//! TextDiffView currently provides a UI for displaying differences between the clipboard and selected text. use anyhow::Result;use buffer_diff::{BufferDiff, BufferDiffSnapshot};use editor::{Editor, EditorEvent, MultiBuffer, ToPoint, actions::DiffClipboardWithSelectionData};use futures::{FutureExt, select_biased};use gpui::{    AnyElement, AnyView, App, AppContext as _, AsyncApp, Context, Entity, EventEmitter,    FocusHandle, Focusable, IntoElement, Render, Task, Window,};use language::{self, Buffer, Point};use project::Project;use std::{    any::{Any, TypeId},    ops::Range,    pin::pin,    sync::Arc,    time::Duration,};use ui::{Color, Icon, IconName, Label, LabelCommon as _, SharedString};use util::paths::PathExt; use workspace::{    Item, ItemHandle as _, ItemNavHistory, ToolbarItemLocation, Workspace,    item::{BreadcrumbText, ItemEvent, SaveOptions, TabContentParams},    searchable::SearchableItemHandle,}; pub struct TextDiffView {    diff_editor: Entity<Editor>,    title: SharedString,    path: Option<SharedString>,    buffer_changes_tx: watch::Sender<()>,    _recalculate_diff_task: Task<Result<()>>,} const RECALCULATE_DIFF_DEBOUNCE: Duration = Duration::from_millis(250); impl TextDiffView {    pub fn open(        diff_data: &DiffClipboardWithSelectionData,        workspace: &Workspace,        window: &mut Window,        cx: &mut App,    ) -> Option<Task<Result<Entity<Self>>>> {        let source_editor = diff_data.editor.clone();         let source_editor_buffer_and_range = source_editor.update(cx, |editor, cx| {            let multibuffer = editor.buffer().read(cx);            let source_buffer = multibuffer.as_singleton()?.clone();            let selections = editor.selections.all::<Point>(cx);            let buffer_snapshot = source_buffer.read(cx);            let first_selection = selections.first()?;            let selection_range = if first_selection.is_empty() {                Point::new(0, 0)..buffer_snapshot.max_point()            } else {                first_selection.start..first_selection.end            };             Some((source_buffer, selection_range))        });         let Some((source_buffer, selected_range)) = source_editor_buffer_and_range else {            log::warn!("There should always be at least one selection in Zed. This is a bug.");            return None;        };         let clipboard_text = diff_data.clipboard_text.clone();         let workspace = workspace.weak_handle();         let diff_buffer = cx.new(|cx| {            let source_buffer_snapshot = source_buffer.read(cx).snapshot();            let diff = BufferDiff::new(&source_buffer_snapshot.text, cx);            diff        });         let clipboard_buffer =            build_clipboard_buffer(clipboard_text, &source_buffer, selected_range.clone(), cx);         let task = window.spawn(cx, async move |cx| {            let project = workspace.update(cx, |workspace, _| workspace.project().clone())?;             update_diff_buffer(&diff_buffer, &source_buffer, &clipboard_buffer, cx).await?;             workspace.update_in(cx, |workspace, window, cx| {                let diff_view = cx.new(|cx| {                    TextDiffView::new(                        clipboard_buffer,                        source_editor,                        source_buffer,                        selected_range,                        diff_buffer,                        project,                        window,                        cx,                    )                });                 let pane = workspace.active_pane();                pane.update(cx, |pane, cx| {                    pane.add_item(Box::new(diff_view.clone()), true, true, None, window, cx);                });                 diff_view            })        });         Some(task)    }     pub fn new(        clipboard_buffer: Entity<Buffer>,        source_editor: Entity<Editor>,        source_buffer: Entity<Buffer>,        source_range: Range<Point>,        diff_buffer: Entity<BufferDiff>,        project: Entity<Project>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> Self {        let multibuffer = cx.new(|cx| {            let mut multibuffer = MultiBuffer::new(language::Capability::ReadWrite);             multibuffer.push_excerpts(                source_buffer.clone(),                [editor::ExcerptRange::new(source_range)],                cx,            );             multibuffer.add_diff(diff_buffer.clone(), cx);            multibuffer        });        let diff_editor = cx.new(|cx| {            let mut editor = Editor::for_multibuffer(multibuffer, Some(project), window, cx);            editor.start_temporary_diff_override();            editor.disable_diagnostics(cx);            editor.set_expand_all_diff_hunks(cx);            editor.set_render_diff_hunk_controls(                Arc::new(|_, _, _, _, _, _, _, _| gpui::Empty.into_any_element()),                cx,            );            editor        });         let (buffer_changes_tx, mut buffer_changes_rx) = watch::channel(());         cx.subscribe(&source_buffer, move |this, _, event, _| match event {            language::BufferEvent::Edited            | language::BufferEvent::LanguageChanged            | language::BufferEvent::Reparsed => {                this.buffer_changes_tx.send(()).ok();            }            _ => {}        })        .detach();         let editor = source_editor.read(cx);        let title = editor.buffer().read(cx).title(cx).to_string();        let selection_location_text = selection_location_text(editor, cx);        let selection_location_title = selection_location_text            .as_ref()            .map(|text| format!