module Main where

import Control.Applicative ((<$>))
import Data.List (stripPrefix, isInfixOf)
import Data.Maybe (mapMaybe)

import Text.Printf (printf)


srcfiles :: [String]
template, testModule, tok, testPrefix :: String

srcfiles   =
   map ("src/System/Path/" ++) $
   ["Internal.hs", "Directory.hs", "IO.hs"]
template   = "test/TestTemplate.hs"
testModule = "test/TestResult.hs"
tok        = "<TESTS_GO_HERE>"
testPrefix = "-- >> "

main :: IO ()
main = do
  testLines <-
     mapMaybe (stripPrefix testPrefix) . concatMap lines <$> mapM readFile srcfiles
  (templateHead,_:templateTail) <-
     break (tok `isInfixOf`) . lines <$> readFile template
  let outLines = (\t -> printf "  (%s,\n    %s) :" (show t) t) <$> testLines

  writeFile testModule $ unlines $
     ("{- Do not edit! Created from " ++ template ++ " -}") :
     templateHead ++ outLines ++ templateTail