add repository history and commit diff views

crates/signed_app/src/app.rs

@@ -4,7 +4,7 @@ use gpui::{
 };
 use gpui_native_kit::icons::IconRole;
 use gpui_native_kit::layout::dock::{Dock, DockState};
-use gpui_native_kit::layout::shell::{LayoutState, Shell};
+use gpui_native_kit::layout::shell::{LayoutState, Shell, SidebarToggles};
 use gpui_native_kit::theme::{ActiveTheme as _, ThemeVariant, follow_system, set_mode_override};
 use gpui_native_kit::toast::Toast;
 use settings::{AppearanceMode, Settings, SettingsStore};
@@ -24,8 +24,12 @@ pub struct AppRoot {
 
 impl AppRoot {
     pub fn new(window: &mut Window, cx: &mut Context<Self>) -> Self {
-        let layout = LayoutState::new(cx);
         let dock = DockState::new(cx);
+        let layout = LayoutState::new(cx);
+
+        layout.update(cx, |layout, cx| {
+            layout.set_sidebar_toggles(SidebarToggles::Hidden, cx);
+        });
 
         dock.update(cx, |dock, cx| {
             dock.register_panel("welcome", |_, cx| {
@@ -42,8 +46,11 @@ impl AppRoot {
         let dialogs = cx.new(DialogHost::new);
         DialogHost::set_global(dialogs.clone(), cx);
 
-        let mut subscriptions = Vec::new();
         let backend = Backend::global(cx);
+        let settings = SettingsStore::global(cx);
+
+        let mut subscriptions = Vec::new();
+
         subscriptions.push(
             cx.subscribe(&backend, |this, _backend, event, cx| match event {
                 BackendEvent::PassphraseRequired => dialogs::passphrase::open(cx),
@@ -56,15 +63,13 @@ impl AppRoot {
             }),
         );
 
-        let settings = SettingsStore::global(cx);
         subscriptions.push(cx.observe(&settings, |_this, store, cx| {
             let settings = store.read(cx).settings().clone();
             apply_appearance(&settings, cx);
         }));
 
-        window.defer(cx, |_window, cx| {
-            let required = Backend::global(cx).read(cx).passphrase_required();
-            if required {
+        window.defer(cx, move |_window, cx| {
+            if backend.read(cx).passphrase_required() {
                 dialogs::passphrase::open(cx);
             }
         });

