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--------------------------------------------------------------------------------
-- | Provides an easy way to combine several items in a list. The applications
-- are obvious:
--
-- * A post list on a blog
--
-- * An image list in a gallery
--
-- * A sitemap
{-# LANGUAGE TupleSections #-}
module Hakyll.Web.Template.List
( applyTemplateList
, applyJoinTemplateList
, chronological
, recentFirst
, sortChronological
, sortRecentFirst
) where
--------------------------------------------------------------------------------
import Control.Monad (liftM)
import Data.List (intersperse, sortBy)
import Data.Ord (comparing)
import System.Locale (defaultTimeLocale)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Core.Metadata
import Hakyll.Web.Template
import Hakyll.Web.Template.Context
--------------------------------------------------------------------------------
-- | Generate a string of a listing of pages, after applying a template to each
-- page.
applyTemplateList :: Template
-> Context a
-> [Item a]
-> Compiler String
applyTemplateList = applyJoinTemplateList ""
--------------------------------------------------------------------------------
-- | Join a listing of pages with a string in between, after applying a template
-- to each page.
applyJoinTemplateList :: String
-> Template
-> Context a
-> [Item a]
-> Compiler String
applyJoinTemplateList delimiter tpl context items = do
items' <- mapM (applyTemplate tpl context) items
return $ concat $ intersperse delimiter $ map itemBody items'
--------------------------------------------------------------------------------
-- | Sort pages chronologically. Uses the same method as 'dateField' for
-- extracting the date.
chronological :: MonadMetadata m => [Item a] -> m [Item a]
chronological =
sortByM $ getItemUTC defaultTimeLocale . itemIdentifier
where
sortByM :: (Monad m, Ord k) => (a -> m k) -> [a] -> m [a]
sortByM f xs = liftM (map fst . sortBy (comparing snd)) $
mapM (\x -> liftM (x,) (f x)) xs
--------------------------------------------------------------------------------
-- | The reverse of 'chronological'
recentFirst :: MonadMetadata m => [Item a] -> m [Item a]
recentFirst = liftM reverse . chronological
--------------------------------------------------------------------------------
-- | Version of 'chronological' which doesn't need the actual items.
sortChronological
:: MonadMetadata m => [Identifier] -> m [Identifier]
sortChronological ids =
liftM (map itemIdentifier) $ chronological [Item i () | i <- ids]
--------------------------------------------------------------------------------
-- | Version of 'recentFirst' which doesn't need the actual items.
sortRecentFirst
:: MonadMetadata m => [Identifier] -> m [Identifier]
sortRecentFirst ids =
liftM (map itemIdentifier) $ recentFirst [Item i () | i <- ids]
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