Keymap introspection for combos. (#19670)

docs/config_options.md

@@ -186,8 +186,6 @@ If you define these options you will enable the associated feature, which may in
   * how long before oneshot times out
 * `#define ONESHOT_TAP_TOGGLE 2`
   * how many taps before oneshot toggle is triggered
-* `#define COMBO_COUNT 2`
-  * Set this to the number of combos that you're using in the [Combo](feature_combo.md) feature. Or leave it undefined and programmatically set the count.
 * `#define COMBO_TERM 200`
   * how long for the Combo keys to be detected. Defaults to `TAPPING_TERM` if not defined.
 * `#define COMBO_MUST_HOLD_MODS`

docs/feature_combo.md

@@ -4,15 +4,12 @@ The Combo feature is a chording type solution for adding custom actions. It lets
 
 To enable this feature, you need to add `COMBO_ENABLE = yes` to your `rules.mk`.
 
-Additionally, in your `config.h`, you'll need to specify the number of combos that you'll be using, by adding `#define COMBO_COUNT 1` (replacing 1 with the number that you're using). It is also possible to not define this and instead set the variable `COMBO_LEN` yourself. There's a trick where we don't need to think about this variable at all. More on this later.
-
-
 Then, in your `keymap.c` file, you'll need to define a sequence of keys, terminated with `COMBO_END`, and a structure to list the combination of keys, and its resulting action.
 
 ```c
 const uint16_t PROGMEM test_combo1[] = {KC_A, KC_B, COMBO_END};
 const uint16_t PROGMEM test_combo2[] = {KC_C, KC_D, COMBO_END};
-combo_t key_combos[COMBO_COUNT] = {
+combo_t key_combos[] = {
     COMBO(test_combo1, KC_ESC),
     COMBO(test_combo2, LCTL(KC_Z)), // keycodes with modifiers are possible too!
 };
@@ -33,7 +30,7 @@ It is possible to overlap combos. Before, with the example below both combos wou
 ```c
 const uint16_t PROGMEM test_combo1[] = {LSFT_T(KC_A), LT(1, KC_B), COMBO_END};
 const uint16_t PROGMEM test_combo2[] = {LSFT_T(KC_A), LT(1, KC_B), KC_C, COMBO_END};
-combo_t key_combos[COMBO_COUNT] = {
+combo_t key_combos[] = {
     COMBO(test_combo1, KC_ESC)
     COMBO(test_combo2, KC_TAB)
 };
@@ -41,17 +38,15 @@ combo_t key_combos[COMBO_COUNT] = {
 
 ## Examples
 
-A long list of combos can be defined in an `enum` list that ends with `COMBO_LENGTH` and you can leave `COMBO_COUNT` undefined:
+A long list of combos can be defined in an `enum` list:
 
 ```c
 enum combos {
   AB_ESC,
   JK_TAB,
   QW_SFT,
-  SD_LAYER,
-  COMBO_LENGTH
+  SD_LAYER
 };
-uint16_t COMBO_LEN = COMBO_LENGTH; // remove the COMBO_COUNT define and use this instead!
 
 const uint16_t PROGMEM ab_combo[] = {KC_A, KC_B, COMBO_END};
 const uint16_t PROGMEM jk_combo[] = {KC_J, KC_K, COMBO_END};
@@ -72,9 +67,7 @@ For a more complicated implementation, you can use the `process_combo_event` fun
 enum combo_events {
   EM_EMAIL,
   BSPC_LSFT_CLEAR,
-  COMBO_LENGTH
 };
-uint16_t COMBO_LEN = COMBO_LENGTH; // remove the COMBO_COUNT define and use this instead!
 
 const uint16_t PROGMEM email_combo[] = {KC_E, KC_M, COMBO_END};
 const uint16_t PROGMEM clear_line_combo[] = {KC_BSPC, KC_LSFT, COMBO_END};
@@ -259,18 +252,6 @@ bool combo_should_trigger(uint16_t combo_index, combo_t *combo, uint16_t keycode
 }
 ```
 