crates/signed_app/src/views/repo/commit_diff.rs

@@ -0,0 +1,661 @@
+use std::collections::HashSet;
+use std::path::PathBuf;
+
+use gpui::prelude::FluentBuilder as _;
+use gpui::{
+    AnyElement, App, AppContext as _, Axis, Context, Entity, IntoElement, ParentElement as _,
+    Render, ScrollStrategy, SharedString, Styled as _, Task, UniformListScrollHandle, Window, div,
+    px, uniform_list,
+};
+use gpui_native_kit::badge::{Badge, BadgeVariant};
+use gpui_native_kit::clipboard::ClipboardButton;
+use gpui_native_kit::common::{h_flex, v_flex};
+use gpui_native_kit::data::tree::{Tree, TreeItem};
+use gpui_native_kit::empty_state::EmptyState;
+use gpui_native_kit::icons::{Icon, IconRole};
+use gpui_native_kit::layout::dock::Panel;
+use gpui_native_kit::layout::resizable::{Resizable, ResizableState};
+use gpui_native_kit::scrollbar::Scrollbar;
+use gpui_native_kit::spinner::Spinner;
+use gpui_native_kit::theme::ActiveTheme as _;
+use metadata::ProfileDirectory;
+use signed_git::{
+    CommitDiff, DiffHunk, DiffLine, DiffLineKind, DiffStatus, FileCommit, FileDiff, Repo,
+};
+use signed_state::RepoStore;
+use utils::relative_time_secs;
+
+use crate::views::tree::{TreeRow, build_tree_items, collect_expanded, flatten};
+
+pub struct DiffPane {
+    diff: Option<CommitDiff>,
+    seeds: Vec<crate::views::tree::TreeItemSeed>,
+    expanded: HashSet<String>,
+    rows: Vec<TreeRow>,
+    selected_file: Option<SharedString>,
+    selected_index: Option<usize>,
+    /// Rows of the selected file's diff, hunk headers and lines.
+    diff_rows: Vec<DiffRow>,
+    scroll_handle: UniformListScrollHandle,
+    split: Entity<ResizableState>,
+}
+
+impl DiffPane {
+    pub fn new(cx: &mut Context<Self>) -> Self {
+        Self {
+            diff: None,
+            seeds: Vec::new(),
+            expanded: HashSet::new(),
+            rows: Vec::new(),
+            selected_file: None,
+            selected_index: None,
+            diff_rows: Vec::new(),
+            scroll_handle: UniformListScrollHandle::new(),
+            split: {
+                let split = ResizableState::new(cx);
+                split.update(cx, |split, cx| split.set_sizes([px(260.)], cx));
+                split
+            },
+        }
+    }
+
+    pub fn diff(&self) -> Option<&CommitDiff> {
+        self.diff.as_ref()
+    }
+
+    pub fn set_diff(&mut self, diff: CommitDiff, cx: &mut Context<Self>) {
+        let mut paths: Vec<PathBuf> = diff
+            .files
+            .iter()
+            .map(|file| PathBuf::from(&file.path))
+            .collect();
+        paths.sort();
+        self.seeds = build_tree_items(&paths);
+        self.expanded = collect_expanded(&self.seeds);
+        self.rows = flatten(&self.seeds, &self.expanded);
+
+        let first = diff
+            .files
+            .first()
+            .map(|file| SharedString::from(file.path.as_str()));
+
+        self.selected_file = first.clone();
+        self.selected_index = first
+            .as_ref()
+            .and_then(|path| self.rows.iter().position(|row| row.id == path.as_ref()));
+        self.diff = Some(diff);
+
+        if let Some(path) = first {
+            self.set_diff_rows(path.as_ref());
+        } else {
+            self.diff_rows.clear();
+        }
+        cx.notify();
+    }
+
+    fn select_file(&mut self, path: &str, cx: &mut Context<Self>) {
+        self.selected_file = Some(path.into());
+        self.selected_index = self.rows.iter().position(|row| row.id == path);
+        self.set_diff_rows(path);
+        cx.notify();
+    }
+
+    fn set_diff_rows(&mut self, path: &str) {
+        let Some(diff) = self.diff.as_ref() else {
+            return;
+        };
+        let Some(file) = diff.files.iter().find(|file| file.path == path) else {
+            return;
+        };
+        self.diff_rows = diff_rows(file);
+        self.scroll_handle.scroll_to_item(0, ScrollStrategy::Top);
+    }
+
+    fn toggle_folder(&mut self, id: &str, cx: &mut Context<Self>) {
+        if !self.expanded.remove(id) {
+            self.expanded.insert(id.to_owned());
+        }
+        self.rows = flatten(&self.seeds, &self.expanded);
+        self.selected_index = self
+            .selected_file
+            .as_ref()
+            .and_then(|path| self.rows.iter().position(|row| row.id == path.as_ref()));
+        cx.notify();
+    }
+
+    fn render_tree_column(&self, cx: &mut Context<Self>) -> AnyElement {
+        let rows = self.rows.clone();
+        let selected = self.selected_index;
+        let view = cx.entity().downgrade();
+        let change_view = view.clone();
+
+        v_flex()
+            .h_full()
+            .min_h_0()
+            .p_2()
+            .child(
+                Tree::new("commit-diff-tree")
+                    .selected(selected)
+                    .items(move |_, _| {
+                        rows.iter()
+                            .map(|row| {
+                                let item = TreeItem::new(row.id.clone(), row.label.clone())
+                                    .depth(row.depth)
+                                    .expandable(row.expandable)
+                                    .expanded(row.expanded);
+
+                                if row.expandable {
+                                    item.icon(Icon::named(IconRole::Folder))
+                                } else {
+                                    item
+                                }
+                            })
+                            .collect()
+                    })
+                    .on_change(move |index, window, cx| {
+                        if let Some(index) = index
+                            && let Err(error) = change_view.update(cx, |this, cx| {
+                                this.activate_row(index, window, cx);
