Reload config+theme on SIGHUP

src/action.c

@@ -1,8 +1,14 @@
+#include <strings.h>
+
 #include "labwc.h"
 #include "common/spawn.h"
 #include "common/log.h"
 
-#include <strings.h>
+static void reconfigure(void)
+{
+	char *const args[] = { "killall", "-SIGHUP", "labwc", NULL };
+	execvp(args[0], args);
+}
 
 void action(struct server *server, const char *action, const char *command)
 {
@@ -10,11 +16,13 @@ void action(struct server *server, const char *action, const char *command)
 		return;
 	if (!strcasecmp(action, "Exit")) {
 		wl_display_terminate(server->wl_display);
+	} else if (!strcasecmp(action, "Execute")) {
+		spawn_async_no_shell(command);
 	} else if (!strcasecmp(action, "NextWindow")) {
 		server->cycle_view =
 			desktop_next_view(server, server->cycle_view);
-	} else if (!strcasecmp(action, "Execute")) {
-		spawn_async_no_shell(command);
+	} else if (!strcasecmp(action, "Reconfigure")) {
+		reconfigure();
 	} else if (!strcasecmp(action, "debug-views")) {
 		dbg_show_views(server);
 	} else {

src/common/dir.c

@@ -122,8 +122,6 @@ char *config_dir(void)
 char *theme_dir(const char *theme_name)
 {
 	static char buf[4096] = { 0 };
-	if (buf[0] != '\0')
-		return buf;
 	struct ctx ctx = { .build_path_fn = build_theme_path,
 			   .buf = buf,
 			   .len = sizeof(buf),

src/config/rcxml.c

@@ -214,9 +214,22 @@ void rcxml_parse_xml(struct buf *b)
 	xmlCleanupParser();
 }
 
+static void pre_processing(void)
+{
+	rc.xdg_shell_server_side_deco = true;
+	rc.font_size_activewindow = 8;
+}
+
 static void rcxml_init()
 {
+	static bool has_run;
+
+	if (has_run)
+		return;
+	has_run = true;
 	LIBXML_TEST_VERSION
+	wl_list_init(&rc.keybinds);
+	pre_processing();
 }
 
 static void bind(const char *binding, const char *action, const char *command)
@@ -240,12 +253,6 @@ static void set_title_height(void)
 	rc.title_height = font_height(buf);
 }
 
-static void pre_processing(void)
-{
-	rc.xdg_shell_server_side_deco = true;
-	rc.font_size_activewindow = 8;
-}
-
 static void post_processing(void)
 {
 	if (!wl_list_length(&rc.keybinds)) {
@@ -271,30 +278,38 @@ static void rcxml_path(char *buf, size_t len)
 	snprintf(buf, len, "%s/rc.xml", config_dir());
 }
 
+static void find_config_file(char *buffer, size_t len, const char *filename)
+{
+	if (filename) {
+		snprintf(buffer, len, "%s", filename);
+		return;
+	}
+	rcxml_path(buffer, len);
+}
+
 void rcxml_read(const char *filename)
 {
 	FILE *stream;
 	char *line = NULL;
 	size_t len = 0;
 	struct buf b;
-	char rcxml[4096] = { 0 };
+	static char rcxml[4096] = { 0 };
 
 	rcxml_init();
-	wl_list_init(&rc.keybinds);
-	pre_processing();
 
 	/*
-	 * Reading file into buffer before parsing makes it easier to write
-	 * unit tests.
+	 * rcxml_read() can be called multiple times, but we only set rcxml[]
+	 * the first time. The specified 'filename' is only respected the first
+	 * time.
 	 */
-	if (filename)
-		snprintf(rcxml, sizeof(rcxml), "%s", filename);
-	else
-		rcxml_path(rcxml, sizeof(rcxml));
+	if (rcxml[0] == '\0')
+		find_config_file(rcxml, sizeof(rcxml), filename);
 	if (rcxml[0] == '\0') {
 		warn("cannot find rc.xml config file");
 		goto no_config;
 	}
+
+	/* Reading file into buffer before parsing - better for unit tests */
 	stream = fopen(rcxml, "r");
 	if (!stream) {
 		warn("cannot read (%s)", rcxml);

