nixos-config/lib/env-specific/wrapper-manager.nix

{ pkgs, lib, self }:

rec {
  /* Given a Blender package and its addons to be wrapped, create a derivation
     containing all of the addons properly placed as a system resource folder.
  */
  wrapBlenderAddons = { blenderPackage, addons }:
    let
      blenderVersion = lib.versions.majorMinor blenderPackage.version;
    in
    pkgs.runCommand "blender-system-resources"
      {
        passAsFile = [ "paths" ];
        paths = addons ++ [ blenderPackage ];
        nativeBuildInputs = with pkgs; [ outils ];
      } ''
      mkdir -p $out
      for i in $(cat $pathsPath); do
        resourcesPath="$i/share/blender"
        if [ -d $i/share/blender/${blenderVersion} ]; then
          resourcesPath="$i/share/blender/${blenderVersion}";
        fi
        lndir -silent $resourcesPath $out
      done
    '';

  makeBlenderWrapper = module@{ blenderPackage, blenderArgs ? [ ] , addons ? [ ], ... }:
    let
      blenderAddons = wrapBlenderAddons { inherit blenderPackage addons; };
    in
    lib.mkMerge [
      {
        arg0 = lib.getExe' blenderPackage "blender";
        prependArgs = lib.mkBefore blenderArgs;
      }

      (lib.mkIf (builtins.length addons > 0) {
        env.BLENDER_SYSTEM_RESOURCES.value = blenderAddons;
      })

      (lib.removeAttrs module [ "blenderPackage" "blenderArgs" "addons" ])
    ];
}