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Plugins.hs
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Plugins.hs
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{-# LANGUAGE CPP #-}
{-
Copyright (C) 2009 John MacFarlane <[email protected]>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
-}
{- Functions for loading plugins.
-}
module Gitit.Plugins ( loadPlugin )
where
import Gitit.State
import System.FilePath
#ifdef _PLUGINS
import Control.Monad (when)
import Data.List (isInfixOf, isPrefixOf)
import GHC
import GHC.Paths
import DynFlags
import Unsafe.Coerce
loadPlugin :: FilePath -> IO Plugin
loadPlugin pluginName = do
plugin <- defaultCleanupHandler defaultDynFlags $ do
runGhc (Just libdir) $ do
dflags <- getSessionDynFlags
setSessionDynFlags dflags
when (not $ "Gitit.Plugin." `isPrefixOf` pluginName)
$ do
addTarget =<< guessTarget pluginName Nothing
r <- load LoadAllTargets
case r of
Failed -> error $ "Error loading plugin: " ++ pluginName
Succeeded -> return ()
let modName =
if "Gitit.Plugin" `isPrefixOf` pluginName
then pluginName
else
(if "Gitit/Plugin/" `isInfixOf` pluginName then ("Gitit.Plugin." ++) else id)
$ takeBaseName pluginName
pr <- findModule (mkModuleName "Prelude") Nothing
i <- findModule (mkModuleName "Gitit.Interface") Nothing
m <- findModule (mkModuleName modName) Nothing
setContext [] [m, i, pr]
value <- compileExpr (modName ++ ".plugin :: Plugin")
let value' = (unsafeCoerce value) :: Plugin
return value'
return plugin
#else
loadPlugin :: FilePath -> IO Plugin
loadPlugin pluginName = do
error $ "Cannot load plugin '" ++ pluginName ++ "'. gitit was not compiled with plugin support."
return undefined
#endif