feat(vkeys): add hold-for-duration action

cfg_samples/kanata.kbd

@@ -1151,6 +1151,7 @@ If you need help, please feel welcome to ask in the GitHub discussions.
   pal (on-press-fakekey pal tap)
   ral (on-press-fakekey ral tap)
   rdl (on-idle-fakekey ral tap 1000)
+  hfd (hold-for-duration 1000 met)
 
   ;; Test of on-press-fakekey and on-release-fakekey in a macro
   t1 (macro-release-cancel @fsp 5 a b c @fsr 5 c b a)

docs/config.adoc

@@ -3225,9 +3225,13 @@ Virtual keys can be activated via special actions:
 Activate a virtual key action when pressing the associated input key.
 * `(on-release  <action> <virtual key name>)` or `on↑`:
 Activate a virtual key action when releasing the associated input key.
-* `(on-idle <milliseconds> <action> <virtual key name>)`:
+* `(on-idle <idle time> <action> <virtual key name>)`:
 Activate a virtual key action when kanata has been idle
 for at least `idle time` milliseconds.
+* `(hold-for-duration <hold time> <virtual key name>`):
+Press a virtual key for `hold time` milliseconds.
+If `hold-for-duration` retriggered on a virtual key before release,
+the time will be reset with no additional press/release events.
 
 The `<action>` parameter can be one of:
 
@@ -3284,10 +3288,11 @@ will not yet be counting even if you no longer have any keyboard keys pressed.
   mac (on-press tap-vkey vkmacro)
 
   isf (on-idle 1000 tap-vkey sft)
+  hfd (hold-for-duration 1000 met)
 )
 
 (deflayer use-virtual-keys
-  @psf @rsf @tal @mac a s d f @isf
+  @psf @rsf @tal @mac a s d f @isf @hfd
 )
 ----
 

parser/src/cfg/fake_key.rs

@@ -263,3 +263,22 @@ pub(crate) fn parse_on_idle(ac_params: &[SExpr], s: &ParserState) -> Result<&'st
         }),
     )))))
 }
+
+pub(crate) fn parse_hold_for_duration(
+    ac_params: &[SExpr],
+    s: &ParserState,
+) -> Result<&'static KanataAction> {
+    const ERR_MSG: &str = "hold-for-duration expects two parameters: <hold-duration> <key-name>";
+    if ac_params.len() != 2 {
+        bail!("{ERR_MSG}");
+    }
+    let hold_duration = parse_non_zero_u16(&ac_params[0], s, "hold-duration")?;
+    let coord = parse_vkey_coord(&ac_params[1], s)?;
+
+    Ok(s.a.sref(Action::Custom(s.a.sref(s.a.sref_slice(
+        CustomAction::FakeKeyHoldForDuration(FakeKeyHoldForDuration {
+            coord,
+            hold_duration,
+        }),
+    )))))
+}

parser/src/cfg/list_actions.rs

@@ -116,6 +116,7 @@ pub const ON_PRESS_A: &str = "on↓";
 pub const ON_RELEASE: &str = "on-release";
 pub const ON_RELEASE_A: &str = "on↑";
 pub const ON_IDLE: &str = "on-idle";
+pub const HOLD_FOR_DURATION: &str = "hold-for-duration";
 
 pub fn is_list_action(ac: &str) -> bool {
     const LIST_ACTIONS: &[&str] = &[
@@ -227,6 +228,7 @@ pub fn is_list_action(ac: &str) -> bool {
         ON_RELEASE,
         ON_RELEASE_A,
         ON_IDLE,
+        HOLD_FOR_DURATION,
         MACRO_CANCEL_ON_NEXT_PRESS,
         MACRO_REPEAT_CANCEL_ON_NEXT_PRESS,
         MACRO_CANCEL_ON_NEXT_PRESS_CANCEL_ON_RELEASE,

parser/src/cfg/mod.rs

@@ -1784,6 +1784,7 @@ fn parse_action_list(ac: &[SExpr], s: &ParserState) -> Result<&'static KanataAct
         ON_PRESS | ON_PRESS_A => parse_on_press(&ac[1..], s),
         ON_RELEASE | ON_RELEASE_A => parse_on_release(&ac[1..], s),
         ON_IDLE => parse_on_idle(&ac[1..], s),
+        HOLD_FOR_DURATION => parse_hold_for_duration(&ac[1..], s),
         MWHEEL_UP | MWHEEL_UP_A => parse_mwheel(&ac[1..], MWheelDirection::Up, s),
         MWHEEL_DOWN | MWHEEL_DOWN_A => parse_mwheel(&ac[1..], MWheelDirection::Down, s),
         MWHEEL_LEFT | MWHEEL_LEFT_A => parse_mwheel(&ac[1..], MWheelDirection::Left, s),

parser/src/custom_action.rs

@@ -27,6 +27,7 @@ pub enum CustomAction {
         action: FakeKeyAction,
     },
     FakeKeyOnIdle(FakeKeyOnIdle),
+    FakeKeyHoldForDuration(FakeKeyHoldForDuration),
     Delay(u16),
     DelayOnRelease(u16),
     MWheel {
@@ -127,6 +128,14 @@ pub struct FakeKeyOnIdle {
     pub idle_duration: u16,
 }
 
