Add default.nix and shell.nix

default.nix

@@ -0,0 +1,48 @@
+{
+  pkgs ? (import ./pkgs.nix { }),
+}:
+
+pkgs.callPackage (
+  {
+    stdenv,
+    bluespec,
+    nextpnr,
+    openfpgaloader,
+    trellis,
+    which,
+    yosys,
+  }:
+  stdenv.mkDerivation {
+    pname = "bluespec-joh-template";
+    version = "0.1.0";
+    src = ./.;
+
+    # Versions can be checked with
+    # `nix eval --json ".#bluespec-joh-template.nativeBuildInputs" | nix-shell -p jq --run jq`
+    nativeBuildInputs = [
+      bluespec
+      nextpnr
+      openfpgaloader
+      trellis
+      which
+      yosys
+    ];
+
+    makeFlags = [
+      "-C"
+      "ulx3s_fpga"
+      "mkTop.bit"
+    ];
+
+    installPhase = ''
+      runHook preInstall
+
+      mkdir -p $out
+      cp ./ulx3s_fpga/mkTop.bit $out/
+
+      runHook postInstall
+    '';
+
+    passthru = { inherit pkgs; };
+  }
+) { }

pkgs.nix

@@ -0,0 +1,9 @@
+let
+  date = "2025-02-02";
+  rev = "3a228057f5b619feb3186e986dbe76278d707b6e";
+  sha256 = "0iqla32cwy147lx1jw84174qkf8jyd912vxqjfgggyil1k8fix66";
+in
+builtins.trace "(Using pinned Nixpkgs at ${rev} from ${date} nixos-unstable)" import (fetchTarball {
+  url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
+  inherit sha256;
+})

shell.nix

@@ -0,0 +1,8 @@
+let
+  bluespec-joh-template = import ./default.nix { };
+  pkgs = bluespec-joh-template.pkgs;
+in
+
+pkgs.mkShell {
+  inputsFrom = [ bluespec-joh-template ];
+}