[Generator::Constant] Add a generator that just writes a constant string

lib/cocoapods.rb

@@ -57,6 +57,7 @@ module Pod
     autoload :Markdown,                'cocoapods/generator/acknowledgements/markdown'
     autoload :Plist,                   'cocoapods/generator/acknowledgements/plist'
     autoload :BridgeSupport,           'cocoapods/generator/bridge_support'
+    autoload :Constant,                'cocoapods/generator/constant'
     autoload :CopyResourcesScript,     'cocoapods/generator/copy_resources_script'
     autoload :DummySource,             'cocoapods/generator/dummy_source'
     autoload :EmbedFrameworksScript,   'cocoapods/generator/embed_frameworks_script'

lib/cocoapods/generator/constant.rb

+module Pod
+  module Generator
+    # Generates a constant file.
+    #
+    class Constant
+      def initialize(contents)
+        @generate = contents
+      end
+
+      attr_reader :generate
+
+      def save_as(path)
+        path.open('w') do |f|
+          f.write(generate)
+        end
+      end
+    end
+  end
+end