Wayland: Detect keyboard layout automatically

6 files changed, 42 insertions, 5 deletions

diff --git a/src/imv.c b/src/imv.c
index 7d660dd..d5c2c3c 100644
--- a/src/imv.c
+++ b/src/imv.c
@@ -1081,6 +1081,11 @@ static bool setup_window(struct imv *imv)
   {
     imv->keyboard = imv_keyboard_create();
     assert(imv->keyboard);
+
+    const char *keymap = imv_window_keymap(imv->window);
+    if (keymap) {
+      imv_keyboard_set_keymap(imv->keyboard, keymap);
+    }
   }
 
   {
diff --git a/src/keyboard.c b/src/keyboard.c
index 16b2c9d..af79006 100644
--- a/src/keyboard.c
+++ b/src/keyboard.c
@@ -22,9 +22,9 @@ struct imv_keyboard *imv_keyboard_create(void)
   struct xkb_rule_names names = {
     .rules = NULL,
     .model = NULL,
-    .layout = "gb",
+    .layout = NULL,
     .variant = NULL,
-    .options = "caps:escape,compose:ralt"
+    .options = NULL,
   };
   keyboard->keymap = xkb_keymap_new_from_names(keyboard->context, &names, 0);
   assert(keyboard->keymap);
@@ -116,3 +116,11 @@ size_t imv_keyboard_get_text(struct imv_keyboard *keyboard, int scancode, char *
 {
   return xkb_state_key_get_utf8(keyboard->state, scancode + scancode_offset, buf, buflen);
 }
+
+void imv_keyboard_set_keymap(struct imv_keyboard *keyboard, const char *keymap)
+{
+  xkb_keymap_unref(keyboard->keymap);
+  keyboard->keymap = xkb_keymap_new_from_string(keyboard->context, keymap, XKB_KEYMAP_FORMAT_TEXT_V1, XKB_KEYMAP_COMPILE_NO_FLAGS);
+  xkb_state_unref(keyboard->state);
+  keyboard->state = xkb_state_new(keyboard->keymap);
+}
diff --git a/src/keyboard.h b/src/keyboard.h
index 755bae2..7bbb202 100644
--- a/src/keyboard.h
+++ b/src/keyboard.h
@@ -24,4 +24,7 @@ char *imv_keyboard_describe_key(struct imv_keyboard *keyboard, int scancode);
 /* Write the null-terminated text generated by scancode being pressed into buf */
 size_t imv_keyboard_get_text(struct imv_keyboard *keyboard, int scancode, char *buf, size_t buflen);
 
+/* Initialise the keymap from a string containing the description */
+void imv_keyboard_set_keymap(struct imv_keyboard *keyboard, const char *keymap);
+
 #endif
diff --git a/src/window.h b/src/window.h
index c185b6f..7db1125 100644
--- a/src/window.h
+++ b/src/window.h
@@ -73,4 +73,6 @@ typedef void (*imv_event_handler)(void *data, const struct imv_event *e);
 
 void imv_window_pump_events(struct imv_window *window, imv_event_handler handler, void *data);
 
+const char *imv_window_keymap(struct imv_window *window);
+
 #endif
diff --git a/src/wl_window.c b/src/wl_window.c
index a6b16ae..635fd4f 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -9,6 +9,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
+#include <sys/mman.h>
 
 #include <wayland-client.h>
 #include <wayland-egl.h>
@@ -42,6 +43,8 @@ struct imv_window {
   bool fullscreen;
   int scale;
 
+  char *keymap;
+
   struct {
     struct {
       double last;
@@ -92,11 +95,17 @@ static const struct xdg_wm_base_listener shell_listener_xdg = {
 static void keyboard_keymap(void *data, struct wl_keyboard *keyboard,
     uint32_t format, int32_t fd, uint32_t size)
 {
-  (void)data;
   (void)keyboard;
   (void)format;
-  (void)fd;
-  (void)size;
+  struct imv_window *window = data;
+  if (window->keymap) {
+    free(window->keymap);
+  }
+  window->keymap = malloc(size);
+  char *src = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+  memcpy(window->keymap, src, size);
+  munmap(src, size);
+  close(fd);
 }
 
 static void keyboard_enter(void *data, struct wl_keyboard *keyboard,
@@ -785,3 +794,8 @@ void imv_window_pump_events(struct imv_window *window, imv_event_handler handler
     }
   }
 }
+
+const char *imv_window_keymap(struct imv_window *window)
+{
+  return window->keymap;
+}
diff --git a/src/x11_window.c b/src/x11_window.c
index 15042a4..7bf7d2b 100644
--- a/src/x11_window.c
+++ b/src/x11_window.c
@@ -332,3 +332,8 @@ void imv_window_pump_events(struct imv_window *window, imv_event_handler handler
   }
 }
 
+const char *imv_window_keymap(struct imv_window *window)
+{
+  (void)window;
+  return NULL;
+}