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{-# LANGUAGE OverloadedStrings #-}
import Hakyll
import Control.Monad ((>=>))
import Data.Foldable (traverse_)
import Data.Maybe (fromMaybe)
import System.FilePath ((</>), dropTrailingPathSeparator, normalise)
import Debug.Trace
getMount :: Metadata -> Routes
getMount = maybe idRoute constRoute . lookupString "mount"
indexInDir :: Routes -> Routes
indexInDir = flip composeRoutes . customRoute $ (</> "index.html") . toFilePath
extractRedirs :: Identifier -> Rules (Identifier, [Identifier])
extractRedirs ident = do
md <- getMetadata ident
let to = fromMaybe ident $ fromFilePath <$> lookupString "mount" md
froms =
fromMaybe [] $
map (fromFilePath . dropTrailingPathSeparator . normalise) <$>
lookupStringList "redirects" md
pure (to, froms)
makePage :: Rules ()
makePage = do
route $ indexInDir (metadataRoute getMount)
compile $
pandocCompiler >>= loadAndApplyTemplate "templates/page.html" pageCtx >>=
loadAndApplyTemplate "templates/default.html" pageCtx >>=
relativizeUrls
makeRedirects :: Identifier -> [Identifier] -> Rules ()
makeRedirects to froms =
create froms $ do
route $ indexInDir idRoute
compile . makeItem . Redirect . ('/' :) . toFilePath $ to
spawnRedirects :: [Identifier] -> Rules ()
spawnRedirects = traverse_ (extractRedirs >=> uncurry makeRedirects)
main :: IO ()
main =
hakyll $
{- Source the pages -}
do
match "external/**/*.md" makePage
{- Source and process the redirects -}
getMatches "external/**/*.md" >>= spawnRedirects
{- Compile the templates (no routing, cache-only) -}
match "templates/*" $ compile templateBodyCompiler
pageCtx :: Context String
pageCtx = defaultContext
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