1use crate::{
2 display_map::ToDisplayPoint, link_go_to_definition::hide_link_definition,
3 movement::surrounding_word, Anchor, Autoscroll, Editor, Event, ExcerptId, MultiBuffer,
4 MultiBufferSnapshot, NavigationData, ToPoint as _,
5};
6use anyhow::{anyhow, Result};
7use futures::FutureExt;
8use gpui::{
9 elements::*, geometry::vector::vec2f, AppContext, Entity, ModelHandle, MutableAppContext,
10 RenderContext, Subscription, Task, View, ViewContext, ViewHandle,
11};
12use language::{Bias, Buffer, File as _, OffsetRangeExt, SelectionGoal};
13use project::{File, Project, ProjectEntryId, ProjectPath};
14use rpc::proto::{self, update_view};
15use settings::Settings;
16use smallvec::SmallVec;
17use std::{
18 borrow::Cow,
19 cmp::{self, Ordering},
20 fmt::Write,
21 ops::Range,
22 path::{Path, PathBuf},
23 time::Duration,
24};
25use text::{Point, Selection};
26use util::TryFutureExt;
27use workspace::{
28 searchable::{Direction, SearchEvent, SearchableItem, SearchableItemHandle},
29 FollowableItem, Item, ItemEvent, ItemHandle, ItemNavHistory, ProjectItem, StatusItemView,
30};
31
32pub const FORMAT_TIMEOUT: Duration = Duration::from_secs(2);
33pub const MAX_TAB_TITLE_LEN: usize = 24;
34
35impl FollowableItem for Editor {
36 fn from_state_proto(
37 pane: ViewHandle<workspace::Pane>,
38 project: ModelHandle<Project>,
39 state: &mut Option<proto::view::Variant>,
40 cx: &mut MutableAppContext,
41 ) -> Option<Task<Result<ViewHandle<Self>>>> {
42 let state = if matches!(state, Some(proto::view::Variant::Editor(_))) {
43 if let Some(proto::view::Variant::Editor(state)) = state.take() {
44 state
45 } else {
46 unreachable!()
47 }
48 } else {
49 return None;
50 };
51
52 let buffer = project.update(cx, |project, cx| {
53 project.open_buffer_by_id(state.buffer_id, cx)
54 });
55 Some(cx.spawn(|mut cx| async move {
56 let buffer = buffer.await?;
57 let editor = pane
58 .read_with(&cx, |pane, cx| {
59 pane.items_of_type::<Self>().find(|editor| {
60 editor.read(cx).buffer.read(cx).as_singleton().as_ref() == Some(&buffer)
61 })
62 })
63 .unwrap_or_else(|| {
64 pane.update(&mut cx, |_, cx| {
65 cx.add_view(|cx| Editor::for_buffer(buffer, Some(project), cx))
66 })
67 });
68 editor.update(&mut cx, |editor, cx| {
69 let excerpt_id;
70 let buffer_id;
71 {
72 let buffer = editor.buffer.read(cx).read(cx);
73 let singleton = buffer.as_singleton().unwrap();
74 excerpt_id = singleton.0.clone();
75 buffer_id = singleton.1;
76 }
77 let selections = state
78 .selections
79 .into_iter()
80 .map(|selection| {
81 deserialize_selection(&excerpt_id, buffer_id, selection)
82 .ok_or_else(|| anyhow!("invalid selection"))
83 })
84 .collect::<Result<Vec<_>>>()?;
85 if !selections.is_empty() {
86 editor.set_selections_from_remote(selections, cx);
87 }
88
89 if let Some(anchor) = state.scroll_top_anchor {
90 editor.set_scroll_top_anchor(
91 Anchor {
92 buffer_id: Some(state.buffer_id as usize),
93 excerpt_id,
94 text_anchor: language::proto::deserialize_anchor(anchor)
95 .ok_or_else(|| anyhow!("invalid scroll top"))?,
96 },
97 vec2f(state.scroll_x, state.scroll_y),
98 cx,
99 );
100 }
101
102 Ok::<_, anyhow::Error>(())
103 })?;
104 Ok(editor)
105 }))
106 }
107
108 fn set_leader_replica_id(
109 &mut self,
110 leader_replica_id: Option<u16>,
111 cx: &mut ViewContext<Self>,
112 ) {
