Add auto_javascript_include_tag that behaves similarly to auto_stylesheet_link_tag.

Includes new features/fixtures.

features/helpers_auto_javascript_include_tag.feature

@@ -0,0 +1,27 @@
+Feature: Built-in auto_javascript_include_tag view helper
+  In order to simplify including javascript files
+
+  Scenario: Viewing the root path
+    Given the Server is running
+    When I go to "/auto-js.html"
+    Then I should see "javascripts/auto-js.js"
+
+  Scenario: Viewing a tier-1 path
+    Given the Server is running
+    When I go to "/auto-js/auto-js.html"
+    Then I should see "javascripts/auto-js/auto-js.js"
+
+  Scenario: Viewing the index file of a tier-1 path, without filename
+    Given the Server is running
+    When I go to "/auto-js"
+    Then I should see "javascripts/auto-js/index.js"
+
+  Scenario: Viewing the index file of a tier-1 path, without filename, with a trailing slash
+    Given the Server is running
+    When I go to "/auto-js/"
+    Then I should see "javascripts/auto-js/index.js"
+
+  Scenario: Viewing a tier-2 path
+    Given the Server is running
+    When I go to "/auto-js/sub/auto-js.html"
+    Then I should see "javascripts/auto-js/sub/auto-js.js"

features/helpers_auto_stylesheet_link_tag.feature

@@ -8,10 +8,20 @@ Feature: Built-in auto_stylesheet_link_tag view helper
 
   Scenario: Viewing a tier-1 path
     Given the Server is running
-    When I go to "/sub1/auto-css.html"
-    Then I should see "stylesheets/sub1/auto-css.css"
+    When I go to "/auto-css/auto-css.html"
+    Then I should see "stylesheets/auto-css/auto-css.css"
+
+  Scenario: Viewing the index file of a tier-1 path, without filename
+    Given the Server is running
+    When I go to "/auto-css"
+    Then I should see "stylesheets/auto-css/index.css"
+
+  Scenario: Viewing the index file of a tier-1 path, without filename, with a trailing slash
+    Given the Server is running
+    When I go to "/auto-css/"
+    Then I should see "stylesheets/auto-css/index.css"
 
   Scenario: Viewing a tier-2 path
     Given the Server is running
-    When I go to "/sub1/sub2/auto-css.html"
-    Then I should see "stylesheets/sub1/sub2/auto-css.css"
+    When I go to "/auto-css/sub/auto-css.html"
+    Then I should see "stylesheets/auto-css/sub/auto-css.css"

fixtures/test-app/config.rb

@@ -17,14 +17,27 @@ get "/sub1/sub2/page-class.html" do
   haml :"page-classes.html", :layout => false
 end
 
-get "/auto-css.html" do
-  haml :"auto-css.html", :layout => false
+%w{
+	/auto-css.html
+	/auto-css
+	/auto-css/
+	/auto-css/auto-css.html
+	/auto-css/sub/auto-css.html
+}.each do |path|
+	get path do
+		haml :"auto-css.html", :layout => false
+	end
 end
 
-get "/sub1/auto-css.html" do
-  haml :"auto-css.html", :layout => false
+%w{
+	/auto-js.html
+	/auto-js
+	/auto-js/
+	/auto-js/auto-js.html
+	/auto-js/sub/auto-js.html
+}.each do |path|
+	get path do
+		haml :"auto-js.html", :layout => false
+	end
 end
 
-get "/sub1/sub2/auto-css.html" do
-  haml :"auto-css.html", :layout => false
-end

fixtures/test-app/source/auto-js.html.haml

@@ -0,0 +1 @@
+= auto_javascript_include_tag

lib/middleman/features/default_helpers.rb

@@ -7,21 +7,35 @@ module Middleman::Features::DefaultHelpers
   end
   
   module Helpers
-    def auto_stylesheet_link_tag(separator="/")
+		def auto_stylesheet_link_tag(separator="/")
+			auto_tag(:css, separator) do |path|
+        stylesheet_link_tag path
+			end
+    end
+		
+    def auto_javascript_include_tag(separator="/")
+      auto_tag(:js, separator) do |path|
+        javascript_include_tag path
+      end
+    end
+
+    def auto_tag(asset_ext, separator="/", asset_dir=nil)
+      if asset_dir.nil?
+        asset_dir = case asset_ext
+          when :js  then self.class.js_dir
+          when :css then self.class.css_dir
+        end
+      end
       path = request.path_info.dup
-      path << self.class.index_file if path.match(%r{/$})
+			# If the basename of the request as no extension, assume we are serving a
+			# directory and join index_file to the path.
+			path = File.join(path, self.class.index_file) if File.extname(path).empty?
       path = path.gsub(%r{^/}, '')
-      path = path.gsub(File.extname(path), '')
+      path = path.gsub(File.extname(path), ".#{asset_ext}")
       path = path.gsub("/", separator)
 
-      css_file = File.join(self.class.views, self.class.css_dir, "#{path}.css")
-      sass_file = File.join(self.class.views, self.class.css_dir, "#{path}.css.sass")
-      scss_file = File.join(self.class.views, self.class.css_dir, "#{path}.css.scss")
-      less_file = File.join(self.class.views, self.class.css_dir, "#{path}.css.less")
-    
-      if File.exists?(css_file) || File.exists?(sass_file) || File.exists?(scss_file) || File.exists?(less_file)
-        stylesheet_link_tag "#{path}.css"
-      end
+			views = Dir[File.join(self.class.views, asset_dir, "#{path}*")]
+      yield path if views.any?
     end
 
     def page_classes