Introduce a way to set the double-tap timeout separately

Sometimes one wants a longer timeout, also wants the sticky behaviour on
double-tap, but would like to use a shorter timeout for the sticky behaviour.
The new `double_tap_timeout` property accomplishes just this.

Defaults to using `time_out`, for backwards compatibility.

Fixes #30.

Signed-off-by: Gergely Nagy <algernon@keyboard.io>

README.md

@@ -154,6 +154,18 @@ properties too:
 >
 > Defaults to `true`.
 
+### `.double_tap_time_out`
+
+> Set this property to the number of milliseconds within which a second
+> uninterrupted tap of the same one-shot key will be treated as a sticky-tap.
+> Only takes effect when `.double_tap_sticky` is set.
+>
+>
+> Setting the property to `-1` will make the double-tap timeout use `.time_out`
+> for its calculations.
+>
+> Defaults to -1.
+
 ## Dependencies
 
 * [Kaleidoscope-Ranges](https://github.com/keyboardio/Kaleidoscope-Ranges)

src/Kaleidoscope/OneShot.cpp

@@ -25,6 +25,7 @@ namespace kaleidoscope {
 uint32_t OneShot::start_time_ = 0;
 uint16_t OneShot::time_out = 2500;
 uint16_t OneShot::hold_time_out = 250;
+int16_t OneShot::double_tap_time_out = -1;
 bool OneShot::double_tap_sticky = true;
 OneShot::state_t OneShot::state_;
 OneShot::state_t OneShot::sticky_state_;
@@ -141,9 +142,11 @@ Key OneShot::eventHandlerHook(Key mapped_key, byte row, byte col, uint8_t key_st
       if (keyToggledOn(key_state)) {
         setPressed(idx);
         if (isSameAsPrevious(mapped_key) && double_tap_sticky) {
-          setSticky(idx);
+          if ((millis() - start_time_) <= ((double_tap_time_out == -1) ? time_out : double_tap_time_out)) {
+            setSticky(idx);
 
-          saveAsPrevious(mapped_key);
+            saveAsPrevious(mapped_key);
+          }
         } else {
           start_time_ = millis();
 

src/Kaleidoscope/OneShot.h

@@ -43,6 +43,7 @@ class OneShot : public KaleidoscopePlugin {
     cancel(false);
   }
   static uint16_t time_out;
+  static int16_t double_tap_time_out;
   static uint16_t hold_time_out;
   static bool double_tap_sticky;