make sitemap ignore list configurable, use it to hide extensionless output files

lib/middleman/core_extensions/sitemap.rb

@@ -4,6 +4,21 @@ require 'find'
 module Middleman::CoreExtensions::Sitemap
   class << self
     def registered(app)
+      app.set :ignored_sitemap_matchers, {
+        # dotfiles and folders in the root
+        :root_dotfiles => proc { |file, path| file.match(/^\./) },
+        
+        # Files starting with an dot, but not .htaccess
+        :source_dotfiles => proc { |file, path| 
+          (file.match(/\/\./) && !file.match(/\/\.htaccess/)) 
+        },
+        
+        # Files starting with an underscore, but not a double-underscore
+        :partials => proc { |file, path| (file.match(/\/_/) && !file.match(/\/__/)) },
+        
+        # Files without any output extension (layouts, partials)
+        :extentionless => proc { |file, path| !path.match(/\./) },
+      }
       app.send :include, InstanceMethods
     end
     alias :included :registered

lib/middleman/sitemap/store.rb

@@ -98,21 +98,15 @@ module Middleman::Sitemap
     end
     
     def touch_file(file)
-      return false if file == @source ||
+      return false if file == @source || File.directory?(file)
-                      file.match(/^\./) ||
-                      (file.match(/\/\./) && !file.match(/\/\.htaccess/)) ||
-                      (file.match(/\/_/) && !file.match(/\/__/)) ||
-                      File.directory?(file)
-                     
-      path = file_to_path(file)
       
+      path = file_to_path(file)
       return false unless path
       
-      return false if path.match(%r{^layout}) ||
+      return false if @app.ignored_sitemap_matchers.any? do |name, callback|
-                      path.match(%r{^layouts/})
+        callback.call(file, path)
-    
+      end
-      # @app.logger.debug :sitemap_update, Time.now, path if @app.logging?
+          
-      
       # Add generic path
       p = page(path)
       p.source_file = File.expand_path(file, @app.root)
@@ -121,6 +115,10 @@ module Middleman::Sitemap
       true
     end
     
+    def sitemap_should_ignore?(file, path)
+      @app.sitemap_ignore.every(&:call)
+    end
+    
   protected
     def extensionless_path(file)
       app.cache.fetch(:extensionless_path, file) do