-### Variable Length Combos
-If you leave `COMBO_COUNT` undefined in `config.h`, it allows you to programmatically declare the size of the Combo data structure and avoid updating `COMBO_COUNT`. Instead a variable called `COMBO_LEN` has to be set. It can be set with something similar to the following in `keymap.c`: `uint16_t COMBO_LEN = ARRAY_SIZE(key_combos);` or by adding `COMBO_LENGTH` as the *last* entry in the combo enum and then `uint16_t COMBO_LEN = COMBO_LENGTH;` as such:
-```c
-enum myCombos {
-    ...,
-    COMBO_LENGTH
-};
-uint16_t COMBO_LEN = COMBO_LENGTH;
-```
-Regardless of the method used to declare `COMBO_LEN`, this also requires to convert the `combo_t key_combos[COMBO_COUNT] = {...};` line to `combo_t key_combos[] = {...};`.
-
-
 ### Combo timer
 
 Normally, the timer is started on the first key press and then reset on every subsequent key press within the `COMBO_TERM`.
@@ -300,10 +281,8 @@ Here's an example where a combo resolves to two modifiers, and on key releases t
 
 ```c
 enum combos {
-  AB_MODS,
-  COMBO_LENGTH
+  AB_MODS
 };
-uint16_t COMBO_LEN = COMBO_LENGTH;
 
 const uint16_t PROGMEM ab_combo[] = {KC_A, KC_B, COMBO_END};
 
@@ -415,6 +394,4 @@ SUBS(TH_THE,   "the",    KC_T, KC_H) // SUBS uses SEND_STRING to output the give
 ...
 ```
 
-Now, you can update only one place to add or alter combos. You don't even need to remember to update the `COMBO_COUNT` or the `COMBO_LEN` variables at all. Everything is taken care of. Magic!
-
 For small to huge ready made dictionaries of combos, you can check out http://combos.gboards.ca/.

docs/ja/config_options.md

@@ -176,8 +176,6 @@ QMK での全ての利用可能な設定にはデフォルトがあります。
   * ワンショットがタイムアウトするまでの時間
 * `#define ONESHOT_TAP_TOGGLE 2`
   * ワンショットトグルが引き起こされるまでのタップ数
-* `#define COMBO_COUNT 2`
-  * [コンボ](ja/feature_combo.md)機能で使っているコンボの数にこれを設定します。
 * `#define COMBO_TERM 200`
   * コンボキーが検出されるまでの時間。定義されていない場合は、デフォルトは `TAPPING_TERM` です。
 * `#define TAP_CODE_DELAY 100`

docs/ja/feature_combo.md

@@ -18,7 +18,7 @@
 
 ```c
 const uint16_t PROGMEM test_combo[] = {KC_A, KC_B, COMBO_END};
-combo_t key_combos[COMBO_COUNT] = {COMBO(test_combo, KC_ESC)};
+combo_t key_combos[] = {COMBO(test_combo, KC_ESC)};
 ```
 
 これは、A と B のキーを押した場合に、"Escape" を送信します。
@@ -38,7 +38,7 @@ enum combos {
 const uint16_t PROGMEM ab_combo[] = {KC_A, KC_B, COMBO_END};
 const uint16_t PROGMEM jk_combo[] = {KC_J, KC_K, COMBO_END};
 
-combo_t key_combos[COMBO_COUNT] = {
+combo_t key_combos[] = {
   [AB_ESC] = COMBO(ab_combo, KC_ESC),
   [JK_TAB] = COMBO(jk_combo, KC_TAB)
 };
@@ -55,7 +55,7 @@ enum combo_events {
 const uint16_t PROGMEM copy_combo[] = {KC_Z, KC_C, COMBO_END};
 const uint16_t PROGMEM paste_combo[] = {KC_X, KC_V, COMBO_END};
 
-combo_t key_combos[COMBO_COUNT] = {
+combo_t key_combos[] = {
   [ZC_COPY] = COMBO_ACTION(copy_combo),
   [XV_PASTE] = COMBO_ACTION(paste_combo),
 };