+                            })
+                        {
+                            log::warn!("failed to activate diff tree row: {error}");
+                        }
+                    })
+                    .on_disclosure({
+                        let view = view;
+                        move |index, _, cx| {
+                            if let Err(error) = view.update(cx, |this, cx| {
+                                let id = this.rows.get(index).map(|row| row.id.clone());
+                                if let Some(id) = id {
+                                    this.toggle_folder(&id, cx);
+                                }
+                            }) {
+                                log::warn!("failed to toggle diff folder: {error}");
+                            }
+                        }
+                    }),
+            )
+            .into_any_element()
+    }
+
+    fn activate_row(&mut self, index: usize, _window: &mut Window, cx: &mut Context<Self>) {
+        let Some(row) = self.rows.get(index) else {
+            return;
+        };
+        let id = row.id.clone();
+        let expandable = row.expandable;
+        self.selected_index = Some(index);
+
+        if expandable {
+            self.toggle_folder(&id, cx);
+        } else {
+            self.select_file(&id, cx);
+        }
+    }
+
+    fn render_detail_column(&self, cx: &mut Context<Self>) -> AnyElement {
+        let Some(diff) = self.diff.as_ref() else {
+            return placeholder("No changes");
+        };
+        let Some(path) = self.selected_file.clone() else {
+            return if diff.files.is_empty() {
+                placeholder("No files changed")
+            } else {
+                placeholder("Select a file")
+            };
+        };
+        let Some(file) = diff.files.iter().find(|file| file.path == path.as_ref()) else {
+            return placeholder("File not found");
+        };
+        self.render_file_diff(file, cx)
+    }
+
+    fn render_file_diff(&self, file: &FileDiff, cx: &App) -> AnyElement {
+        let status_label = match file.status {
+            DiffStatus::Added => "A",
+            DiffStatus::Modified => "M",
+            DiffStatus::Deleted => "D",
+            DiffStatus::Renamed => "R",
+            DiffStatus::Copied => "C",
+        };
+        let status_color = match file.status {
+            DiffStatus::Added => cx.theme().ramps.success.base,
+            DiffStatus::Modified => cx.theme().ramps.info.base,
+            DiffStatus::Deleted => cx.theme().ramps.destructive.base,
+            DiffStatus::Renamed | DiffStatus::Copied => cx.theme().colors.muted_foreground,
+        };
+        let title = match &file.old_path {
+            Some(old) => format!("{old} → {}", file.path),
+            None => file.path.clone(),
+        };
+
+        let body: AnyElement = if file.binary {
+            placeholder("Diff not available")
+        } else if file.hunks.is_empty() {
+            placeholder("No content changes")
+        } else {
+            let hunks = file.hunks.clone();
+            let rows = self.diff_rows.clone();
+
+            v_flex()
+                .size_full()
+                .relative()
+                .child(
+                    uniform_list("commit-diff-rows", rows.len(), move |range, _, cx| {
+                        range
+                            .map(|ix| render_diff_row(&hunks, rows[ix], cx))
+                            .collect()
+                    })
+                    .track_scroll(&self.scroll_handle)
+                    .size_full(),
+                )
+                .child(
+                    div()
+                        .absolute()
+                        .top_0()
+                        .left_0()
+                        .right_0()
+                        .bottom_0()
+                        .child(Scrollbar::vertical(
+                            "commit-diff-scroll",
+                            self.scroll_handle.clone(),
+                        )),
+                )
+                .into_any_element()
+        };
+
+        v_flex()
+            .flex_1()
+            .min_w_0()
+            .h_full()
+            .child(
+                h_flex()
+                    .px_3()
+                    .h_9()
+                    .gap_2()
+                    .child(
+                        div()
+                            .text_xs()
+                            .font_weight(gpui::FontWeight::SEMIBOLD)
+                            .text_color(status_color)
+                            .child(status_label),
+                    )
+                    .child(
+                        div()
+                            .flex_1()
+                            .min_w_0()
+                            .text_xs()
+                            .font_weight(gpui::FontWeight::SEMIBOLD)
+                            .text_ellipsis()
+                            .whitespace_nowrap()
+                            .child(title),
+                    )
+                    .when(!file.binary, |this| {
+                        this.child(
+                            h_flex()
+                                .gap_2()
+                                .text_xs()
+                                .child(
+                                    div()
+                                        .text_color(cx.theme().ramps.success.base)
+                                        .child(format!("+{}", file.insertions)),
+                                )
+                                .child(
+                                    div()
+                                        .text_color(cx.theme().ramps.destructive.base)
+                                        .child(format!("-{}", file.deletions)),
