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28 lines
1.1 KiB
Haskell
28 lines
1.1 KiB
Haskell
module Stackage.CheckCabalVersion
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( checkCabalVersion
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) where
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import Control.Exception (assert)
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import Distribution.Text (simpleParse)
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import Distribution.Version (withinRange)
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import Prelude hiding (pi)
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import System.Process (readProcess)
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checkCabalVersion :: IO String
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checkCabalVersion = do
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putStrLn "Checking Cabal version"
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versionString <- readProcess "cabal" ["--version"] ""
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libVersion <-
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case map words $ lines versionString of
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[_,["using","version",libVersion,"of","the","Cabal","library"]] -> return libVersion
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_ -> error "Did not understand cabal --version output"
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case (simpleParse libVersion, simpleParse ">= 1.16") of
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(Nothing, _) -> error $ "cabal binary reported an invalid Cabal library version: " ++ libVersion
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(_, Nothing) -> assert False $ return ()
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(Just v, Just vr)
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| v `withinRange` vr -> return ()
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| otherwise -> error $ "cabal binary build against unsupported Cabal library version: " ++ libVersion
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return libVersion
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