Implement input_cmd_xkb_file (#3999)

Adds a new commend "xkb_file", which constructs the internal
xkb_keymap from a xkb file rather than an RMLVO configuration.
This allows greater flexibility when specifying xkb configurations.
An xkb file can be dumped with the xkbcomp program.

2 files changed, 31 insertions, 2 deletions

diff --git a/sway/commands/input.c b/sway/commands/input.c
index 588ef2d5..2289ede5 100644
--- a/sway/commands/input.c
+++ b/sway/commands/input.c
@@ -28,6 +28,7 @@ static struct cmd_handler input_handlers[] = {
         { "scroll_method", input_cmd_scroll_method },
         { "tap", input_cmd_tap },
         { "tap_button_map", input_cmd_tap_button_map },
+        { "xkb_file", input_cmd_xkb_file },
         { "xkb_layout", input_cmd_xkb_layout },
         { "xkb_model", input_cmd_xkb_model },
         { "xkb_options", input_cmd_xkb_options },
@@ -48,8 +49,8 @@ static struct cmd_handler input_config_handlers[] = {
 static void retranslate_keysyms(struct input_config *input_config) {
         for (int i = 0; i < config->input_configs->length; ++i) {
                 struct input_config *ic = config->input_configs->items[i];
-                if (ic->xkb_layout) {
-                        // this is the first config with xkb_layout
+                if (ic->xkb_layout || ic->xkb_file) {
+                        // this is the first config with xkb_layout or xkb_file
                         if (ic->identifier == input_config->identifier) {
                                 translate_keysyms(ic);
                         }
diff --git a/sway/commands/input/xkb_file.c b/sway/commands/input/xkb_file.c
new file mode 100644
index 00000000..063f544d
--- /dev/null
+++ b/sway/commands/input/xkb_file.c
@@ -0,0 +1,28 @@
+#define _POSIX_C_SOURCE 200809L
+#include "sway/config.h"
+#include "sway/commands.h"
+#include "sway/input/input-manager.h"
+#include "log.h"
+
+struct cmd_results *input_cmd_xkb_file(int argc, char **argv) {
+        struct cmd_results *error = NULL;
+        if ((error = checkarg(argc, "xkb_file", 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 (strcmp(argv[0], "-") == 0) {
+                free(ic->xkb_file);
+                ic->xkb_file = NULL;
+        } else {
+                ic->xkb_file = strdup(argv[0]);
+        }
+        ic->xkb_file_is_set = true;
+
+        sway_log(SWAY_DEBUG, "set-xkb_file for config: %s file: %s",
+                        ic->identifier, ic->xkb_file);
+        return cmd_results_new(CMD_SUCCESS, NULL);
+}