module Options (
Result(..)
, Run(..)
, parseOptions
#ifdef TEST
, usage
, info
, versionInfo
#endif
) where
import Prelude ()
import Prelude.Compat
import Data.List.Compat
import Data.Maybe
import qualified Paths_doctest
import Data.Version (showVersion)
import Config as GHC
import Interpreter (ghc)
usage :: String
usage = unlines [
"Usage:"
, " doctest [ --no-magic | GHC OPTION | MODULE ]..."
, " doctest --help"
, " doctest --version"
, " doctest --info"
, ""
, "Options:"
, " --help display this help and exit"
, " --version output version information and exit"
, " --info output machine-readable version information and exit"
]
version :: String
version = showVersion Paths_doctest.version
ghcVersion :: String
ghcVersion = GHC.cProjectVersion
versionInfo :: String
versionInfo = unlines [
"doctest version " ++ version
, "using version " ++ ghcVersion ++ " of the GHC API"
, "using " ++ ghc
]
info :: String
info = "[ " ++ (intercalate "\n, " . map show $ [
("version", version)
, ("ghc_version", ghcVersion)
, ("ghc", ghc)
]) ++ "\n]\n"
data Result = Output String | Result Run
deriving (Eq, Show)
type Warning = String
data Run = Run {
runWarnings :: [Warning]
, runOptions :: [String]
, runMagicMode :: Bool
} deriving (Eq, Show)
parseOptions :: [String] -> Result
parseOptions args
| "--help" `elem` args = Output usage
| "--info" `elem` args = Output info
| "--version" `elem` args = Output versionInfo
| otherwise = case stripOptGhc <$> stripNoMagic args of
(magicMode, (warning, xs)) -> Result (Run (maybeToList warning) xs magicMode)
stripNoMagic :: [String] -> (Bool, [String])
stripNoMagic args = (noMagic `notElem` args, filter (/= noMagic) args)
where
noMagic = "--no-magic"
stripOptGhc :: [String] -> (Maybe Warning, [String])
stripOptGhc = go
where
go args = case args of
[] -> (Nothing, [])
"--optghc" : opt : rest -> (Just warning, opt : snd (go rest))
opt : rest -> maybe (fmap (opt :)) (\x (_, xs) -> (Just warning, x : xs)) (stripPrefix "--optghc=" opt) (go rest)
warning = "WARNING: --optghc is deprecated, doctest now accepts arbitrary GHC options\ndirectly."