Add a new xkb_switch_layout command

This allows users to programatically change the active layout.

1 files changed, 51 insertions, 0 deletions

diff --git a/sway/commands/input/xkb_switch_layout.c b/sway/commands/input/xkb_switch_layout.c
new file mode 100644
index 00000000..fdf21452
--- /dev/null
+++ b/sway/commands/input/xkb_switch_layout.c
@@ -0,0 +1,51 @@
+#define _POSIX_C_SOURCE 200809L
+#include "sway/config.h"
+#include "sway/commands.h"
+#include "sway/input/input-manager.h"
+#include "log.h"
+
+static void switch_layout(struct wlr_keyboard *kbd, xkb_layout_index_t idx) {
+        xkb_layout_index_t num_layouts = xkb_keymap_num_layouts(kbd->keymap);
+        if (idx >= num_layouts) {
+                return;
+        }
+        wlr_keyboard_notify_modifiers(kbd, kbd->modifiers.depressed,
+                kbd->modifiers.latched, kbd->modifiers.locked, idx);
+}
+
+struct cmd_results *input_cmd_xkb_switch_layout(int argc, char **argv) {
+        struct cmd_results *error = NULL;
+        if ((error = checkarg(argc, "xkb_switch_layout", EXPECTED_EQUAL_TO, 1))) {
+                return error;
+        }
+        struct input_config *ic = config->handler_context.input_config;
+        if (!ic) {
+                return cmd_results_new(CMD_FAILURE, "No input device defined.");
+        }
+
+        if (config->reading || !config->active) {
+                return cmd_results_new(CMD_DEFER, NULL);
+        }
+
+        const char *layout_str = argv[0];
+
+        char *end;
+        int layout = strtol(layout_str, &end, 10);
+        if (layout_str[0] == '\0' || end[0] != '\0' || layout < 0) {
+                return cmd_results_new(CMD_FAILURE, "Invalid layout index.");
+        }
+
+        struct sway_input_device *dev;
+        wl_list_for_each(dev, &server.input->devices, link) {
+                if (strcmp(ic->identifier, "*") != 0 &&
+                                strcmp(ic->identifier, dev->identifier) != 0) {
+                        continue;
+                }
+                if (dev->wlr_device->type != WLR_INPUT_DEVICE_KEYBOARD) {
+                        continue;
+                }
+                switch_layout(dev->wlr_device->keyboard, layout);
+        }
+
+        return cmd_results_new(CMD_SUCCESS, NULL);
+}