#!/usr/bin/env ruby

require 'taglib'
require 'fileutils'

if ARGV.empty?
    puts "ERROR: no argument given..."
    puts "usage: tag-tracks TARGET_DIR"
    return 69
end

target_dir = ARGV.first

Dir.chdir("#{target_dir}")

puts "Tagging Tracks in #{Dir.pwd} ..."

mp3_files = Dir.glob("*").sort_by { |x| File.basename(x).downcase }

track_num = 1

mp3_files.each do |song|
  song_name = File.basename(song, File.extname(song))
  TagLib::MPEG::File.open(song) do |file|
    tag = file.id3v2_tag
    tag.track = track_num
    tag.title = "#{song_name}"
    file.save
    track_num += 1
  end
end

puts "Done!"