"
test "$1" = "-q" && quiet=-q && shift
test "$1" = "-v" && verbose=-v && shift
test "$1" = "-r" && shift || next=true
{ for arg;
do path="$(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' from '$arg'" >&2
  test -n "$path" || continue
  if file "$path" | grep -i ' playlist' || expr "$path" : ".*\.m3u8\?$" >/dev/null
  then pushd "$(dirname "$path")" >/dev/null && cat "$path" | xargs --delim='\n' "$0" $verbose -r && popd >/dev/null
  else
    find "$path" -name "*.flac" -o -name "*.mp3" | 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 && mpc -q update --wait; } | xargs --delim='\n' mpc insert

if test "$next"
then test $(mpc status | wc -l) -gt 1 && mpc $quiet next || mpc $quiet play
fi