Add Cask::Cask#source to return cask's source code

Library/Homebrew/cask/cask.rb

@@ -20,7 +20,7 @@ module Cask
     extend Searchable
     include Metadata
 
-    attr_reader :token, :sourcefile_path, :config, :default_config
+    attr_reader :token, :sourcefile_path, :source, :config, :default_config
 
     def self.each(&block)
       return to_enum unless block
@@ -38,9 +38,10 @@ module Cask
       @tap
     end
 
-    def initialize(token, sourcefile_path: nil, tap: nil, config: nil, &block)
+    def initialize(token, sourcefile_path: nil, source: nil, tap: nil, config: nil, &block)
       @token = token
       @sourcefile_path = sourcefile_path
+      @source = source
       @tap = tap
       @block = block
 

Library/Homebrew/cask/cask_loader.rb

@@ -40,7 +40,7 @@ module Cask
       private
 
       def cask(header_token, **options, &block)
-        Cask.new(header_token, **options, config: @config, &block)
+        Cask.new(header_token, source: content, **options, config: @config, &block)
       end
     end
 

Library/Homebrew/cask/installer.rb

@@ -399,10 +399,10 @@ module Cask
     def save_caskfile
       old_savedir = @cask.metadata_timestamped_path
 
-      return unless @cask.sourcefile_path
+      return if @cask.source.blank?
 
       savedir = @cask.metadata_subdir("Casks", timestamp: :now, create: true)
-      FileUtils.copy @cask.sourcefile_path, savedir
+      (savedir/"#{@cask.token}.rb").write @cask.source
       old_savedir&.rmtree
     end