Implement bindsym --to-code

* `bindsym --to-code` enables keysym to keycode translation.
* If there are no `xkb_layout` commands in the config file, the translation
uses the XKB_DEFAULT_LAYOUT value.
* It there is one or more `xkb_layout` command, the translation uses
the first one.
* If the translation is unsuccessful, a message is logged and the binding
is stored as BINDING_KEYSYM.
* The binding keysyms are stored and re-translated when a change in the input
configuration may affect the translated bindings.

1 files changed, 25 insertions, 0 deletions

diff --git a/sway/commands/input.c b/sway/commands/input.c
index b72bd76b..903d574f 100644
--- a/sway/commands/input.c
+++ b/sway/commands/input.c
@@ -39,6 +39,30 @@ static struct cmd_handler input_config_handlers[] = {
         { "xkb_numlock", input_cmd_xkb_numlock },
 };
 
+/**
+ * Re-translate keysyms if a change in the input config could affect them.
+ */
+static void retranslate_keysyms(struct input_config *input_config) {
+        bool matched = false;
+        for (int i = 0; i < config->input_configs->length; ++i) {
+                struct input_config *ic = config->input_configs->items[i];
+                matched |= ic->identifier == input_config->identifier;
+
+                // the first configured xkb_layout
+                if (ic->xkb_layout) {
+                        if (matched) {
+                                translate_keysyms(ic->xkb_layout);
+                        }
+
+                        // nothing has changed
+                        return;
+                }
+        }
+
+        // no xkb_layout has been set, restore the default
+        translate_keysyms(getenv("XKB_DEFAULT_LAYOUT"));
+}
+
 struct cmd_results *cmd_input(int argc, char **argv) {
         struct cmd_results *error = NULL;
         if ((error = checkarg(argc, "input", EXPECTED_AT_LEAST, 2))) {
@@ -73,6 +97,7 @@ struct cmd_results *cmd_input(int argc, char **argv) {
                         store_input_config(config->handler_context.input_config);
 
                 input_manager_apply_input_config(ic);
+                retranslate_keysyms(ic);
         } else {
                 free_input_config(config->handler_context.input_config);
         }