Custom Tapping Term per key (#5009)

* Add customizable tapping terms

* Add Documentation

* Fix function

* Fixes

* It's not a pointer

* Add debugging output

* Update documentation to be at least vaguely accurate

* Use `get_tapping_term(tapping_key.event)` instead

`e` doesn't include column and row information, properly. It registers as 255, regardless of the actual keypress.

However `tapping_key.event` actually gives the correct column and row information.  It appears be the correct structure to use. 

In fact, it looks like the issue is that `e` is actually the "TICK" structure, as defined in keyboard.h

* Use variable tapping term value rather than define

* Silly drashna - tapping_key.event, not event

* add get_event_keycode() function

* Fix typo

Co-Authored-By: drashna <drashna@live.com>

* Remove post_process_record_quantum since it's the wrong PR

* Update quantum/quantum.c

Co-Authored-By: drashna <drashna@live.com>

* Better handle ifdef statement for permissive hold

Since we can't be sure that tapping term is actually 500

* Update quantum.c comments based on feedback

* Clean up get_tapping_term function

Clean up function so that users don't need to call the event function, and instead only check the keycode

* Add ability to run functionality on and off

* Make ifdef's more compact

2 files changed, 19 insertions, 3 deletions

diff --git a/tmk_core/common/action_tapping.c b/tmk_core/common/action_tapping.c
index 8adf013e16..3b67ed152f 100644
--- a/tmk_core/common/action_tapping.c
+++ b/tmk_core/common/action_tapping.c
@@ -18,8 +18,17 @@
 #define IS_TAPPING_PRESSED()    (IS_TAPPING() && tapping_key.event.pressed)
 #define IS_TAPPING_RELEASED()   (IS_TAPPING() && !tapping_key.event.pressed)
 #define IS_TAPPING_KEY(k)       (IS_TAPPING() && KEYEQ(tapping_key.event.key, (k)))
-#define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
 
+__attribute__ ((weak))
+uint16_t get_tapping_term(uint16_t keycode) {
+  return TAPPING_TERM;
+}
+
+#ifdef TAPPING_TERM_PER_KEY
+#define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < get_tapping_term(get_event_keycode(tapping_key.event)))
+#else
+#define WITHIN_TAPPING_TERM(e)  (TIMER_DIFF_16(e.time, tapping_key.event.time) < TAPPING_TERM)
+#endif
 
 static keyrecord_t tapping_key = {};
 static keyrecord_t waiting_buffer[WAITING_BUFFER_SIZE] = {};
@@ -100,12 +109,17 @@ bool process_tapping(keyrecord_t *keyp)
                     // enqueue
                     return false;
                 }
-#if TAPPING_TERM >= 500 || defined PERMISSIVE_HOLD
                 /* Process a key typed within TAPPING_TERM
                  * This can register the key before settlement of tapping,
                  * useful for long TAPPING_TERM but may prevent fast typing.
                  */
-                else if (IS_RELEASED(event) && waiting_buffer_typed(event)) {
+#if defined(TAPPING_TERM_PER_KEY) || (!defined(PER_KEY_TAPPING_TERM) && TAPPING_TERM >= 500) || defined(PERMISSIVE_HOLD)
+#ifdef TAPPING_TERM_PER_KEY
+                else if ( ( get_tapping_term(get_event_keycode(tapping_key.event)) >= 500) && IS_RELEASED(event) && waiting_buffer_typed(event))
+#else
+                else if ( IS_RELEASED(event) && waiting_buffer_typed(event))
+#endif
+                {
                     debug("Tapping: End. No tap. Interfered by typing key\n");
                     process_record(&tapping_key);
                     tapping_key = (keyrecord_t){};
diff --git a/tmk_core/common/action_tapping.h b/tmk_core/common/action_tapping.h
index 2f143ae8b8..1db43a442e 100644
--- a/tmk_core/common/action_tapping.h
+++ b/tmk_core/common/action_tapping.h
@@ -35,6 +35,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
 #ifndef NO_ACTION_TAPPING
+uint16_t get_event_keycode(keyevent_t event);
+uint16_t get_tapping_term(uint16_t keycode);
 void action_tapping_process(keyrecord_t record);
 #endif