module Options

import Data.String
import System
import System.Console.GetOpt


public export
record Options where
  constructor Opts
  tapVersion : String

defaultOpts = Opts {tapVersion = "13"}

OptMod = Options -> Options

opts : List (OptDescr OptMod)
opts = [
  MkOpt ['V'] ["version"]
    (ReqArg (\v => the OptMod {tapVersion := v}) "VERSION")
    "TAP version to output (13 or 14, default 13)"
]
-- [todo] get rid of "the OptMod" when type inference is better, maybe

makeOpts : List OptMod -> Options
makeOpts = foldl (flip ($)) defaultOpts


getArgs1 : IO (List String)
getArgs1 =
  case !getArgs of
       _ :: args => pure args
       []        => do
         putStrLn "expecting getArgs to start with exe name"
         exitFailure

export
getTestOpts : IO Options
getTestOpts =
  case getOpt Permute opts !getArgs1 of
       MkResult opts [] [] [] => pure $ makeOpts opts
       res => do
         traverse_ putStrLn $ res.errors ++ [usageInfo "quox test suite" opts]
         exitFailure