feat: support numlock on

cage.1.scd

@@ -33,6 +33,9 @@ activities outside the scope of the running application are prevented.
 *-s*
 	Allow VT switching
 
+*-n*
+	Enable numlock
+
 *-v*
 	Show the version number and exit.
 

cage.c

@@ -61,6 +61,8 @@
 #include "xwayland.h"
 #endif
 
+extern bool numlock;
+
 void
 server_terminate(struct cg_server *server)
 {
@@ -232,6 +234,7 @@ usage(FILE *file, const char *cage)
 		" -m extend Extend the display across all connected outputs (default)\n"
 		" -m last Use only the last connected output\n"
 		" -s\t Allow VT switching\n"
+		" -n\t Enable numlock\n"
 		" -v\t Show the version number and exit\n"
 		"\n"
 		" Use -- when you want to pass arguments to APPLICATION\n",
@@ -242,7 +245,7 @@ static bool
 parse_args(struct cg_server *server, int argc, char *argv[])
 {
 	int c;
-	while ((c = getopt(argc, argv, "dDhm:sv")) != -1) {
+	while ((c = getopt(argc, argv, "dDhm:snv")) != -1) {
 		switch (c) {
 		case 'd':
 			server->xdg_decoration = true;
@@ -260,6 +263,9 @@ parse_args(struct cg_server *server, int argc, char *argv[])
 				server->output_mode = CAGE_MULTI_OUTPUT_MODE_EXTEND;
 			}
 			break;
+		case 'n':
+			numlock = true;
+			break;
 		case 's':
 			server->allow_vt_switch = true;
 			break;

seat.c

@@ -22,6 +22,7 @@
 #include <wlr/types/wlr_data_device.h>
 #include <wlr/types/wlr_idle_notify_v1.h>
 #include <wlr/types/wlr_keyboard_group.h>
+#include <wlr/interfaces/wlr_keyboard.h>
 #include <wlr/types/wlr_primary_selection.h>
 #include <wlr/types/wlr_relative_pointer_v1.h>
 #include <wlr/types/wlr_scene.h>
@@ -43,6 +44,9 @@
 #include "xwayland.h"
 #endif
 
+static uint32_t locked_mods = 0;
+bool numlock = false;
+
 static void drag_icon_update_position(struct cg_drag_icon *drag_icon);
 
 /* XDG toplevels may have nested surfaces, such as popup windows for context
@@ -358,6 +362,15 @@ cg_keyboard_group_add(struct wlr_keyboard *keyboard, struct cg_seat *seat, bool
 	cg_group->wlr_group->data = cg_group;
 	wlr_keyboard_set_keymap(&cg_group->wlr_group->keyboard, keyboard->keymap);
 
+	if (numlock) {
+		xkb_mod_index_t mod_index = xkb_keymap_mod_get_index(keyboard->keymap, XKB_MOD_NAME_NUM);
+		if (mod_index != XKB_MOD_INVALID)
+			locked_mods |= (uint32_t)1 << mod_index;
+	}
+
+	if (locked_mods)
+		wlr_keyboard_notify_modifiers(&cg_group->wlr_group->keyboard, 0, 0, locked_mods, 0);
+
 	wlr_keyboard_set_repeat_info(&cg_group->wlr_group->keyboard, keyboard->repeat_info.rate,
 				     keyboard->repeat_info.delay);
 
@@ -397,6 +410,7 @@ handle_new_keyboard(struct cg_seat *seat, struct wlr_keyboard *keyboard, bool vi
 	}
 
 	wlr_keyboard_set_keymap(keyboard, keymap);
+	wlr_keyboard_notify_modifiers(keyboard, 0, 0, locked_mods, 0);
 
 	xkb_keymap_unref(keymap);
 	xkb_context_unref(context);