graphics: Introduce amd module

Introduces an AMD graphics specific module. For now this module only
adds amdgpu video drivers to xserver.

Author: britter

modules/nixos/facter.nix

@@ -9,7 +9,7 @@
     ./disk.nix
     ./keyboard.nix
     ./firmware.nix
-    ./graphics.nix
+    ./graphics
     ./networking
     ./system.nix
     ./virtualisation.nix

modules/nixos/graphics/amd.nix

@@ -0,0 +1,14 @@
+{lib, config,...}:
+let
+  cfg = config.facter.detected.graphics.amd;
+in
+{
+  options.facter.detected.graphics = {
+    amd.enable = lib.mkEnableOption "Enable the AMD Graphics module" // {
+      default = builtins.elem "amdgpu" (builtins.map (graphics_card: graphics_card.driver) config.facter.report.hardware.graphics_card);
+    };
+  };
+  config = lib.mkIf cfg.enable {
+  services.xserver.videoDrivers = ["amdgpu"];
+  };
+}

modules/nixos/graphics.nix renamed to modules/nixos/graphics/default.nix

@@ -1,9 +1,12 @@
 { lib, config, ... }:
 let
-  facterLib = import ../../lib/lib.nix lib;
+  facterLib = import ../../../lib/lib.nix lib;
   cfg = config.facter.detected.graphics;
 in
 {
+  imports = [
+    ./amd.nix
+  ];
   options.facter.detected = {
     graphics.enable = lib.mkEnableOption "Enable the Graphics module" // {
       default = builtins.length (config.facter.report.hardware.monitor or [ ]) > 0;