Add Haml::Options.buffer_defaults

lib/haml/options.rb

@@ -28,6 +28,13 @@ module Haml
       @buffer_option_keys
     end
 
+    # @return Hash
+    def self.buffer_defaults
+      @buffer_defaults ||= buffer_option_keys.inject({}) do |hash, key|
+        hash.merge(key => defaults[key])
+      end
+    end
+
     def self.wrap(options)
       if options.is_a?(Options)
         options

test/options_test.rb

@@ -0,0 +1,21 @@
+require 'test_helper'
+
+module Haml
+  class OptionsTest < Haml::TestCase
+    def test_buffer_defaults_have_only_buffer_option_keys
+      assert_equal(
+        Haml::Options.buffer_option_keys.sort,
+        Haml::Options.buffer_defaults.keys.sort,
+      )
+    end
+
+    def test_buffer_defaults_values_are_default_options
+      Haml::Options.buffer_option_keys.each do |key|
+        assert_equal(
+          Haml::Options.defaults[key],
+          Haml::Options.buffer_defaults[key],
+        )
+      end
+    end
+  end
+end