ipc-rules: Add get-view-pid to get the active view pid

plugins/single_plugins/ipc-rules.cpp

@@ -138,6 +138,7 @@ class ipc_rules_t : public wf::plugin_interface_t, public wf::per_output_tracker
         method_repository->register_method("window-rules/configure-view", configure_view);
         method_repository->register_method("window-rules/focus-view", focus_view);
         method_repository->register_method("window-rules/get-focused-view", get_focused_view);
+        method_repository->register_method("window-rules/get-view-pid", get_view_pid);
         method_repository->connect(&on_client_disconnected);
         wf::get_core().connect(&on_view_mapped);
         wf::get_core().connect(&on_kbfocus_changed);
@@ -156,6 +157,7 @@ class ipc_rules_t : public wf::plugin_interface_t, public wf::per_output_tracker
         method_repository->unregister_method("window-rules/configure-view");
         method_repository->unregister_method("window-rules/focus-view");
         method_repository->unregister_method("window-rules/get-focused-view");
+        method_repository->unregister_method("window-rules/get-view-pid");
         fini_output_tracking();
     }
 
@@ -494,6 +496,35 @@ class ipc_rules_t : public wf::plugin_interface_t, public wf::per_output_tracker
 
         return wf::ipc::json_error("Unknown input device!");
     };
+
+    wf::ipc::method_callback get_view_pid = [=] (nlohmann::json)
+    {
+        auto response = wf::ipc::json_ok();
+        auto view     = wf::get_core().seat->get_active_view();
+        pid_t pid     = -1;
+        if (!view)
+        {
+            response["pid"] = pid;
+            return response;
+        }
+
+        wlr_surface *wlr_surface = view->get_wlr_surface();
+        int is_xwayland_surface  = 0;
+#if WF_HAS_XWAYLAND
+        is_xwayland_surface = wlr_surface && wlr_xwayland_surface_try_from_wlr_surface(wlr_surface);
+        if (is_xwayland_surface)
+        {
+            pid = wlr_xwayland_surface_try_from_wlr_surface(wlr_surface)->pid;
+        } else
+#endif
+        if (view && view->get_client())
+        {
+            wl_client_get_credentials(view->get_client(), &pid, 0, 0);
+        }
+
+        response["pid"] = pid;
+        return response;
+    };
 };
 
 DECLARE_WAYFIRE_PLUGIN(ipc_rules_t);