packages/cynthion: Build bitstreams

packages/cynthion/default.nix

@@ -1,4 +1,12 @@
-{ fetchFromGitHub, python3 }:
+{
+  fetchFromGitHub,
+  python3,
+  zsh,
+  stdenv,
+  yosys,
+  nextpnr,
+  trellis,
+}:
 
 let
   pyfwup = python3.pkgs.buildPythonPackage rec {
@@ -174,8 +182,7 @@ let
     rev = version;
     hash = "sha256-eLimS2gghT52tV01ZlFs8xEwwibB4yezl3eW7zrHpW8=";
   };
-in
+  cynthion = python3.pkgs.buildPythonApplication {
-python3.pkgs.buildPythonApplication {
     pname = "cynthion";
     inherit version src;
 
@@ -212,4 +219,39 @@ python3.pkgs.buildPythonApplication {
         tomli
         tqdm
       ]);
-}
+  };
+  cynthion-bitstreams = stdenv.mkDerivation rec {
+    pname = "cynthion-bistreams";
+    inherit version src;
+
+    sourceRoot = "${src.name}/cynthion/python";
+    postPatch = ''
+      substituteInPlace Makefile --replace-fail '/bin/zsh' '${zsh}/bin/zsh'
+      rm -r assets
+      mkdir assets
+    '';
+
+    nativeBuildInputs = [
+      python3
+      cynthion
+      yosys
+      nextpnr
+      trellis
+    ];
+
+    buildPhase = ''
+      make bitstreams
+    '';
+
+    installPhase = ''
+      mv assets $out
+    '';
+  };
+in
+cynthion.overrideAttrs (attrs: {
+  postPatch =
+    attrs.postPatch
+    + ''
+      ln -s ${cynthion-bitstreams}/* assets
+    '';
+})