Adds a way to separate tab from AUTO_SHIFT_SPECIAL. (qmk#20996)

docs/feature_auto_shift.md

@@ -133,7 +133,17 @@ groups in the below fallback switch.
 ### NO_AUTO_SHIFT_SPECIAL (simple define)
 
 Do not Auto Shift special keys, which include -\_, =+, [{, ]}, ;:, '", ,<, .>,
-and /?
+/?, and the KC_TAB.
+
+### NO_AUTO_SHIFT_TAB (simple define)
+
+Do not Auto Shift KC_TAB but leave Auto Shift enabled for the other special
+characters.
+
+### NO_AUTO_SHIFT_SYMBOLS (simple define)
+
+Do not Auto Shift symbol keys, which include -\_, =+, [{, ]}, ;:, '", ,<, .>,
+and /?.
 
 ### NO_AUTO_SHIFT_NUMERIC (simple define)
 
@@ -143,9 +153,13 @@ Do not Auto Shift numeric keys, zero through nine.
 
 Do not Auto Shift alpha characters, which include A through Z.
 
+### AUTO_SHIFT_ENTER (simple define)
+
+Auto Shift the enter key.
+
 ### Auto Shift Per Key
 
-There are functions that allows you to determine which keys shold be autoshifted, much like the tap-hold keys.
+There are functions that allows you to determine which keys should be autoshifted, much like the tap-hold keys.
 
 The first of these, used to simply add a key to Auto Shift, is `get_custom_auto_shifted_key`:
 
@@ -172,9 +186,15 @@ bool get_auto_shifted_key(uint16_t keycode, keyrecord_t *record) {
         case KC_1 ... KC_0:
 #    endif
 #    ifndef NO_AUTO_SHIFT_SPECIAL
+#    ifndef NO_AUTO_SHIFT_TAB
         case KC_TAB:
-        case KC_MINUS ... KC_SLASH:
-        case KC_NONUS_BACKSLASH:
+#    endif
+#    ifndef NO_AUTO_SHIFT_SYMBOLS
+        case AUTO_SHIFT_SYMBOLS:
+#    endif
+#    endif
+#    ifdef AUTO_SHIFT_ENTER
+        case KC_ENT:
 #    endif
             return true;
     }
@@ -192,6 +212,25 @@ Enables keyrepeat.
 
 Disables automatically keyrepeating when `AUTO_SHIFT_TIMEOUT` is exceeded.
 
+
+### AUTO_SHIFT_ALPHA (predefined key group)
+
+A predefined group of keys representing A through Z.
+
+### AUTO_SHIFT_NUMERIC (predefined key group)
+
+A predefined group of keys representing 0 through 9. Note, these are defined as
+1 through 0 since that is the order they normally appear in.
+
+### AUTO_SHIFT_SYMBOLS (predefined key group)
+
+A predefined group of keys representing symbolic characters which include -\_, =+, [{, ]}, ;:, '", ,<, .>,
+and /?.
+
+### AUTO_SHIFT_SPECIAL (predefined key group)
+
+A predefined group of keys that combines AUTO_SHIFT_SYMBOLS and KC_TAB.
+
 ## Custom Shifted Values
 
 Especially on small keyboards, the default shifted value for many keys is not

quantum/process_keycode/process_auto_shift.c

@@ -75,7 +75,15 @@ __attribute__((weak)) bool get_auto_shifted_key(uint16_t keycode, keyrecord_t *r
         case AUTO_SHIFT_NUMERIC:
 #    endif
 #    ifndef NO_AUTO_SHIFT_SPECIAL
-        case AUTO_SHIFT_SPECIAL:
+#        ifndef NO_AUTO_SHIFT_TAB
+        case KC_TAB:
+#        endif
+#        ifndef NO_AUTO_SHIFT_SYMBOLS
+        case AUTO_SHIFT_SYMBOLS:
+#        endif
+#    endif
+#    ifdef AUTO_SHIFT_ENTER
+        case KC_ENT:
 #    endif
             return true;
     }

quantum/process_keycode/process_auto_shift.h

@@ -28,10 +28,14 @@
 // clang-format off
 #define AUTO_SHIFT_ALPHA KC_A ... KC_Z
 #define AUTO_SHIFT_NUMERIC KC_1 ... KC_0
+#define AUTO_SHIFT_SYMBOLS          \
+             KC_MINUS ... KC_SLASH: \
+        case KC_NONUS_BACKSLASH
+
+// Kept to avoid breaking existing keymaps.
 #define AUTO_SHIFT_SPECIAL          \
              KC_TAB:                \
-        case KC_MINUS ... KC_SLASH: \
-        case KC_NONUS_BACKSLASH
+        case AUTO_SHIFT_SYMBOLS
 // clang-format on
 
 bool process_auto_shift(uint16_t keycode, keyrecord_t *record);