Add Retro Shift (Auto Shift for Tap Hold via Retro Tapping) and Custom Auto Shifts (#11059)

* Add Retro Shift and Custom Auto Shifts

* Fix compilation errors with no RETRO_SHIFT value

1 files changed, 20 insertions, 2 deletions

diff --git a/quantum/process_keycode/process_auto_shift.h b/quantum/process_keycode/process_auto_shift.h
index 00a9ab036..ac6a14374 100644
--- a/quantum/process_keycode/process_auto_shift.h
+++ b/quantum/process_keycode/process_auto_shift.h
@@ -22,13 +22,31 @@
 #    define AUTO_SHIFT_TIMEOUT 175
 #endif
 
+#define IS_LT(kc) ((kc) >= QK_LAYER_TAP && (kc) <= QK_LAYER_TAP_MAX)
+#define IS_MT(kc) ((kc) >= QK_MOD_TAP && (kc) <= QK_MOD_TAP_MAX)
+#define IS_RETRO(kc) (IS_MT(kc) || IS_LT(kc))
+#define DO_GET_AUTOSHIFT_TIMEOUT(keycode, record, ...) record
+// clang-format off
+#define AUTO_SHIFT_ALPHA KC_A ... KC_Z
+#define AUTO_SHIFT_NUMERIC KC_1 ... KC_0
+#define AUTO_SHIFT_SPECIAL          \
+             KC_TAB:                \
+        case KC_MINUS ... KC_SLASH: \
+        case KC_NONUS_BSLASH
+// clang-format on
+
 bool process_auto_shift(uint16_t keycode, keyrecord_t *record);
+void retroshift_poll_time(keyevent_t *event);
+void retroshift_swap_times(void);
 
 void     autoshift_enable(void);
 void     autoshift_disable(void);
 void     autoshift_toggle(void);
 bool     get_autoshift_state(void);
-uint16_t get_autoshift_timeout(void);
+uint16_t get_generic_autoshift_timeout(void);
+// clang-format off
+uint16_t (get_autoshift_timeout)(uint16_t keycode, keyrecord_t *record);
 void     set_autoshift_timeout(uint16_t timeout);
 void     autoshift_matrix_scan(void);
-bool     get_auto_shifted_key(uint16_t keycode, keyrecord_t *record);
+bool     get_custom_auto_shifted_key(uint16_t keycode, keyrecord_t *record);
+// clang-format on