#!/bin/bash
#
# Check for files not on any playlist.
#
# This script lists music files that aren't on any playlist (useful for
# removing dangling files etc).
#

# Parameters
BASENAME="`basename $0`"
ITEM="$1"
MEDIA="/var/cache/media/noise"
PLAYLISTS="$MEDIA/playlists"

# Check orphaned files
function playlist_orphan {
  local file="`echo "$*" | sed -e 's|^./||' -e "s|^$MEDIA/||"`"

  # Ignore playlist files
  if [ "`basename "$file"`" != "`basename "$file" .m3u`" ]; then
    return
  fi

  # Check if a file is not in any playlist
  if ! grep -q "$file" $PLAYLISTS/*m3u; then
    #echo "Orphan: $file"
    echo "$file"
  #else
  #  echo "Not orphan: $file"
  fi
}

# Process a path
function playlist_orphans {
  local cwd="`pwd`"

  cd $MEDIA

  if [ ! -z "$FILE" ]; then
    playlist_orphan $FILE
  else
    # We're not keeping a list of specific file extensions to search, because
    # it would need to be maintained, which we can't do right now.
    find $FOLDER -not -type d | while read entry; do
      playlist_orphan $entry
    done
  fi

  cd $cwd
}

# Basic syntax check
if [ "$ITEM" == "--help" ]; then
  echo "Usage: $BASENAME [file|folder]"

  exit 1
fi

# Determine items
if [ ! -z "$ITEM" ]; then
  if [ -d "$MEDIA/$ITEM" ]; then
    FOLDER="$MEDIA/$ITEM"
  elif [ -e "$MEDIA/$ITEM" ] || [ -L "$MEDIA/$ITEM" ]; then
    FILE="$MEDIA/$ITEM"
  else
    echo "$BASENAME: error: item not found: $MEDIA/$ITEM"
    exit 1
  fi
else
  FOLDER="."
fi

# Dispatch
playlist_orphans