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35 lines
1.2 KiB
Haskell
35 lines
1.2 KiB
Haskell
module Stackage.GhcPkg where
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import Stackage.Types
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import System.Process
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import Distribution.Text (simpleParse)
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import Data.Char (isSpace)
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import qualified Data.Set as Set
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import Data.Maybe (fromMaybe)
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import Control.Monad (guard)
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getGlobalPackages :: IO (Set PackageIdentifier)
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getGlobalPackages = do
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-- Account for a change in command line option name
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versionOutput <- readProcess "ghc-pkg" ["--version"] ""
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let arg = fromMaybe "--no-user-package-db" $ do
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verS:_ <- Just $ reverse $ words versionOutput
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v76 <- simpleParse "7.6"
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ver <- simpleParse verS
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guard $ ver < (v76 :: Version)
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return "--no-user-package-conf"
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output <- readProcess "ghc-pkg" [arg, "list"] ""
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fmap Set.unions $ mapM parse $ drop 1 $ lines output
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where
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parse s =
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case clean s of
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"" -> return Set.empty
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s' ->
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case simpleParse s' of
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Just x -> return $ Set.singleton x
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Nothing -> error $ "Could not parse ghc-pkg output: " ++ show s
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clean = stripParens . dropWhile isSpace . reverse . dropWhile isSpace . reverse
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stripParens x@('(':_:_)
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| last x == ')' = tail $ init $ x
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stripParens x = x
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