Useful shell script that takes a file list as stdin and returns only those files not loaded into the active iTunes library

itunes_filter_new_media.sh

#!/bin/bash

permitted_file_extensions="mov|mp4|m4v|mpg|mpeg|m2v|mp2|ite|aac|m4a|m4b|m4p|mp3|caf|aiff|aif|aifc|au|sd2|wav|snd|amr|3ga"

eval "active_library="$(defaults read com.apple.iApps iTunesRecentDatabases)
printf -v active_library '%b' "${active_library[0]//%/\\x}"
active_library="${active_library#file://localhost}"
if [[ ! -e "$active_library" ]]; then
  exit 1
fi

function url_encode_for_itunes()
{
  local encoded="$(perl -MURI::Escape -e 'print uri_escape($ARGV[0]);' "${1}")"
  encoded="${encoded//\%2F//}"
  encoded="${encoded//\%28/(}"
  encoded="${encoded//\%29/)}"
  encoded="${encoded//\%27/\'}"
  encoded="${encoded//\%2C/,}"
  REPLY="${encoded}"
}

function filter_existing_itunes_media_files()
{
  # If stdin is a directory...
  if [[ -d "$1" ]]; then
    
    # Check all files having the permitted file extensions
    find "$1" -depth 1 -type f | grep -E -i "\.($permitted_file_extensions)$" | sort | while read path
    do
      filter_existing_itunes_media_files "$path"
    done
    
    # Recurse into directories
    find "$1" -depth 1 -type d | while read path
    do
      filter_existing_itunes_media_files "$path"
    done
    
  # Else, if stdin is a file...
  elif [[ -f "$1" ]]; then
    url_encode_for_itunes "$1"
    grep -q "${REPLY}" "$active_library" &>/dev/null || echo -e "$1"
  fi
}

while read path
do
  filter_existing_itunes_media_files "$path"
done

LICENSE

Copyright (c) 2014, Matt Lubner <matt@mattlubner.com>

The "ISC" license:

Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

The Automator workflow is available at: https://github.com/mattlubner/Import-to-iTunes