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-- | A page is an important concept in Hakyll: it has a body (usually of the
-- type 'String') and number of metadata fields. This type is used to represent
-- pages on your website.
--
{-# LANGUAGE DeriveDataTypeable #-}
module Hakyll.Web.Page
( Page (..)
, fromBody
, fromMap
, toMap
, pageRead
, addDefaultFields
, sortByBaseName
) where
import Prelude hiding (id)
import Control.Category (id)
import Control.Arrow ((>>^), (&&&), (>>>))
import System.FilePath (takeBaseName, takeDirectory)
import Data.Monoid (Monoid, mempty)
import Data.Map (Map)
import qualified Data.Map as M
import Data.List (sortBy)
import Data.Ord (comparing)
import Hakyll.Core.Identifier
import Hakyll.Core.Compiler
import Hakyll.Web.Page.Internal
import Hakyll.Web.Page.Read
import Hakyll.Web.Page.Metadata
import Hakyll.Web.Util.String
-- | Create a page from a body, without metadata
--
fromBody :: a -> Page a
fromBody = Page M.empty
-- | Create a metadata page, without a body
--
fromMap :: Monoid a => Map String String -> Page a
fromMap m = Page m mempty
-- | Convert a page to a map. The body will be placed in the @body@ key.
--
toMap :: Page String -> Map String String
toMap (Page m b) = M.insert "body" b m
-- | Read a page (do not render it)
--
pageRead :: Compiler a (Page String)
pageRead = getResourceString >>^ readPage
-- | Add a number of default metadata fields to a page. These fields include:
--
-- * @$url@
--
-- * @$category@
--
-- * @$title@
--
-- * @$path@
--
addDefaultFields :: Compiler (Page a) (Page a)
addDefaultFields = (getRoute &&& id >>^ uncurry addRoute)
>>> (getIdentifier &&& id >>^ uncurry addIdentifier)
where
-- Add root and url, based on route
addRoute Nothing = id
addRoute (Just r) = setField "url" (toUrl r)
-- Add title and category, based on identifier
addIdentifier i = setField "title" (takeBaseName p)
. setField "category" (takeBaseName $ takeDirectory p)
. setField "path" p
where
p = toFilePath i
-- | Sort posts based on the basename of the post. This is equivalent to a
-- chronologival sort, because of the @year-month-day-title.extension@ naming
-- convention in Hakyll.
--
sortByBaseName :: [Page a] -> [Page a]
sortByBaseName = sortBy $ comparing $ takeBaseName . getField "path"
|