+/// Information for an action that presses a fake key / vkey that becomes released on a
+/// renewable-when-reactivated deadline.
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+pub struct FakeKeyHoldForDuration {
+    pub coord: Coord,
+    pub hold_duration: u16,
+}
+
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum MWheelDirection {
     Up,

src/kanata/mod.rs

@@ -188,6 +188,10 @@ pub struct Kanata {
     pub device_detect_mode: DeviceDetectMode,
     /// Fake key actions that are waiting for a certain duration of keyboard idling.
     pub waiting_for_idle: HashSet<FakeKeyOnIdle>,
+    /// Fake key actions that are being held and are pending release.
+    /// The key is the coordinate and the value is the number of ticks until release should be
+    /// done.
+    pub vkeys_pending_release: HashMap<Coord, u16>,
     /// Number of ticks since kanata was idle.
     pub ticks_since_idle: u16,
     /// If a mousemove action is active and another mousemove action is activated,
@@ -411,6 +415,7 @@ impl Kanata {
                 .linux_device_detect_mode
                 .expect("parser should default to some"),
             waiting_for_idle: HashSet::default(),
+            vkeys_pending_release: HashMap::default(),
             ticks_since_idle: 0,
             movemouse_buffer: None,
             unmodded_keys: vec![],
@@ -541,6 +546,7 @@ impl Kanata {
                 .linux_device_detect_mode
                 .expect("parser should default to some"),
             waiting_for_idle: HashSet::default(),
+            vkeys_pending_release: HashMap::default(),
             ticks_since_idle: 0,
             movemouse_buffer: None,
             unmodded_keys: vec![],
@@ -796,6 +802,23 @@ impl Kanata {
         Ok(())
     }
 
+    fn tick_held_vkeys(&mut self) {
+        if self.vkeys_pending_release.is_empty() {
+            return;
+        }
+        let layout = self.layout.bm();
+        self.vkeys_pending_release.retain(|coord, deadline| {
+            *deadline = deadline.saturating_sub(1);
+            match deadline {
+                0 => {
+                    layout.event(Event::Release(coord.x, coord.y));
+                    false
+                }
+                _ => true,
+            }
+        });
+    }
+
     fn tick_states(&mut self, _tx: &Option<Sender<ServerMessage>>) -> Result<()> {
         self.live_reload_requested |= self.handle_keystate_changes(_tx)?;
         self.handle_scrolling()?;
@@ -807,6 +830,7 @@ impl Kanata {
         zippy_tick(self.caps_word.is_some());
         self.prev_keys.clear();
         self.prev_keys.append(&mut self.cur_keys);
+        self.tick_held_vkeys();
         #[cfg(feature = "simulated_output")]
         {
             self.kbd_out.tick();
@@ -1557,6 +1581,17 @@ impl Kanata {
                             self.ticks_since_idle = 0;
                             self.waiting_for_idle.insert(*fkd);
                         }
+                        CustomAction::FakeKeyHoldForDuration(fk_hfd) => {
+                            let x = fk_hfd.coord.x;
+                            let y = fk_hfd.coord.y;
+                            let duration = fk_hfd.hold_duration;
+                            self.vkeys_pending_release.entry(fk_hfd.coord)
+                                .and_modify(|d| *d = duration)
+                                .or_insert_with(|| {
+                                    layout.event(Event::Press(x, y));
+                                    duration
+                                });
+                        }
                         CustomAction::FakeKeyOnRelease { .. }
                         | CustomAction::DelayOnRelease(_)
                         | CustomAction::Unmodded { .. }
@@ -2072,6 +2107,7 @@ impl Kanata {
             && self.move_mouse_state_horizontal.is_none()
             && self.dynamic_macro_replay_state.is_none()
             && self.caps_word.is_none()
+            && self.vkeys_pending_release.is_empty()
             && !self.layout.b().states.iter().any(|s| {
                 matches!(s, State::SeqCustomPending(_) | State::SeqCustomActive(_))
                     || (pressed_keys_means_not_idle && matches!(s, State::NormalKey { .. }))

src/tests/sim_tests/mod.rs

@@ -25,6 +25,7 @@ mod switch_sim_tests;
 mod unicode_sim_tests;
 mod unmod_sim_tests;
 mod use_defsrc_sim_tests;
+mod vkey_sim_tests;
 mod zippychord_sim_tests;
 
 fn simulate<S: AsRef<str>>(cfg: S, sim: S) -> String {

src/tests/sim_tests/vkey_sim_tests.rs

@@ -0,0 +1,25 @@
+use super::*;
+
+const CFG: &str = r"
+ (defsrc a b c)
+ (defvirtualkeys lmet lmet)
+ (defalias hm (hold-for-duration 50 lmet))
+ (deflayer base
+    (multi @hm (macro-repeat 40 @hm))
+    (multi 1 @hm)
+    (release-key lmet)
+ )
+";
+
+#[test]
+fn hold_for_duration() {
+    let result = simulate(CFG, "d:a t:200 u:a t:60").to_ascii();
+    assert_eq!("t:1ms dn:LGui t:258ms up:LGui", result);
+    let result = simulate(CFG, "d:a u:a t:25 d:c u:c t:25").to_ascii();
+    assert_eq!("t:2ms dn:LGui t:23ms up:LGui", result);
+    let result = simulate(CFG, "d:a u:a t:25 d:b u:b t:25 d:b u:b t:60").to_ascii();
+    assert_eq!(
+        "t:2ms dn:LGui t:23ms dn:Kb1 t:1ms up:Kb1 t:24ms dn:Kb1 t:1ms up:Kb1 t:49ms up:LGui",
+        result
+    );
+}