From ce1b51be8bab049f8f53ce381889357b2c615696 Mon Sep 17 00:00:00 2001
From: Drashna Jaelre <drashna@live.com>
Date: Tue, 16 Jul 2019 01:37:19 -0700
Subject: Allow Combo feature to be enabled/disabled live (#6318)

* Add ability to enable/disable combos

* Update documentation for Combo feature

* Change keycodes for appeasement

* Simplify combo_toggle function

* Update names

* Update combo docs to use tables
---
 quantum/process_keycode/process_combo.c | 43 ++++++++++++++++++++++++++++++++-
 quantum/process_keycode/process_combo.h |  5 ++++
 quantum/quantum_keycodes.h              |  3 +++
 3 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/quantum/process_keycode/process_combo.c b/quantum/process_keycode/process_combo.c
index 2c6c9d0d5f..d3c3b1673c 100644
--- a/quantum/process_keycode/process_combo.c
+++ b/quantum/process_keycode/process_combo.c
@@ -28,6 +28,7 @@ static uint16_t timer = 0;
 static uint8_t current_combo_index = 0;
 static bool drop_buffer = false;
 static bool is_active = false;
+static bool b_combo_enable = true; // defaults to enabled
 
 static uint8_t buffer_size = 0;
 #ifdef COMBO_ALLOW_ACTION_KEYS
@@ -128,6 +129,23 @@ bool process_combo(uint16_t keycode, keyrecord_t *record) {
   drop_buffer = false;
   bool no_combo_keys_pressed = true;
 
+  if (keycode == CMB_ON && record->event.pressed) {
+    combo_enable();
+    return true;
+  }
+
+  if (keycode == CMB_OFF && record->event.pressed) {
+    combo_disable();
+    return true;
+  }
+
+  if (keycode == CMB_TOG && record->event.pressed) {
+    combo_toggle();
+    return true;
+  }
+
+  if (!is_combo_enabled()) { return true; }
+
   for (current_combo_index = 0; current_combo_index < COMBO_COUNT;
        ++current_combo_index) {
     combo_t *combo = &key_combos[current_combo_index];
@@ -166,7 +184,7 @@ bool process_combo(uint16_t keycode, keyrecord_t *record) {
 }
 
 void matrix_scan_combo(void) {
-  if (is_active && timer && timer_elapsed(timer) > COMBO_TERM) {
+  if (b_combo_enable && is_active && timer && timer_elapsed(timer) > COMBO_TERM) {
 
     /* This disables the combo, meaning key events for this
      * combo will be handled by the next processors in the chain
@@ -175,3 +193,26 @@ void matrix_scan_combo(void) {
     dump_key_buffer(true);
   }
 }
+
+void combo_enable(void) {
+    b_combo_enable = true;
+}
+
+void combo_disable(void) {
+    b_combo_enable = is_active = false;
+    timer = 0;
+    dump_key_buffer(true);
+
+}
+
+void combo_toggle(void) {
+    if (b_combo_enable) {
+        combo_disable();
+    } else {
+        combo_enable();
+    }
+}
+
+bool is_combo_enabled(void) {
+    return b_combo_enable;
+}
diff --git a/quantum/process_keycode/process_combo.h b/quantum/process_keycode/process_combo.h
index f06d2d3454..aab2849572 100644
--- a/quantum/process_keycode/process_combo.h
+++ b/quantum/process_keycode/process_combo.h
@@ -58,4 +58,9 @@ bool process_combo(uint16_t keycode, keyrecord_t *record);
 void matrix_scan_combo(void);
 void process_combo_event(uint8_t combo_index, bool pressed);
 
+void combo_enable(void);
+void combo_disable(void);
+void combo_toggle(void);
+bool is_combo_enabled(void);
+
 #endif
diff --git a/quantum/quantum_keycodes.h b/quantum/quantum_keycodes.h
index 779c355efc..207e0a8261 100644
--- a/quantum/quantum_keycodes.h
+++ b/quantum/quantum_keycodes.h
@@ -489,6 +489,9 @@ enum quantum_keycodes {
     // Right control, close paren
     KC_RAPC,
 
+    CMB_ON,
+    CMB_OFF,
+    CMB_TOG,
     // always leave at the end
     SAFE_RANGE
 };
-- 
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