sway/commands/output: Add command for unplugging non-physical outputs

include/sway/commands.h

@@ -294,6 +294,7 @@ sway_cmd output_cmd_scale_filter;
 sway_cmd output_cmd_subpixel;
 sway_cmd output_cmd_toggle;
 sway_cmd output_cmd_transform;
+sway_cmd output_cmd_unplug;
 
 sway_cmd seat_cmd_attach;
 sway_cmd seat_cmd_cursor;

sway/commands/output.c

@@ -27,6 +27,7 @@ static const struct cmd_handler output_handlers[] = {
 	{ "subpixel", output_cmd_subpixel },
 	{ "toggle", output_cmd_toggle },
 	{ "transform", output_cmd_transform },
+	{ "unplug", output_cmd_unplug },
 };
 
 struct cmd_results *cmd_output(int argc, char **argv) {

sway/commands/output/unplug.c

@@ -0,0 +1,54 @@
+#include <strings.h>
+#include <wlr/config.h>
+#include <wlr/backend/headless.h>
+#include <wlr/backend/wayland.h>
+#if WLR_HAS_X11_BACKEND
+#include <wlr/backend/x11.h>
+#endif
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/output.h"
+
+static bool is_backend_allowed(struct wlr_backend *backend) {
+	if (wlr_backend_is_headless(backend)) {
+		return true;
+	}
+	if (wlr_backend_is_wl(backend)) {
+		return true;
+	}
+#if WLR_HAS_X11_BACKEND
+	if (wlr_backend_is_x11(backend)) {
+		return true;
+	}
+#endif
+	return false;
+}
+
+/**
+ * This command is intended for developer use only.
+ */
+struct cmd_results *output_cmd_unplug(int argc, char **argv) {
+	if (!config->handler_context.output_config) {
+		return cmd_results_new(CMD_FAILURE, "Missing output config");
+	}
+
+	const char *oc_name = config->handler_context.output_config->name;
+	if (strcmp(oc_name, "*") == 0) {
+		return cmd_results_new(CMD_INVALID, "Won't unplug all outputs");
+	}
+
+	struct sway_output *sway_output = all_output_by_name_or_id(oc_name);
+	if (!sway_output) {
+		return cmd_results_new(CMD_INVALID,
+			"Cannot unplug unknown output %s", oc_name);
+	}
+
+	if (!is_backend_allowed(sway_output->wlr_output->backend)) {
+		return cmd_results_new(CMD_INVALID,
+			"Can only unplug outputs with headless, wayland or x11 backend");
+	}
+
+	wlr_output_destroy(sway_output->wlr_output);
+
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}

sway/meson.build

@@ -198,6 +198,7 @@ sway_sources = files(
 	'commands/output/subpixel.c',
 	'commands/output/toggle.c',
 	'commands/output/transform.c',
+	'commands/output/unplug.c',
 
 	'tree/arrange.c',
 	'tree/container.c',