add seat sub command 'xcursor_theme'

New 'seat <name> xcursor_theme <theme> [<size>]' command that
configures the default xcursor theme.

The default seat's xcursor theme is also propagated to XWayland, and
exported through the XCURSOR_THEME and XCURSOR_SIZE environment
variables. This is done every time the default seat's configuration is
changed.

2 files changed, 34 insertions, 0 deletions

diff --git a/sway/commands/seat.c b/sway/commands/seat.c
index aa36ba95..a827bf74 100644
--- a/sway/commands/seat.c
+++ b/sway/commands/seat.c
@@ -13,6 +13,7 @@ static struct cmd_handler seat_handlers[] = {
 	{ "fallback", seat_cmd_fallback },
 	{ "hide_cursor", seat_cmd_hide_cursor },
 	{ "pointer_constraint", seat_cmd_pointer_constraint },
+	{ "xcursor_theme", seat_cmd_xcursor_theme },
 };
 
 struct cmd_results *cmd_seat(int argc, char **argv) {
diff --git a/sway/commands/seat/xcursor_theme.c b/sway/commands/seat/xcursor_theme.c
new file mode 100644
index 00000000..202f35b9
--- /dev/null
+++ b/sway/commands/seat/xcursor_theme.c
@@ -0,0 +1,33 @@
+#define _POSIX_C_SOURCE 200809L
+#include <string.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+
+struct cmd_results *seat_cmd_xcursor_theme(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "xcursor_theme", EXPECTED_AT_LEAST, 1)) ||
+		(error = checkarg(argc, "xcursor_theme", EXPECTED_AT_MOST, 2))) {
+		return error;
+	}
+	if (!config->handler_context.seat_config) {
+		return cmd_results_new(CMD_FAILURE, "No seat defined");
+	}
+
+	const char *theme_name = argv[0];
+	unsigned size = 24;
+
+	if (argc == 2) {
+		char *end;
+		size = strtoul(argv[1], &end, 10);
+		if (*end) {
+			return cmd_results_new(
+				CMD_INVALID, "Expected a positive integer size");
+		}
+	}
+
+	free(config->handler_context.seat_config->xcursor_theme.name);
+	config->handler_context.seat_config->xcursor_theme.name = strdup(theme_name);
+	config->handler_context.seat_config->xcursor_theme.size = size;
+
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}