Merge pull request #492 from mikkeloscar/swaybar-multi-output

Display single swaybar on multiple outputs

include/bar/bar.h

@@ -8,8 +8,7 @@
 struct bar {
 	struct config *config;
 	struct status_line *status;
-	struct output *output;
+	list_t *outputs;
-	/* list_t *outputs; */
 
 	int ipc_event_socketfd;
 	int ipc_socketfd;
@@ -22,6 +21,7 @@ struct output {
 	struct registry *registry;
 	list_t *workspaces;
 	char *name;
+	int idx;
 };
 
 struct workspace {
@@ -35,7 +35,12 @@ struct workspace {
 /**
  * Setup bar.
  */
-void bar_setup(struct bar *bar, const char *socket_path, const char *bar_id, int desired_output);
+void bar_setup(struct bar *bar, const char *socket_path, const char *bar_id);
+
+/**
+ * Create new output struct from name.
+ */
+struct output *new_output(const char *name);
 
 /**
  * Bar mainloop.

include/bar/config.h

@@ -4,6 +4,8 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+#include "list.h"
+
 /**
  * Colors for a box with background, border and text colors.
  */
@@ -25,6 +27,8 @@ struct config {
 	bool strip_workspace_numbers;
 	bool binding_mode_indicator;
 	bool workspace_buttons;
+	bool all_outputs;
+	list_t *outputs;
 
 	int height;
 

include/bar/ipc.h

@@ -6,7 +6,7 @@
 /**
  * Initialize ipc connection to sway and get sway state, outputs, bar_config.
  */
-void ipc_bar_init(struct bar *bar, int outputi, const char *bar_id);
+void ipc_bar_init(struct bar *bar, const char *bar_id);
 
 /**
  * Handle ipc event from sway.

include/config.h

@@ -125,6 +125,7 @@ struct bar_config {
 	bool strip_workspace_numbers;
 	bool binding_mode_indicator;
 	bool verbose;
+	pid_t pid;
 	struct {
 		char background[10];
 		char statusline[10];
@@ -191,6 +192,10 @@ bool load_config(const char *file);
 /** Reads the config from the given FILE.
  */
 bool read_config(FILE *file, bool is_active);
+/**
+ * Free config struct
+ */
+void free_config(struct sway_config *config);
 /**
  * Does variable replacement for a string based on the config's currently loaded variables.
  */
@@ -226,8 +231,7 @@ int sway_mouse_binding_cmp_qsort(const void *a, const void *b);
 int sway_mouse_binding_cmp_buttons(const void *a, const void *b);
 void free_sway_mouse_binding(struct sway_mouse_binding *smb);
 
-void load_swaybars(swayc_t *output, int output_idx);
+void load_swaybars();
-void terminate_swaybars(list_t *pids);
 void terminate_swaybg(pid_t pid);
 
 /**

include/container.h

@@ -82,9 +82,7 @@ struct sway_container {
 	char *class;
 	char *app_id;
 
-	// Used by output containers to keep track of swaybar/swaybg child
+	// Used by output containers to keep track of swaybg child processes.
-	// processes.
-	list_t *bar_pids;
 	pid_t bg_pid;
 
 	int gaps;

sway/commands.c

@@ -1526,14 +1526,7 @@ static struct cmd_results *cmd_reload(int argc, char **argv) {
 	}
 	if (!load_config(NULL)) return cmd_results_new(CMD_FAILURE, "reload", "Error(s) reloading config.");
 
-	int i;
+	load_swaybars();
-	swayc_t *cont = NULL;
-	for (i = 0; i < root_container.children->length; ++i) {
-		cont = root_container.children->items[i];
-		if (cont->type == C_OUTPUT) {
-			load_swaybars(cont, i);
-		}
-	}
 
 	arrange_windows(&root_container, -1, -1);
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);

sway/config.c

@@ -23,6 +23,8 @@
 
 struct sway_config *config = NULL;
 