113 self.leader_replica_id = leader_replica_id;
114 if self.leader_replica_id.is_some() {
115 self.buffer.update(cx, |buffer, cx| {
116 buffer.remove_active_selections(cx);
117 });
118 } else {
119 self.buffer.update(cx, |buffer, cx| {
120 if self.focused {
121 buffer.set_active_selections(
122 &self.selections.disjoint_anchors(),
123 self.selections.line_mode,
124 cx,
125 );
126 }
127 });
128 }
129 cx.notify();
130 }
131
132 fn to_state_proto(&self, cx: &AppContext) -> Option<proto::view::Variant> {
133 let buffer_id = self.buffer.read(cx).as_singleton()?.read(cx).remote_id();
134 Some(proto::view::Variant::Editor(proto::view::Editor {
135 buffer_id,
136 scroll_top_anchor: Some(language::proto::serialize_anchor(
137 &self.scroll_top_anchor.text_anchor,
138 )),
139 scroll_x: self.scroll_position.x(),
140 scroll_y: self.scroll_position.y(),
141 selections: self
142 .selections
143 .disjoint_anchors()
144 .iter()
145 .map(serialize_selection)
146 .collect(),
147 }))
148 }
149
150 fn add_event_to_update_proto(
151 &self,
152 event: &Self::Event,
153 update: &mut Option<proto::update_view::Variant>,
154 _: &AppContext,
155 ) -> bool {
156 let update =
157 update.get_or_insert_with(|| proto::update_view::Variant::Editor(Default::default()));
158
159 match update {
160 proto::update_view::Variant::Editor(update) => match event {
161 Event::ScrollPositionChanged { .. } => {
162 update.scroll_top_anchor = Some(language::proto::serialize_anchor(
163 &self.scroll_top_anchor.text_anchor,
164 ));
165 update.scroll_x = self.scroll_position.x();
166 update.scroll_y = self.scroll_position.y();
167 true
168 }
169 Event::SelectionsChanged { .. } => {
170 update.selections = self
171 .selections
172 .disjoint_anchors()
173 .iter()
174 .chain(self.selections.pending_anchor().as_ref())
175 .map(serialize_selection)
176 .collect();
177 true
178 }
179 _ => false,
180 },
181 }
182 }
183
184 fn apply_update_proto(
185 &mut self,
186 message: update_view::Variant,
187 cx: &mut ViewContext<Self>,
188 ) -> Result<()> {
189 match message {
190 update_view::Variant::Editor(message) => {
191 let buffer = self.buffer.read(cx);
192 let buffer = buffer.read(cx);
193 let (excerpt_id, buffer_id, _) = buffer.as_singleton().unwrap();
194 let excerpt_id = excerpt_id.clone();
195 drop(buffer);
196
197 let selections = message
198 .selections
199 .into_iter()
200 .filter_map(|selection| {
201 deserialize_selection(&excerpt_id, buffer_id, selection)
202 })
203 .collect::<Vec<_>>();
204
205 if !selections.is_empty() {
206 self.set_selections_from_remote(selections, cx);
207 self.request_autoscroll_remotely(Autoscroll::Newest, cx);
208 } else if let Some(anchor) = message.scroll_top_anchor {
209 self.set_scroll_top_anchor(
210 Anchor {
211 buffer_id: Some(buffer_id),
212 excerpt_id,
213 text_anchor: language::proto::deserialize_anchor(anchor)
214 .ok_or_else(|| anyhow!("invalid scroll top"))?,
215 },
216 vec2f(message.scroll_x, message.scroll_y),
217 cx,
218 );
219 }
220 }
221 }
222 Ok(())
223 }
224
225 fn should_unfollow_on_event(event: &Self::Event, _: &AppContext) -> bool {
226 match event {
227 Event::Edited => true,
228 Event::SelectionsChanged { local } => *local,
229 Event::ScrollPositionChanged { local } => *local,
230 _ => false,
231 }
232 }
233}
234
235fn serialize_selection(selection: &Selection<Anchor>) -> proto::Selection {
