{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE FlexibleInstances #-}

-- | Names for packages.


module Stack.Types.PackageName
  ( packageNameArgument
  ) where

import           Stack.Prelude
import qualified Options.Applicative as O


-- | An argument which accepts a template name of the format

-- @foo.hsfiles@.

packageNameArgument :: O.Mod O.ArgumentFields PackageName
                    -> O.Parser PackageName
packageNameArgument :: Mod ArgumentFields PackageName -> Parser PackageName
packageNameArgument =
    forall a. ReadM a -> Mod ArgumentFields a -> Parser a
O.argument
        (do String
s <- forall s. IsString s => ReadM s
O.str
            forall a c b. (a -> c) -> (b -> c) -> Either a b -> c
either forall a. String -> ReadM a
O.readerError forall (f :: * -> *) a. Applicative f => a -> f a
pure (String -> Either String PackageName
p String
s))
  where
    p :: String -> Either String PackageName
p String
s =
        case String -> Maybe PackageName
parsePackageName String
s of
            Just PackageName
x -> forall a b. b -> Either a b
Right PackageName
x
            Maybe PackageName
Nothing -> forall a b. a -> Either a b
Left forall a b. (a -> b) -> a -> b
$ [String] -> String
unlines
                [ String
"Expected valid package name, but got: " forall a. [a] -> [a] -> [a]
++ String
s
                , String
"Package names consist of one or more alphanumeric words separated by hyphens."
                , String
"To avoid ambiguity with version numbers, each of these words must contain at least one letter."
                ]