+static void terminate_swaybar(pid_t pid);
+
 static void free_variable(struct sway_variable *var) {
 	free(var->name);
 	free(var->value);
@@ -60,6 +62,11 @@ static void free_bar(struct bar_config *bar) {
 	if (bar->outputs) {
 		free_flat_list(bar->outputs);
 	}
+
+	if (bar->pid != 0) {
+		terminate_swaybar(bar->pid);
+	}
+
 	free(bar);
 }
 
@@ -79,7 +86,7 @@ static void free_workspace_output(struct workspace_output *wo) {
 	free(wo);
 }
 
-static void free_config(struct sway_config *config) {
+void free_config(struct sway_config *config) {
 	int i;
 	for (i = 0; i < config->symbols->length; ++i) {
 		free_variable(config->symbols->items[i]);
@@ -471,32 +478,23 @@ void merge_output_config(struct output_config *dst, struct output_config *src) {
 	}
 }
 
-static void invoke_swaybar(swayc_t *output, struct bar_config *bar, int output_i) {
+static void invoke_swaybar(struct bar_config *bar) {
-	sway_log(L_DEBUG, "Invoking swaybar for output %s[%d] and bar %s", output->name, output_i, bar->id);
+	bar->pid = fork();
-
+	if (bar->pid == 0) {
-	size_t bufsize = 4;
-	char output_id[bufsize];
-	snprintf(output_id, bufsize, "%d", output_i);
-	output_id[bufsize-1] = 0;
-
-	pid_t *pid = malloc(sizeof(pid_t));
-	*pid = fork();
-	if (*pid == 0) {
 		if (!bar->swaybar_command) {
 			char *const cmd[] = {
 				"swaybar",
 				"-b",
 				bar->id,
-				output_id,
 				NULL,
 			};
 
 			execvp(cmd[0], cmd);
 		} else {
 			// run custom swaybar
-			int len = strlen(bar->swaybar_command) + strlen(bar->id) + strlen(output_id) + 6;
+			int len = strlen(bar->swaybar_command) + strlen(bar->id) + 5;
 			char *command = malloc(len * sizeof(char));
-			snprintf(command, len, "%s -b %s %s", bar->swaybar_command, bar->id, output_id);
+			snprintf(command, len, "%s -b %s", bar->swaybar_command, bar->id);
 
 			char *const cmd[] = {
 				"sh",
@@ -509,30 +507,15 @@ static void invoke_swaybar(swayc_t *output, struct bar_config *bar, int output_i
 			free(command);
 		}
 	}
-
-	// add swaybar pid to output
-	list_add(output->bar_pids, pid);
 }
 
-void terminate_swaybars(list_t *pids) {
+static void terminate_swaybar(pid_t pid) {
-	int i, ret;
+	int ret = kill(pid, SIGTERM);
-	pid_t *pid;
+	if (ret != 0) {
-	for (i = 0; i < pids->length; ++i) {
+		sway_log(L_ERROR, "Unable to terminate swaybar [pid: %d]", pid);
-		pid = pids->items[i];
+	} else {
-		ret = kill(*pid, SIGTERM);
+		int status;
-		if (ret != 0) {
+		waitpid(pid, &status, 0);
-			sway_log(L_ERROR, "Unable to terminate swaybar [pid: %d]", *pid);
-		} else {
-			int status;
-			waitpid(*pid, &status, 0);
-		}
-	}
-
-	// empty pids list
-	for (i = 0; i < pids->length; ++i) {
-		pid = pids->items[i];
-		list_del(pids, i);
-		free(pid);
 	}
 }
 