236 proto::Selection {
237 id: selection.id as u64,
238 start: Some(language::proto::serialize_anchor(
239 &selection.start.text_anchor,
240 )),
241 end: Some(language::proto::serialize_anchor(
242 &selection.end.text_anchor,
243 )),
244 reversed: selection.reversed,
245 }
246}
247
248fn deserialize_selection(
249 excerpt_id: &ExcerptId,
250 buffer_id: usize,
251 selection: proto::Selection,
252) -> Option<Selection<Anchor>> {
253 Some(Selection {
254 id: selection.id as usize,
255 start: Anchor {
256 buffer_id: Some(buffer_id),
257 excerpt_id: excerpt_id.clone(),
258 text_anchor: language::proto::deserialize_anchor(selection.start?)?,
259 },
260 end: Anchor {
261 buffer_id: Some(buffer_id),
262 excerpt_id: excerpt_id.clone(),
263 text_anchor: language::proto::deserialize_anchor(selection.end?)?,
264 },
265 reversed: selection.reversed,
266 goal: SelectionGoal::None,
267 })
268}
269
270impl Item for Editor {
271 fn navigate(&mut self, data: Box<dyn std::any::Any>, cx: &mut ViewContext<Self>) -> bool {
272 if let Ok(data) = data.downcast::<NavigationData>() {
273 let newest_selection = self.selections.newest::<Point>(cx);
274 let buffer = self.buffer.read(cx).read(cx);
275 let offset = if buffer.can_resolve(&data.cursor_anchor) {
276 data.cursor_anchor.to_point(&buffer)
277 } else {
278 buffer.clip_point(data.cursor_position, Bias::Left)
279 };
280
281 let scroll_top_anchor = if buffer.can_resolve(&data.scroll_top_anchor) {
282 data.scroll_top_anchor
283 } else {
284 buffer.anchor_before(
285 buffer.clip_point(Point::new(data.scroll_top_row, 0), Bias::Left),
286 )
287 };
288
289 drop(buffer);
290
291 if newest_selection.head() == offset {
292 false
293 } else {
294 let nav_history = self.nav_history.take();
295 self.scroll_position = data.scroll_position;
296 self.scroll_top_anchor = scroll_top_anchor;
297 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
298 s.select_ranges([offset..offset])
299 });
300 self.nav_history = nav_history;
301 true
302 }
303 } else {
304 false
305 }
306 }
307
308 fn tab_description<'a>(&'a self, detail: usize, cx: &'a AppContext) -> Option<Cow<'a, str>> {
309 match path_for_buffer(&self.buffer, detail, true, cx)? {
310 Cow::Borrowed(path) => Some(path.to_string_lossy()),
311 Cow::Owned(path) => Some(path.to_string_lossy().to_string().into()),
312 }
313 }
314
315 fn tab_content(
316 &self,
317 detail: Option<usize>,
318 style: &theme::Tab,
319 cx: &AppContext,
320 ) -> ElementBox {
321 Flex::row()
322 .with_child(
323 Label::new(self.title(cx).into(), style.label.clone())
324 .aligned()
325 .boxed(),
326 )
327 .with_children(detail.and_then(|detail| {
328 let path = path_for_buffer(&self.buffer, detail, false, cx)?;
329 let description = path.to_string_lossy();
330 Some(
331 Label::new(
332 if description.len() > MAX_TAB_TITLE_LEN {
333 description[..MAX_TAB_TITLE_LEN].to_string() + "…"
334 } else {
335 description.into()
336 },
337 style.description.text.clone(),
338 )
339 .contained()
340 .with_style(style.description.container)
341 .aligned()
342 .boxed(),
343 )
344 }))
345 .boxed()
346 }
347
348 fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
349 let buffer = self.buffer.read(cx).as_singleton()?;
350 let file = buffer.read(cx).file();
351 File::from_dyn(file).map(|file| ProjectPath {
