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-- | Module describing the Hakyll monad stack.
module Text.Hakyll.HakyllMonad
( HakyllConfiguration (..)
, Hakyll
, askHakyll
, getAdditionalContext
) where
import Control.Monad.Reader (ReaderT, ask)
import Control.Monad (liftM)
import qualified Data.Map as M
import Text.Hakyll.Context (Context)
-- | Our custom monad stack.
type Hakyll = ReaderT HakyllConfiguration IO
-- | Hakyll global configuration type.
data HakyllConfiguration = HakyllConfiguration
{ -- | Absolute URL of the site.
absoluteUrl :: String
, -- | An additional context to use when rendering. This additional context
-- is used globally.
additionalContext :: Context
, -- | Directory where the site is placed.
siteDirectory :: FilePath
, -- | Directory for cache files.
cacheDirectory :: FilePath
, -- | Enable index links.
enableIndexUrl :: Bool
, -- | Delay between polls in preview mode.
previewPollDelay :: Int
}
-- | Simplified @ask@ function for the Hakyll monad stack.
--
-- Usage would typically be something like:
--
-- > doSomething :: a -> b -> Hakyll c
-- > doSomething arg1 arg2 = do
-- > siteDirectory' <- askHakyll siteDirectory
-- > ...
--
askHakyll :: (HakyllConfiguration -> a) -> Hakyll a
askHakyll = flip liftM ask
getAdditionalContext :: HakyllConfiguration -> Context
getAdditionalContext configuration =
M.insert "absolute" (absoluteUrl configuration)
(additionalContext configuration)
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