241c7946fc
The problem the reverted commit tried to fix seems to have been just a
symptom of another root cause that was later fixed as the problem does
not seem to occur anymore even without this changeset also this
changeset broke cabal sandboxes with ghc < 7.8.
Fix #262
This reverts commit 8741323f5b.
Conflicts:
Language/Haskell/GhcMod/GhcPkg.hs
98 lines
3.5 KiB
Haskell
98 lines
3.5 KiB
Haskell
{-# LANGUAGE BangPatterns, ScopedTypeVariables, TupleSections #-}
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module Language.Haskell.GhcMod.GhcPkg (
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ghcPkgDbOpt
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, ghcPkgDbStackOpts
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, ghcDbStackOpts
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, ghcDbOpt
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, fromInstalledPackageId
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, fromInstalledPackageId'
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, getSandboxDb
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, getPackageDbStack
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) where
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import Config (cProjectVersionInt)
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import Control.Applicative ((<$>))
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import Control.Exception (SomeException(..))
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import qualified Control.Exception as E
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import Data.Char (isSpace)
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import Data.List (isPrefixOf, intercalate)
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import Data.List.Split (splitOn)
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import Distribution.Package (InstalledPackageId(..))
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import Language.Haskell.GhcMod.Types
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import Language.Haskell.GhcMod.Utils
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import System.FilePath ((</>))
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ghcVersion :: Int
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ghcVersion = read cProjectVersionInt
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-- | Get path to sandbox package db
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getSandboxDb :: FilePath -- ^ Path to the cabal package root directory
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-- (containing the @cabal.sandbox.config@ file)
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-> IO FilePath
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getSandboxDb cdir = getSandboxDbDir (cdir </> "cabal.sandbox.config")
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-- | Extract the sandbox package db directory from the cabal.sandbox.config file.
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-- Exception is thrown if the sandbox config file is broken.
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getSandboxDbDir :: FilePath -- ^ Path to the @cabal.sandbox.config@ file
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-> IO FilePath
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getSandboxDbDir sconf = do
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-- Be strict to ensure that an error can be caught.
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!path <- extractValue . parse <$> readFile sconf
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return path
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where
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key = "package-db:"
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keyLen = length key
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parse = head . filter (key `isPrefixOf`) . lines
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extractValue = dropWhileEnd isSpace . dropWhile isSpace . drop keyLen
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getPackageDbStack :: FilePath -- ^ Project Directory (where the
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-- cabal.sandbox.config file would be if it
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-- exists)
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-> IO [GhcPkgDb]
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getPackageDbStack cdir =
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(getSandboxDb cdir >>= \db -> return [GlobalDb, PackageDb db])
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`E.catch` \(_ :: SomeException) -> return [GlobalDb, UserDb]
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fromInstalledPackageId' :: InstalledPackageId -> Maybe Package
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fromInstalledPackageId' pid = let
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InstalledPackageId pkg = pid
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in case reverse $ splitOn "-" pkg of
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i:v:rest -> Just (intercalate "-" (reverse rest), v, i)
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_ -> Nothing
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fromInstalledPackageId :: InstalledPackageId -> Package
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fromInstalledPackageId pid =
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case fromInstalledPackageId' pid of
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Just p -> p
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Nothing -> error $
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"fromInstalledPackageId: `"++show pid++"' is not a valid package-id"
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-- | Get options needed to add a list of package dbs to ghc-pkg's db stack
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ghcPkgDbStackOpts :: [GhcPkgDb] -- ^ Package db stack
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-> [String]
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ghcPkgDbStackOpts dbs = ghcPkgDbOpt `concatMap` dbs
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-- | Get options needed to add a list of package dbs to ghc's db stack
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ghcDbStackOpts :: [GhcPkgDb] -- ^ Package db stack
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-> [String]
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ghcDbStackOpts dbs = ghcDbOpt `concatMap` dbs
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ghcPkgDbOpt :: GhcPkgDb -> [String]
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ghcPkgDbOpt GlobalDb = ["--global"]
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ghcPkgDbOpt UserDb = ["--user"]
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ghcPkgDbOpt (PackageDb pkgDb)
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| ghcVersion < 706 = ["--no-user-package-conf", "--package-conf=" ++ pkgDb]
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| otherwise = ["--no-user-package-db", "--package-db=" ++ pkgDb]
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ghcDbOpt :: GhcPkgDb -> [String]
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ghcDbOpt GlobalDb
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| ghcVersion < 706 = ["-global-package-conf"]
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| otherwise = ["-global-package-db"]
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ghcDbOpt UserDb
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| ghcVersion < 706 = ["-user-package-conf"]
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| otherwise = ["-user-package-db"]
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ghcDbOpt (PackageDb pkgDb)
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| ghcVersion < 706 = ["-no-user-package-conf", "-package-conf", pkgDb]
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| otherwise = ["-no-user-package-db", "-package-db", pkgDb]
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