("{} @ {}", title, text))            .unwrap_or(title);         let path = editor            .buffer()            .read(cx)            .as_singleton()            .and_then(|b| {                b.read(cx)                    .file()                    .map(|f| f.full_path(cx).compact().to_string_lossy().to_string())            })            .unwrap_or("untitled".into());         let selection_location_path = selection_location_text            .map(|text| format!("{} @ {}", path, text))            .unwrap_or(path);         Self {            diff_editor,            title: format!("Clipboard ↔ {selection_location_title}").into(),            path: Some(format!("Clipboard ↔ {selection_location_path}").into()),            buffer_changes_tx,            _recalculate_diff_task: cx.spawn(async move |_, cx| {                while let Ok(_) = buffer_changes_rx.recv().await {                    loop {                        let mut timer = cx                            .background_executor()                            .timer(RECALCULATE_DIFF_DEBOUNCE)                            .fuse();                        let mut recv = pin!(buffer_changes_rx.recv().fuse());                        select_biased! {                            _ = timer => break,                            _ = recv => continue,                        }                    }                     log::trace!("start recalculating");                    update_diff_buffer(&diff_buffer, &source_buffer, &clipboard_buffer, cx).await?;                    log::trace!("finish recalculating");                }                Ok(())            }),        }    }} fn build_clipboard_buffer(    clipboard_text: String,    source_buffer: &Entity<Buffer>,    selected_range: Range<Point>,    cx: &mut App,) -> Entity<Buffer> {    let source_buffer_snapshot = source_buffer.read(cx).snapshot();    cx.new(|cx| {        let mut buffer = language::Buffer::local(source_buffer_snapshot.text(), cx);        let language = source_buffer.read(cx).language().cloned();        buffer.set_language(language, cx);         let range_start = source_buffer_snapshot.point_to_offset(selected_range.start);        let range_end = source_buffer_snapshot.point_to_offset(selected_range.end);        buffer.edit([(range_start..range_end, clipboard_text)], None, cx);         buffer    })} async fn update_diff_buffer(    diff: &Entity<BufferDiff>,    source_buffer: &Entity<Buffer>,    clipboard_buffer: &Entity<Buffer>,    cx: &mut AsyncApp,) -> Result<()> {    let source_buffer_snapshot = source_buffer.read_with(cx, |buffer, _| buffer.snapshot())?;     let base_buffer_snapshot = clipboard_buffer.read_with(cx, |buffer, _| buffer.snapshot())?;    let base_text = base_buffer_snapshot.text().to_string();     let diff_snapshot = cx        .update(|cx| {            BufferDiffSnapshot::new_with_base_buffer(                source_buffer_snapshot.text.clone(),                Some(Arc::new(base_text)),                base_buffer_snapshot,                cx,            )        })?        .await;     diff.update(cx, |diff, cx| {        diff.set_snapshot(diff_snapshot, &source_buffer_snapshot.text, cx);    })?;    Ok(())} impl EventEmitter<EditorEvent> for TextDiffView {} impl Focusable for TextDiffView {    fn focus_handle(&self, cx: &App) -> FocusHandle {        self.diff_editor.focus_handle(cx)    }} impl Item for TextDiffView {    type Event = EditorEvent;     fn tab_icon(&self, _window: &Window, _cx: &App) -> Option<Icon> {        Some(Icon::new(IconName::Diff).color(Color::Muted))    }     fn tab_content(&self, params: TabContentParams, _window: &Window, cx: &App) -> AnyElement {        Label::new(self.tab_content_text(params.detail.unwrap_or_default(), cx))            .color(if params.selected {                Color::Default            } else {                Color::Muted            })            .into_any_element()    }     fn tab_content_text(&self, _detail: usize, _: &App) -> SharedString {        self.title.clone()    }     fn tab_tooltip_text(&self, _: &App) -> Option<SharedString> {        self.path.clone()    }     fn to_item_events(event: &EditorEvent, f: impl FnMut(ItemEvent)) {        Editor::to_item_events(event, f)    }     fn telemetry_event_text(&self) -> Option<&'static str> {        Some("Diff View Opened")    }     fn deactivated(&mut self, window: &mut Window, cx: &mut Context<Self>) {        self.diff_editor            .update(cx, |editor, cx| editor.deactivated(window, cx));    }     fn is_singleton(&self, _: &App) -> bool {        false    }     fn act_as_type<'a>(        &'a self,        type_id: TypeId,        self_handle: &'a Entity<Self>,        _: &'a App,    ) -> Option<AnyView> {        if type_id == TypeId::of::<Self>() {            Some(self_handle.to_any())        } else if type_id == TypeId::of::<Editor>() {            