Add "extname" option to javascript_include_tag

ActionView::Helpers.asset_path is where the logic for
javascript_include_tag resides.  It takes an extname option for
specifying the extension or false to not append it.  This exposes that
option to javascript_include_tag.

Without the option files that didn't end with ".js" would get the
extension appended to them.  This broke JST templates and other file
types that should be interpreted as JavaScript but who's file extension
isn't ".js"

actionview/CHANGELOG.md

@@ -1,3 +1,17 @@
+*   Added an `extname` hash option for `javascript_include_tag` method.
+
+    Before:
+
+        javascript_include_tag('templates.jst')
+        # => <script src="/javascripts/templates.jst.js"></script>
+
+    After:
+
+        javascript_include_tag('templates.jst', extname: false )
+        # => <script src="/javascripts/templates.jst"></script>
+
+    *Nathan Stitt*
+
 *   Fix `current_page?` when the URL contains escaped characters and the
     original URL is using the hexadecimal lowercased.
 

actionview/lib/action_view/helpers/asset_tag_helper.rb

@@ -26,7 +26,8 @@ module ActionView
       # to <tt>assets/javascripts</tt>, full paths are assumed to be relative to the document
       # root. Relative paths are idiomatic, use absolute paths only when needed.
       #
-      # When passing paths, the ".js" extension is optional.
+      # When passing paths, the ".js" extension is optional.  If you do not want ".js"
+      # appended to the path <tt>extname: false</tt> can be set on the options.
       #
       # You can modify the HTML attributes of the script tag by passing a hash as the
       # last argument.
@@ -37,6 +38,9 @@ module ActionView
       #   javascript_include_tag "xmlhr"
       #   # => <script src="/assets/xmlhr.js?1284139606"></script>
       #
+      #   javascript_include_tag "template.jst", extname: false
+      #   # => <script src="/assets/template.jst?1284139606"></script>
+      #
       #   javascript_include_tag "xmlhr.js"
       #   # => <script src="/assets/xmlhr.js?1284139606"></script>
       #
@@ -51,8 +55,7 @@ module ActionView
       #   # => <script src="http://www.example.com/xmlhr.js"></script>
       def javascript_include_tag(*sources)
         options = sources.extract_options!.stringify_keys
-        path_options = options.extract!('protocol').symbolize_keys
+        path_options = options.extract!('protocol', 'extname').symbolize_keys
-
         sources.uniq.map { |source|
           tag_options = {
             "src" => path_to_javascript(source, path_options)

actionview/test/template/javascript_helper_test.rb

@@ -51,6 +51,13 @@ class JavaScriptHelperTest < ActionView::TestCase
     assert_equal 'foo', output_buffer, 'javascript_tag without a block should not concat to output_buffer'
   end
 
+  # Setting the :extname option will control what extension (if any) is appended to the url for assets
+  def test_javascript_include_tag
+    assert_dom_equal "<script src='/foo.js'></script>",  javascript_include_tag('/foo')
+    assert_dom_equal "<script src='/foo'></script>",     javascript_include_tag('/foo', extname: false )
+    assert_dom_equal "<script src='/foo.bar'></script>", javascript_include_tag('/foo', extname: '.bar' )
+  end
+
   def test_javascript_tag_with_options
     assert_dom_equal "<script id=\"the_js_tag\">\n//<![CDATA[\nalert('hello')\n//]]>\n</script>",
       javascript_tag("alert('hello')", :id => "the_js_tag")