From ed9998cf2a5ebb181ee604d2f0a2b0c64718c082 Mon Sep 17 00:00:00 2001
From: colin <colin@uninsane.org>
Date: Wed, 2 Nov 2022 03:31:52 -0700
Subject: [PATCH] nixos/lightdm: add `greeters.mobile` config option

i based this on the neighboring lightdm-greeters/mini.nix module.

lightdm-mobile-greeter doesn't have a lot of configuration options.
it grabs the default user to login as from lightdm, along with which DE
it should launch. so no further configuration should be needed aside
from enabling `services.xserver.displayManager.lightdm.enable` and
either setting `services.xserver.displayManager.defaultSession` to the
appropriate session or explicitly defining a seat like:

```nix
services.xserver.displayManager.lightdm.extraSeatDefaults = ''
  user-session = phosh
'';
```
---
 .../lightdm-greeters/mobile.nix               | 26 +++++++++++++++++++
 .../services/x11/display-managers/lightdm.nix |  1 +
 2 files changed, 27 insertions(+)
 create mode 100644 nixos/modules/services/x11/display-managers/lightdm-greeters/mobile.nix

diff --git a/nixos/modules/services/x11/display-managers/lightdm-greeters/mobile.nix b/nixos/modules/services/x11/display-managers/lightdm-greeters/mobile.nix
new file mode 100644
index 000000000000..31cc9b3deaa1
--- /dev/null
+++ b/nixos/modules/services/x11/display-managers/lightdm-greeters/mobile.nix
@@ -0,0 +1,26 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  dmcfg = config.services.xserver.displayManager;
+  ldmcfg = dmcfg.lightdm;
+  cfg = ldmcfg.greeters.mobile;
+in
+{
+  options = {
+    services.xserver.displayManager.lightdm.greeters.mobile = {
+      enable = mkEnableOption (lib.mdDoc
+        "lightdm-mobile-greeter as the lightdm greeter"
+      );
+    };
+  };
+
+  config = mkIf (ldmcfg.enable && cfg.enable) {
+    services.xserver.displayManager.lightdm.greeters.gtk.enable = false;
+
+    services.xserver.displayManager.lightdm.greeter = mkDefault {
+      package = pkgs.lightdm-mobile-greeter.xgreeters;
+      name = "lightdm-mobile-greeter";
+    };
+  };
+}
diff --git a/nixos/modules/services/x11/display-managers/lightdm.nix b/nixos/modules/services/x11/display-managers/lightdm.nix
index b0508c3b4f79..f74e8efb8f64 100644
--- a/nixos/modules/services/x11/display-managers/lightdm.nix
+++ b/nixos/modules/services/x11/display-managers/lightdm.nix
@@ -83,6 +83,7 @@ in
     ./lightdm-greeters/pantheon.nix
     ./lightdm-greeters/tiny.nix
     ./lightdm-greeters/slick.nix
+    ./lightdm-greeters/mobile.nix
     (mkRenamedOptionModule [ "services" "xserver" "displayManager" "lightdm" "autoLogin" "enable" ] [
       "services"
       "xserver"