Add Post Processing to process_record (#4892)

* Improve process_record system

Code based on @colinta's

* Rename and better handle functions

* Fix incorrect function call to process_record_user

* Add documentation for post_process_record

* Add both get_event_keycode and get_record_keycode functions

And add some comments about these functions

* Update code format

* Cleanup merge artifacts

2 files changed, 19 insertions, 3 deletions

diff --git a/quantum/quantum.c b/quantum/quantum.c
index 49767819d..d7dbc49dc 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -120,6 +120,14 @@ __attribute__((weak)) bool process_record_kb(uint16_t keycode, keyrecord_t *reco
 
 __attribute__((weak)) bool process_record_user(uint16_t keycode, keyrecord_t *record) { return true; }
 
+__attribute__ ((weak))
+void post_process_record_kb(uint16_t keycode, keyrecord_t *record) {
+  post_process_record_user(keycode, record);
+}
+
+__attribute__ ((weak))
+void post_process_record_user(uint16_t keycode, keyrecord_t *record) {}
+
 void reset_keyboard(void) {
     clear_keyboard();
 #if defined(MIDI_ENABLE) && defined(MIDI_BASIC)
@@ -172,9 +180,15 @@ uint16_t get_event_keycode(keyevent_t event) {
         return keymap_key_to_keycode(layer_switch_get_layer(event.key), event.key);
 }
 
-/* Main keycode processing function. Hands off handling to other functions,
- * then processes internal Quantum keycodes, then processes ACTIONs.
- */
+/* Get keycode, and then call keyboard function */
+void post_process_record_quantum(keyrecord_t *record) {
+  uint16_t keycode = get_record_keycode(record);
+  post_process_record_kb(keycode, record);
+}
+
+/* Core keycode function, hands off handling to other functions,
+    then processes internal quantum keycodes, and then processes
+    ACTIONs.                                                      */
 bool process_record_quantum(keyrecord_t *record) {
     uint16_t keycode = get_record_keycode(record);
 
diff --git a/quantum/quantum.h b/quantum/quantum.h
index 191407fab..4b94ebcc0 100644
--- a/quantum/quantum.h
+++ b/quantum/quantum.h
@@ -257,6 +257,8 @@ uint16_t get_event_keycode(keyevent_t event);
 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);
+void     post_process_record_kb(uint16_t keycode, keyrecord_t *record);
+void     post_process_record_user(uint16_t keycode, keyrecord_t *record);
 
 #ifndef BOOTMAGIC_LITE_COLUMN
 #    define BOOTMAGIC_LITE_COLUMN 0