Add #content_with_named_vars

Author: rastating

lib/wpxf/core/data_file.rb

@@ -13,6 +13,12 @@ def php_content
       content.strip.sub(/^<\?php/i, '').sub(/\?>$/i, '')
     end
 
+    # @return [String] the contents of the data file with variable replacements.
+    def content_with_named_vars(vars)
+      matcher = /#{vars.keys.map { |k| Regexp.escape(k) }.join('|')}/
+      content.gsub(matcher, vars)
+    end
+
     # @return the content of the file.
     attr_accessor :content
   end