nix: init

.envrc

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+use flake

.github/workflows/nix.yaml

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+# This workflow tests the Nix build of pulse. We run it only for PRs (not
+# on every push) and we use Github hosted runners.
+
+name: Nix Build
+
+on:
+  pull_request:
+
+jobs:
+  nix-build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: DeterminateSystems/nix-installer-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@main
+    - name: Build
+      run: nix build -L

flake.nix

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+{
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    fstar.url = "github:FStarLang/FStar/v2025.03.25";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { ... }@inputs:
+
+    inputs.flake-parts.lib.mkFlake { inherit inputs; } {
+
+      systems = inputs.nixpkgs.lib.systems.flakeExposed;
+      imports = [ ];
+
+      perSystem = { pkgs, config, system, ... }: {
+
+        packages.pulse = pkgs.stdenv.mkDerivation rec {
+
+          pname = "pulse";
+          version = "9a03472d2c366bde5f7b0497bf3356dd445ce207";
+          src = pkgs.fetchFromGitHub {
+            owner = "FStarLang";
+            repo = pname;
+            rev = "${version}";
+            hash = "sha256-YgWxnX+gCVYx+CCIuprDYKewyEaSekqAilB96eyq+fk=";
+          };
+
+          inherit (pkgs.fstar) nativeBuildInputs;
+          buildInputs = pkgs.fstar.buildInputs ++ [
+            pkgs.fstar
+            pkgs.which
+          ];
+          PATH = "${pkgs.fstar}/bin:$PATH";
+
+          enableParallelBuilding = true;
+
+          installPhase = ''
+            PREFIX=$out make install
+          '';
+
+        };
+
+        packages.pulse-exe = pkgs.writeShellScriptBin "pulse.exe" ''
+          exec ${pkgs.fstar}/bin/fstar.exe "$1" \
+            --include ${config.packages.pulse}/lib/pulse \
+            --include ${config.packages.pulse}/lib/pulse/checker \
+            --include ${config.packages.pulse}/lib/pulse/extraction \
+            --include ${config.packages.pulse}/lib/pulse/lib \
+            --include ${config.packages.pulse}/lib/pulse/ml \
+            --include ${config.packages.pulse}/lib/pulse/syntax_extension \
+            --load_cmxs pulse \
+            "$@"
+        '';
+
+        packages.rustast-bindings = pkgs.rustPlatform.buildRustPackage rec {
+          inherit (config.packages.pulse) version src;
+          inherit (pkgs.fstar) nativeBuildInputs;
+          pname = "rustast-bindings";
+          sourceRoot = "${src.name}/pulse2rust/src/ocaml";
+          cargoLock = {
+            lockFile = ./pulse2rust/src/ocaml/Cargo.lock;
+          };
+          postPatch = ''
+            ln -s ${./pulse2rust/src/ocaml/Cargo.lock} Cargo.lock
+          '';
+        };
+
+        packages.extract = pkgs.stdenv.mkDerivation {
+          inherit (config.packages.pulse) version src;
+          pname = "extract";
+          sourceRoot = "source/pulse2rust/src";
+          buildInputs = [
+            pkgs.fstar
+            pkgs.which
+          ];
+          PATH = "${pkgs.fstar}/bin:$PATH";
+
+          installPhase = ''
+            mkdir -p $out/ocaml/generated
+            cp -r ocaml/generated $out/ocaml
+          '';
+        };
+
+        packages.pulse2rust = pkgs.ocaml-ng.ocamlPackages_4_14.buildDunePackage rec {
+          inherit (config.packages.pulse) version src;
+          pname = "main";
+          sourceRoot = "${src.name}/pulse2rust/src/ocaml";
+
+          nativeBuildInputs = pkgs.fstar.nativeBuildInputs ++ [ pkgs.fstar ];
+          buildInputs = pkgs.fstar.buildInputs ++ [ pkgs.fstar ];
+
+          buildPhase = ''
+            eval $(${pkgs.fstar}/bin/fstar.exe --ocamlenv)
+            mkdir -p $out/bin
+            dune build main.exe --build-dir=$out/bin
+          '';
+
+          postPatch = ''
+            ln -s ${./pulse2rust/src/dune-project} dune-project
+            ln -s ${config.packages.rustast-bindings}/lib/librustast_bindings.a librustast_bindings.a
+            mkdir -p ocaml/generated
+            cp -r ${config.packages.extract}/ocaml/generated ocaml
+          '';
+
+          # overwrites the default dune installPhase
+          installPhase = '''';
+
+          meta.mainProgram = "default/ocaml/main.exe";
+        };
+
+        packages.fstar = pkgs.fstar;
+
+        packages.default = config.packages.pulse;
+
+      };
+    };
+}