Add a user callback for pre process record (#20584)

docs/understanding_qmk.md

@@ -130,6 +130,8 @@ The `process_record()` function itself is deceptively simple, but hidden within
 * [`void action_exec(keyevent_t event)`](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/action.c#L78-L140)
     * [`void pre_process_record_quantum(keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/quantum.c#L204)
       * [`bool process_combo(uint16_t keycode, keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/process_keycode/process_combo.c#L521)
+      * [`bool pre_process_record_kb(uint16_t keycode, keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/27119fa77e8a1b95fff80718d3db4f3e32849298/quantum/quantum.c#L117)
+        * [`bool pre_process_record_user(uint16_t keycode, keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/27119fa77e8a1b95fff80718d3db4f3e32849298/quantum/quantum.c#L121)
   * [`void process_record(keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/action.c#L254)
     * [`bool process_record_quantum(keyrecord_t *record)`](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/quantum.c#L224)
       * [Map this record to a keycode](https://github.com/qmk/qmk_firmware/blob/325da02e57fe7374e77b82cb00360ba45167e25c/quantum/quantum.c#L225)

quantum/action.c

@@ -30,6 +30,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "wait.h"
 #include "keycode_config.h"
 #include "debug.h"
+#include "quantum.h"
 
 #ifdef BACKLIGHT_ENABLE
 #    include "backlight.h"
@@ -65,10 +66,6 @@ __attribute__((weak)) bool get_retro_tapping(uint16_t keycode, keyrecord_t *reco
 }
 #endif
 
-__attribute__((weak)) bool pre_process_record_quantum(keyrecord_t *record) {
-    return true;
-}
-
 /** \brief Called to execute an action.
  *
  * FIXME: Needs documentation.

quantum/quantum.c

@@ -114,6 +114,14 @@ __attribute__((weak)) void tap_code16(uint16_t code) {
     tap_code16_delay(code, code == KC_CAPS_LOCK ? TAP_HOLD_CAPS_DELAY : TAP_CODE_DELAY);
 }
 
+__attribute__((weak)) bool pre_process_record_kb(uint16_t keycode, keyrecord_t *record) {
+    return pre_process_record_user(keycode, record);
+}
+
+__attribute__((weak)) bool pre_process_record_user(uint16_t keycode, keyrecord_t *record) {
+    return true;
+}
+
 __attribute__((weak)) bool process_action_kb(keyrecord_t *record) {
     return true;
 }
@@ -202,14 +210,13 @@ uint16_t get_event_keycode(keyevent_t event, bool update_layer_cache) {
 
 /* Get keycode, and then process pre tapping functionality */
 bool pre_process_record_quantum(keyrecord_t *record) {
-    if (!(
+    uint16_t keycode = get_record_keycode(record, true);
 #ifdef COMBO_ENABLE
-            process_combo(get_record_keycode(record, true), record) &&
-#endif
-            true)) {
+    if (!(process_combo(keycode, record))) {
         return false;
     }
-    return true; // continue processing
+#endif
+    return pre_process_record_kb(keycode, record);
 }
 
 /* Get keycode, and then call keyboard function */

quantum/quantum.h

@@ -261,6 +261,9 @@ void set_single_persistent_default_layer(uint8_t default_layer);
 
 uint16_t get_record_keycode(keyrecord_t *record, bool update_layer_cache);
 uint16_t get_event_keycode(keyevent_t event, bool update_layer_cache);
+bool     pre_process_record_quantum(keyrecord_t *record);
+bool     pre_process_record_kb(uint16_t keycode, keyrecord_t *record);
+bool     pre_process_record_user(uint16_t keycode, keyrecord_t *record);
 bool     process_action_kb(keyrecord_t *record);
 bool     process_record_kb(uint16_t keycode, keyrecord_t *record);
 bool     process_record_user(uint16_t keycode, keyrecord_t *record);

tests/basic/test_action_layer.cpp

@@ -365,9 +365,10 @@ TEST_F(ActionLayer, LayerTapReleasedBeforeKeypressReleaseWithModifiers) {
     InSequence s;
 
     KeymapKey layer_0_key_0 = KeymapKey{0, 0, 0, LT(1, KC_T)};
+    KeymapKey layer_0_key_1 = KeymapKey{0, 1, 0, KC_X};
     KeymapKey layer_1_key_1 = KeymapKey{1, 1, 0, RALT(KC_9)};
 
-    set_keymap({layer_0_key_0, layer_1_key_1});
+    set_keymap({layer_0_key_0, layer_0_key_1, layer_1_key_1});
 
     /* Press layer tap and wait for tapping term to switch to layer 1 */
     EXPECT_NO_REPORT(driver);