buffyboard: add sticky_shift config option

Adds a keyboard config option to control shift key behavior.
When sticky_shift is enabled (default), the keyboard remains
in uppercase mode until the shift key is pressed again.
When disabled, the keyboard switches back into lowercase mode
when a non-modifier key is pressed.

buffyboard/buffyboard.conf

@@ -1,5 +1,6 @@
 [keyboard]
 haptic_feedback=true
+#sticky_shift=true
 
 [theme]
 default=breezy-light

buffyboard/config.c

@@ -45,6 +45,10 @@ static int parsing_handler(void* user_data, const char* section, const char* key
             if (bbx_config_parse_bool(value, &(opts->keyboard.haptic_feedback))) {
                 return 1;
             }
+        } else if (strcmp(key, "sticky_shift") == 0) {
+            if (bbx_config_parse_bool(value, &(opts->keyboard.sticky_shift))) {
+                return 1;
+            }
         }
     } else if (strcmp(section, "theme") == 0) {
         if (strcmp(key, "default") == 0) {
@@ -87,6 +91,7 @@ static int parsing_handler(void* user_data, const char* section, const char* key
 
 void bb_config_init_opts(bb_config_opts *opts) {
     opts->keyboard.haptic_feedback = true;
+    opts->keyboard.sticky_shift = true;
     opts->theme.default_id = BBX_THEMES_THEME_BREEZY_DARK;
     opts->input.pointer = true;
     opts->input.touchscreen = true;

buffyboard/config.h

@@ -17,6 +17,9 @@
 typedef struct {
     /* If true, vibrate on key presses */
     bool haptic_feedback;
+    /* If true, remain in uppercase mode until shift is pressed again.
+     * If false, switch back to lowercase after a non-modifier key is pressed. */
+    bool sticky_shift;
 } bb_config_opts_keyboard;
 
 /**

buffyboard/main.c

@@ -116,6 +116,11 @@ static void keyboard_value_changed_cb(lv_event_t *event) {
     /* Pop any previously checked modifiers when a non-modifier key was pressed */
     if (!is_modifier) {
         pop_checked_modifier_keys();
+
+        /* If sticky_shift is disabled and we're in uppercase mode, switch back to lowercase */
+        if (!conf_opts.keyboard.sticky_shift && lv_keyboard_get_mode(keyboard) == LV_KEYBOARD_MODE_TEXT_UPPER) {
+            lv_keyboard_set_mode(keyboard, LV_KEYBOARD_MODE_TEXT_LOWER);
+        }
     }
 }