@@ -546,7 +529,20 @@ void terminate_swaybg(pid_t pid) {
 	}
 }
 
-void load_swaybars(swayc_t *output, int output_idx) {
+static bool active_output(const char *name) {
+	int i;
+	swayc_t *cont = NULL;
+	for (i = 0; i < root_container.children->length; ++i) {
+		cont = root_container.children->items[i];
+		if (cont->type == C_OUTPUT && strcasecmp(name, cont->name) == 0) {
+			return true;
+		}
+	}
+
+	return false;
+}
+
+void load_swaybars() {
 	// Check for bars
 	list_t *bars = create_list();
 	struct bar_config *bar = NULL;
@@ -558,7 +554,7 @@ void load_swaybars(swayc_t *output, int output_idx) {
 			int j;
 			for (j = 0; j < bar->outputs->length; ++j) {
 				char *o = bar->outputs->items[j];
-				if (!strcmp(o, "*") || !strcasecmp(o, output->name)) {
+				if (!strcmp(o, "*") || active_output(o)) {
 					apply = true;
 					break;
 				}
@@ -571,13 +567,13 @@ void load_swaybars(swayc_t *output, int output_idx) {
 		}
 	}
 
-	// terminate swaybar processes previously spawned for this
-	// output.
-	terminate_swaybars(output->bar_pids);
-
 	for (i = 0; i < bars->length; ++i) {
 		bar = bars->items[i];
-		invoke_swaybar(output, bar, output_idx);
+		if (bar->pid != 0) {
+			terminate_swaybar(bar->pid);
+		}
+		sway_log(L_DEBUG, "Invoking swaybar for bar id '%s'", bar->id);
+		invoke_swaybar(bar);
 	}
 
 	list_free(bars);
@@ -700,8 +696,8 @@ void apply_output_config(struct output_config *oc, swayc_t *output) {
 		}
 	}
 
-	// load swaybars for output
+	// reload swaybars
-	load_swaybars(output, output_i);
+	load_swaybars();
 }
 
 char *do_var_replacement(char *str) {
@@ -889,6 +885,7 @@ struct bar_config *default_bar_config(void) {
 	bar->strip_workspace_numbers = false;
 	bar->binding_mode_indicator = true;
 	bar->tray_padding = 2;
+	bar->pid = 0;
 	// set default colors
 	strcpy(bar->colors.background, "#000000ff");
 	strcpy(bar->colors.statusline, "#ffffffff");

sway/container.c

@@ -61,10 +61,6 @@ static void free_swayc(swayc_t *cont) {
 	if (cont->app_id) {
 		free(cont->app_id);
 	}
-	if (cont->bar_pids) {
-		terminate_swaybars(cont->bar_pids);
-		free_flat_list(cont->bar_pids);
-	}
 	if (cont->bg_pid != 0) {
 		terminate_swaybg(cont->bg_pid);
 	}
@@ -123,7 +119,6 @@ swayc_t *new_output(wlc_handle handle) {
 	output->width = size->w;
 	output->height = size->h;
 	output->unmanaged = create_list();
-	output->bar_pids = create_list();
 	output->bg_pid = 0;
 
 	apply_output_config(oc, output);

sway/ipc-server.c

@@ -628,6 +628,17 @@ json_object *ipc_json_describe_bar_config(struct bar_config *bar) {
 
 	json_object_object_add(json, "colors", colors);
 
+	// Add outputs if defined
+	if (bar->outputs && bar->outputs->length > 0) {
+		json_object *outputs = json_object_new_array();
+		int i;
+		for (i = 0; i < bar->outputs->length; ++i) {
+			const char *name = bar->outputs->items[i];
+			json_object_array_add(outputs, json_object_new_string(name));
+		}
+		json_object_object_add(json, "outputs", outputs);
+	}
+
 	return json;
 }
 

sway/main.c

@@ -228,6 +228,10 @@ int main(int argc, char **argv) {
 
 	ipc_terminate();
 
+	if (config) {
+		free_config(config);
+	}
+
 	return exit_value;
 }
 

swaybar/bar.c

@@ -1,9 +1,10 @@
 #include <stdlib.h>
 #include <unistd.h>
+#include <string.h>
 #include <fcntl.h>
 #include <errno.h>
-#include <sys/types.h>
 #include <sys/wait.h>
+#include <poll.h>
 
