Add swaymsg-compatible IPC interface with labmsg client

include/action.h

@@ -29,6 +29,7 @@ bool action_is_valid(struct action *action);
 bool action_is_show_menu(struct action *action);
 
 void action_arg_add_str(struct action *action, const char *key, const char *value);
+void action_arg_add_int(struct action *action, const char *key, int value);
 void action_arg_add_actionlist(struct action *action, const char *key);
 void action_arg_add_querylist(struct action *action, const char *key);
 

include/config/rcxml.h

@@ -73,6 +73,7 @@ struct rcxml {
 	char *config_dir;
 	char *config_file;
 	bool merge_config;
+	char *loaded_config_file;
 
 	/* core */
 	bool xdg_shell_server_side_deco;

include/foreign-toplevel/foreign.h

@@ -9,5 +9,6 @@ struct foreign_toplevel *foreign_toplevel_create(struct view *view);
 void foreign_toplevel_set_parent(struct foreign_toplevel *toplevel,
 	struct foreign_toplevel *parent);
 void foreign_toplevel_destroy(struct foreign_toplevel *toplevel);
+const char *foreign_toplevel_get_identifier(struct foreign_toplevel *toplevel);
 
 #endif /* LABWC_FOREIGN_TOPLEVEL_H */

include/ipc.h

@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef LABWC_IPC_H
+#define LABWC_IPC_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <wayland-util.h>
+
+struct view;
+struct workspace;
+
+/* Wire protocol */
+#define IPC_MAGIC "labwc-ipc"
+#define IPC_MAGIC_LEN 9
+#define IPC_HEADER_SIZE (IPC_MAGIC_LEN + 4 + 4) /* 17 bytes */
+
+/* Message types (same numbering as sway/i3) */
+enum ipc_msg_type {
+	IPC_RUN_COMMAND = 0,
+	IPC_GET_WORKSPACES = 1,
+	IPC_SUBSCRIBE = 2,
+	IPC_GET_OUTPUTS = 3,
+	IPC_GET_TREE = 4,
+	IPC_GET_MARKS = 5,
+	IPC_GET_BAR_CONFIG = 6,
+	IPC_GET_VERSION = 7,
+	IPC_GET_BINDING_MODES = 8,
+	IPC_GET_CONFIG = 9,
+	IPC_SEND_TICK = 10,
+	IPC_SYNC = 11,
+	IPC_GET_BINDING_STATE = 12,
+	IPC_GET_INPUTS = 100,
+	IPC_GET_SEATS = 101,
+};
+
+/* Event types (bit 31 set) */
+#define IPC_EVENT_FLAG 0x80000000
+enum ipc_event_type {
+	IPC_EVENT_WORKSPACE = (IPC_EVENT_FLAG | 0),
+	IPC_EVENT_OUTPUT = (IPC_EVENT_FLAG | 1),
+	IPC_EVENT_WINDOW = (IPC_EVENT_FLAG | 3),
+	IPC_EVENT_SHUTDOWN = (IPC_EVENT_FLAG | 6),
+	IPC_EVENT_TICK = (IPC_EVENT_FLAG | 7),
+};
+
+/* Subscription bitmask */
+#define IPC_SUB_WORKSPACE (1 << 0)
+#define IPC_SUB_OUTPUT (1 << 1)
+#define IPC_SUB_WINDOW (1 << 3)
+#define IPC_SUB_SHUTDOWN (1 << 6)
+#define IPC_SUB_TICK (1 << 7)
+
+struct ipc_client {
+	struct wl_list link; /* server.ipc_clients */
+	int fd;
+	struct wl_event_source *readable;
+	struct wl_event_source *writable;
+	uint32_t subscriptions;
+	/* Write buffer for partial writes */
+	char *write_buf;
+	size_t write_buf_len;
+	size_t write_buf_cap;
+};
+
+/* Server lifecycle */
+void ipc_init(void);
+void ipc_finish(void);
+
+/* Event emitters (called from compositor hooks) */
+void ipc_event_workspace(const char *change, struct workspace *current,
+	struct workspace *old);
+void ipc_event_output(const char *change);
+void ipc_event_window(const char *change, struct view *view);
+void ipc_event_shutdown(void);
+
+#endif /* LABWC_IPC_H */

include/labwc.h

@@ -1,10 +1,10 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 #ifndef LABWC_H
 #define LABWC_H
-#include "config.h"
 #include <wlr/util/box.h>
 #include <wlr/util/log.h>
 #include "common/set.h"
+#include "config.h"
 #include "cycle.h"
 #include "input/cursor.h"
 #include "overlay.h"
@@ -65,9 +65,9 @@ struct seat {
 	struct input_method_relay *input_method_relay;
 
 	/**
-	 * Cursor context saved when a mouse button is pressed on a view/surface.
-	 * It is used to send cursor motion events to a surface even though
-	 * the cursor has left the surface in the meantime.
+	 * Cursor context saved when a mouse button is pressed on a
+	 * view/surface. It is used to send cursor motion events to a surface
+	 * even though the cursor has left the surface in the meantime.
 	 *
 	 * This allows to keep dragging a scrollbar or selecting text even
 	 * when moving outside of the window.
@@ -245,7 +245,8 @@ struct server {
 	 */
 	struct wlr_scene_tree *xdg_popup_tree;
 #if HAVE_XWAYLAND
-	/* Tree for unmanaged xsurfaces without initialized view (usually popups) */
+	/* Tree for unmanaged xsurfaces without initialized view (usually
+	 * popups) */
 	struct wlr_scene_tree *unmanaged_tree;
 #endif
 	struct wlr_scene_tree *cycle_preview_tree;
@@ -254,7 +255,7 @@ struct server {
 
 	/* Workspaces */
 	struct {
-		struct wl_list all;  /* struct workspace.link */
+		struct wl_list all; /* struct workspace.link */
 		struct workspace *current;
 		struct workspace *last;
 		struct wlr_ext_workspace_manager_v1 *ext_manager;
@@ -324,6 +325,8 @@ struct server {
 	pid_t primary_client_pid;
 
 	char *title_fmt;
+
+	struct wl_list ipc_clients;
 };
 
 /* defined in main.c */
@@ -406,7 +409,8 @@ void seat_pointer_end_grab(struct seat *seat, struct wlr_surface *surface);
  */
 void seat_focus_lock_surface(struct seat *seat, struct wlr_surface *surface);
 
-void seat_set_focus_layer(struct seat *seat, struct wlr_layer_surface_v1 *layer);
+void seat_set_focus_layer(struct seat *seat,
+	struct wlr_layer_surface_v1 *layer);
 void seat_output_layout_changed(struct seat *seat);
 
 /*
@@ -457,7 +461,6 @@ void server_start(void);
 void server_finish(void);
 
 void create_constraint(struct wl_listener *listener, void *data);
-void constrain_cursor(struct wlr_pointer_constraint_v1
-	*constraint);
+void constrain_cursor(struct wlr_pointer_constraint_v1 *constraint);
 
 #endif /* LABWC_H */

include/view.h

@@ -242,6 +242,12 @@ struct view {
 	/* Set temporarily when moving view due to layout change */
 	bool adjusting_for_layout_change;
 
+	/*
+	 * Last geometry reported to IPC subscribers. Used to detect
+	 * actual position/size changes and emit move/resize events.
+	 */
+	struct wlr_box ipc_last_geo;
+
 	/* used by xdg-shell views */
 	uint32_t pending_configure_serial;
 	struct wl_event_source *pending_configure_timeout;