Some(self.diff_editor.to_any())        } else {            None        }    }     fn as_searchable(&self, _: &Entity<Self>) -> Option<Box<dyn SearchableItemHandle>> {        Some(Box::new(self.diff_editor.clone()))    }     fn for_each_project_item(        &self,        cx: &App,        f: &mut dyn FnMut(gpui::EntityId, &dyn project::ProjectItem),    ) {        self.diff_editor.for_each_project_item(cx, f)    }     fn set_nav_history(        &mut self,        nav_history: ItemNavHistory,        _: &mut Window,        cx: &mut Context<Self>,    ) {        self.diff_editor.update(cx, |editor, _| {            editor.set_nav_history(Some(nav_history));        });    }     fn navigate(        &mut self,        data: Box<dyn Any>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> bool {        self.diff_editor            .update(cx, |editor, cx| editor.navigate(data, window, cx))    }     fn breadcrumb_location(&self, _: &App) -> ToolbarItemLocation {        ToolbarItemLocation::PrimaryLeft    }     fn breadcrumbs(&self, theme: &theme::Theme, cx: &App) -> Option<Vec<BreadcrumbText>> {        self.diff_editor.breadcrumbs(theme, cx)    }     fn added_to_workspace(        &mut self,        workspace: &mut Workspace,        window: &mut Window,        cx: &mut Context<Self>,    ) {        self.diff_editor.update(cx, |editor, cx| {            editor.added_to_workspace(workspace, window, cx)        });    }     fn can_save(&self, cx: &App) -> bool {        // The editor handles the new buffer, so delegate to it        self.diff_editor.read(cx).can_save(cx)    }     fn save(        &mut self,        options: SaveOptions,        project: Entity<Project>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> Task<Result<()>> {        // Delegate saving to the editor, which manages the new buffer        self.diff_editor            .update(cx, |editor, cx| editor.save(options, project, window, cx))    }} pub fn selection_location_text(editor: &Editor, cx: &App) -> Option<String> {    let buffer = editor.buffer().read(cx);    let buffer_snapshot = buffer.snapshot(cx);    let first_selection = editor.selections.disjoint.first()?;     let (start_row, start_column, end_row, end_column) =        if first_selection.start == first_selection.end {            let max_point = buffer_snapshot.max_point();            (0, 0, max_point.row, max_point.column)        } else {            let selection_start = first_selection.start.to_point(&buffer_snapshot);            let selection_end = first_selection.end.to_point(&buffer_snapshot);             (                selection_start.row,                selection_start.column,                selection_end.row,                selection_end.column,            )        };     let range_text = if start_row == end_row {        format!("L{}:{}-{}", start_row + 1, start_column + 1, end_column + 1)    } else {        format!(            "L{}:{}-L{}:{}",            start_row + 1,            start_column + 1,            end_row + 1,            end_column + 1        )    };     Some(range_text)} impl Render for TextDiffView {    fn render(&mut self, _: &mut Window, _: &mut Context<Self>) -> impl IntoElement {        self.diff_editor.clone()    }} #[cfg(test)]mod tests {    use super::*;     use editor::{actions, test::editor_test_context::assert_state_with_diff};    use gpui::{TestAppContext, VisualContext};    use project::{FakeFs, Project};    use serde_json::json;    use settings::{Settings, SettingsStore};    use unindent::unindent;    use util::path;     fn init_test(cx: &mut TestAppContext) {        cx.update(|cx| {            let settings_store = SettingsStore::test(cx);            cx.set_global(settings_store);            language::init(cx);            Project::init_settings(cx);            workspace::init_settings(cx);            editor::init_settings(cx);            theme::ThemeSettings::register(cx)        });    }     #[gpui::test]    async fn test_diffing_clipboard_against_specific_selection(cx: &mut TestAppContext) {        base_test(true, cx).await;    }     #[gpui::test]    async fn test_diffing_clipboard_against_empty_selection_uses_full_buffer(        cx: &mut TestAppContext,    ) {        base_test(false, cx).await;    }     async fn base_test(select_all_text: bool, cx: &mut TestAppContext) {        init_test(cx);         let fs = FakeFs::new(cx.executor());        fs.insert_tree(            path!("/test"),            json!({                "a": {                    "b": {                        "text.txt": "new line 1\nline 2\nnew line 3\nline 4"                    }                }            }),        )        .await;         let project = Project::test(fs, [path!("/test").as_ref()], cx).await;         let (workspace, mut cx) =            cx.add_window_view(|window, cx| Workspace::test_new(project.clone(), window, cx));         let buffer = project            .update(cx, |project, cx| {                project.open_local_buffer(path!("/test/a/b/text.txt"), cx)            })            .await            .unwrap();         let editor = cx.new_window_entity(|window, cx| {            let mut editor = Editor::for_buffer(buffer, None, window, cx);

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