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module Version.Git (
tGitVersion,
) where
import Language.Haskell.TH
import Language.Haskell.TH.Syntax
import System.Directory
import System.Exit
import System.Process
tGitVersion :: Code Q (Maybe String)
tGitVersion = unsafeCodeCoerce $ do
let git args = do
(ExitSuccess, out, _) <- readCreateProcessWithExitCode
(proc "git" $ [ "--git-dir=./.git", "--work-tree=." ] ++ args) ""
return $ lines out
mbver <- runIO $ do
doesPathExist "./.git" >>= \case
False -> return Nothing
True -> do
desc:_ <- git [ "describe", "--always", "--dirty= (dirty)" ]
files <- git [ "ls-files" ]
return $ Just (desc, files)
case mbver of
Just (_, files) -> mapM_ addDependentFile files
Nothing -> return ()
lift (fst <$> mbver :: Maybe String)
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