+                                ),
+                        )
+                    }),
+            )
+            .child(div().flex_1().min_h_0().child(body))
+            .into_any_element()
+    }
+}
+
+impl Render for DiffPane {
+    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let tree = self.render_tree_column(cx);
+        let detail = self.render_detail_column(cx);
+
+        h_flex()
+            .size_full()
+            .min_h_0()
+            .bg(cx.theme().colors.background)
+            .child(
+                Resizable::new("commit-diff-split", self.split.clone())
+                    .axis(Axis::Horizontal)
+                    .pane_with_min(tree, px(120.))
+                    .pane_with_min(detail, px(240.)),
+            )
+    }
+}
+
+pub struct CommitDiffView {
+    store: Entity<RepoStore>,
+    worktree: PathBuf,
+    repo_name: SharedString,
+    commit: FileCommit,
+    /// The diff is being computed on a background task.
+    loading: bool,
+    error: Option<SharedString>,
+    pane: Entity<DiffPane>,
+    /// Profile for the repository owner in the tab title.
+    directory: Entity<ProfileDirectory>,
+    tasks: Vec<Task<Result<(), anyhow::Error>>>,
+}
+
+impl CommitDiffView {
+    pub fn new(
+        store: Entity<RepoStore>,
+        worktree: PathBuf,
+        repo_name: SharedString,
+        commit_id: String,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) -> Self {
+        let pane = cx.new(DiffPane::new);
+        let directory = ProfileDirectory::new(cx);
+
+        if let Some(owner) = store.read(cx).announcement.as_ref().map(|a| a.owner) {
+            directory.update(cx, |directory, cx| {
+                directory.track([owner], cx);
+            });
+        }
+
+        let weak = cx.entity().downgrade();
+        window.defer(cx, move |window, cx| {
+            if let Err(error) = weak.update(cx, |this, cx| this.load(window, cx)) {
+                log::warn!("failed to load commit diff: {error}");
+            }
+        });
+
+        Self {
+            store,
+            worktree,
+            repo_name,
+            commit: FileCommit {
+                id: commit_id,
+                summary: String::new(),
+                description: None,
+                author: String::new(),
+                time: 0,
+            },
+            loading: true,
+            error: None,
+            pane,
+            directory,
+            tasks: Vec::new(),
+        }
+    }
+
+    fn load(&mut self, window: &mut Window, cx: &mut Context<Self>) {
+        self.loading = true;
+        self.error = None;
+        cx.notify();
+
+        let worktree = self.worktree.clone();
+        let id = self.commit.id.clone();
+
+        let task: Task<Result<(), anyhow::Error>> = cx.spawn_in(window, async move |this, cx| {
+            let commit = cx
+                .background_spawn({
+                    let worktree = worktree.clone();
+                    let id = id.clone();
+                    async move { Repo::open(&worktree).and_then(|repo| repo.commit(&id)) }
+                })
+                .await;
+            let diff = cx
+                .background_spawn({
+                    let worktree = worktree.clone();
+                    let id = id.clone();
+                    async move { Repo::open(&worktree).and_then(|repo| repo.commit_diff(&id)) }
+                })
+                .await;
+
+            this.update_in(cx, |this, _window, cx| {
+                this.loading = false;
+                if let Ok(Some(commit)) = commit {
+                    this.commit = commit;
+                }
+                match diff {
+                    Ok(diff) => {
+                        this.pane.update(cx, |pane, cx| pane.set_diff(diff, cx));
+                    }
+                    Err(error) => {
+                        this.error = Some(error.to_string().into());
+                    }
+                }
+                cx.notify();
+            })?;
+
+            Ok(())
+        });
+
+        self.tasks.push(task);
+    }
+
+    fn render_header(&self, cx: &mut Context<Self>) -> AnyElement {
+        let commit = &self.commit;
+        let (files, insertions, deletions) = self.pane.read(cx).diff().map_or((0, 0, 0), |diff| {
+            (
+                diff.files.len(),
+                diff.files.iter().map(|file| file.insertions).sum(),
+                diff.files.iter().map(|file| file.deletions).sum(),
+            )
+        });
+
+        v_flex()
+            .flex_none()
+            .px_4()
+            .py_3()
+            .w_full()
+            .gap_2()
+            .border_b_1()
+            .border_color(cx.theme().colors.border)
+            .child(
+                v_flex()
+                    .child(
+                        div()
+                            .font_weight(gpui::FontWeight::SEMIBOLD)
+                            .text_ellipsis()
+                            .whitespace_nowrap()
+                            .child(commit.summary.clone()),
+                    )
+                    .child(
+                        h_flex()
+                            .gap_2()
+                            .text_sm()
+                            .child(SharedString::from(format!("{} committed", commit.author)))
+                            .child(
+                                h_flex()
+                                    .gap_1()
+                                    .text_color(cx.theme().colors.muted_foreground)
+                                    .child(SharedString::from(&commit.id))
+                                    .child(ClipboardButton::new("commit-id", &commit.id)),
+                            )
+                            .child(
