microhs: init at 0.14.21.0 (#458599)

pkgs/by-name/mi/microhs/package.nix

@@ -0,0 +1,43 @@
+{
+  callPackage,
+  stdenv,
+  fetchFromGitHub,
+  lib,
+  writableTmpDirAsHomeHook,
+  writeTextDir,
+}:
+
+stdenv.mkDerivation (finalAttrs: {
+  pname = "microhs";
+  version = "0.14.21.0";
+
+  src = fetchFromGitHub {
+    owner = "augustss";
+    repo = "MicroHs";
+    tag = "v${finalAttrs.version}";
+    hash = "sha256-Tq8fjI3LCP4NWrmbMP0xyhY2fjRmsMCEvgfDQ/SB5Bo=";
+  };
+
+  # mcabal doesn't seem to respect the make flag and fails with /homeless-shelter
+  # This works around the issue
+  nativeBuildInputs = [ writableTmpDirAsHomeHook ];
+
+  makeFlags = [ "MCABAL=$(out)" ];
+  buildFlags = [ "bootstrap" ];
+
+  # MicroCabal is a separate repository, which should be packaged separately
+  # The MicroCabal that is installed by `make install` is pregenerated, does not respect MCABAL above, and so is not useable
+  postInstall = "rm $out/bin/mcabal";
+
+  passthru.tests = {
+    hello-world = callPackage ./test-hello-world.nix { microhs = finalAttrs.finalPackage; };
+  };
+
+  meta = {
+    description = "Haskell implemented with combinators";
+    homepage = "https://github.com/augustss/MicroHs";
+    license = lib.licenses.asl20;
+    maintainers = [ lib.maintainers.steeleduncan ];
+    platforms = lib.platforms.all;
+  };
+})

pkgs/by-name/mi/microhs/test-hello-world.nix

@@ -0,0 +1,34 @@
+{
+  stdenv,
+  microhs,
+  writeTextDir,
+}:
+
+stdenv.mkDerivation {
+  name = "microhs-hello-world";
+  buildInputs = [ microhs ];
+
+  src = writeTextDir "helloworld.hs" ''
+    main :: IO ()
+    main = putStrLn "Hello World"
+  '';
+
+  buildPhase = ''
+    runHook preBuild
+    mhs helloworld.hs -oExe
+    runHook postBuild
+  '';
+
+  checkPhase = ''
+    runHook preCheck
+    ./Exe | grep "Hello World"
+    runHook postCheck
+  '';
+  doCheck = true;
+
+  installPhase = ''
+    runHook preInstall
+    touch $out
+    runHook postInstall
+  '';
+}