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Document IsString instance for WidgetT.

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This commit is contained in:
Christopher Reichert 2015-07-21 11:50:21 -05:00
parent 4e354c9e07
commit 66ed314866
1 changed files with 8 additions and 1 deletions
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9
yesod-core/Yesod/Core/Types.hs
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@ -250,9 +250,16 @@ instance (a ~ (), Monad m) => Monoid (WidgetT site m a) where
mempty = return ()
mappend x y = x >> y
instance (a ~ (), Monad m) => Semigroup (WidgetT site m a)
-- | Any type with an 'IsString' instance can be trivially
-- promoted to a widget.
--
-- For example, in a yesod-scaffold site you could use:
--
-- @getHomeR = do defaultLayout "Widget text"@
instance (Monad m, a ~ ()) => IsString (WidgetT site m a) where
fromString = toWidget . toHtml . T.pack
where toWidget x = WidgetT $ const $ return $ ((), GWData (Body (const x))
where toWidget x = WidgetT $ const $ return $ ((), GWData (Body (const x))
mempty mempty mempty mempty mempty mempty)
type RY master = Route master -> [(Text, Text)] -> Text