+                                div()
+                                    .text_color(cx.theme().colors.muted_foreground)
+                                    .child(relative_time_secs(commit.time)),
+                            ),
+                    ),
+            )
+            .when_some(commit.description.as_ref(), |this, description| {
+                this.child(div().text_sm().child(SharedString::from(description)))
+            })
+            .child(
+                h_flex()
+                    .gap_2()
+                    .text_xs()
+                    .child(Badge::new("commit-files", format!("{files} files changed")))
+                    .when(insertions > 0, |this| {
+                        this.child(
+                            Badge::new("commit-insertions", format!("+ {insertions}"))
+                                .variant(BadgeVariant::Success),
+                        )
+                    })
+                    .when(deletions > 0, |this| {
+                        this.child(
+                            Badge::new("commit-deletions", format!("- {deletions}"))
+                                .variant(BadgeVariant::Danger),
+                        )
+                    }),
+            )
+            .into_any_element()
+    }
+}
+
+impl Panel for CommitDiffView {
+    fn title(&self, _cx: &App) -> Option<SharedString> {
+        Some(SharedString::from(format!(
+            "{}/{}",
+            self.repo_name, self.commit.id
+        )))
+    }
+
+    fn lead(&self, cx: &App) -> Option<AnyElement> {
+        Some(super::repo_tab_avatar(
+            self.store.read(cx),
+            &self.directory,
+            cx,
+        ))
+    }
+}
+
+impl Render for CommitDiffView {
+    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let body: AnyElement = if self.loading {
+            v_flex()
+                .size_full()
+                .items_center()
+                .justify_center()
+                .child(Spinner::new("commit-diff-loading"))
+                .into_any_element()
+        } else if let Some(error) = self.error.clone() {
+            placeholder(&error)
+        } else {
+            self.pane.clone().into_any_element()
+        };
+
+        v_flex()
+            .size_full()
+            .min_h_0()
+            .child(self.render_header(cx))
+            .child(div().flex_1().min_h_0().child(body))
+    }
+}
+
+const GUTTER_WIDTH: f32 = 44.;
+pub const DIFF_ROW_HEIGHT: f32 = 20.;
+pub const COMMIT_ROW_HEIGHT: f32 = 56.;
+
+#[derive(Clone, Copy)]
+enum DiffRow {
+    Hunk {
+        old_start: u32,
+        old_lines: u32,
+        new_start: u32,
+        new_lines: u32,
+    },
+    Line {
+        hunk: usize,
+        line: usize,
+    },
+}
+
+fn diff_rows(file: &FileDiff) -> Vec<DiffRow> {
+    let mut rows = Vec::new();
+    for (hunk_ix, hunk) in file.hunks.iter().enumerate() {
+        rows.push(DiffRow::Hunk {
+            old_start: hunk.old_start,
+            old_lines: hunk.old_lines,
+            new_start: hunk.new_start,
+            new_lines: hunk.new_lines,
+        });
+        rows.extend((0..hunk.lines.len()).map(|line| DiffRow::Line {
+            hunk: hunk_ix,
+            line,
+        }));
+    }
+    rows
+}
+
+fn render_diff_row(hunks: &[DiffHunk], row: DiffRow, cx: &App) -> AnyElement {
+    match row {
+        DiffRow::Hunk {
+            old_start,
+            old_lines,
+            new_start,
+            new_lines,
+        } => div()
+            .px_2()
+            .w_full()
+            .h(px(DIFF_ROW_HEIGHT))
+            .font_family(cx.theme().mono_font)
+            .text_xs()
+            .bg(cx.theme().colors.muted)
+            .border_y_1()
+            .border_color(cx.theme().colors.border)
+            .text_color(cx.theme().colors.muted_foreground)
+            .child(SharedString::from(format!(
+                "@@ -{},{} +{},{} @@",
+                old_start, old_lines, new_start, new_lines
+            )))
+            .into_any_element(),
+        DiffRow::Line { hunk, line } => render_diff_line(&hunks[hunk].lines[line], cx),
+    }
+}
+
+fn render_diff_line(line: &DiffLine, cx: &App) -> AnyElement {
+    let bg = match line.kind {
+        DiffLineKind::Addition => Some(cx.theme().ramps.success.base.opacity(0.2)),
+        DiffLineKind::Deletion => Some(cx.theme().ramps.destructive.base.opacity(0.2)),
+        DiffLineKind::Context => None,
+    };
+    let gutter = cx.theme().colors.muted_foreground;
+
+    h_flex()
+        .w_full()
+        .h(px(DIFF_ROW_HEIGHT))
+        .font_family(cx.theme().mono_font)
+        .text_xs()
+        .when_some(bg, |this, bg| this.bg(bg))
+        .child(
+            div()
+                .w(px(GUTTER_WIDTH))
+                .flex_none()
+                .pr_2()
+                .text_right()
+                .text_color(gutter)
+                .child(line.old.map(|n| n.to_string()).unwrap_or_default()),
+        )
+        .child(
+            div()
+                .w(px(GUTTER_WIDTH))
+                .flex_none()
+                .pr_2()
+                .text_right()
+                .text_color(gutter)
+                .child(line.new.map(|n| n.to_string()).unwrap_or_default()),
+        )
+        .child(
+            div()
+                .flex_1()
+                .min_w_0()
+                .overflow_hidden()
+                .whitespace_nowrap()
+                .text_color(cx.theme().colors.foreground)
+                .child(line.text.clone()),
+        )
+        .into_any_element()
+}
+
+fn placeholder(message: impl Into<SharedString>) -> AnyElement {
+    v_flex()
+        .size_full()
+        .items_center()
+        .justify_center()
+        .child(EmptyState::new(message))
+        .into_any_element()
+}

