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34 lines
1.1 KiB
Haskell
34 lines
1.1 KiB
Haskell
{-# LANGUAGE NoImplicitPrelude #-}
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{-# LANGUAGE OverloadedStrings #-}
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module Stackage2.CorePackages
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( getCorePackages
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) where
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import qualified Data.Text as T
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import Stackage2.Prelude
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-- | Get a @Map@ of all of the core packages. Core packages are defined as
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-- packages which ship with GHC itself.
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--
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-- Precondition: GHC global package database has only core packages, and GHC
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-- ships with just a single version of each packages.
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getCorePackages :: IO (Map PackageName Version)
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getCorePackages =
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withCheckedProcess cp $ \ClosedStream src Inherited ->
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src $$ decodeUtf8C =$ linesUnboundedC =$ foldMapMC parsePackage
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where
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cp = proc "ghc-pkg" ["--no-user-package-conf", "list"]
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parsePackage t
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| ":" `isInfixOf` t = return mempty
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| Just p <- stripSuffix "-" p' = singletonMap
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<$> simpleParse p
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<*> simpleParse v
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| otherwise = return mempty
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where
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(p', v) = T.breakOnEnd "-" $ dropParens $ T.strip t
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dropParens s
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| length s > 2 && headEx s == '(' && lastEx s == ')' =
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initEx $ tailEx s
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| otherwise = s
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