Show host in titlebar

Co-Authored-By: Max Brunsfeld <max@zed.dev>

crates/client/src/client.rs

@@ -453,6 +453,10 @@ impl Client {
         self.state.read().status.1.clone()
     }
 
+    pub fn is_connected(&self) -> bool {
+        matches!(&*self.status().borrow(), Status::Connected { .. })
+    }
+
     fn set_status(self: &Arc<Self>, status: Status, cx: &AsyncAppContext) {
         log::info!("set status on client {}: {:?}", self.id, status);
         let mut state = self.state.write();

crates/client/src/user.rs

@@ -595,6 +595,10 @@ impl UserStore {
         self.load_users(proto::FuzzySearchUsers { query }, cx)
     }
 
+    pub fn get_cached_user(&self, user_id: u64) -> Option<Arc<User>> {
+        self.users.get(&user_id).cloned()
+    }
+
     pub fn get_user(
         &mut self,
         user_id: u64,

crates/collab_ui/src/collab_titlebar_item.rs

@@ -215,7 +215,13 @@ impl CollabTitlebarItem {
         let git_style = theme.titlebar.git_menu_button.clone();
         let item_spacing = theme.titlebar.item_spacing;
 
-        let mut ret = Flex::row().with_child(
+        let mut ret = Flex::row();
+
+        if let Some(project_host) = self.collect_project_host(theme.clone(), cx) {
+            ret = ret.with_child(project_host)
+        }
+
+        ret = ret.with_child(
             Stack::new()
                 .with_child(
                     MouseEventHandler::new::<ToggleProjectMenu, _>(0, cx, |mouse_state, cx| {
@@ -283,6 +289,71 @@ impl CollabTitlebarItem {
         ret.into_any()
     }
 
+    fn collect_project_host(
+        &self,
+        theme: Arc<Theme>,
+        cx: &mut ViewContext<Self>,
+    ) -> Option<AnyElement<Self>> {
+        if ActiveCall::global(cx).read(cx).room().is_none() {
+            return None;
+        }
+        let project = self.project.read(cx);
+        let user_store = self.user_store.read(cx);
+
+        if project.is_local() {
+            return None;
+        }
+
+        let Some(host) = project.host() else {
+            return None;
+        };
+        let (Some(host_user), Some(participant_index)) = (
+            user_store.get_cached_user(host.user_id),
+            user_store.participant_indices().get(&host.user_id),
+        ) else {
+            return None;
+        };
+
+        enum ProjectHost {}
+        enum ProjectHostTooltip {}
+
+        let host_style = theme.titlebar.project_host.clone();
+        let selection_style = theme
+            .editor
+            .selection_style_for_room_participant(participant_index.0);
+        let peer_id = host.peer_id.clone();
+
+        Some(
+            MouseEventHandler::new::<ProjectHost, _>(0, cx, |mouse_state, _| {
+                let mut host_style = host_style.style_for(mouse_state).clone();
+                host_style.text.color = selection_style.cursor;
+                Label::new(host_user.github_login.clone(), host_style.text)
+                    .contained()
+                    .with_style(host_style.container)
+                    .aligned()
+                    .left()
+            })
+            .with_cursor_style(CursorStyle::PointingHand)
+            .on_click(MouseButton::Left, move |_, this, cx| {
+                if let Some(workspace) = this.workspace.upgrade(cx) {
+                    if let Some(task) =
+                        workspace.update(cx, |workspace, cx| workspace.follow(peer_id, cx))
+                    {
+                        task.detach_and_log_err(cx);
+                    }
+                }
+            })
+            .with_tooltip::<ProjectHostTooltip>(
+                0,
+                host_user.github_login.clone() + " is sharing this project. Click to follow.",
+                None,
+                theme.tooltip.clone(),
+                cx,
+            )
+            .into_any_named("project-host"),
+        )
+    }
+
     fn window_activation_changed(&mut self, active: bool, cx: &mut ViewContext<Self>) {
         let project = if active {
             Some(self.project.clone())

crates/project/src/project.rs

@@ -975,6 +975,10 @@ impl Project {
         &self.collaborators
     }
 
+    pub fn host(&self) -> Option<&Collaborator> {
+        self.collaborators.values().find(|c| c.replica_id == 0)
+    }
+
     /// Collect all worktrees, including ones that don't appear in the project panel
     pub fn worktrees<'a>(
         &'a self,

crates/theme/src/theme.rs

@@ -131,6 +131,7 @@ pub struct Titlebar {
     pub menu: TitlebarMenu,
     pub project_menu_button: Toggleable<Interactive<ContainedText>>,
     pub git_menu_button: Toggleable<Interactive<ContainedText>>,
+    pub project_host: Interactive<ContainedText>,
     pub item_spacing: f32,
     pub face_pile_spacing: f32,
     pub avatar_ribbon: AvatarRibbon,

crates/workspace/src/workspace.rs

@@ -2608,6 +2608,24 @@ impl Workspace {
             .and_then(|leader_id| self.toggle_follow(leader_id, cx))
     }
 
+    pub fn follow(
+        &mut self,
+        leader_id: PeerId,
+        cx: &mut ViewContext<Self>,
+    ) -> Option<Task<Result<()>>> {
+        for (existing_leader_id, states_by_pane) in &mut self.follower_states_by_leader {
+            if leader_id == *existing_leader_id {
+                for (pane, _) in states_by_pane {
+                    cx.focus(pane);
+                    return None;
+                }
+            }
+        }
+
+        // not currently following, so follow.
+        self.toggle_follow(leader_id, cx)
+    }
+
     pub fn unfollow(
         &mut self,
         pane: &ViewHandle<Pane>,

styles/src/style_tree/titlebar.ts

@@ -1,4 +1,4 @@
-import { icon_button, toggleable_icon_button, toggleable_text_button } from "../component"
+import { icon_button, text_button, toggleable_icon_button, toggleable_text_button } from "../component"
 import { interactive, toggleable } from "../element"
 import { useTheme, with_opacity } from "../theme"
 import { background, border, foreground, text } from "./components"
@@ -191,6 +191,12 @@ export function titlebar(): any {
             color: "variant",
         }),
 
+        project_host: text_button({
+            text_properties: {
+                weight: "bold"
+            }
+        }),
+
         // Collaborators
         leader_avatar: {
             width: avatar_width,