crates/signed_app/src/views/repo/history.rs

@@ -0,0 +1,279 @@
+use std::path::PathBuf;
+
+use anyhow::Error;
+use gpui::prelude::FluentBuilder as _;
+use gpui::{
+    AppContext as _, Context, Entity, InteractiveElement as _, IntoElement, ParentElement as _,
+    Render, SharedString, StatefulInteractiveElement as _, Styled as _, Task,
+    UniformListScrollHandle, WeakEntity, Window, div, px, uniform_list,
+};
+use gpui_native_kit::common::{h_flex, v_flex};
+use gpui_native_kit::empty_state::EmptyState;
+use gpui_native_kit::layout::dock::DockState;
+use gpui_native_kit::scrollbar::Scrollbar;
+use gpui_native_kit::spinner::Spinner;
+use gpui_native_kit::theme::ActiveTheme as _;
+use signed_git::{CommitList, FileCommit, Repo};
+use signed_state::RepoStore;
+use utils::relative_time_secs;
+
+use super::commit_diff::{COMMIT_ROW_HEIGHT, CommitDiffView};
+use super::repo_display_name;
+use crate::panels;
+
+pub struct RepoHistoryView {
+    store: Entity<RepoStore>,
+    dock: WeakEntity<DockState>,
+    worktree: Option<PathBuf>,
+    all_commits: Option<CommitList>,
+    loading_all_commits: bool,
+    scroll_handle: UniformListScrollHandle,
+    tasks: Vec<Task<Result<(), Error>>>,
+}
+
+impl RepoHistoryView {
+    pub fn new(store: Entity<RepoStore>, dock: WeakEntity<DockState>) -> Self {
+        Self {
+            store,
+            dock,
+            worktree: None,
+            all_commits: None,
+            loading_all_commits: false,
+            scroll_handle: UniformListScrollHandle::new(),
+            tasks: Vec::new(),
+        }
+    }
+
+    pub fn set_worktree(&mut self, path: Option<PathBuf>) {
+        self.worktree = path;
+    }
+
+    /// Number of commits reachable from HEAD, for the Commits tab label.
+    pub fn commit_count(&self) -> Option<usize> {
+        self.all_commits.as_ref().map(|list| list.total)
+    }
+
+    /// Drop the current list and walk HEAD again.
+    pub fn reload(&mut self, cx: &mut Context<Self>) {
+        self.all_commits = None;
+        self.loading_all_commits = false;
+        self.load(cx);
+    }
+
+    fn load(&mut self, cx: &mut Context<Self>) {
+        if self.loading_all_commits || self.all_commits.is_some() {
+            return;
+        }
+
+        let Some(worktree) = self.worktree.clone() else {
+            return;
+        };
+
+        self.loading_all_commits = true;
+
+        let task: Task<Result<(), Error>> = cx.spawn(async move |this, cx| {
+            let result = cx
+                .background_spawn(async move {
+                    Repo::open_cached(&worktree).and_then(|repo| repo.all_commits())
+                })
+                .await;
+
+            this.update(cx, |this, cx| {
+                if let Ok(list) = result {
+                    this.all_commits = Some(list);
+                }
+                this.loading_all_commits = false;
+                cx.notify();
+            })?;
+
+            Ok(())
+        });
+
+        self.tasks.push(task);
+    }
+
+    pub fn open_commit_diff(
+        &mut self,
+        commit_id: &str,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        let Some(worktree) = self.worktree.clone() else {
+            return;
+        };
+
+        // Same display name as the repo detail panel's title.
+        let repo_name = repo_display_name(self.store.read(cx));
+        let store = self.store.clone();
+        let commit_id = commit_id.to_owned();
+        let id = match store.read(cx).addr() {
+            Some(addr) => SharedString::from(format!("commit:{addr}:{commit_id}")),
+            None => SharedString::from(format!("commit:{}:{}", worktree.display(), commit_id)),
+        };
+        let dock = self.dock.clone();
+
+        panels::open(
+            &dock,
+            id,
+            move |window, cx| {
+                cx.new(|cx| {
+                    CommitDiffView::new(
+                        store.clone(),
+                        worktree.clone(),
+                        repo_name.clone(),
+                        commit_id.clone(),
+                        window,
+                        cx,
+                    )
+                })
+            },
+            window,
+            cx,
+        );
+    }
+}
+
+impl Render for RepoHistoryView {
+    fn render(&mut self, _window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
+        let Some(list) = self.all_commits.as_ref() else {
+            return if self.loading_all_commits {
+                v_flex()
+                    .size_full()
+                    .items_center()
+                    .justify_center()
+                    .child(Spinner::new("commits-loading"))
+                    .into_any_element()
+            } else {
+                empty_state("Failed to load commits")
+            };
+        };
+
+        if list.commits.is_empty() {
+            return empty_state("No commits found");
+        }
+
+        let commits = list.commits.clone();
+        let shown = commits.len();
+        let total = list.total;
+        let view = cx.entity().downgrade();
+
+        v_flex()
+            .relative()
+            .flex_1()
+            .w_full()
+            .min_h_0()
+            .child(
+                uniform_list("commits", shown, move |range, _, cx| {
+                    range
+                        .map(|ix| {
+                            let commit = commits[ix].clone();
+                            let id = commit.id.clone();
+                            let view = view.clone();
+                            commit_row(
+                                ix,
+                                &commit,
+                                move |window, cx| {
+                                    if let Err(error) = view.update(cx, |this, cx| {
+                                        this.open_commit_diff(&id, window, cx);
+                                    }) {
+                                        log::warn!("failed to open commit diff: {error}");
+                                    }
+                                },
+                                cx,
+                            )
+                        })
+                        .collect()
+                })
+                .track_scroll(&self.scroll_handle)
+                .size_full(),
+            )
+            .when(shown < total, |this| {
+                this.child(
+                    div()
+                        .py_2()
+                        .w_full()
+                        .text_xs()
+                        .text_color(cx.theme().colors.muted_foreground)
+                        .child(format!("Showing {shown} of {total} commits")),
+                )
+            })
+            .child(
+                div()
+                    .absolute()
+                    .top_0()
+                    .left_0()
+                    .right_0()
+                    .bottom_0()
+                    .child(Scrollbar::vertical(
+                        "commits-scroll",
+                        self.scroll_handle.clone(),
+                    )),
+            )
+            .into_any_element()
+    }
+}
+
+fn empty_state(message: &'static str) -> gpui::AnyElement {
+    v_flex()
+        .size_full()
+        .items_center()
+        .justify_center()
+        .child(EmptyState::new(message))
+        .into_any_element()
+}
+
+/// One commit row shared by the repository history and pull-request commit list.
+pub fn commit_row(
+    ix: usize,
+    commit: &FileCommit,
+    on_click: impl Fn(&mut Window, &mut gpui::App) + 'static,
+    cx: &gpui::App,
+) -> gpui::AnyElement {
+    h_flex()
+        .id(ix)
+        .px_4()
+        .h(px(COMMIT_ROW_HEIGHT))
+        .w_full()
+        .gap_3()
+        .border_b_1()
+        .border_color(cx.theme().colors.border)
+        .hover(|this| this.bg(cx.theme().colors.muted_hover))
+        .child(
+            v_flex()
+                .flex_1()
+                .min_w_0()
+                .gap_1()
+                .justify_center()
+                .child(
+                    h_flex()
+                        .gap_2()
+                        .overflow_hidden()
+                        .child(
+                            div()
+                                .font_family(cx.theme().mono_font)
+                                .text_xs()
+                                .text_color(cx.theme().colors.muted_foreground)
+                                .child(commit.id.clone()),
+                        )
+                        .child(
+                            div()
+                                .flex_1()
+                                .min_w_0()
+                                .text_sm()
+                                .text_ellipsis()
+                                .whitespace_nowrap()
+                                .child(commit.summary.clone()),
+                        ),
+                )
+                .child(
+                    h_flex()
+                        .gap_2()
+                        .text_xs()
+                        .text_color(cx.theme().colors.muted_foreground)
+                        .child(commit.author.clone())
+                        .child(relative_time_secs(commit.time)),
+                ),
+        )
+        .on_click(move |_, window, cx| on_click(window, cx))
+        .into_any_element()
+}

