//! TextDiffView currently provides a UI for displaying differences between the clipboard and selected text. use anyhow::Result;use buffer_diff::BufferDiff;use editor::{Editor, EditorEvent, MultiBuffer, ToPoint, actions::DiffClipboardWithSelectionData};use futures::{FutureExt, select_biased};use gpui::{    AnyElement, 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},    cmp,    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, Workspace,    item::{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 selection_data = source_editor.update(cx, |editor, cx| {            let multibuffer = editor.buffer().read(cx);            let source_buffer = multibuffer.as_singleton()?;            let selections = editor.selections.all::<Point>(&editor.display_snapshot(cx));            let buffer_snapshot = source_buffer.read(cx);            let first_selection = selections.first()?;            let max_point = buffer_snapshot.max_point();             if first_selection.is_empty() {                let full_range = Point::new(0, 0)..max_point;                return Some((source_buffer, full_range));            }             let start = first_selection.start;            let end = first_selection.end;            let expanded_start = Point::new(start.row, 0);             let expanded_end = if end.column > 0 {                let next_row = end.row + 1;                cmp::min(max_point, Point::new(next_row, 0))            } else {                end            };            Some((source_buffer, expanded_start..expanded_end))        });         let Some((source_buffer, expanded_selection_range)) = selection_data else {            log::warn!("There should always be at least one selection in Zed. This is a bug.");            return None;        };         source_editor.update(cx, |source_editor, cx| {            source_editor.change_selections(Default::default(), window, cx, |s| {                s.select_ranges(vec![                    expanded_selection_range.start..expanded_selection_range.end,                ]);            })        });         let source_buffer_snapshot = source_buffer.read(cx).snapshot();        let mut clipboard_text = diff_data.clipboard_text.clone();         if !clipboard_text.ends_with("\n") {            clipboard_text.push_str("\n");        }         let workspace = workspace.weak_handle();        let diff_buffer = cx.new(|cx| BufferDiff::new(&source_buffer_snapshot.text, cx));        let clipboard_buffer = build_clipboard_buffer(            clipboard_text,            &source_buffer,            expanded_selection_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,                        expanded_selection_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.set_excerpts_for_buffer(source_buffer.clone(), [source_range], 0, 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().into_owned())            })            .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 buffer_changes_rx.recv().await.is_ok() {                    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(    text: String,    source_buffer: &Entity<Buffer>,    replacement_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(replacement_range.start);        let range_end = source_buffer_snapshot.point_to_offset(replacement_range.end);        buffer.edit([(range_start..range_end, 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 language = source_buffer_snapshot.language().cloned();    let language_registry = source_buffer.read_with(cx, |buffer, _| buffer.language_registry());     let base_buffer_snapshot = clipboard_buffer.read_with(cx, |buffer, _| buffer.snapshot());    let base_text = base_buffer_snapshot.text();     let update = diff        .update(cx, |diff, cx| {            diff.update_diff(                source_buffer_snapshot.text.clone(),                Some(Arc::from(base_text.as_str())),                Some(true),                language.clone(),                cx,            )        })        .await;     diff.update(cx, |diff, cx| {        diff.language_changed(language, language_registry, cx);        diff.set_snapshot(update, &source_buffer_snapshot.text, cx)    })    .await;    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: &mut dyn FnMut(ItemEvent)) {        Editor::to_item_events(event, f)    }     fn telemetry_event_text(&self) -> Option<&'static str> {        Some("Selection 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 act_as_type<'a>(        &'a self,        type_id: TypeId,        self_handle: &'a Entity<Self>,        _: &'a App,    ) -> Option<gpui::AnyEntity> {        if type_id == TypeId::of::<Self>() {            Some(self_handle.clone().into())        } else if type_id == TypeId::of::<Editor>() {            Some(self.diff_editor.clone().into())        } else {            None        }    }     fn as_searchable(&self, _: &Entity<Self>, _: &App) -> 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: Arc<dyn Any + Send>,        window: &mut Window,        cx: &mut Context<Self>,    ) -> bool {        self.diff_editor            .update(cx, |editor, cx| editor.navigate(data, window, 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_anchors().first()?;     let selection_start = first_selection.start.to_point(&buffer_snapshot);    let selection_end = first_selection.end.to_point(&buffer_snapshot);     let start_row = selection_start.row;    let start_column = selection_start.column;    let end_row = selection_end.row;    let end_column = 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::{MultiBufferOffset, test::editor_test_context::assert_state_with_diff};    use gpui::{TestAppContext, VisualContext};    use project::{FakeFs, Project};    use serde_json::json;    use settings::SettingsStore;    use unindent::unindent;    use util::{path, test::marked_text_ranges};    use workspace::MultiWorkspace;     fn init_test(cx: &mut TestAppContext) {        cx.update(|cx| {            let settings_store = SettingsStore::test(cx);            cx.set_global(settings_store);            theme::init(theme::LoadThemes::JustBase, cx);        });    }     #[gpui::test]    async fn test_diffing_clipboard_against_empty_selection_uses_full_buffer_selection(        cx: &mut TestAppContext,    ) {        base_test(            path!("/test"),            path!("/test/text.txt"),            "def process_incoming_inventory(items, warehouse_id):\n    pass\n",            "def process_outgoing_inventory(items, warehouse_id):\n    passˇ\n",            &unindent(                "                - def process_incoming_inventory(items, warehouse_id):                + ˇdef process_outgoing_inventory(items, warehouse_id):                      pass                ",            ),            "Clipboard ↔ text.txt @ L1:1-L3:1",            &format!("Clipboard ↔ {} @ L1:1-L3:1", path!("test/text.txt")),            cx,        )        .await;    }     #[gpui::test]    async fn test_diffing_clipboard_against_multiline_selection_expands_to_full_lines(        cx: &mut TestAppContext,    ) {        base_test(            path!("/test"),            path!("/test/text.txt"),            "def process_incoming_inventory(items, warehouse_id):\n    pass\n",            "«def process_outgoing_inventory(items, warehouse_id):\n    passˇ»\n",            &unindent(                "                - def process_incoming_inventory(items, warehouse_id):                + ˇdef process_outgoing_inventory(items, warehouse_id):                      pass                ",            ),            "Clipboard ↔ text.txt @ L1:1-L3:1",            &format!("Clipboard ↔ {} @ L1:1-L3:1", path!("test/text.txt")),            cx,

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