105 lines
3.5 KiB
Haskell
105 lines
3.5 KiB
Haskell
{-# LANGUAGE OverloadedStrings #-}
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module Cabal (initializeGHC) where
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import Control.Applicative
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import Control.Exception
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import Control.Monad
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import CoreMonad
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import Data.List
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import Data.Maybe
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import Distribution.PackageDescription
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import Distribution.PackageDescription.Parse (readPackageDescription)
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import Distribution.Verbosity (silent)
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import ErrMsg
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import GHC
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import GHCApi
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import GHCChoice
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import qualified Gap
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import Language.Haskell.Extension
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import System.Directory
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import System.FilePath
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import Types
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----------------------------------------------------------------
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importDirs :: [String]
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importDirs = [".","..","../..","../../..","../../../..","../../../../.."]
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initializeGHC :: Options -> FilePath -> [String] -> Bool -> Ghc (FilePath,LogReader)
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initializeGHC opt fileName ghcOptions logging = withCabal ||> withoutCabal
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where
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withoutCabal = do
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logReader <- initSession opt ghcOptions importDirs logging
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return (fileName,logReader)
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withCabal = do
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(owdir,cdir,cfile) <- liftIO getDirs
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binfo <- liftIO $ parseCabalFile cfile
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let (idirs',exts',mlang) = extractBuildInfo binfo
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exts = map (addX . Gap.extensionToString) exts'
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lang = maybe "-XHaskell98" (addX . show) mlang
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gopts = ghcOptions ++ exts ++ [lang]
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changeToCabalDirectory cdir
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let idirs = case idirs' of
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[] -> [cdir,owdir]
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dirs -> dirs ++ [owdir]
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file = ajustFileName fileName owdir cdir
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logReader <- initSession opt gopts idirs logging
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return (file,logReader)
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addX = ("-X" ++)
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----------------------------------------------------------------
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-- Causes error, catched in the upper function.
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parseCabalFile :: FilePath -> IO BuildInfo
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parseCabalFile file = do
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cabal <- readPackageDescription silent file
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return . fromJust $ fromLibrary cabal <|> fromExecutable cabal
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where
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fromLibrary c = libBuildInfo . condTreeData <$> condLibrary c
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fromExecutable c = buildInfo . condTreeData . snd <$> toMaybe (condExecutables c)
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toMaybe [] = Nothing
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toMaybe (x:_) = Just x
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-- SourceDirs, Extensions, and Language
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extractBuildInfo :: BuildInfo -> ([String],[Extension],Maybe Language)
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extractBuildInfo binfo = (hsSourceDirs binfo
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,oldExtensions binfo
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,defaultLanguage binfo)
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----------------------------------------------------------------
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ajustFileName :: FilePath -> FilePath -> FilePath -> FilePath
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ajustFileName name olddir newdir
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| olen == nlen = name
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| otherwise = drop (nlen+1) olddir </> name
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where
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olen = length olddir
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nlen = length newdir
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changeToCabalDirectory :: FilePath -> Ghc ()
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changeToCabalDirectory dir = do
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liftIO $ setCurrentDirectory dir
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workingDirectoryChanged
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-- CurrentWorkingDir, CabalDir, CabalFile
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getDirs :: IO (FilePath,FilePath,FilePath)
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getDirs = do
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wdir <- getCurrentDirectory
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(cdir,cfile) <- cabalDir wdir
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return (wdir,cdir,cfile)
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-- Causes error, catched in the upper function.
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-- CabalDir, CabalFile
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cabalDir :: FilePath -> IO (FilePath,FilePath)
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cabalDir dir = do
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cnts <- (filter isCabal <$> getDirectoryContents dir)
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>>= filterM (\file -> doesFileExist (dir </> file))
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let dir' = takeDirectory dir
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case cnts of
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[] | dir' == dir -> throwIO $ userError "No cabal file"
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| otherwise -> cabalDir dir'
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cfile:_ -> return (dir,dir </> cfile)
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where
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isCabal name = ".cabal" `isSuffixOf` name && length name > 6
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