src/keyboard.c

@@ -30,7 +30,8 @@ static bool handle_keybinding(struct server *server, uint32_t modifiers,
 			continue;
 		for (size_t i = 0; i < keybind->keysyms_len; i++) {
 			if (sym == keybind->keysyms[i]) {
-				action(server, keybind->action, keybind->command);
+				action(server, keybind->action,
+				       keybind->command);
 				return true;
 			}
 		}

src/main.c

@@ -23,17 +23,18 @@ int main(int argc, char *argv[])
 {
 	char *startup_cmd = NULL;
 	char *config_file = NULL;
-	wlr_log_init(WLR_ERROR, NULL);
 
 	int c;
-	while ((c = getopt(argc, argv, "s:c:h")) != -1) {
+	while ((c = getopt(argc, argv, "c:s:h")) != -1) {
 		switch (c) {
-		case 's':
-			startup_cmd = optarg;
-			break;
 		case 'c':
 			config_file = optarg;
 			break;
+		case 's':
+			startup_cmd = optarg;
+			break;
+		case 'h':
+			/* fallthrough */
 		default:
 			usage();
 		}
@@ -41,6 +42,7 @@ int main(int argc, char *argv[])
 	if (optind < argc)
 		usage();
 
+	wlr_log_init(WLR_ERROR, NULL);
 	rcxml_read(config_file);
 
 	/* Wayland requires XDG_RUNTIME_DIR to be set */

src/server.c

@@ -1,5 +1,8 @@
 #include "labwc.h"
+#include "theme/theme.h"
+#include "config/rcxml.h"
 
+#include <signal.h>
 #include <wlr/types/wlr_export_dmabuf_v1.h>
 #include <wlr/types/wlr_screencopy_v1.h>
 #include <wlr/types/wlr_data_control_v1.h>
@@ -9,6 +12,7 @@
 
 static struct wlr_backend *backend;
 static struct wlr_compositor *compositor;
+static struct wl_event_source *sighup_source;
 
 static void server_new_input(struct wl_listener *listener, void *data)
 {
@@ -72,6 +76,25 @@ static void seat_request_set_selection(struct wl_listener *listener, void *data)
 	wlr_seat_set_selection(server->seat, event->source, event->serial);
 }
 
+static void reload_config_and_theme(void)
+{
+	rcxml_finish();
+	/* TODO: use rc.config_path */
+	rcxml_read(NULL);
+	theme_read(rc.theme_name);
+}
+
+static int handle_signal(int signal, void *data)
+{
+	switch (signal) {
+	case SIGHUP:
+		reload_config_and_theme();
+		return 0;
+	default:
+		return 0;
+	}
+}
+
 void server_init(struct server *server)
 {
 	server->wl_display = wl_display_create();
@@ -80,6 +103,12 @@ void server_init(struct server *server)
 		exit(EXIT_FAILURE);
 	}
 
+	/* Catch SIGHUP */
+	struct wl_event_loop *event_loop = NULL;
+	event_loop = wl_display_get_event_loop(server->wl_display);
+	sighup_source = wl_event_loop_add_signal(
+		event_loop, SIGHUP, handle_signal, &server->wl_display);
+
 	/*
 	 * The backend is a wlroots feature which abstracts the underlying
 	 * input and output hardware. the autocreate option will choose the
@@ -312,6 +341,7 @@ void server_finish(struct server *server)
 	wlr_output_layout_destroy(server->output_layout);
 	wlr_xwayland_destroy(server->xwayland);
 	wlr_xcursor_manager_destroy(server->cursor_mgr);
+	wl_event_source_remove(sighup_source);
 	wl_display_destroy_clients(server->wl_display);
 	wl_display_destroy(server->wl_display);
 }