#!/bin/sh

# mpc_update: Update an mpd playlist to include new songs in the music
# directory.

yell() { echo "$0: $*" >&2; }
die()  { yell "$*"; exit 111; }
try()  { "$@" || die "cannot $*"; }

[ "$#" -ne 2 ] && echo "usage: mpc_update <playlist> <music directory>" >&2

PLAYLIST="$1"
MUSIC_DIR="$2"

[ -d "$MUSIC_DIR" ] && cd "$MUSIC_DIR" ||
  die "music directory '$MUSIC_DIR' does not exist!"

# Clear the current playlist to prevent song duplication in mpd.
[ -e "$HOME/.local/share/mpd/playlists/${PLAYLIST}.m3u" ] &&
  try mpc clear >/dev/null &&
  try mpc rm "$PLAYLIST"

# Add every song in the music directory.
try mpc add -- *

try mpc save "$PLAYLIST"