diff options
Diffstat (limited to 'src/Hakyll/Web/Template/Context.hs')
| -rw-r--r-- | src/Hakyll/Web/Template/Context.hs | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/src/Hakyll/Web/Template/Context.hs b/src/Hakyll/Web/Template/Context.hs index ecf769d..cd52eb0 100644 --- a/src/Hakyll/Web/Template/Context.hs +++ b/src/Hakyll/Web/Template/Context.hs @@ -6,6 +6,8 @@ module Hakyll.Web.Template.Context , field , constField , listField + , functionField + , mapContext , defaultContext , bodyField @@ -86,6 +88,26 @@ listField key c xs = field' key $ \_ -> fmap (ListField c) xs -------------------------------------------------------------------------------- +functionField :: String -> ([String] -> Item a -> Compiler String) -> Context a +functionField name value = Context $ \k i -> case words k of + [] -> empty + (n : args) + | n == name -> StringField <$> value args i + | otherwise -> empty + + +-------------------------------------------------------------------------------- +mapContext :: (String -> String) -> Context a -> Context a +mapContext f (Context c) = Context $ \k i -> do + fld <- c k i + case fld of + StringField str -> return $ StringField (f str) + ListField _ _ -> fail $ + "Hakyll.Web.Template.Context.mapContext: " ++ + "can't map over a ListField!" + + +-------------------------------------------------------------------------------- defaultContext :: Context String defaultContext = bodyField "body" `mappend` @@ -108,7 +130,7 @@ bodyField key = field key $ return . itemBody -------------------------------------------------------------------------------- -- | Map any field to its metadata value, if present -metadataField :: Context String +metadataField :: Context a metadataField = Context $ \k i -> do value <- getMetadataField (itemIdentifier i) k maybe empty (return . StringField) value @@ -130,7 +152,7 @@ pathField key = field key $ return . toFilePath . itemIdentifier -------------------------------------------------------------------------------- -- | This title field takes the basename of the underlying file by default titleField :: String -> Context a -titleField key = field key $ return . takeBaseName . toFilePath . itemIdentifier +titleField = mapContext takeBaseName . pathField -------------------------------------------------------------------------------- |