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module Text.Hakyll.Render
( depends
, render
, renderAndConcat
, renderChain
, static
, css
) where
import Text.Template hiding (render)
import qualified Data.ByteString.Lazy.Char8 as B
import qualified Data.Map as M
import Control.Monad (unless, liftM, foldM)
import System.Directory (copyFile)
import System.IO
import Text.Hakyll.Page
import Text.Hakyll.Renderable
import Text.Hakyll.File
import Text.Hakyll.CompressCSS
-- | Execute an IO action only when the cache is invalid.
depends :: FilePath -- ^ File to be rendered or created.
-> [FilePath] -- ^ Files the render depends on.
-> IO () -- ^ IO action to execute when the file is out of date.
-> IO ()
depends file dependencies action = do
valid <- isCacheValid (toDestination file) dependencies
unless valid action
-- | Render to a Page.
render :: Renderable a
=> FilePath -- ^ Template to use for rendering.
-> a -- ^ Renderable object to render with given template.
-> IO Page -- ^ The body of the result will contain the render.
render templatePath renderable = do
handle <- openFile templatePath ReadMode
templateString <- liftM B.pack $ hGetContents handle
seq templateString $ hClose handle
context <- toContext renderable
let body = substitute templateString context
return $ fromContext (M.insert (B.pack "body") body context)
-- | Render each renderable with the given template, then concatenate the
-- result.
renderAndConcat :: Renderable a => FilePath -> [a] -> IO B.ByteString
renderAndConcat templatePath renderables = foldM concatRender' B.empty renderables
where concatRender' :: Renderable a => B.ByteString -> a -> IO B.ByteString
concatRender' chunk renderable = do
rendered <- render templatePath renderable
let body = getBody rendered
return $ B.append chunk $ body
-- | Chain a render action for a page with a number of templates. This will
-- also write the result to the site destination. This is the preferred way
-- to do general rendering.
renderChain :: Renderable a => [FilePath] -> a -> IO ()
renderChain templates renderable =
depends (getURL renderable) (getDependencies renderable ++ templates) $
do initialPage <- toContext renderable
result <- foldM (flip render) (fromContext initialPage) templates
writePage result
-- | Mark a certain file as static, so it will just be copied when the site is
-- generated.
static :: FilePath -> IO ()
static source = depends destination [source]
(makeDirectories destination >> copyFile source destination)
where destination = toDestination source
-- | Render a css file, compressing it.
css :: FilePath -> IO ()
css source = depends destination [source] css'
where destination = toDestination source
css' = do h <- openFile source ReadMode
contents <- hGetContents h
makeDirectories destination
writeFile destination (compressCSS contents)
|