crates/signed_app/src/views/repo/mod.rs

@@ -15,6 +15,7 @@ use gpui_native_kit::badge::Badge;
 use gpui_native_kit::button::{Button, ButtonVariant};
 use gpui_native_kit::clipboard::ClipboardButton;
 use gpui_native_kit::common::{Sizable as _, h_flex, v_flex};
+use gpui_native_kit::data::tabs::{Tab, Tabs};
 use gpui_native_kit::dropdown_menu::DropdownMenu;
 use gpui_native_kit::icons::{Icon, IconRole};
 use gpui_native_kit::layout::dock::{DockState, Panel};
@@ -36,13 +37,16 @@ use utils::middle_truncate;
 
 pub mod actions;
 pub mod banners;
+pub mod commit_diff;
 pub mod files;
+pub mod history;
 pub mod refs;
 
 use super::tree::{TreeItemSeed, build_tree_items, sorted_worktree_paths};
 use crate::dialogs;
 use banners::Banners;
 use files::RepoFilesView;
+use history::RepoHistoryView;
 use refs::RefSwitcher;
 
 #[derive(Clone, Copy, PartialEq, Eq)]
@@ -60,6 +64,10 @@ pub struct RepoDetailView {
     repo_started: bool,
     /// The Files tab, which owns the explorer, previews and the per-file commit map.
     files: Entity<RepoFilesView>,
+    /// The Commits tab, which walks HEAD and opens commit diffs.
+    history: Entity<RepoHistoryView>,
+    /// The active tab: Files or Commits.
+    active_tab: usize,
     /// The checked-out worktree path.
     worktree: Option<PathBuf>,
     loading: bool,
@@ -134,6 +142,7 @@ impl RepoDetailView {
     ) -> Self {
         let checkouts = CheckoutsStore::global(cx);
         let files = cx.new(RepoFilesView::new);
+        let history = cx.new(|_| RepoHistoryView::new(store.clone(), dock.clone()));
         let weak = cx.entity().downgrade();
         let refs = RefSwitcher::new(weak.clone(), window, cx);
 
