Add is-focused window rule matcher

niri-config/src/lib.rs

@@ -708,11 +708,14 @@ pub struct Match {
     pub title: Option<Regex>,
     #[knuffel(property)]
     pub is_active: Option<bool>,
+    #[knuffel(property)]
+    pub is_focused: Option<bool>,
 }
 
 impl PartialEq for Match {
     fn eq(&self, other: &Self) -> bool {
         self.is_active == other.is_active
+            && self.is_focused == other.is_focused
             && self.app_id.as_ref().map(Regex::as_str) == other.app_id.as_ref().map(Regex::as_str)
             && self.title.as_ref().map(Regex::as_str) == other.title.as_ref().map(Regex::as_str)
     }
@@ -1766,7 +1769,7 @@ mod tests {
             window-rule {
                 match app-id=".*alacritty"
                 exclude title="~"
-                exclude is-active=true
+                exclude is-active=true is-focused=false
 
                 open-on-output "eDP-1"
                 open-maximized true
@@ -1953,17 +1956,20 @@ mod tests {
                         app_id: Some(Regex::new(".*alacritty").unwrap()),
                         title: None,
                         is_active: None,
+                        is_focused: None,
                     }],
                     excludes: vec![
                         Match {
                             app_id: None,
                             title: Some(Regex::new("~").unwrap()),
                             is_active: None,
+                            is_focused: None,
                         },
                         Match {
                             app_id: None,
                             title: None,
                             is_active: Some(true),
+                            is_focused: Some(false),
                         },
                     ],
                     open_on_output: Some("eDP-1".to_owned()),

resources/default-config.kdl

@@ -368,6 +368,13 @@ animations {
     // (same as when it uses the active border color).
     match is-active=true
 
+    // Another way to match is by whether the window has keyboard focus.
+    // This is different from is-active: every workspace on a monitor
+    // has one active window, but only one window can have a keyboard
+    // focus. Also, the keyboard focus can go to a layer-shell surface,
+    // then no window will have the keyboard focus.
+    match is-focused=true
+
     // Here are the properties that you can set on a window rule.
     // These properties apply once, when a window first opens.
 

src/niri.rs

@@ -706,6 +706,24 @@ impl State {
                 focus
             );
 
+            // Tell the windows their new focus state for window rule purposes.
+            if let KeyboardFocus::Layout {
+                surface: Some(surface),
+            } = &self.niri.keyboard_focus
+            {
+                if let Some((mapped, _)) = self.niri.layout.find_window_and_output_mut(surface) {
+                    mapped.set_is_focused(false);
+                }
+            }
+            if let KeyboardFocus::Layout {
+                surface: Some(surface),
+            } = &focus
+            {
+                if let Some((mapped, _)) = self.niri.layout.find_window_and_output_mut(surface) {
+                    mapped.set_is_focused(true);
+                }
+            }
+
             if let Some(grab) = self.niri.popup_grab.as_mut() {
                 if Some(&grab.root) != focus.surface() {
                     trace!(

src/window/mapped.rs

@@ -29,6 +29,9 @@ pub struct Mapped {
     /// This is not used in all cases; for example, app ID and title changes recompute the rules
     /// immediately, rather than setting this flag.
     need_to_recompute_rules: bool,
+
+    /// Whether this window has the keyboard focus.
+    is_focused: bool,
 }
 
 impl Mapped {
@@ -37,6 +40,7 @@ impl Mapped {
             window,
             rules,
             need_to_recompute_rules: false,
+            is_focused: false,
         }
     }
 
@@ -64,6 +68,19 @@ impl Mapped {
 
         self.recompute_window_rules(rules)
     }
+
+    pub fn is_focused(&self) -> bool {
+        self.is_focused
+    }
+
+    pub fn set_is_focused(&mut self, is_focused: bool) {
+        if self.is_focused == is_focused {
+            return;
+        }
+
+        self.is_focused = is_focused;
+        self.need_to_recompute_rules = true;
+    }
 }
 
 impl LayoutElement for Mapped {

src/window/mod.rs

@@ -61,6 +61,13 @@ impl<'a> WindowRef<'a> {
             WindowRef::Mapped(mapped) => mapped.toplevel(),
         }
     }
+
+    pub fn is_focused(self) -> bool {
+        match self {
+            WindowRef::Unmapped(_) => false,
+            WindowRef::Mapped(mapped) => mapped.is_focused(),
+        }
+    }
 }
 
 impl ResolvedWindowRules {
@@ -100,13 +107,13 @@ impl ResolvedWindowRules {
             let mut open_on_output = None;
 
             for rule in rules {
-                if !(rule.matches.is_empty()
-                    || rule.matches.iter().any(|m| window_matches(&role, m)))
-                {
+                let matches = |m| window_matches(window, &role, m);
+
+                if !(rule.matches.is_empty() || rule.matches.iter().any(matches)) {
                     continue;
                 }
 
-                if rule.excludes.iter().any(|m| window_matches(&role, m)) {
+                if rule.excludes.iter().any(matches) {
                     continue;
                 }
 
@@ -155,10 +162,16 @@ impl ResolvedWindowRules {
     }
 }
 
-fn window_matches(role: &XdgToplevelSurfaceRoleAttributes, m: &Match) -> bool {
+fn window_matches(window: WindowRef, role: &XdgToplevelSurfaceRoleAttributes, m: &Match) -> bool {
     // Must be ensured by the caller.
     let server_pending = role.server_pending.as_ref().unwrap();
 
+    if let Some(is_focused) = m.is_focused {
+        if window.is_focused() != is_focused {
+            return false;
+        }
+    }
+
     if let Some(is_active) = m.is_active {
         // Our "is-active" definition corresponds to the window having a pending Activated state.
         let pending_activated = server_pending