.

crates/workspace/src/views/repo_detail/mod.rs

@@ -79,6 +79,8 @@ pub struct RepoDetailView {
     /// A clone/fetch is in flight.
     loading: bool,
     error: Option<SharedString>,
+    /// Commit HEAD currently points to, shown in the header button.
+    head_commit: Option<FileCommit>,
     /// Branch selector (header): local branches, searchable.
     branch_select: Entity<ComboboxState<SearchableVec<SharedString>>>,
     /// Tag selector (header): tags, searchable.
@@ -164,6 +166,7 @@ impl RepoDetailView {
             item_sizes: Rc::new(Vec::new()),
             loading: true,
             error: None,
+            head_commit: None,
             branch_select,
             tag_select,
             switching_ref: false,
@@ -203,6 +206,7 @@ impl RepoDetailView {
                 ),
                 None => (Vec::new(), Vec::new(), None),
             };
+            let head_commit = signed_git::head_commit(&repo).unwrap_or(None);
 
             Ok::<_, Error>((
                 entries,
@@ -212,6 +216,7 @@ impl RepoDetailView {
                 branches,
                 tags,
                 current_branch,
+                head_commit,
             ))
         });
 
@@ -228,8 +233,10 @@ impl RepoDetailView {
                         branches,
                         tags,
                         current_branch,
+                        head_commit,
                     )) => {
                         this.worktree = Some(worktree);
+                        this.head_commit = head_commit;
                         this.tree_state.update(cx, |state, cx| {
                             state.set_items(build_tree_items(&entries), cx);
                         });
@@ -259,7 +266,7 @@ impl RepoDetailView {
                             }
                         }
                     }
-                    Ok((_, _, _, None, _, _, _)) => {
+                    Ok((_, _, _, None, _, _, _, _)) => {
                         this.error = Some("Repository has no worktree".into());
                     }
                     Err(error) => {
@@ -589,6 +596,7 @@ impl RepoDetailView {
                 this.switching_ref = false;
                 match result {
                     Ok(snapshot) => {
+                        this.head_commit = snapshot.head_commit;
                         // Rebuild the tree from scratch: entries of the
                         // previous branch are gone, and with them the
                         // expansion state.
@@ -619,6 +627,7 @@ impl RepoDetailView {
                     }
                     Err(error) => {
                         this.error = Some(error.to_string().into());
+                        this.head_commit = None;
                         // The tree may show files that no longer exist.
                         this.tree_state.update(cx, |state, cx| {
                             state.set_items(Vec::new(), cx);
@@ -870,6 +879,34 @@ impl Render for RepoDetailView {
                                                     )
                                                 }),
                                         ),
+                                    )
+                                    .child(
+                                        Button::new("enc")
+                                            .secondary()
+                                            .when_some(self.head_commit.as_ref(), |this, commit| {
+                                                this.child(
+                                                    div()
+                                                        .text_xs()
+                                                        .text_color(cx.theme().muted_foreground)
+                                                        .child(SharedString::from(&commit.id)),
+                                                )
+                                                .child(
+                                                    div()
+                                                        .max_w(px(200.))
+                                                        .overflow_hidden()
+                                                        .text_ellipsis()
+                                                        .whitespace_nowrap()
+                                                        .text_xs()
+                                                        .child(SharedString::from(&commit.summary)),
+                                                )
+                                            })
+                                            .tooltip(
+                                                self.head_commit
+                                                    .as_ref()
+                                                    .map_or_else(SharedString::default, |commit| {
+                                                        commit.summary.clone().into()
+                                                    }),
+                                            ),
                                     ),
                             ),
                     ),