Add onMonitorChange hyprland hook script

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

hosts/common/configs/user/gui/astal/default.nix

@@ -39,5 +39,7 @@
         ];
       };
     };
+
+    wayland.windowManager.hyprland.onMonitorChange.services = [ "ags.service" ];
   };
 }

hosts/common/configs/user/gui/hyprland/monitors.sh

@@ -0,0 +1,8 @@
+handle() {
+  # shellcheck disable=SC2086
+  case $1 in
+    monitoradded*|monitorremoved*) systemctl --user restart $SERVICES ;;
+  esac
+}
+
+socat -U - "UNIX-CONNECT:$XDG_RUNTIME_DIR/hypr/$HYPRLAND_INSTANCE_SIGNATURE/.socket2.sock" | while read -r line; do handle "$line"; done

hosts/common/configs/user/gui/hyprland/options.nix

@@ -23,21 +23,45 @@ in
         default = "";
         description = "Extra configuration lines to add to exec";
       };
+
+      onMonitorChange.services = mkOption {
+        type = listOf str;
+        default = [ ];
+        description = "Services to restart when a monitor is connected or disconnected";
+      };
     };
 
   config = {
-    wayland.windowManager.hyprland.settings.exec-once = lib.meta.getExe (
-      pkgs.writeShellApplication {
-        name = "init-hyprland";
-        text = cfg.initExtraConfig;
-      }
-    );
+    wayland.windowManager.hyprland.initExtraConfig =
+      lib.mkIf (cfg.onMonitorChange.services != [ ])
+        "${
+          lib.meta.getExe (
+            pkgs.writeShellApplication {
+              name = "hyprland-monitor-change-services";
+              runtimeInputs = with pkgs; [
+                socat
+                systemd
+              ];
+              runtimeEnv.SERVICES = lib.strings.concatStringsSep " " cfg.onMonitorChange.services;
+              text = builtins.readFile ./monitors.sh;
+            }
+          )
+        } &";
 
-    wayland.windowManager.hyprland.settings.exec = lib.meta.getExe (
-      pkgs.writeShellApplication {
-        name = "reload-hyprland";
-        text = cfg.reloadExtraConfig;
-      }
-    );
+    wayland.windowManager.hyprland.settings = {
+      exec-once = lib.meta.getExe (
+        pkgs.writeShellApplication {
+          name = "init-hyprland";
+          text = cfg.initExtraConfig;
+        }
+      );
+
+      exec = lib.meta.getExe (
+        pkgs.writeShellApplication {
+          name = "reload-hyprland";
+          text = cfg.reloadExtraConfig;
+        }
+      );
+    };
   };
 }

hosts/common/configs/user/gui/swww/default.nix

@@ -64,5 +64,7 @@ in
     };
 
     theme.reloadExtraConfig = "${themeSwww} &";
+
+    wayland.windowManager.hyprland.onMonitorChange.services = [ "swww.service" ];
   };
 }