sway: add bindgesture command

Co-authored-by: Michael Weiser <michael.weiser@gmx.de>

sway/commands/gesture.c

@@ -0,0 +1,166 @@
+#define _POSIX_C_SOURCE 200809L
+#include "sway/config.h"
+
+#include "gesture.h"
+#include "log.h"
+#include "stringop.h"
+#include "sway/commands.h"
+
+void free_gesture_binding(struct sway_gesture_binding *binding) {
+	if (!binding) {
+		return;
+	}
+	free(binding->input);
+	free(binding->command);
+	free(binding);
+}
+
+/**
+ * Returns true if the bindings have the same gesture type, direction, etc
+ */
+static bool binding_gesture_equal(struct sway_gesture_binding *binding_a,
+								  struct sway_gesture_binding *binding_b) {
+	if (strcmp(binding_a->input, binding_b->input) != 0) {
+		return false;
+	}
+
+	if (!gesture_equal(&binding_a->gesture, &binding_b->gesture)) {
+		return false;
+	}
+
+	if ((binding_a->flags & BINDING_EXACT) !=
+		(binding_b->flags & BINDING_EXACT)) {
+		return false;
+	}
+	return true;
+}
+
+/**
+ * Add gesture binding to config
+ */
+static struct cmd_results *gesture_binding_add(
+		struct sway_gesture_binding *binding,
+		const char *gesturecombo, bool warn) {
+	list_t *mode_bindings = config->current_mode->gesture_bindings;
+	// overwrite the binding if it already exists
+	bool overwritten = false;
+	for (int i = 0; i < mode_bindings->length; ++i) {
+		struct sway_gesture_binding *config_binding = mode_bindings->items[i];
+		if (binding_gesture_equal(binding, config_binding)) {
+			sway_log(SWAY_INFO, "Overwriting binding '%s' to `%s` from `%s`",
+					gesturecombo, binding->command, config_binding->command);
+			if (warn) {
+				config_add_swaynag_warning("Overwriting binding"
+						"'%s' to `%s` from `%s`",
+						gesturecombo, binding->command,
+						config_binding->command);
+			}
+			free_gesture_binding(config_binding);
+			mode_bindings->items[i] = binding;
+			overwritten = true;
+		}
+	}
+
+	if (!overwritten) {
+		list_add(mode_bindings, binding);
+		sway_log(SWAY_DEBUG, "bindgesture - Bound %s to command `%s`",
+				gesturecombo, binding->command);
+	}
+
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}
+
+/**
+ * Remove gesture binding from config
+ */
+static struct cmd_results *gesture_binding_remove(
+		struct sway_gesture_binding *binding, const char *gesturecombo) {
+	list_t *mode_bindings = config->current_mode->gesture_bindings;
+	for (int i = 0; i < mode_bindings->length; ++i) {
+		struct sway_gesture_binding *config_binding = mode_bindings->items[i];
+		if (binding_gesture_equal(binding, config_binding)) {
+			free_gesture_binding(config_binding);
+			free_gesture_binding(binding);
+			list_del(mode_bindings, i);
+			sway_log(SWAY_DEBUG, "unbindgesture - Unbound %s gesture",
+					gesturecombo);
+			return cmd_results_new(CMD_SUCCESS, NULL);
+		}
+	}
+
+	free_gesture_binding(binding);
+	return cmd_results_new(CMD_FAILURE, "Could not find gesture binding `%s`",
+			gesturecombo);
+}
+
+/**
+ * Parse and execute bindgesture or unbindgesture command.
+ */
+static struct cmd_results *cmd_bind_or_unbind_gesture(int argc, char **argv, bool unbind) {
+	int minargs = 2;
+	char *bindtype = "bindgesture";
+	if (unbind) {
+		minargs--;
+		bindtype = "unbindgesture";
+	}
+
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, bindtype, EXPECTED_AT_LEAST, minargs))) {
+		return error;
+	}
+	struct sway_gesture_binding *binding = calloc(1, sizeof(struct sway_gesture_binding));
+	if (!binding) {
+		return cmd_results_new(CMD_FAILURE, "Unable to allocate binding");
+	}
+	binding->input = strdup("*");
+
+	bool warn = true;
+
+	// Handle flags
+	while (argc > 0) {
+		if (strcmp("--exact", argv[0]) == 0) {
+			binding->flags |= BINDING_EXACT;
+		} else if (strcmp("--no-warn", argv[0]) == 0) {
+			warn = false;
+		} else if (strncmp("--input-device=", argv[0],
+					strlen("--input-device=")) == 0) {
+			free(binding->input);
+			binding->input = strdup(argv[0] + strlen("--input-device="));
+		} else {
+			break;
+		}
+		argv++;
+		argc--;
+	}
+
+	if (argc < minargs) {
+		free(binding);
+		return cmd_results_new(CMD_FAILURE,
+				"Invalid %s command (expected at least %d "
+				"non-option arguments, got %d)", bindtype, minargs, argc);
+	}
+
+	char* errmsg = NULL;
+	if ((errmsg = gesture_parse(argv[0], &binding->gesture))) {
+		free(binding);
+		struct cmd_results *final = cmd_results_new(CMD_FAILURE,
+				"Invalid %s command (%s)",
+				bindtype, errmsg);
+		free(errmsg);
+		return final;
+	}
+
+	if (unbind) {
+		return gesture_binding_remove(binding, argv[0]);
+	}
+	binding->command = join_args(argv + 1, argc - 1);
+	return gesture_binding_add(binding, argv[0], warn);
+}
+
+struct cmd_results *cmd_bindgesture(int argc, char **argv) {
+	return cmd_bind_or_unbind_gesture(argc, argv, false);
+}
+
+struct cmd_results *cmd_unbindgesture(int argc, char **argv) {
+	return cmd_bind_or_unbind_gesture(argc, argv, true);
+}

sway/commands/mode.c

@@ -11,10 +11,12 @@
 // Must be in order for the bsearch
 static const struct cmd_handler mode_handlers[] = {
 	{ "bindcode", cmd_bindcode },
+	{ "bindgesture", cmd_bindgesture },
 	{ "bindswitch", cmd_bindswitch },
 	{ "bindsym", cmd_bindsym },
 	{ "set", cmd_set },
 	{ "unbindcode", cmd_unbindcode },
+	{ "unbindgesture", cmd_unbindgesture },
 	{ "unbindswitch", cmd_unbindswitch },
 	{ "unbindsym", cmd_unbindsym },
 };
@@ -59,6 +61,7 @@ struct cmd_results *cmd_mode(int argc, char **argv) {
 		mode->keycode_bindings = create_list();
 		mode->mouse_bindings = create_list();
 		mode->switch_bindings = create_list();
+		mode->gesture_bindings = create_list();
 		mode->pango = pango;
 		list_add(config->modes, mode);
 	}