Implement bar bindsym

sway/commands/bar/bindsym.c

@@ -1,5 +1,7 @@
+#define _XOPEN_SOURCE 500
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "list.h"
@@ -7,5 +9,61 @@
 #include "stringop.h"
 
 struct cmd_results *bar_cmd_bindsym(int argc, char **argv) {
-	return cmd_results_new(CMD_FAILURE, "bindsym", "TODO"); // TODO
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "bar bindsym", EXPECTED_MORE_THAN, 1))) {
+		return error;
+	}
+	if (!config->current_bar) {
+		return cmd_results_new(CMD_FAILURE, "bar bindsym", "No bar defined.");
+	}
+
+	struct bar_binding *binding = calloc(1, sizeof(struct bar_binding));
+	if (!binding) {
+		return cmd_results_new(CMD_FAILURE, "bar bindsym",
+				"Unable to allocate bar binding");
+	}
+
+	binding->release = false;
+	if (strcmp("--release", argv[0]) == 0) {
+		binding->release = true;
+		argv++;
+		argc--;
+	}
+
+	binding->button = 0;
+	if (strncasecmp(argv[0], "button", strlen("button")) == 0 &&
+			strlen(argv[0]) == strlen("button0")) {
+		binding->button = argv[0][strlen("button")] - '1' + 1;
+	}
+	if (binding->button == 0) {
+		free_bar_binding(binding);
+		return cmd_results_new(CMD_FAILURE, "bar bindsym",
+				"Only button<n> is supported");
+	}
+
+	binding->command = join_args(argv + 1, argc - 1);
+
+	list_t *bindings = config->current_bar->bindings;
+	bool overwritten = false;
+	for (int i = 0; i < bindings->length; i++) {
+		struct bar_binding *other = bindings->items[i];
+		if (other->button == binding->button &&
+				other->release == binding->release) {
+			overwritten = true;
+			bindings->items[i] = binding;
+			free_bar_binding(other);
+			wlr_log(WLR_DEBUG, "[bar %s] Updated binding for button%u%s",
+					config->current_bar->id, binding->button,
+					binding->release ? " (release)" : "");
+			break;
+		}
+	}
+	if (!overwritten) {
+		list_add(bindings, binding);
+		wlr_log(WLR_DEBUG, "[bar %s] Added binding for button%u%s",
+				config->current_bar->id, binding->button,
+				binding->release ? " (release)" : "");
+	}
+
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }

sway/config/bar.c

@@ -28,6 +28,16 @@ static void terminate_swaybar(pid_t pid) {
 	}
 }
 
+void free_bar_binding(struct bar_binding *binding) {
+	if (!binding) {
+		return;
+	}
+	if (binding->command) {
+		free(binding->command);
+	}
+	free(binding);
+}
+
 void free_bar_config(struct bar_config *bar) {
 	if (!bar) {
 		return;
@@ -39,7 +49,11 @@ void free_bar_config(struct bar_config *bar) {
 	free(bar->status_command);
 	free(bar->font);
 	free(bar->separator_symbol);
-	// TODO: Free mouse bindings
+	while (bar->bindings->length) {
+		struct bar_binding *binding = bar->bindings->items[0];
+		list_del(bar->bindings, 0);
+		free_bar_binding(binding);
+	}
 	list_free(bar->bindings);
 	if (bar->outputs) {
 		free_flat_list(bar->outputs);

sway/ipc-json.c

@@ -623,6 +623,22 @@ json_object *ipc_json_describe_bar_config(struct bar_config *bar) {
 
 	json_object_object_add(json, "colors", colors);
 
+	if (bar->bindings->length > 0) {
+		json_object *bindings = json_object_new_array();
+		for (int i = 0; i < bar->bindings->length; ++i) {
+			struct bar_binding *binding = bar->bindings->items[i];
+			json_object *bind = json_object_new_object();
+			json_object_object_add(bind, "input_code",
+					json_object_new_int(binding->button));
+			json_object_object_add(bind, "command",
+					json_object_new_string(binding->command));
+			json_object_object_add(bind, "release",
+					json_object_new_boolean(binding->release));
+			json_object_array_add(bindings, bind);
+		}
+		json_object_object_add(json, "bindings", bindings);
+	}
+
 	// Add outputs if defined
 	if (bar->outputs && bar->outputs->length > 0) {
 		json_object *outputs = json_object_new_array();

sway/sway-bar.5.scd

@@ -60,6 +60,11 @@ Sway allows configuring swaybar in the sway configuration file.
 *height* <height>
 	Sets the height of the bar. Default height will match the font size.
 
+*bindsym* [--release] button<n> <command>
+	Executes _command_ when mouse button _n_ has been pressed (or if _released_
+	is given, when mouse button _n_ has been released). To disable the default
+	behavior for a button, use the command _nop_.
+
 ## TRAY
 
 Swaybar provides a system tray where third-party applications may place icons.