Add a README file

bin/7digital.rb

@@ -0,0 +1,88 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require 'pathname'
+require 'open3'
+
+# Renames music files in a directory according to the file's tags.
+# Expects two arguments:
+# - Path to the zip file with music files.
+# - Music directory to extract songs into.
+
+class Song
+  attr_reader :title, :track, :extension
+
+  def initialize(extension)
+    @extension = extension
+  end
+
+  def title=(title)
+    @title = title.strip
+  end
+
+  def track=(track)
+    @track = track.strip.split('/').first.rjust(2, '0')
+  end
+
+  def to_s
+    @track + ' - ' + @title + @extension
+  end
+end
+
+def find_unnamed_directory(parent_path)
+  parent_path.children.filter { |child| child.basename.to_s.start_with? '_' }.first
+end
+
+def extract_and_rename_archive(album_archive, music_directory)
+  artist_name, album_name = album_archive.basename('.zip').to_s.split(' - ')
+
+  system 'unzip', '-d', music_directory.to_path, album_archive.to_path, exception: true
+
+  artist_path = music_directory + artist_name
+  album_path = artist_path + album_name
+  source_artist_path = find_unnamed_directory music_directory
+
+  if artist_path.exist?
+    find_unnamed_directory(source_artist_path).rename album_path
+    source_artist_path.unlink
+  else
+    source_artist_path.rename artist_path
+    find_unnamed_directory(artist_path).rename album_path
+  end
+  album_path
+end
+
+def probe_song(song_path)
+  song = Song.new song_path.extname
+
+  Open3.popen3 'ffprobe', song_path.to_s do |_stdin, _stdout, stderr, _wait_pid|
+    while (line = stderr.gets)
+      key, value = line.split ':'
+      next if value.nil?
+
+      case key.strip.downcase
+      when 'title'
+        song.title = value if song.title.nil?
+      when 'track'
+        song.track = value if song.track.nil?
+      end
+    end
+  end
+  song
+end
+
+album_archive = Pathname.new ARGV[0]
+music_directory = Pathname.new ARGV[1]
+metadata = {}
+
+album_path = extract_and_rename_archive album_archive, music_directory
+
+Dir.each_child album_path do |filename|
+  song_path = album_path + filename
+
+  metadata[song_path] = probe_song(song_path).to_s
+end
+
+metadata.each_pair do |from, to|
+  File.rename(from, album_path + to)
+end