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authorDaniel Gröber <dxld@darkboxed.org>2015-08-07 09:25:39 +0200
committerDaniel Gröber <dxld@darkboxed.org>2015-08-07 09:25:39 +0200
commit4fd4b1942c7ea33dc8fc7bc6586048c2d8b529c3 (patch)
tree57ba037a2091640cb1a9527ede905e329c317fcc /CabalHelper
parentbdc5f4a740f82f90c5bed277ab368a75040bd6bc (diff)
Factor sandbox stuff out into a seperate module
So we can use the sandbox discovery for Setup.hs components
Diffstat (limited to 'CabalHelper')
-rw-r--r--CabalHelper/Data.hs1
-rw-r--r--CabalHelper/Main.hs1
-rw-r--r--CabalHelper/Sandbox.hs56
3 files changed, 58 insertions, 0 deletions
diff --git a/CabalHelper/Data.hs b/CabalHelper/Data.hs
index 97e9988..6f86ff9 100644
--- a/CabalHelper/Data.hs
+++ b/CabalHelper/Data.hs
@@ -40,5 +40,6 @@ sourceFiles :: [(FilePath, String)]
sourceFiles =
[ ("Main.hs", $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "CabalHelper/Main.hs")))
, ("Common.hs", $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "CabalHelper/Common.hs")))
+ , ("Sandbox.hs", $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "CabalHelper/Sandbox.hs")))
, ("Types.hs", $(LitE . StringL <$> runIO (UTF8.toString <$> BS.readFile "CabalHelper/Types.hs")))
]
diff --git a/CabalHelper/Main.hs b/CabalHelper/Main.hs
index 4c64f42..754f356 100644
--- a/CabalHelper/Main.hs
+++ b/CabalHelper/Main.hs
@@ -79,6 +79,7 @@ import System.IO
import System.IO.Unsafe (unsafeInterleaveIO, unsafePerformIO)
import Text.Printf
+import CabalHelper.Sandbox
import CabalHelper.Common
import CabalHelper.Types
diff --git a/CabalHelper/Sandbox.hs b/CabalHelper/Sandbox.hs
new file mode 100644
index 0000000..f379eeb
--- /dev/null
+++ b/CabalHelper/Sandbox.hs
@@ -0,0 +1,56 @@
+module CabalHelper.Sandbox where
+
+
+import Control.Applicative
+import Data.Char
+import Data.Maybe
+import Data.List
+import Data.Version
+import System.FilePath
+import System.Directory
+
+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.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) []