 #include "ipc-client.h"
 #include "list.h"
@@ -17,11 +18,7 @@
 static void bar_init(struct bar *bar) {
 	bar->config = init_config();
 	bar->status = init_status_line();
-	bar->output = malloc(sizeof(struct output));
+	bar->outputs = create_list();
-	bar->output->window = NULL;
-	bar->output->registry = NULL;
-	bar->output->workspaces = create_list();
-	bar->output->name = NULL;
 }
 
 static void spawn_status_cmd_proc(struct bar *bar) {
@@ -49,78 +46,109 @@ static void spawn_status_cmd_proc(struct bar *bar) {
 	}
 }
 
+struct output *new_output(const char *name) {
+	struct output *output = malloc(sizeof(struct output));
+	output->name = strdup(name);
+	output->window = NULL;
+	output->registry = NULL;
+	output->workspaces = create_list();
+	return output;
+}
 
-void bar_setup(struct bar *bar, const char *socket_path, const char *bar_id, int desired_output) {
+void bar_setup(struct bar *bar, const char *socket_path, const char *bar_id) {
 	/* initialize bar with default values */
 	bar_init(bar);
 
-	bar->output->registry = registry_poll();
-
-	if (!bar->output->registry->desktop_shell) {
-		sway_abort("swaybar requires the compositor to support the desktop-shell extension.");
-	}
-
 	/* connect to sway ipc */
 	bar->ipc_socketfd = ipc_open_socket(socket_path);
 	bar->ipc_event_socketfd = ipc_open_socket(socket_path);
 
-	ipc_bar_init(bar, desired_output, bar_id);
+	ipc_bar_init(bar, bar_id);
 
-	struct output_state *output = bar->output->registry->outputs->items[desired_output];
+	int i;
+	for (i = 0; i < bar->outputs->length; ++i) {
+		struct output *bar_output = bar->outputs->items[i];
 
-	bar->output->window = window_setup(bar->output->registry, output->width, 30, false);
+		bar_output->registry = registry_poll();
-	if (!bar->output->window) {
+
-		sway_abort("Failed to create window.");
+		if (!bar_output->registry->desktop_shell) {
+			sway_abort("swaybar requires the compositor to support the desktop-shell extension.");
+		}
+
+		struct output_state *output = bar_output->registry->outputs->items[bar_output->idx];
+
+		bar_output->window = window_setup(bar_output->registry, output->width, 30, false);
+		if (!bar_output->window) {
+			sway_abort("Failed to create window.");
+		}
+		desktop_shell_set_panel(bar_output->registry->desktop_shell, output->output, bar_output->window->surface);
+		desktop_shell_set_panel_position(bar_output->registry->desktop_shell, bar->config->position);
+
+		/* set font */
+		bar_output->window->font = bar->config->font;
+
+		/* set window height */
+		set_window_height(bar_output->window, bar->config->height);
 	}
-	desktop_shell_set_panel(bar->output->registry->desktop_shell, output->output, bar->output->window->surface);
-	desktop_shell_set_panel_position(bar->output->registry->desktop_shell, bar->config->position);
-
-	/* set font */
-	bar->output->window->font = bar->config->font;
-
-	/* set window height */
-	set_window_height(bar->output->window, bar->config->height);
-
 	/* spawn status command */
 	spawn_status_cmd_proc(bar);
 }
 
 void bar_run(struct bar *bar) {
-	fd_set readfds;
+	int pfds = bar->outputs->length + 2;
-	int activity;
+	struct pollfd *pfd = malloc(pfds * sizeof(struct pollfd));
 	bool dirty = true;
 
