Implement modes

include/sway/ipc-server.h

@@ -13,5 +13,6 @@ struct sockaddr_un *ipc_user_sockaddr(void);
 void ipc_event_workspace(swayc_t *old, swayc_t *new, const char *change);
 void ipc_event_window(swayc_t *window, const char *change);
 void ipc_event_barconfig_update(struct bar_config *bar);
+void ipc_event_mode(const char *mode);
 
 #endif

sway/commands.c

@@ -100,6 +100,7 @@ static struct cmd_handler handlers[] = {
 	{ "exec_always", cmd_exec_always },
 	{ "include", cmd_include },
 	{ "input", cmd_input },
+	{ "mode", cmd_mode },
 	{ "output", cmd_output },
 	{ "seat", cmd_seat },
 	{ "workspace", cmd_workspace },

sway/commands/mode.c

@@ -0,0 +1,59 @@
+#define _XOPEN_SOURCE 500
+#include <stdbool.h>
+#include <string.h>
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/ipc-server.h"
+#include "list.h"
+#include "log.h"
+
+struct cmd_results *cmd_mode(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "mode", EXPECTED_AT_LEAST, 1))) {
+		return error;
+	}
+
+	const char *mode_name = argv[0];
+	bool new_mode = (argc == 2 && strcmp(argv[1], "{") == 0);
+	if (new_mode && !config->reading) {
+		return cmd_results_new(CMD_FAILURE,
+				"mode", "Can only be used in config file.");
+	}
+	struct sway_mode *mode = NULL;
+	// Find mode
+	for (int i = 0; i < config->modes->length; ++i) {
+		struct sway_mode *test = config->modes->items[i];
+		if (strcasecmp(test->name, mode_name) == 0) {
+			mode = test;
+			break;
+		}
+	}
+	// Create mode if it doesn't exist
+	if (!mode && new_mode) {
+		mode = calloc(1, sizeof(struct sway_mode));
+		if (!mode) {
+			return cmd_results_new(CMD_FAILURE,
+					"mode", "Unable to allocate mode");
+		}
+		mode->name = strdup(mode_name);
+		mode->keysym_bindings = create_list();
+		mode->keycode_bindings = create_list();
+		list_add(config->modes, mode);
+	}
+	if (!mode) {
+		error = cmd_results_new(CMD_INVALID,
+				"mode", "Unknown mode `%s'", mode_name);
+		return error;
+	}
+	if ((config->reading && new_mode) || (!config->reading && !new_mode)) {
+		wlr_log(L_DEBUG, "Switching to mode `%s'",mode->name);
+	}
+	// Set current mode
+	config->current_mode = mode;
+	if (!new_mode) {
+		// trigger IPC mode event
+		ipc_event_mode(config->current_mode->name);
+	}
+	return cmd_results_new(new_mode ? CMD_BLOCK_MODE : CMD_SUCCESS, NULL, NULL);
+}

sway/ipc-server.c

@@ -290,7 +290,7 @@ void ipc_event_window(swayc_t *window, const char *change) {
 
 	const char *json_string = json_object_to_json_string(obj);
 	ipc_send_event(json_string, IPC_EVENT_WINDOW);
-	json_object_put(obj); // free
+	json_object_put(obj);
 }
 
 void ipc_event_barconfig_update(struct bar_config *bar) {
@@ -299,7 +299,17 @@ void ipc_event_barconfig_update(struct bar_config *bar) {
 
 	const char *json_string = json_object_to_json_string(json);
 	ipc_send_event(json_string, IPC_EVENT_BARCONFIG_UPDATE);
-	json_object_put(json); // free
+	json_object_put(json);
+}
+
+void ipc_event_mode(const char *mode) {
+	wlr_log(L_DEBUG, "Sending mode::%s event", mode);
+	json_object *obj = json_object_new_object();
+	json_object_object_add(obj, "change", json_object_new_string(mode));
+
+	const char *json_string = json_object_to_json_string(obj);
+	ipc_send_event(json_string, IPC_EVENT_MODE);
+	json_object_put(obj);
 }
 
 int ipc_client_handle_writable(int client_fd, uint32_t mask, void *data) {

sway/meson.build

@@ -16,6 +16,7 @@ sway_sources = files(
 	'commands/include.c',
 	'commands/input.c',
 	'commands/layout.c',
+	'commands/mode.c',
 	'commands/seat.c',
 	'commands/seat/attach.c',
 	'commands/seat/fallback.c',