Use module Compat style.

Library/Homebrew/compat/tap.rb

@@ -1,38 +1,38 @@
-module CaskTapMigration
-  def initialize(user, repo)
-    super
-
-    return unless user == "caskroom"
-
-    # TODO: Remove this check after migration.
-    return unless repo == "tap-migration-test"
-
-    new_user = "Homebrew"
-    new_repo = (repo == "cask") ? repo : "cask-#{repo}"
-
-    old_name = name
-    old_path = path
-    old_remote = path.git_origin
-
-    super(new_user, new_repo)
-
-    return unless old_path.git?
-
-    new_name = name
-    new_path = path
-    new_remote = default_remote
-
-    ohai "Migrating tap #{old_name} to #{new_name}..." if $stdout.tty?
-
-    puts "Moving #{old_path} to #{new_path}..." if $stdout.tty?
-    path.dirname.mkpath
-    FileUtils.mv old_path, new_path
-
-    puts "Changing remote from #{old_remote} to #{new_remote}..." if $stdout.tty?
-    new_path.git_origin = new_remote
-  end
-end
-
 class Tap
-  prepend CaskTapMigration
+  module Compat
+    def initialize(user, repo)
+      super
+
+      return unless user == "caskroom"
+
+      # TODO: Remove this check after migration.
+      return unless repo == "tap-migration-test"
+
+      new_user = "Homebrew"
+      new_repo = (repo == "cask") ? repo : "cask-#{repo}"
+
+      old_name = name
+      old_path = path
+      old_remote = path.git_origin
+
+      super(new_user, new_repo)
+
+      return unless old_path.git?
+
+      new_name = name
+      new_path = path
+      new_remote = default_remote
+
+      ohai "Migrating tap #{old_name} to #{new_name}..." if $stdout.tty?
+
+      puts "Moving #{old_path} to #{new_path}..." if $stdout.tty?
+      path.dirname.mkpath
+      FileUtils.mv old_path, new_path
+
+      puts "Changing remote from #{old_remote} to #{new_remote}..." if $stdout.tty?
+      new_path.git_origin = new_remote
+    end
+  end
+
+  prepend Compat
 end