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#!/bin/bash
#
# Get playlist files using git-annex.
#

# Parameters
BASENAME="`basename $0`"
PLAYLIST="$1"
DEST="$2"
MEDIA="/var/cache/media/noise"
PLAYLISTS="$MEDIA/playlists"
APP="git annex"

if [ -z "$PLAYLIST" ]; then
  echo "Usage: $BASENAME <playlist> [dest]"

  if [ -d "$PLAYLISTS" ]; then
    echo ""
    echo "Available playlists: "
    ls $PLAYLISTS
  fi

  exit 1
elif [ ! -f "$PLAYLISTS/$PLAYLIST.m3u" ]; then
  echo "No such playlist $PLAYLISTS/$PLAYLIST.m3u"
  exit 1
fi

if [ "$BASENAME" == "playlist-drop" ]; then
  command="drop"
elif [ "$BASENAME" == "playlist-copy" ]; then
  if [ -z "$DEST" ]; then
    echo "No destination specified"
    exit 1
  elif [ -d "$DEST" ]; then
    APP="cp -Lv"
    command=""

    # Force absolute path
    DEST="`cd $DEST && pwd`"
  else
    DEST="--to $DEST"
    command="copy"
  fi
else
  command="get"
fi

echo "Getting files from $PLAYLISTS/$PLAYLIST.m3u..."

cat $PLAYLISTS/$PLAYLIST.m3u | while read file; do
  dir="$(dirname "$file")"
  base="$(basename "$file")"
  mkdir -p "$MEDIA/$dir"

  # Preserve folder structure
  if [ -z "$command" ] && [ "$APP" == "cp -Lv" ]; then
    prefix="/$dir"
    mkdir -p "$DEST$prefix"
  else
    prefix=""
  fi

  ( cd "$MEDIA/$dir" && $APP $command "$base" "$DEST$prefix" )
done