diff options
author | Daniel Gröber <dxld@darkboxed.org> | 2017-09-18 01:23:22 +0200 |
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committer | Daniel Gröber <dxld@darkboxed.org> | 2017-09-18 01:35:40 +0200 |
commit | f864a5eae8262752162c6b0d124aea4601ed9ac1 (patch) | |
tree | 1b765d25741b6e47d4ad458c8041c0881dd353b8 /CabalHelper/Shared/Sandbox.hs | |
parent | 70d743eb6a8b7f8da182524fa0b2c4bf02399d50 (diff) |
Fix literally everything :)
Sorry for the megacommit
- Seperate modules into:
- Compiletime, modules which are only used while building the package
- Runtime, modues included in the wrapper binary to be compiled on the
users machine at runtime
- Shared, modues used in both contexts
- Refactor runtime compilation
- Completely revamp output paths
- Don't chdir when invoking ghc
- Require cabal-version 1.14 in cabal file
Diffstat (limited to 'CabalHelper/Shared/Sandbox.hs')
-rw-r--r-- | CabalHelper/Shared/Sandbox.hs | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/CabalHelper/Shared/Sandbox.hs b/CabalHelper/Shared/Sandbox.hs new file mode 100644 index 0000000..3523edc --- /dev/null +++ b/CabalHelper/Shared/Sandbox.hs @@ -0,0 +1,56 @@ +module CabalHelper.Shared.Sandbox where + +import Control.Applicative +import Data.Char +import Data.Maybe +import Data.List +import Data.Version +import System.FilePath +import System.Directory +import Prelude + +import qualified Data.Traversable as T + +-- | Get the path to the sandbox package-db in a project +getSandboxPkgDb :: FilePath + -- ^ Path to the cabal package root directory (containing the + -- @cabal.sandbox.config@ file) + -> String + -- ^ Cabal build platform, i.e. @buildPlatform@ + -> Version + -- ^ GHC version (@cProjectVersion@ is your friend) + -> IO (Maybe FilePath) +getSandboxPkgDb d platform ghcVer = do + mConf <- T.traverse readFile =<< mightExist (d </> "cabal.sandbox.config") + return $ fixPkgDbVer <$> (extractSandboxDbDir =<< mConf) + + where + fixPkgDbVer dir = + case takeFileName dir == ghcSandboxPkgDbDir platform ghcVer of + True -> dir + False -> takeDirectory dir </> ghcSandboxPkgDbDir platform ghcVer + +ghcSandboxPkgDbDir :: String -> Version -> String +ghcSandboxPkgDbDir platform ghcVer = + platform ++ "-ghc-" ++ showVersion ghcVer ++ "-packages.conf.d" + +-- | Extract the sandbox package db directory from the cabal.sandbox.config +-- file. Exception is thrown if the sandbox config file is broken. +extractSandboxDbDir :: String -> Maybe FilePath +extractSandboxDbDir conf = extractValue <$> parse conf + where + key = "package-db:" + keyLen = length key + + parse = listToMaybe . filter (key `isPrefixOf`) . lines + extractValue = CabalHelper.Shared.Sandbox.dropWhileEnd isSpace . dropWhile isSpace . drop keyLen + + +mightExist :: FilePath -> IO (Maybe FilePath) +mightExist f = do + exists <- doesFileExist f + return $ if exists then (Just f) else (Nothing) + +-- dropWhileEnd is not provided prior to base 4.5.0.0. +dropWhileEnd :: (a -> Bool) -> [a] -> [a] +dropWhileEnd p = foldr (\x xs -> if p x && null xs then [] else x : xs) [] |