gistfile1.txt

bool process_record_user(uint16_t keycode, keyrecord_t *record) {
    static uint16_t my_hash_timer;
    switch (keycode) {
        case S_ESCAPE:
            if(record->event.pressed) {
              my_hash_timer = timer_read();
              register_code(KC_LSFT); // Change the key to be held here
            } else {
              unregister_code(KC_LSFT); // Change the key that was held here, too!
              if (timer_elapsed(my_hash_timer) < TAPPING_TERM) {
                // if command held, send all command+escape sequence AND toggle qwerty/colemak layer
                if (get_mods() & (MOD_BIT(KC_LGUI) | MOD_BIT(KC_RGUI))) {
                    register_code(KC_LGUI);
                    tap_code(KC_ESC);
                    unregister_code(KC_LGUI);
                    layer_invert(_QWERTY);
                } else {
                // else just send escape
                    tap_code(KC_ESC);
                }
              }
            }
            return false;
    }
    return true;
};