implemented seat detach command

include/sway/commands.h

@@ -265,6 +265,7 @@ sway_cmd output_cmd_transform;
 
 sway_cmd seat_cmd_attach;
 sway_cmd seat_cmd_cursor;
+sway_cmd seat_cmd_detach;
 sway_cmd seat_cmd_fallback;
 sway_cmd seat_cmd_hide_cursor;
 sway_cmd seat_cmd_pointer_constraint;

include/sway/config.h

@@ -571,6 +571,9 @@ struct seat_attachment_config *seat_config_get_attachment(
 
 struct seat_config *store_seat_config(struct seat_config *seat);
 
+void seat_config_remove_attachment(
+	struct seat_config *seat_config, char *identifier);
+
 int output_name_cmp(const void *item, const void *data);
 
 void output_get_identifier(char *identifier, size_t len,

sway/commands/seat.c

@@ -10,6 +10,7 @@
 static struct cmd_handler seat_handlers[] = {
 	{ "attach", seat_cmd_attach },
 	{ "cursor", seat_cmd_cursor },
+	{ "detach", seat_cmd_detach },
 	{ "fallback", seat_cmd_fallback },
 	{ "hide_cursor", seat_cmd_hide_cursor },
 	{ "pointer_constraint", seat_cmd_pointer_constraint },

sway/commands/seat/detach.c

@@ -0,0 +1,27 @@
+#define _XOPEN_SOURCE 700
+#include <string.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+
+struct cmd_results *seat_cmd_detach(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "detach", EXPECTED_AT_LEAST, 1))) {
+		return error;
+	}
+	struct seat_config *current_seat_config = config->handler_context.seat_config;
+	if (!current_seat_config) {
+		return cmd_results_new(CMD_FAILURE, "detach", "No seat defined");
+	}
+
+	int i;
+	i = list_seq_find(config->seat_configs, seat_name_cmp, current_seat_config->name);
+	if (i >= 0) {
+		struct seat_config *sc = config->seat_configs->items[i];
+		seat_config_remove_attachment(sc, strdup(argv[0]));
+	}
+
+	if (!config->validating) {
+		input_manager_apply_seat_config(new_seat_config(current_seat_config->name));
+	}
+	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
+}

sway/config/seat.c

@@ -191,3 +191,14 @@ struct seat_attachment_config *seat_config_get_attachment(
 
 	return NULL;
 }
+
+void seat_config_remove_attachment(struct seat_config *seat_config, char *identifier) {
+	for (int i = 0; i < seat_config->attachments->length; ++i) {
+		struct seat_attachment_config *attachment = seat_config->attachments->items[i];
+		if (strcmp(attachment->identifier, identifier) == 0) {
+			list_del(seat_config->attachments, i);
+			seat_attachment_config_free(attachment);
+			break;
+		}
+	}
+}

sway/meson.build

@@ -82,6 +82,7 @@ sway_sources = files(
 	'commands/seat.c',
 	'commands/seat/attach.c',
 	'commands/seat/cursor.c',
+	'commands/seat/detach.c',
 	'commands/seat/fallback.c',
 	'commands/seat/hide_cursor.c',
 	'commands/seat/pointer_constraint.c',

sway/sway-input.5.scd

@@ -150,6 +150,11 @@ sitting in their own "seat").
 	Attach an input device to this seat by its input identifier. A special
 	value of "\*" will attach all devices to the seat.
 
+*seat* <name> detach <input\_identifier>
+	Detaches an input device from this seat by its input identifier.
+
+	Note: the fallback seat will catch input devices with no seat.
+
 *seat* <seat> cursor move|set <x> <y>
 	Move specified seat's cursor relative to current position or wrap to
 	absolute coordinates (with respect to the global coordinate space).