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--------------------------------------------------------------------------------
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Hakyll.Core.Compiler
( Compiler
, getUnderlying
, makeItem
, getRoute
, getResourceBody
, getResourceString
, getResourceLBS
, getResourceWith
, Internal.Snapshot
, saveSnapshot
, Internal.require
, Internal.requireSnapshot
, Internal.requireBody
, Internal.requireSnapshotBody
, Internal.requireAll
, Internal.requireAllSnapshots
, cached
, unsafeCompiler
, debugCompiler
) where
--------------------------------------------------------------------------------
import Control.Applicative ((<$>))
import Data.Binary (Binary)
import Data.ByteString.Lazy (ByteString)
import Data.Typeable (Typeable)
import Prelude hiding (id, (.))
import System.Environment (getProgName)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler.Internal
import qualified Hakyll.Core.Compiler.Require as Internal
import Hakyll.Core.Identifier
import Hakyll.Core.Item
import Hakyll.Core.Logger as Logger
import Hakyll.Core.Provider
import Hakyll.Core.Routes
import qualified Hakyll.Core.Store as Store
--------------------------------------------------------------------------------
-- | Get the underlying identifier. Only use this if you know what you're doing.
getUnderlying :: Compiler Identifier
getUnderlying = compilerUnderlying <$> compilerAsk
--------------------------------------------------------------------------------
makeItem :: a -> Compiler (Item a)
makeItem x = do
identifier <- getUnderlying
return $ Item identifier x
--------------------------------------------------------------------------------
-- | Get the route for a specified item
getRoute :: Identifier -> Compiler (Maybe FilePath)
getRoute identifier = do
routes <- compilerRoutes <$> compilerAsk
return $ runRoutes routes identifier
--------------------------------------------------------------------------------
-- | Get the body of the underlying resource
getResourceBody :: Compiler (Item String)
getResourceBody = getResourceWith resourceBody
--------------------------------------------------------------------------------
-- | Get the resource we are compiling as a string
getResourceString :: Compiler (Item String)
getResourceString = getResourceWith resourceString
--------------------------------------------------------------------------------
-- | Get the resource we are compiling as a lazy bytestring
getResourceLBS :: Compiler (Item ByteString)
getResourceLBS = getResourceWith resourceLBS
--------------------------------------------------------------------------------
-- | Overloadable function for 'getResourceString' and 'getResourceLBS'
getResourceWith :: (Provider -> Identifier -> IO a) -> Compiler (Item a)
getResourceWith reader = do
provider <- compilerProvider <$> compilerAsk
id' <- compilerUnderlying <$> compilerAsk
let filePath = toFilePath id'
if resourceExists provider id'
then compilerUnsafeIO $ Item id' <$> reader provider id'
else compilerThrow $ error' filePath
where
error' fp = "Hakyll.Core.Compiler.getResourceWith: resource " ++
show fp ++ " not found"
--------------------------------------------------------------------------------
saveSnapshot :: (Binary a, Typeable a)
=> Internal.Snapshot -> Item a -> Compiler ()
saveSnapshot snapshot item = do
store <- compilerStore <$> compilerAsk
compilerUnsafeIO $ Internal.saveSnapshot store snapshot item
--------------------------------------------------------------------------------
cached :: (Binary a, Typeable a)
=> String
-> Compiler a
-> Compiler a
cached name compiler = do
id' <- compilerUnderlying <$> compilerAsk
store <- compilerStore <$> compilerAsk
provider <- compilerProvider <$> compilerAsk
modified <- compilerUnsafeIO $ resourceModified provider id'
if modified
then do
x <- compiler
compilerUnsafeIO $ Store.set store [name, show id'] x
return x
else do
compilerTellCacheHits 1
x <- compilerUnsafeIO $ Store.get store [name, show id']
progName <- compilerUnsafeIO getProgName
case x of Store.Found x' -> return x'
_ -> compilerThrow (error' progName)
where
error' progName =
"Hakyll.Core.Compiler.cached: Cache corrupt! " ++
"Try running: " ++ progName ++ " clean"
--------------------------------------------------------------------------------
unsafeCompiler :: IO a -> Compiler a
unsafeCompiler = compilerUnsafeIO
--------------------------------------------------------------------------------
-- | Compiler for debugging purposes
debugCompiler :: String -> Compiler ()
debugCompiler msg = do
logger <- compilerLogger <$> compilerAsk
compilerUnsafeIO $ Logger.debug logger msg
|
