Avoid adding duplicate criteria for no_focus and command

include/sway/criteria.h

@@ -40,6 +40,9 @@ struct criteria {
 };
 
 bool criteria_is_empty(struct criteria *criteria);
+bool criteria_is_equal(struct criteria *left, struct criteria *right);
+
+bool criteria_already_exists(struct criteria *criteria);
 
 void criteria_destroy(struct criteria *criteria);
 

sway/commands/for_window.c

@@ -22,6 +22,14 @@ struct cmd_results *cmd_for_window(int argc, char **argv) {
 	criteria->type = CT_COMMAND;
 	criteria->cmdlist = join_args(argv + 1, argc - 1);
 
+	// Check if it already exists
+	if (criteria_already_exists(criteria)) {
+		sway_log(SWAY_DEBUG, "for_window already exists: '%s' -> '%s'",
+				criteria->raw, criteria->cmdlist);
+		criteria_destroy(criteria);
+		return cmd_results_new(CMD_SUCCESS, NULL);
+	}
+
 	list_add(config->criteria, criteria);
 	sway_log(SWAY_DEBUG, "for_window: '%s' -> '%s' added", criteria->raw, criteria->cmdlist);
 

sway/commands/no_focus.c

@@ -18,7 +18,16 @@ struct cmd_results *cmd_no_focus(int argc, char **argv) {
 		return error;
 	}
 
+
 	criteria->type = CT_NO_FOCUS;
+
+	// Check if it already exists
+	if (criteria_already_exists(criteria)) {
+		sway_log(SWAY_DEBUG, "no_focus already exists: '%s'", criteria->raw);
+		criteria_destroy(criteria);
+		return cmd_results_new(CMD_SUCCESS, NULL);
+	}
+
 	list_add(config->criteria, criteria);
 
 	return cmd_results_new(CMD_SUCCESS, NULL);

sway/criteria.c

@@ -685,3 +685,36 @@ cleanup:
 	criteria_destroy(criteria);
 	return NULL;
 }
+
+bool criteria_is_equal(struct criteria *left, struct criteria *right) {
+	if (left->type != right->type) {
+		return false;
+	}
+	// XXX Only implemented for CT_NO_FOCUS for now.
+	if (left->type == CT_NO_FOCUS) {
+		return strcmp(left->raw, right->raw) == 0;
+	}
+	if (left->type == CT_COMMAND) {
+		return strcmp(left->raw, right->raw) == 0
+				&& strcmp(left->cmdlist, right->cmdlist) == 0;
+	}
+	return false;
+}
+
+bool criteria_already_exists(struct criteria *criteria) {
+	// XXX Only implemented for CT_NO_FOCUS and CT_COMMAND for now.
+	// While criteria_is_equal also obeys this limitation, this is a shortcut
+	// to avoid processing the list.
+	if (criteria->type != CT_NO_FOCUS && criteria->type != CT_COMMAND) {
+		return false;
+	}
+
+	list_t *criterias = config->criteria;
+	for (int i = 0; i < criterias->length; ++i) {
+		struct criteria *existing = criterias->items[i];
+		if (criteria_is_equal(criteria, existing)) {
+			return true;
+		}
+	}
+	return false;
+}