+	pfd[0].fd = bar->ipc_event_socketfd;
+	pfd[0].events = POLLIN;
+	pfd[1].fd = bar->status_read_fd;
+	pfd[1].events = POLLIN;
+
+	int i;
+	for (i = 0; i < bar->outputs->length; ++i) {
+		struct output *output = bar->outputs->items[i];
+		pfd[i+2].fd = wl_display_get_fd(output->registry->display);
+		pfd[i+2].events = POLLIN;
+	}
+
 	while (1) {
 		if (dirty) {
-			struct output *output = bar->output;
+			int i;
-			if (window_prerender(output->window) && output->window->cairo) {
+			for (i = 0; i < bar->outputs->length; ++i) {
-				render(output, bar->config, bar->status);
+				struct output *output = bar->outputs->items[i];
-				window_render(output->window);
+				if (window_prerender(output->window) && output->window->cairo) {
-				if (wl_display_dispatch(output->registry->display) == -1) {
+					render(output, bar->config, bar->status);
-					break;
+					window_render(output->window);
+					wl_display_flush(output->registry->display);
 				}
 			}
 		}
 
 		dirty = false;
-		FD_ZERO(&readfds);
-		FD_SET(bar->ipc_event_socketfd, &readfds);
-		FD_SET(bar->status_read_fd, &readfds);
 
-		activity = select(FD_SETSIZE, &readfds, NULL, NULL, NULL);
+		poll(pfd, pfds, -1);
-		if (activity < 0) {
-			sway_log(L_ERROR, "polling failed: %d", errno);
-		}
 
-		if (FD_ISSET(bar->ipc_event_socketfd, &readfds)) {
+		if (pfd[0].revents & POLLIN) {
 			sway_log(L_DEBUG, "Got IPC event.");
 			dirty = handle_ipc_event(bar);
 		}
 
-		if (bar->config->status_command && FD_ISSET(bar->status_read_fd, &readfds)) {
+		if (bar->config->status_command && pfd[1].revents & POLLIN) {
 			sway_log(L_DEBUG, "Got update from status command.");
 			dirty = handle_status_line(bar);
 		}
+
+		// dispatch wl_display events
+		for (i = 0; i < bar->outputs->length; ++i) {
+			struct output *output = bar->outputs->items[i];
+			if (pfd[i+2].revents & POLLIN) {
+				if (wl_display_dispatch(output->registry->display) == -1) {
+					sway_log(L_ERROR, "failed to dispatch wl: %d", errno);
+				}
+			} else {
+				wl_display_dispatch_pending(output->registry->display);
+			}
+		}
 	}
 }
 
@@ -149,6 +177,14 @@ static void free_output(struct output *output) {
 	free(output);
 }
 
+static void free_outputs(list_t *outputs) {
+	int i;
+	for (i = 0; i < outputs->length; ++i) {
+		free_output(outputs->items[i]);
+	}
+	list_free(outputs);
+}
+
 static void terminate_status_command(pid_t pid) {
 	if (pid) {
 		// terminate status_command process
@@ -164,7 +200,7 @@ static void terminate_status_command(pid_t pid) {
 
 void bar_teardown(struct bar *bar) {
 	free_config(bar->config);
-	free_output(bar->output);
+	free_outputs(bar->outputs);
 	free_status_line(bar->status);
 
 	/* close sockets/pipes */

swaybar/config.c

@@ -51,6 +51,8 @@ struct config *init_config() {
 	config->strip_workspace_numbers = false;
 	config->binding_mode_indicator = true;
 	config->workspace_buttons = true;
+	config->all_outputs = false;
+	config->outputs = create_list();
 