@@ -154,6 +163,8 @@ impl RepoDetailView {
             store: store.clone(),
             repo_started: false,
             files,
+            history,
+            active_tab: 0,
             worktree: None,
             loading: true,
             error: None,
@@ -468,6 +479,11 @@ impl RepoDetailView {
             files.set_readme(readme_path, readme, cx);
         });
 
+        self.history.update(cx, |history, cx| {
+            history.set_worktree(Some(worktree.clone()));
+            history.reload(cx);
+        });
+
         let branches: Vec<SharedString> = branches.into_iter().map(Into::into).collect();
         let tags: Vec<SharedString> = tags.into_iter().map(Into::into).collect();
 
@@ -637,6 +653,7 @@ impl RepoDetailView {
                             files.apply_entries(tree, paths, cx);
                             files.set_readme(readme_path, readme, cx);
                         });
+                        this.history.update(cx, |history, cx| history.reload(cx));
                     }
                     Err(error) => {
                         this.error = Some(error.to_string().into());
@@ -861,6 +878,7 @@ impl RepoDetailView {
         let git_for_popover = git_commands.clone();
 
         v_flex()
+            .flex_none()
             .p_4()
             .w_full()
             .gap_6()
@@ -1104,6 +1122,7 @@ impl RepoDetailView {
                             ),
                     ),
             )
+            .child(self.render_tabs(cx))
             .into_any_element()
     }
 
@@ -1135,6 +1154,7 @@ impl RepoDetailView {
         };
 
         v_flex()
+            .flex_none()
             .px_4()
             .pb_4()
             .w_full()
@@ -1169,6 +1189,37 @@ impl RepoDetailView {
                     )
                     .child(action),
             )
+            .child(self.render_tabs(cx))
+            .into_any_element()
+    }
+
+    fn render_tabs(&self, cx: &mut Context<Self>) -> AnyElement {
+        let count = self.history.read(cx).commit_count();
+        let muted = cx.theme().colors.muted_foreground;
+        let weak = cx.entity().downgrade();
+        let commits_label = match count {
+            Some(count) => SharedString::from(format!("Commits ({count})")),
+            None => SharedString::from("Commits"),
+        };
+
+        Tabs::new("repo-tabs")
+            .selected(self.active_tab)
+            .tabs(move |_, _| {
+                vec![
+                    Tab::new("files", "Files")
+                        .lead(Icon::named(CustomIconName::GitFile).color(muted)),
+                    Tab::new("commits", commits_label.clone())
+                        .lead(Icon::named(CustomIconName::GitCommit).color(muted)),
+                ]
+            })
+            .on_change(move |index, _, cx| {
+                if let Err(error) = weak.update(cx, |this, cx| {
+                    this.active_tab = index;
+                    cx.notify();
+                }) {
+                    log::warn!("failed to switch repo tab: {error}");
+                }
+            })
             .into_any_element()
     }
 
@@ -1569,7 +1620,10 @@ impl Render for RepoDetailView {
                         }),
                 )
             })
-            .child(self.render_files_tab(cx))
+            .map(|this| match self.active_tab {
+                0 => this.child(self.render_files_tab(cx)),
+                _ => this.child(self.history.clone()),
+            })
     }
 }
 
@@ -1797,7 +1851,7 @@ fn bound_repo_label(
 }
 
 /// The profile avatar shown on the repository tab.
-fn repo_tab_avatar(
+pub(crate) fn repo_tab_avatar(
     store: &RepoStore,
     directory: &Entity<ProfileDirectory>,
     cx: &App,

crates/signed_app/src/views/tree.rs

@@ -49,6 +49,24 @@ pub fn flatten(seeds: &[TreeItemSeed], expanded: &HashSet<String>) -> Vec<TreeRo
     rows
 }
 
+/// Every folder id, for starting with the tree fully expanded.
+pub fn collect_expanded(seeds: &[TreeItemSeed]) -> HashSet<String> {
+    fn push(seed: &TreeItemSeed, expanded: &mut HashSet<String>) {
+        if !seed.children.is_empty() {
+            expanded.insert(seed.id.clone());
+            for child in &seed.children {
+                push(child, expanded);
+            }
+        }
+    }
+
+    let mut expanded = HashSet::new();
+    for seed in seeds {
+        push(seed, &mut expanded);
+    }
+    expanded
+}
+
 /// Build nested tree items from a flat entry list sorted dirs-first.
 pub fn build_tree_items(entries: &[PathBuf]) -> Vec<TreeItemSeed> {
     // Node indices by full path, so parents resolve in constant time while inserting.