add mangohud configuration

flake.nix

@@ -149,6 +149,7 @@
                   imports = [
                     ./home-manager/browser.nix
                     ./home-manager/gauntlet.nix
+                    ./home-manager/mangohud.nix
                     ./home-manager/plasma.nix
                     ./home-manager/tpm.nix
                     ./home-manager/user.nix

home-manager/mangohud.nix

@@ -0,0 +1,38 @@
+{ pkgs, ... }:
+let
+  customfonts = pkgs.callPackage ../packages/customfonts.nix { inherit pkgs; };
+in
+{
+  programs.mangohud = {
+    enable = true;
+    enableSessionWide = true;
+    settings = {
+      # see https://github.com/flightlessmango/MangoHud/blob/master/data/MangoHud.conf for default config and configuration options
+      # General
+      cpu_stats = true; # On by default
+      cpu_temp = true;
+      gpu_stats = true; # On by default
+      gpu_temp = true;
+      fps = true; # On by default
+      frametime = true; # On by default
+      throttling_status = true; # On by default
+      ram = true;
+      vram = true;
+
+      # Misc
+      fps_limit = 144;
+      show_fps_limit = true;
+      font_file = "${customfonts}/share/fonts/opentype/ComicCode Nerd Font.otf";
+
+      # Keybindings
+      toggle_hud = "Shift_R+F12";
+      toggle_hud_position = "Shift_R+F11";
+      toggle_preset = "Shift_R+F10";
+      toggle_fps_limit = "Shift_L+F1";
+      toggle_logging = "Shift_L+F2";
+      reload_cfg = "Shift_L+F4";
+      upload_log = "Shift_L+F3";
+      reset_fps_metrics = "Shift_R+f9";
+    };
+  };
+}

nixos/gaming.nix

@@ -7,7 +7,6 @@
   };
   environment.systemPackages = with pkgs; [
     gamemode
-    mangohud
     (prismlauncher.override {
       jdks = with pkgs; [
         jdk8