git: Implement a basic repository selector (#23419)

This PR adds a rough-and-ready picker for selecting which of the
project's repositories the git panel should display.

Release Notes:

- N/A

---------

Co-authored-by: Nate Butler <iamnbutler@gmail.com>
Co-authored-by: Nate <nate@zed.dev>

crates/title_bar/Cargo.toml

@@ -47,6 +47,7 @@ util.workspace = true
 telemetry.workspace = true
 workspace.workspace = true
 zed_actions.workspace = true
+git_ui.workspace = true
 
 [target.'cfg(windows)'.dependencies]
 windows.workspace = true

crates/title_bar/src/title_bar.rs

@@ -16,6 +16,8 @@ use auto_update::AutoUpdateStatus;
 use call::ActiveCall;
 use client::{Client, UserStore};
 use feature_flags::{FeatureFlagAppExt, ZedPro};
+use git_ui::repository_selector::RepositorySelector;
+use git_ui::repository_selector::RepositorySelectorPopoverMenu;
 use gpui::{
     actions, div, px, Action, AnyElement, AppContext, Decorations, Element, InteractiveElement,
     Interactivity, IntoElement, Model, MouseButton, ParentElement, Render, Stateful,
@@ -98,6 +100,7 @@ pub struct TitleBar {
     platform_style: PlatformStyle,
     content: Stateful<Div>,
     children: SmallVec<[AnyElement; 2]>,
+    repository_selector: View<RepositorySelector>,
     project: Model<Project>,
     user_store: Model<UserStore>,
     client: Arc<Client>,
@@ -181,6 +184,7 @@ impl Render for TitleBar {
                                         title_bar
                                             .children(self.render_project_host(cx))
                                             .child(self.render_project_name(cx))
+                                            .children(self.render_current_repository(cx))
                                             .children(self.render_project_branch(cx))
                                     })
                             })
@@ -290,6 +294,7 @@ impl TitleBar {
             content: div().id(id.into()),
             children: SmallVec::new(),
             application_menu,
+            repository_selector: cx.new_view(|cx| RepositorySelector::new(project.clone(), cx)),
             workspace: workspace.weak_handle(),
             should_move: false,
             project,
@@ -474,6 +479,39 @@ impl TitleBar {
             }))
     }
 
+    // NOTE: Not sure we want to keep this in the titlebar, but for while we are working on Git it is helpful in the short term
+    pub fn render_current_repository(
+        &self,
+        cx: &mut ViewContext<Self>,
+    ) -> Option<impl IntoElement> {
+        // TODO what to render if no active repository?
+        let active_repository = self.project.read(cx).active_repository(cx)?;
+        let display_name = active_repository.display_name(self.project.read(cx), cx);
+        Some(RepositorySelectorPopoverMenu::new(
+            self.repository_selector.clone(),
+            ButtonLike::new("active-repository")
+                .style(ButtonStyle::Subtle)
+                .child(
+                    h_flex().w_full().gap_0p5().child(
+                        div()
+                            .overflow_x_hidden()
+                            .flex_grow()
+                            .whitespace_nowrap()
+                            .child(
+                                h_flex()
+                                    .gap_1()
+                                    .child(
+                                        Label::new(display_name)
+                                            .size(LabelSize::Small)
+                                            .color(Color::Muted),
+                                    )
+                                    .into_any_element(),
+                            ),
+                    ),
+                ),
+        ))
+    }
+
     pub fn render_project_branch(&self, cx: &mut ViewContext<Self>) -> Option<impl IntoElement> {
         let entry = {
             let mut names_and_branches =