From 3c2800b7d4a03dda4557275d1680d6acb25888b3 Mon Sep 17 00:00:00 2001
From: Stefan Ellmauthaler <stefan.ellmauthaler@tu-dresden.de>
Date: Mon, 14 Aug 2023 15:29:26 +0200
Subject: [PATCH] Add background image service (based on feh calls)

---
 users/ellmau/autorandr.nix    |  1 +
 users/ellmau/background-x.nix | 34 ++++++++++++++++++++++++++++++++++
 users/ellmau/default.nix      |  1 +
 3 files changed, 36 insertions(+)
 create mode 100644 users/ellmau/background-x.nix

diff --git a/users/ellmau/autorandr.nix b/users/ellmau/autorandr.nix
index efe7957..1ce3c29 100644
--- a/users/ellmau/autorandr.nix
+++ b/users/ellmau/autorandr.nix
@@ -126,6 +126,7 @@ with lib; {
         };
         hooks.postswitch = {
           "polybar" = "systemctl --user restart polybar.service";
+          change-bg = "/home/ellmau/.fehbg";
         };
       };
     };
diff --git a/users/ellmau/background-x.nix b/users/ellmau/background-x.nix
new file mode 100644
index 0000000..a0cf970
--- /dev/null
+++ b/users/ellmau/background-x.nix
@@ -0,0 +1,34 @@
+{
+  config,
+  pkgs,
+  lib,
+  nixosConfig,
+  ...
+}:
+with lib; {
+  config = let
+    cfg = nixosConfig.elss.graphical.xserver;
+    fehArgs = "--bg-fill --no-fehbg";
+  in
+    mkIf cfg.enable {
+      systemd.user = {
+        services = {
+          desktop-background = {
+            Unit = {
+              Description = "Set desktop background";
+              Documentation = ["man:feh(1)"];
+              After = ["graphical-session-pre.target"];
+              ParOf = ["graphical-session.target"];
+            };
+
+            Service = {
+              type = "oneshot";
+              ExecStart = "${pkgs.feh}/bin/feh ${fehArgs} ${config.xdg.configHome}/background.png";
+            };
+
+            Install = {WantedBy = ["graphical-session.target"];};
+          };
+        };
+      };
+    };
+}
diff --git a/users/ellmau/default.nix b/users/ellmau/default.nix
index 59a327b..8f3349b 100644
--- a/users/ellmau/default.nix
+++ b/users/ellmau/default.nix
@@ -24,6 +24,7 @@
     ./waybar.nix
 
     ./graphical.nix
+    ./background-x.nix
   ];
   services = {
     gnome-keyring = {