git_graph: Add select first & last actions (#50956)

Remco Smits created 1 month ago

This PR adds support for select first & last actions, as I was missing
them badly :).

**Example**:


https://github.com/user-attachments/assets/709037e6-544c-4891-8f48-7808d556a5a2

Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

Change summary

crates/git_graph/src/git_graph.rs | 23 +++++++++++++++++++----
1 file changed, 19 insertions(+), 4 deletions(-)

Detailed changes

crates/git_graph/src/git_graph.rs

@@ -15,7 +15,7 @@ use gpui::{
     px, uniform_list,
 };
 use language::line_diff;
-use menu::{Cancel, SelectNext, SelectPrevious};
+use menu::{Cancel, SelectFirst, SelectLast, SelectNext, SelectPrevious};
 use project::{
     Project,
     git_store::{
@@ -1171,22 +1171,35 @@ impl GitGraph {
         cx.notify();
     }
 
-    fn select_prev(&mut self, _: &SelectPrevious, _window: &mut Window, cx: &mut Context<Self>) {
+    fn select_first(&mut self, _: &SelectFirst, _window: &mut Window, cx: &mut Context<Self>) {
+        self.select_entry(0, cx);
+    }
+
+    fn select_prev(&mut self, _: &SelectPrevious, window: &mut Window, cx: &mut Context<Self>) {
         if let Some(selected_entry_idx) = &self.selected_entry_idx {
             self.select_entry(selected_entry_idx.saturating_sub(1), cx);
         } else {
-            self.select_entry(0, cx);
+            self.select_first(&SelectFirst, window, cx);
         }
     }
 
     fn select_next(&mut self, _: &SelectNext, window: &mut Window, cx: &mut Context<Self>) {
         if let Some(selected_entry_idx) = &self.selected_entry_idx {
-            self.select_entry(selected_entry_idx.saturating_add(1), cx);
+            self.select_entry(
+                selected_entry_idx
+                    .saturating_add(1)
+                    .min(self.graph_data.commits.len().saturating_sub(1)),
+                cx,
+            );
         } else {
             self.select_prev(&SelectPrevious, window, cx);
         }
     }
 
+    fn select_last(&mut self, _: &SelectLast, _window: &mut Window, cx: &mut Context<Self>) {
+        self.select_entry(self.graph_data.commits.len().saturating_sub(1), cx);
+    }
+
     fn confirm(&mut self, _: &menu::Confirm, window: &mut Window, cx: &mut Context<Self>) {
         self.open_selected_commit_view(window, cx);
     }
@@ -2260,8 +2273,10 @@ impl Render for GitGraph {
                 this.open_selected_commit_view(window, cx);
             }))
             .on_action(cx.listener(Self::cancel))
+            .on_action(cx.listener(Self::select_first))
             .on_action(cx.listener(Self::select_prev))
             .on_action(cx.listener(Self::select_next))
+            .on_action(cx.listener(Self::select_last))
             .on_action(cx.listener(Self::confirm))
             .child(content)
             .children(self.context_menu.as_ref().map(|(menu, position, _)| {