i3 draft

common/desktop_environment/i3/default.nix

@@ -0,0 +1,64 @@
+{ config, lib, pkgs, ... }:
+let
+  ccfg = import ../../config.nix;
+  cfg_path = [
+    ccfg.custom_config_key
+    "desktopEnvironment"
+    "i3"
+  ];
+  cfg = lib.attrsets.getAttrFromPath cfg_path config;
+in
+with lib;
+{
+  options = {
+    enable = lib.mkEnableOption "i3 (X11) desktop environment";
+    terminalCommand = mkOption {
+      type = lib.types.str;
+      default = "foot";
+      description = "The terminal command to use.";
+    };
+    extraOptions = mkOption {
+      type = lib.types.attrs;
+      default = { };
+      description = "Extra options for i3 configuration.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    home-manager = {
+      sharedModules = [ ./home_manager ];
+    };
+
+    services.greetd = {
+      enable = true;
+      vt = 2;
+      settings = {
+        default_session = {
+          command = "${pkgs.greetd.tuigreet}/bin/tuigreet --time --remember --remember-session --cmd '${pkgs.dbus}/bin/dbus-run-session ${pkgs.xorg.xinit}/bin/xinit ${pkgs.i3}/bin/i3'}";
+          user = "greeter";
+        };
+      };
+    };
+
+    # X server
+    services.xserver.enable = true;
+    services.xserver.displayManager = {
+      # kept undefined to allow user selection; greetd is enabled above
+    };
+
+    # Environment variables for X11
+    environment.sessionVariables = {
+      XDG_SESSION_TYPE = "x11";
+      XDG_CURRENT_DESKTOP = "i3";
+      XDG_SESSION_DESKTOP = "i3";
+    };
+
+    environment.systemPackages = with pkgs; [ i3 i3status i3lock i3-gaps polybar maim xclip xterm ];
+
+    # Enable backlight/brightness control, audio, etc., similar to sway defaults
+    environment.systemPackages = lib.mkForce (with pkgs; [ polybar maim xclip i3 i3status i3lock i3-gaps pavucontrol btop nemo feh rofi ]);
+
+    # Allow users to add extra options into the generated i3 config
+    # extraOptions can be appended by home-manager fragment
+  };
+}