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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"

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

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

  echo "Examples:"
  echo ""
  echo "$BASENAME ambient adb"
  echo "$BASENAME groove  /media/usb"
  echo "$BASENAME funk    remote-repository"

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

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

    # Force absolute path
    DEST="`cd "$DEST" && pwd`"
  elif [ "$DEST" == "adb" ]; then
    APP="adb"
    action="push"
    #DEST="/storage/emulated/0/Music"
    DEST="/sdcard/Music"
  else
    DEST="--to $DEST"
    action="copy"
  fi
else
  action="get"
fi

# Start
echo "Getting files from $PLAYLISTS/$PLAYLIST.m3u..."
cd $MEDIA

# Process
cat $PLAYLISTS/$PLAYLIST.m3u | while read file; do
  if [ -z "$action" ] && [ "$APP" == "cp -Lv" ]; then
    prefix="/$(dirname "$file")"
    mkdir -p "$DEST$prefix"
    $APP $action "$file" "$DEST$prefix"
  elif [ "$action" == "get" ]; then
    $APP $action "$file"
  elif [ "$APP" == "adb" ]; then
    prefix="/$(dirname "$file")"
    echo mkdir -p \"$DEST$prefix\" | adb shell
    $APP $action "$file" "$DEST$prefix"
  else
    $APP $action "$file" $DEST
  fi
done

# Additional procedures
if [ "$action" != "get" ]; then
  # Copy the playlist to the destination
  $APP $action "$PLAYLISTS/$PLAYLIST.m3u" "$DEST/$PLAYLIST.m3u"

  # Refresh file list at the destination
  if [ "$APP" == "adb" ]; then
    # Thanks https://stackoverflow.com/questions/17928576/refresh-android-mediastore-using-adb
    echo "Updating file list at the destination..."
    adb shell "find $DEST -exec am broadcast \
    -a android.intent.action.MEDIA_SCANNER_SCAN_FILE \
    -d file://{} \\;"
  fi
fi