Parse TOML or YAML in Jekyll::Configuration.

jekyll.gemspec

@@ -32,6 +32,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency('safe_yaml', "~> 0.9.7")
   s.add_runtime_dependency('colorator', "~> 0.1")
   s.add_runtime_dependency('redcarpet', "~> 2.3.0")
+  s.add_runtime_dependency('toml', '~> 0.0.4')
 
   s.add_development_dependency('rake', "~> 10.1")
   s.add_development_dependency('rdoc', "~> 3.11")

lib/jekyll/configuration.rb

@@ -99,6 +99,17 @@ module Jekyll
       override['source'] || self['source'] || DEFAULTS['source']
     end
 
+    def safe_load_file(filename)
+      case File.extname(filename)
+      when '.toml'
+        TOML.load_file(filename)
+      when /\.y(a)?ml/
+        YAML.safe_load_file(filename)
+      else
+        raise ArgumentError, "No parser for '#{filename}' is available."kk
+      end
+    end
+
     # Public: Generate list of configuration files from the override
     #
     # override - the command-line options hash
@@ -121,8 +132,8 @@ module Jekyll
     #
     # Returns this configuration, overridden by the values in the file
     def read_config_file(file)
-      next_config = YAML.safe_load_file(file)
-      raise ArgumentError.new("Configuration file: (INVALID) #{file}".yellow) if !next_config.is_a?(Hash)
+      next_config = safe_load_file(file)
+      raise ArgumentError.new("Configuration file: (INVALID) #{file}".yellow) unless next_config.is_a?(Hash)
       Jekyll.logger.info "Configuration file:", file
       next_config
     rescue SystemCallError