 	/* height */
 	config->height = 0;

swaybar/ipc.c

@@ -11,7 +11,7 @@ static void ipc_parse_config(struct config *config, const char *payload) {
 	json_object *bar_config = json_tokener_parse(payload);
 	json_object *tray_output, *mode, *hidden_bar, *position, *status_command;
 	json_object *font, *bar_height, *workspace_buttons, *strip_workspace_numbers;
-	json_object *binding_mode_indicator, *verbose, *colors, *sep_symbol;
+	json_object *binding_mode_indicator, *verbose, *colors, *sep_symbol, *outputs;
 	json_object_object_get_ex(bar_config, "tray_output", &tray_output);
 	json_object_object_get_ex(bar_config, "mode", &mode);
 	json_object_object_get_ex(bar_config, "hidden_bar", &hidden_bar);
@@ -25,6 +25,7 @@ static void ipc_parse_config(struct config *config, const char *payload) {
 	json_object_object_get_ex(bar_config, "verbose", &verbose);
 	json_object_object_get_ex(bar_config, "separator_symbol", &sep_symbol);
 	json_object_object_get_ex(bar_config, "colors", &colors);
+	json_object_object_get_ex(bar_config, "outputs", &outputs);
 
 	if (status_command) {
 		free(config->status_command);
@@ -61,6 +62,31 @@ static void ipc_parse_config(struct config *config, const char *payload) {
 		config->height = json_object_get_int(bar_height);
 	}
 
+	// free previous outputs list
+	int i;
+	for (i = 0; i < config->outputs->length; ++i) {
+		free(config->outputs->items[i]);
+	}
+	list_free(config->outputs);
+	config->outputs = create_list();
+
+	if (outputs) {
+		int length = json_object_array_length(outputs);
+		json_object *output;
+		const char *output_str;
+		for (i = 0; i < length; ++i) {
+			output = json_object_array_get_idx(outputs, i);
+			output_str = json_object_get_string(output);
+			if (strcmp("*", output_str) == 0) {
+				config->all_outputs = true;
+				break;
+			}
+			list_add(config->outputs, strdup(output_str));
+		}
+	} else {
+		config->all_outputs = true;
+	}
+
 	if (colors) {
 		json_object *background, *statusline, *separator;
 		json_object *focused_workspace_border, *focused_workspace_bg, *focused_workspace_text;
@@ -151,10 +177,14 @@ static void ipc_parse_config(struct config *config, const char *payload) {
 }
 
 static void ipc_update_workspaces(struct bar *bar) {
-	if (bar->output->workspaces) {
+	int i;
-		free_workspaces(bar->output->workspaces);
+	for (i = 0; i < bar->outputs->length; ++i) {
+		struct output *output = bar->outputs->items[i];
+		if (output->workspaces) {
+			free_workspaces(output->workspaces);
+		}
+		output->workspaces = create_list();
 	}
-	bar->output->workspaces = create_list();
 
 	uint32_t len = 0;
 	char *res = ipc_single_command(bar->ipc_socketfd, IPC_GET_WORKSPACES, NULL, &len);
@@ -164,7 +194,6 @@ static void ipc_update_workspaces(struct bar *bar) {
 		return;
 	}
 
-	int i;
 	int length = json_object_array_length(results);
 	json_object *ws_json;
 	json_object *num, *name, *visible, *focused, *out, *urgent;
@@ -178,14 +207,18 @@ static void ipc_update_workspaces(struct bar *bar) {
 		json_object_object_get_ex(ws_json, "output", &out);
 		json_object_object_get_ex(ws_json, "urgent", &urgent);
 
-		if (strcmp(json_object_get_string(out), bar->output->name) == 0) {
+		int j;
-			struct workspace *ws = malloc(sizeof(struct workspace));
+		for (j = 0; j < bar->outputs->length; ++j) {
-			ws->num = json_object_get_int(num);
+			struct output *output = bar->outputs->items[j];
-			ws->name = strdup(json_object_get_string(name));
+			if (strcmp(json_object_get_string(out), output->name) == 0) {
-			ws->visible = json_object_get_boolean(visible);
+				struct workspace *ws = malloc(sizeof(struct workspace));
-			ws->focused = json_object_get_boolean(focused);
+				ws->num = json_object_get_int(num);
-			ws->urgent = json_object_get_boolean(urgent);
+				ws->name = strdup(json_object_get_string(name));
-			list_add(bar->output->workspaces, ws);
+				ws->visible = json_object_get_boolean(visible);
+				ws->focused = json_object_get_boolean(focused);
+				ws->urgent = json_object_get_boolean(urgent);
+				list_add(output->workspaces, ws);
+			}
 		}
 	}
 
