Add user-overridable callback for cancelling UCIS input (#5564)

[qmk_firmware.git] / docs / feature_stenography.md

diff --git a/docs/feature_stenography.md b/docs/feature_stenography.md
index 9fb224b5da0e1da55f4876fab9a8406b94796c4f..0b2c82422b6629a81aec073bc081e873164d2bd2 100644 (file)
--- a/docs/feature_stenography.md
+++ b/docs/feature_stenography.md
@@ -56,6 +56,29 @@ On the display tab click 'Open stroke display'. With Plover disabled you should
 * [Steno Jig](https://joshuagrams.github.io/steno-jig/)
 * More resources at the Plover [Learning Stenography](https://github.com/openstenoproject/plover/wiki/Learning-Stenography) wiki
 
+## Interfacing with the code
+
+The steno code has three interceptible hooks. If you define these functions, they will be called at certain points in processing; if they return true, processing continues, otherwise it's assumed you handled things.
+
+```C
+bool send_steno_chord_user(steno_mode_t mode, uint8_t chord[6]);
+```
+
+This function is called when a chord is about to be sent. Mode will be one of `STENO_MODE_BOLT` or `STENO_MODE_GEMINI`. This represents the actual chord that would be sent via whichever protocol. You can modify the chord provided to alter what gets sent. Remember to return true if you want the regular sending process to happen.
+
+```C
+bool process_steno_user(uint16_t keycode, keyrecord_t *record) { return true; }
+```
+
+This function is called when a keypress has come in, before it is processed. The keycode should be one of `QK_STENO_BOLT`, `QK_STENO_GEMINI`, or one of the `STN_*` key values.
+
+```C
+bool postprocess_steno_user(uint16_t keycode, keyrecord_t *record, steno_mode_t mode, uint8_t chord[6], int8_t pressed);
+```
+
+This function is called after a key has been processed, but before any decision about whether or not to send a chord. If `IS_PRESSED(record->event)` is false, and `pressed` is 0 or 1, the chord will be sent shortly, but has not yet been sent. This is where to put hooks for things like, say, live displays of steno chords or keys.
+
+
 ## Keycode Reference
 
 As defined in `keymap_steno.h`.
@@ -106,3 +129,4 @@ As defined in `keymap_steno.h`.
 |`STN_RES1`||(GeminiPR only)|
 |`STN_RES2`||(GeminiPR only)|
 |`STN_PWR`||(GeminiPR only)|
+