Ruby Batch Rename Files

rename.rb

#!/usr/bin/env ruby
# frozen_string_literal: true

# Rename batch-downloaded music files (obviously acquired in a lawful manner as a righteous
# citizen who believes strongly in the Free Market, the Invisible Hand, and the Capitalism
# Gods).
#
# This class assumes certain points:
#
# 1. All the files pertain to the same artist or collection — _i.e._ OST;
# 2. All the files may contain an ID suffix in the format `[alphanumeric]`; and
# 3. All the files may contain invalid characters, such as `“` or `’`.
class BatchRenameFiles
  # Filenames' extension.
  FILE_EXT = 'mp3'
  # Artist name to prefix to the song name — assumption 1.
  PREFIX = 'Artist Name'
  # Invalid characters (either String or Regexp) to replace by specific ones — assumption 3.
  INVALID_CHARS = [
    [/\s{2,}/, ' '],
    [/[“”]/, "\""],
    [/[‘’]/, "\'"],
    [/`/, '-'],
    [/[–—]/, '-']
  ].freeze
  
  # Instantiates class.
  def initialize
    @files = process_files
  end
  
  private
  
  # Gets all files to rename.
  def process_files
    list = Dir["*.#{FILE_EXT}"]
    raise Exception.new('No files retrieved!') unless list.
  end
end