Widgets only create script and style tags when necessary

Yesod/Form.hs

@@ -398,7 +398,7 @@ jqueryDayFieldProfile = FieldProfile
         addScriptRemote "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"
         addScriptRemote "http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"
         addStylesheetRemote "http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/themes/cupertino/jquery-ui.css"
-        addHead [$hamlet|%script $$(function(){$$("#$name$").datepicker({dateFormat:'yy-mm-dd'})})|]
+        addJavaScript [$hamlet|$$(function(){$$("#$name$").datepicker({dateFormat:'yy-mm-dd'})});|]
     , fpName = Nothing
     , fpLabel = mempty
     , fpTooltip = mempty
@@ -535,7 +535,7 @@ nicHtmlFieldProfile = FieldProfile
 |]
     , fpWidget = \name -> do
         addScriptRemote "http://js.nicedit.com/nicEdit-latest.js"
-        addHead [$hamlet|%script bkLib.onDomLoaded(function(){new nicEditor({fullPanel:true}).panelInstance("$name$")})|]
+        addJavaScript [$hamlet|bkLib.onDomLoaded(function(){new nicEditor({fullPanel:true}).panelInstance("$name$")});|]
     , fpName = Nothing
     , fpLabel = mempty
     , fpTooltip = mempty
@@ -787,7 +787,7 @@ jqueryAutocompleteFieldProfile src = FieldProfile
         addScriptRemote "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"
         addScriptRemote "http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"
         addStylesheetRemote "http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/themes/cupertino/jquery-ui.css"
-        addHead [$hamlet|%script $$(function(){$$("#$name$").autocomplete({source:"@src@",minLength:2})});|]
+        addJavaScript [$hamlet|$$(function(){$$("#$name$").autocomplete({source:"@src@",minLength:2})});|]
     , fpName = Nothing
     , fpLabel = mempty
     , fpTooltip = mempty

Yesod/Widget.hs

@@ -60,13 +60,13 @@ newtype Script url = Script { unScript :: Location url }
 newtype Stylesheet url = Stylesheet { unStylesheet :: Location url }
     deriving (Show, Eq)
 newtype Title = Title { unTitle :: Html () }
-newtype Style url = Style (Hamlet url)
+newtype Style url = Style (Maybe (Hamlet url))
     deriving Monoid
 newtype Head url = Head (Hamlet url)
     deriving Monoid
 newtype Body url = Body (Hamlet url)
     deriving Monoid
-newtype JavaScript url = JavaScript (Hamlet url)
+newtype JavaScript url = JavaScript (Maybe (Hamlet url))
     deriving Monoid
 
 newtype GWidget sub master a = GWidget (
@@ -103,7 +103,7 @@ newIdent = GWidget $ lift $ lift $ lift $ lift $ lift $ lift $ lift $ do
     return $ "w" ++ show i'
 
 addStyle :: Hamlet (Route master) -> GWidget sub master ()
-addStyle = GWidget . lift . lift . lift . lift . tell . Style
+addStyle = GWidget . lift . lift . lift . lift . tell . Style . Just
 
 addStylesheet :: Route master -> GWidget sub master ()
 addStylesheet = GWidget . lift . lift . lift . tell . toUnique . Stylesheet . Local
@@ -120,7 +120,8 @@ addScriptRemote =
     GWidget . lift . lift . tell . toUnique . Script . Remote
 
 addJavaScript :: Hamlet (Route master) -> GWidget sub master ()
-addJavaScript = GWidget . lift . lift . lift . lift . lift. tell . JavaScript
+addJavaScript = GWidget . lift . lift . lift . lift . lift. tell
+              . JavaScript . Just
 
 applyLayoutW :: (Eq (Route m), Yesod m)
              => GWidget sub m () -> GHandler sub m RepHtml
@@ -150,8 +151,10 @@ $forall scripts s
     %script!src=^s^
 $forall stylesheets s
     %link!rel=stylesheet!href=^s^
-%style ^style^
-%script ^jscript^
+$maybe style s
+    %style ^s^
+$maybe jscript j
+    %script ^j^
 ^head'^
 |]
     return $ PageContent title head'' body

hellowidget.hs

@@ -34,7 +34,6 @@ getRootR = applyLayoutW $ flip wrapWidget wrapper $ do
 |]
     addHead [$hamlet|%meta!keywords=haskell|]
 
--- FIXME add coolness to day and html below
 handleFormR = do
     (res, form, enctype) <- runFormPost $ (,,,,,,,)
         <$> stringField (string "My Field") (string "Some tooltip info") Nothing
@@ -52,6 +51,7 @@ handleFormR = do
                     _ -> Nothing
     applyLayoutW $ do
         addStyle [$hamlet|\.tooltip{color:#666;font-style:italic}|]
+        addStyle [$hamlet|textarea.html{width:300px;height:150px};|]
         wrapWidget (fieldsToTable form) $ \h -> [$hamlet|
 %form!method=post!enctype=$show.enctype$
     %table