61 lines
1.8 KiB
Haskell
61 lines
1.8 KiB
Haskell
-- | A page is an important concept in Hakyll: it has a body (usually of the
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-- type 'String') and number of metadata fields. This type is used to represent
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-- pages on your website.
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--
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{-# LANGUAGE DeriveDataTypeable #-}
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module Hakyll.Web.Page
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( Page (..)
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, addField
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, toMap
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, pageRead
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, addDefaultFields
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) where
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import Prelude hiding (id)
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import Control.Category (id)
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import Control.Arrow ((>>^), (&&&), (>>>))
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import Control.Applicative ((<$>))
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import System.FilePath (takeBaseName)
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import Data.Maybe (fromMaybe)
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import Data.Map (Map)
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import qualified Data.Map as M
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import Hakyll.Core.Identifier
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import Hakyll.Core.Compiler
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import Hakyll.Web.Page.Internal
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import Hakyll.Web.Page.Read
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import Hakyll.Web.Util.String
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-- | Add a metadata field. If the field already exists, it is not overwritten.
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--
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addField :: String -- ^ Key
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-> String -- ^ Value
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-> Page a -- ^ Page to add it to
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-> Page a -- ^ Resulting page
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addField k v (Page m b) = Page (M.insertWith (flip const) k v m) b
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-- | Convert a page to a map. The body will be placed in the @body@ key.
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--
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toMap :: Page String -> Map String String
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toMap (Page m b) = M.insert "body" b m
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-- | Read a page (do not render it)
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--
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pageRead :: Compiler a (Page String)
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pageRead = getResourceString >>^ readPage
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-- | Add a number of default metadata fields to a page. These fields include:
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--
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-- * @$url@
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--
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-- * @$root@
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--
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-- * @$title@
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--
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addDefaultFields :: Compiler (Page a) (Page a)
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addDefaultFields = (getRoute &&& id >>^ uncurry addRoute)
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>>> (getIdentifier &&& id >>^ uncurry addTitle)
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where
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addRoute r = addField "url" (fromMaybe "?" r)
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. addField "root" (fromMaybe "/" $ toSiteRoot <$> r)
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addTitle i = addField "title" (takeBaseName $ toFilePath i)
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