add retroarch module

configuration.nix

@@ -1,8 +1,9 @@
 ({ modulesPath, config, lib, pkgs, ... }: {
   imports = [
-    ./modules/es-config.nix
+    ./modules
     "${modulesPath}/profiles/qemu-guest.nix"
     ./games.nix
+    ./retroarch
   ];
 
   system.stateVersion = "23.11";

games.nix

@@ -1,9 +1,13 @@
-{pkgs, ...}: {
+{ config, pkgs, ...}:
+let
+  inherit (config.retronix.retroarch) mapRetroarchConfig;
+in
+{
   retronix = {
     systems = {
       "Arcade" = {
         extension = ".sh";
-        games = with pkgs.roms; [
+        games = with pkgs.roms; mapRetroarchConfig {} [
           atetris
           dkong
           mario

modules/default.nix

@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./es-config.nix
+    ./retroarch.nix
+  ];
+}

modules/retroarch.nix

@@ -0,0 +1,32 @@
+{ lib, pkgs, config, ...}:{
+  options = {
+    retronix.retroarch = {
+      settings = lib.mkOption {
+        description = "Global settings for retroarch instances overriden by add RetroarchConfig";
+        type = lib.types.attrsOf lib.types.str;
+      };
+      addRetroarchConfig = lib.mkOption {
+        description = "Function to append retroarch config to a rom";
+        type = lib.types.anything;
+      };
+      mapRetroarchConfig = lib.mkOption {
+        description = "Function to append retroarch config to a list of rom";
+        type = lib.types.anything;
+      };
+    };
+  };
+
+  config = {
+    retronix.retroarch = {
+      addRetroarchConfig =
+        { additionalConfig ? {}, useBaseConfig ? true }: rom:
+        rom.override {
+          settings = if useBaseConfig
+            then config.retronix.retroarch.settings // additionalConfig
+            else additionalConfig;
+        };
+      mapRetroarchConfig =
+        args: builtins.map (config.retronix.retroarch.addRetroarchConfig args);
+    };
+  };
+}

retroarch/default.nix

@@ -0,0 +1,14 @@
+{ config, pkgs, lib, ... }:
+{
+  retronix.retroarch.settings = (import ./settings.nix) // {
+    assets_directory = "${pkgs.retroarch-assets}/share/retroarch/assets";
+    joypad_autoconfig_dir = "${pkgs.retroarch-joypad-autoconfig}/share/libretro/autoconfig";
+    libretro_info_path = "${pkgs.libretro-core-info}/share/retroarch/cores";
+    video_shader_dir = builtins.toString (pkgs.fetchFromGitHub {
+      owner = "RetroPie";
+      repo = "common-shaders";
+      rev = "7ab98be403804fe45c71e616c75716eff471bf9c";
+      hash = "sha256-OHxl1y/UTnkY/UAUaghwWKRktuGWPIOTjd906Ckgv/g=";
+    });
+  };
+}