roc/nix/builder.nix

{ pkgs, lib, rustPlatform, compile-deps, subPackage ? null }:
let
  inherit (compile-deps) zigPkg llvmPkgs llvmVersion llvmMajorMinorStr glibcPath libGccSPath;

  subPackagePath = if subPackage != null then "crates/${subPackage}" else null;
  mainBin = if subPackage == "lang_srv" then "roc_language_server" else "roc";
  filteredSource = pkgs.callPackage ./fileFilter.nix { };
in
rustPlatform.buildRustPackage {
  pname = "roc" + lib.optionalString (subPackage != null) "_${subPackage}";
  version = "0.0.1";

  buildAndTestSubdir = subPackagePath;

  src = filteredSource;

  cargoLock = {
    lockFile = ../Cargo.lock;
    outputHashes = {
      "criterion-0.3.5" = "sha256-+FibPQGiR45g28xCHcM0pMN+C+Q8gO8206Wb5fiTy+k=";
      "inkwell-0.2.0" = "sha256-VhTapYGonoSQ4hnDoLl4AAgj0BppAhPNA+UPuAJSuAU=";
      "plotters-0.3.1" = "sha256-noy/RSjoEPZZbOJTZw1yxGcX5S+2q/7mxnUrzDyxOFw=";
      "rustyline-9.1.1" = "sha256-aqQqz6nSp+Qn44gm3jXmmQUO6/fYTx7iLph2tbA24Bs=";
    };
  };

  shellHook = ''
    export LLVM_SYS_${llvmMajorMinorStr}_PREFIX="${llvmPkgs.llvm.dev}"
  '';

  # required for zig
  XDG_CACHE_HOME =
    "xdg_cache"; # prevents zig AccessDenied error github.com/ziglang/zig/issues/6810
  # want to see backtrace in case of failure
  RUST_BACKTRACE = 1;

  # skip running rust tests, problems:
  # building of example platforms requires network: Could not resolve host
  # zig AccessDenied error github.com/ziglang/zig/issues/6810
  # Once instance has previously been poisoned ??
  doCheck = false;

  nativeBuildInputs = (with pkgs; [
    cmake
    git
    pkg-config
    python3
    llvmPkgs.clang
    llvmPkgs.llvm.dev
    llvmPkgs.bintools-unwrapped # contains lld
    zigPkg
  ]);

  buildInputs = (with pkgs;
    [
      libffi
      libxml2
      ncurses
      zlib
      cargo
      makeWrapper # necessary for postBuild wrapProgram
    ] ++ lib.optionals pkgs.stdenv.isDarwin
      (with pkgs.darwin.apple_sdk.frameworks;
      [
        AppKit
        CoreFoundation
        CoreServices
        Foundation
        Security
      ]));

  # cp: to copy str.zig,list.zig...
  # wrapProgram pkgs.stdenv.cc: to make ld available for compiler/build/src/link.rs
  postInstall =
    let
      binPath =
        lib.makeBinPath [ pkgs.stdenv.cc ];
      linuxArgs = lib.optionalString pkgs.stdenv.isLinux
        "--set NIX_GLIBC_PATH ${glibcPath} --set NIX_LIBGCC_S_PATH ${libGccSPath}";
      rocPath = "$out/bin/roc";
      wrapRoc = "wrapProgram ${rocPath} ${linuxArgs} --prefix PATH : ${binPath}";
    in
    # need to check if roc bin exists since it might not if subPackage is set
    ''
      if test -f ${rocPath}; then
        ${wrapRoc}
      fi
    '';

  # https://ryantm.github.io/nixpkgs/stdenv/meta/
  meta = {
    homepage = "https://www.roc-lang.org/";
    license = lib.licenses.upl;
    mainProgram = mainBin;
  };
}