opentxl: use generated code as src instead of repo (#501157)

  lib,

  stdenv,

  callPackage,

  fetchFromGitHub,

  fetchurl,

  nix-update-script,

  turingplus,

}:

stdenv.mkDerivation (finalAttrs: {

  pname = "opentxl";

  version = "11.3.7";

  src = fetchFromGitHub {

    owner = "CordyJ";

    repo = "OpenTxl";

    tag = "v${finalAttrs.version}";

    hash = "sha256-Gh0OEZ5pGhbxDIKYuBLdzUV7Ezn+7elm146ccpJ5bn8=";

  # The code generation part of the upstream build system relies on an x86-only binary,

  # so the generated code is fetched from the GitHub release instead

  src = fetchurl {

    url = "https://github.com/CordyJ/OpenTxl/releases/download/v${finalAttrs.version}/OpenTxl-${finalAttrs.version}-csrc.tar.gz";

    hash = "sha256-qIvxQqo1yCVJImjUvNNinzhoywVgaq9s0E+Ab+QStc0=";

  };

  nativeBuildInputs = [ turingplus ];

  # Using -std=gnu89 to prevent errors that occur with default args

  env.NIX_CFLAGS_COMPILE = "-std=gnu89 -Wno-int-conversion";

  postPatch = ''

    # Replace hardcoded /bin/rm in various files

    find . -type f -exec sed -i 's#/bin/rm#rm#g' {} +

    # Replace hardcoded FHS paths in various files

    find . -type f -exec sed -i \

      -e 's#/bin/mv#mv#g' \

      -e 's#/bin/rm#rm#g' \

      -e "s#/usr/local/bin#$out/bin#g" \

      -e "s#/usr/local/lib/txl#$out/lib#g" \

      {} +

    # Replace hardcoded gcc references

    substituteInPlace src/scripts/c/unix/{txlc,txl2c} \

    substituteInPlace scripts/unix/{txlc,txl2c} \

      --replace-fail gcc '${stdenv.cc}/bin/cc'

    # Replace hardcoded FHS paths

    substituteInPlace src/scripts/c/unix/* src/scripts/t/* \

      --replace-fail '/usr/local/bin' "$out/bin" \

      --replace-fail '/usr/local/lib/txl' "$out/lib"

  '';

  # Generate source files and enter directory

  preBuild = ''

    make csrc

    cd csrc

    makeFlagsArray+=(

      CC="$CC"

      LD="$CC"

  meta = {

    description = "Open-source compiler for the Txl language";

    mainProgram = "txl";

    platforms = [

      "x86_64-linux"

      "x86_64-darwin"

    ];

    platforms = lib.platforms.unix;

    homepage = "https://github.com/CordyJ/OpenTxl";

    downloadPage = "https://github.com/CordyJ/OpenTxl/releases";

    changelog = "https://github.com/CordyJ/OpenTxl/releases/tag/v${finalAttrs.version}";