#!/usr/bin/env cabal
{- cabal:
build-depends:
  base,
  bytestring,
  cereal,
  hspec,
  process,
  shake,
-}
-- initial version taken from https://shakebuild.com/manual
import Development.Shake
import Development.Shake.FilePath
import Development.Shake.Util

cc = "gcc"
flags = "-ggdb"
clearCcCache = removeFilesAfter "build" ["//*"]

main :: IO ()
main = shakeArgs shakeOptions{shakeFiles="_build"} $ do
  want ["_build/interpreter" <.> exe]

  phony "clean" $ do
    putInfo "Cleaning files in _build"
    removeFilesAfter "_build" ["//*"]
    clearCcCache
    removeFilesAfter "newdist" ["//*"]
    cmd_ "cabal" "clean"

  phony "run" $ do
    need ["_build/interpreter" <.> exe]
    putInfo "Running interpreter"
    cmd_ "_build/interpreter" ["program.code"]

  "_build/interpreter" <.> exe %> \out -> do
    cs <- getDirectoryFiles "src" ["//*.c"]
    let os = ["_build" </> "normal" </> "src" </> c -<.> "o" | c <- cs]
    need os
    cmd_ (cc <> " " <> flags <> " -o") [out] os

  "_build/normal//*.o" %> \out -> do
    let c = dropDirectory1 $ dropDirectory1 $ out -<.> "c"
    let m = out -<.> "m"
    cmd_ (cc <> " " <> flags <> " -c") [c] "-o" [out] "-MMD -MF" [m]
    neededMakefileDependencies m