module GHC.Utils.CliOption
  ( Option (..)
  , showOpt
  ) where

import GHC.Prelude

-- -----------------------------------------------------------------------------
-- Command-line options

-- | When invoking external tools as part of the compilation pipeline, we
-- pass these a sequence of options on the command-line. Rather than
-- just using a list of Strings, we use a type that allows us to distinguish
-- between filepaths and 'other stuff'. The reason for this is that
-- this type gives us a handle on transforming filenames, and filenames only,
-- to whatever format they're expected to be on a particular platform.
data Option
 = FileOption -- an entry that _contains_ filename(s) / filepaths.
              String  -- a non-filepath prefix that shouldn't be
                      -- transformed (e.g., "/out=")
              String  -- the filepath/filename portion
 | Option     String
 deriving ( Option -> Option -> Bool
(Option -> Option -> Bool)
-> (Option -> Option -> Bool) -> Eq Option
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: Option -> Option -> Bool
$c/= :: Option -> Option -> Bool
== :: Option -> Option -> Bool
$c== :: Option -> Option -> Bool
External instance of the constraint type Eq Char
External instance of the constraint type Eq Char
External instance of the constraint type forall a. Eq a => Eq [a]
External instance of the constraint type forall a. Eq a => Eq [a]
External instance of the constraint type Eq Char
Eq )

showOpt :: Option -> String
showOpt :: Option -> String
showOpt (FileOption String
pre String
f) = String
pre String -> String -> String
forall a. [a] -> [a] -> [a]
++ String
f
showOpt (Option String
s)  = String
s