@@ -193,23 +226,59 @@ static void ipc_update_workspaces(struct bar *bar) {
 	free(res);
 }
 
-void ipc_bar_init(struct bar *bar, int outputi, const char *bar_id) {
+void ipc_bar_init(struct bar *bar, const char *bar_id) {
-	uint32_t len = 0;
+	// Get bar config
-	char *res = ipc_single_command(bar->ipc_socketfd, IPC_GET_OUTPUTS, NULL, &len);
+	uint32_t len = strlen(bar_id);
-	json_object *outputs = json_tokener_parse(res);
+	char *res = ipc_single_command(bar->ipc_socketfd, IPC_GET_BAR_CONFIG, bar_id, &len);
-	json_object *info = json_object_array_get_idx(outputs, outputi);
-	json_object *name;
-	json_object_object_get_ex(info, "name", &name);
-	bar->output->name = strdup(json_object_get_string(name));
-	free(res);
-	json_object_put(outputs);
-
-	len = strlen(bar_id);
-	res = ipc_single_command(bar->ipc_socketfd, IPC_GET_BAR_CONFIG, bar_id, &len);
 
 	ipc_parse_config(bar->config, res);
 	free(res);
 
+	// Get outputs
+	len = 0;
+	res = ipc_single_command(bar->ipc_socketfd, IPC_GET_OUTPUTS, NULL, &len);
+	json_object *outputs = json_tokener_parse(res);
+	int i;
+	int length = json_object_array_length(outputs);
+	json_object *output, *output_name, *output_active;
+	const char *name;
+	bool active;
+	for (i = 0; i < length; ++i) {
+		output = json_object_array_get_idx(outputs, i);
+		json_object_object_get_ex(output, "name", &output_name);
+		json_object_object_get_ex(output, "active", &output_active);
+		name = json_object_get_string(output_name);
+		active = json_object_get_boolean(output_active);
+		if (!active) {
+			continue;
+		}
+
+		bool use_output = false;
+		if (bar->config->all_outputs) {
+			use_output = true;
+		} else {
+			int j = 0;
+			for (j = 0; j < bar->config->outputs->length; ++j) {
+				const char *conf_name = bar->config->outputs->items[i];
+				if (strcasecmp(name, conf_name) == 0) {
+					use_output = true;
+					break;
+				}
+			}
+		}
+
+		if (!use_output) {
+			continue;
+		}
+
+		// add bar to the output
+		struct output *bar_output = new_output(name);
+		bar_output->idx = i;
+		list_add(bar->outputs, bar_output);
+	}
+	free(res);
+	json_object_put(outputs);
+
 	const char *subscribe_json = "[ \"workspace\", \"mode\" ]";
 	len = strlen(subscribe_json);
 	res = ipc_single_command(bar->ipc_event_socketfd, IPC_SUBSCRIBE, subscribe_json, &len);

swaybar/main.c

@@ -35,7 +35,7 @@ int main(int argc, char **argv) {
 	};
 
 	const char *usage =
-		"Usage: swaybar [options...] <output>\n"
+		"Usage: swaybar [options...]\n"
 		"\n"
 		"  -h, --help             Show help message and quit.\n"
 		"  -v, --version          Show the version number and quit.\n"
@@ -95,15 +95,9 @@ int main(int argc, char **argv) {
 		}
 	}
 
-	if (argc == optind) {
-		sway_abort("No output index provided");
-	}
-
-	int desired_output = atoi(argv[optind]);
-
 	signal(SIGTERM, sig_handler);
 
-	bar_setup(&swaybar, socket_path, bar_id, desired_output);
+	bar_setup(&swaybar, socket_path, bar_id);
 
 	free(socket_path);
 	free(bar_id);