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|
-- cabal-helper: Simple interface to Cabal's configuration state
-- Copyright (C) 2015-2017 Daniel Gröber <cabal-helper@dxld.at>
--
-- SPDX-License-Identifier: Apache-2.0
--
-- Licensed under the Apache License, Version 2.0 (the "License");
-- you may not use this file except in compliance with the License.
-- You may obtain a copy of the License at
--
-- http://www.apache.org/licenses/LICENSE-2.0
{-|
Module : CabalHelper.Shared.Sandbox
Description : Extracting information from @cabal.sandbox.config@ files
License : Apache-2.0
-}
module CabalHelper.Compiletime.Sandbox where
import Control.Applicative
import Data.Char
import Data.Maybe
import Data.List
import System.FilePath
import Prelude
import qualified Data.Traversable as T
import CabalHelper.Shared.Common
import CabalHelper.Compiletime.Program.GHC
( GhcVersion (..), showGhcVersion )
-- | Get the path to the sandbox package-db in a project
getSandboxPkgDb :: String
-- ^ Cabal build platform, i.e. @buildPlatform@
-> GhcVersion
-- ^ GHC version (@cProjectVersion@ is your friend)
-> FilePath
-- ^ Path to the cabal package root directory (containing the
-- @cabal.sandbox.config@ file)
-> IO (Maybe FilePath)
getSandboxPkgDb platform ghcVer projdir = do
mConf <-
T.traverse readFile =<< mightExist (projdir </> "cabal.sandbox.config")
return $ fixPkgDbVer <$> (extractSandboxDbDir =<< mConf)
where
fixPkgDbVer dir =
case takeFileName dir == ghcSandboxPkgDbDir platform ghcVer of
True -> dir
False -> takeDirectory dir </> ghcSandboxPkgDbDir platform ghcVer
ghcSandboxPkgDbDir :: String -> GhcVersion -> String
ghcSandboxPkgDbDir platform ghcVer =
platform ++ "-ghc-" ++ showGhcVersion ghcVer ++ "-packages.conf.d"
-- | Extract the sandbox package db directory from the cabal.sandbox.config
-- file. Exception is thrown if the sandbox config file is broken.
extractSandboxDbDir :: String -> Maybe FilePath
extractSandboxDbDir conf = extractValue <$> parse conf
where
key = "package-db:"
keyLen = length key
parse = listToMaybe . filter (key `isPrefixOf`) . lines
extractValue = CabalHelper.Compiletime.Sandbox.dropWhileEnd isSpace . dropWhile isSpace . drop keyLen
-- 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) []
|
