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|
module Text.Hakyll.Render
( depends
, render
, renderWith
, renderAndConcat
, renderAndConcatWith
, renderChain
, renderChainWith
, static
, css
) where
import Control.Monad (unless, mapM, foldM)
import System.Directory (copyFile)
import System.IO
import Text.Hakyll.Context (ContextManipulation)
import Text.Hakyll.Page
import Text.Hakyll.Renderable
import Text.Hakyll.File
import Text.Hakyll.CompressCSS
import Text.Hakyll.Render.Internal
-- | 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 IO () -- ^ IO action to execute when the file is out of date.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 = renderWith id
-- | Render to a Page. This function allows you to manipulate the context
-- first.
renderWith :: Renderable a
=> ContextManipulation -- ^ Manipulation to apply on the context.
-> 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.
renderWith manipulation templatePath renderable = do
template <- readFile templatePath
context <- toContext renderable
return $ fromContext $ pureRenderWith manipulation template context
-- | Render each renderable with the given template, then concatenate the
-- result.
renderAndConcat :: Renderable a => FilePath -> [a] -> IO String
renderAndConcat = renderAndConcatWith id
-- | Render each renderable with the given template, then concatenate the
-- result. This function allows you to specify a "ContextManipulation" to
-- apply on every "Renderable".
renderAndConcatWith :: Renderable a
=> ContextManipulation
-> FilePath
-> [a]
-> IO String
renderAndConcatWith manipulation templatePath renderables =
foldM concatRender' [] renderables
where
concatRender' :: Renderable a => String -> a -> IO String
concatRender' chunk renderable = do
rendered <- renderWith manipulation templatePath renderable
let body = getBody rendered
return $ 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 = renderChainWith id
-- | A more custom render chain that allows you to specify a
-- "ContextManipulation" which to apply on the context when it is read first.
renderChainWith :: Renderable a
=> ContextManipulation -> [FilePath] -> a -> IO ()
renderChainWith manipulation templatePaths renderable =
depends (getURL renderable) (getDependencies renderable ++ templatePaths) $
do templates <- mapM readFile templatePaths
context <- toContext renderable
let result = pureRenderChainWith manipulation templates context
writePage $ fromContext 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] action
where
destination = toDestination source
action = do makeDirectories destination
copyFile source destination
-- | Render a css file, compressing it.
css :: FilePath -> IO ()
css source = depends destination [source] css'
where
destination = toDestination source
css' = do contents <- readFile source
makeDirectories destination
writeFile destination (compressCSS contents)
|
