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Fix cabalSet for pre-release versions

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Julian Ospald 2020-07-28 21:44:25 +02:00
parent af811f3dbc
commit 86b0e4b31b
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1 changed files with 27 additions and 12 deletions
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39
lib/GHCup/Utils.hs
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@ -259,18 +259,33 @@ cabalInstalled ver = do
cabalSet :: (MonadIO m, MonadThrow m) => m (Maybe Version)
cabalSet = do
cabalbin <- (</> [rel|cabal|]) <$> liftIO ghcupBinDir
mc <- liftIO $ handleIO (\_ -> pure Nothing) $ fmap Just $ executeOut
cabalbin
["--numeric-version"]
Nothing
fmap join $ forM mc $ \c -> if
| not (B.null (_stdOut c))
, _exitCode c == ExitSuccess -> do
let reportedVer = fst . B.spanEnd (== _lf) . _stdOut $ c
case version $ decUTF8Safe reportedVer of
Left e -> throwM e
Right r -> pure $ Just r
| otherwise -> pure Nothing
b <- fmap (== SymbolicLink) $ liftIO $ getFileType cabalbin
if
| b -> do
liftIO $ handleIO' NoSuchThing (\_ -> pure $ Nothing) $ do
link <- readSymbolicLink $ toFilePath cabalbin
Just <$> linkVersion link
| otherwise -> do -- legacy behavior
mc <- liftIO $ handleIO (\_ -> pure Nothing) $ fmap Just $ executeOut
cabalbin
["--numeric-version"]
Nothing
fmap join $ forM mc $ \c -> if
| not (B.null (_stdOut c)), _exitCode c == ExitSuccess -> do
let reportedVer = fst . B.spanEnd (== _lf) . _stdOut $ c
case version $ decUTF8Safe reportedVer of
Left e -> throwM e
Right r -> pure $ Just r
| otherwise -> pure Nothing
where
linkVersion :: MonadThrow m => ByteString -> m Version
linkVersion bs = do
t <- throwEither $ E.decodeUtf8' bs
throwEither $ MP.parse parser "" t
where
parser =
MP.chunk "cabal-" *> version'