352 worktree_id: file.worktree_id(cx),
353 path: file.path().clone(),
354 })
355 }
356
357 fn project_entry_ids(&self, cx: &AppContext) -> SmallVec<[ProjectEntryId; 3]> {
358 self.buffer
359 .read(cx)
360 .files(cx)
361 .into_iter()
362 .filter_map(|file| File::from_dyn(Some(file))?.project_entry_id(cx))
363 .collect()
364 }
365
366 fn is_singleton(&self, cx: &AppContext) -> bool {
367 self.buffer.read(cx).is_singleton()
368 }
369
370 fn clone_on_split(&self, cx: &mut ViewContext<Self>) -> Option<Self>
371 where
372 Self: Sized,
373 {
374 Some(self.clone(cx))
375 }
376
377 fn set_nav_history(&mut self, history: ItemNavHistory, _: &mut ViewContext<Self>) {
378 self.nav_history = Some(history);
379 }
380
381 fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
382 let selection = self.selections.newest_anchor();
383 self.push_to_nav_history(selection.head(), None, cx);
384 }
385
386 fn workspace_deactivated(&mut self, cx: &mut ViewContext<Self>) {
387 hide_link_definition(self, cx);
388 self.link_go_to_definition_state.last_mouse_location = None;
389 }
390
391 fn is_dirty(&self, cx: &AppContext) -> bool {
392 self.buffer().read(cx).read(cx).is_dirty()
393 }
394
395 fn has_conflict(&self, cx: &AppContext) -> bool {
396 self.buffer().read(cx).read(cx).has_conflict()
397 }
398
399 fn can_save(&self, cx: &AppContext) -> bool {
400 !self.buffer().read(cx).is_singleton() || self.project_path(cx).is_some()
401 }
402
403 fn save(
404 &mut self,
405 project: ModelHandle<Project>,
406 cx: &mut ViewContext<Self>,
407 ) -> Task<Result<()>> {
408 let buffer = self.buffer().clone();
409 let buffers = buffer.read(cx).all_buffers();
410 let mut timeout = cx.background().timer(FORMAT_TIMEOUT).fuse();
411 let format = project.update(cx, |project, cx| project.format(buffers, true, cx));
412 cx.spawn(|_, mut cx| async move {
413 let transaction = futures::select_biased! {
414 _ = timeout => {
415 log::warn!("timed out waiting for formatting");
416 None
417 }
418 transaction = format.log_err().fuse() => transaction,
419 };
420
421 buffer
422 .update(&mut cx, |buffer, cx| {
423 if let Some(transaction) = transaction {
424 if !buffer.is_singleton() {
425 buffer.push_transaction(&transaction.0);
426 }
427 }
428
429 buffer.save(cx)
430 })
431 .await?;
432 Ok(())
433 })
434 }
435
436 fn save_as(
437 &mut self,
438 project: ModelHandle<Project>,
439 abs_path: PathBuf,
440 cx: &mut ViewContext<Self>,
441 ) -> Task<Result<()>> {
442 let buffer = self
443 .buffer()
444 .read(cx)
445 .as_singleton()
446 .expect("cannot call save_as on an excerpt list");
447
448 project.update(cx, |project, cx| {
449 project.save_buffer_as(buffer, abs_path, cx)
450 })
451 }
452
453 fn reload(
454 &mut self,
455 project: ModelHandle<Project>,
456 cx: &mut ViewContext<Self>,
457 ) -> Task<Result<()>> {
458 let buffer = self.buffer().clone();
459 let buffers = self.buffer.read(cx).all_buffers();
460 let reload_buffers =
461 project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
462 cx.spawn(|this, mut cx| async move {
463 let transaction = reload_buffers.log_err().await;
464 this.update(&mut cx, |editor, cx| {
465 editor.request_autoscroll(Autoscroll::Fit, cx)
466 });
467 buffer.update(&mut cx, |buffer, _| {
468 if let Some(transaction) = transaction {
469 if !buffer.is_singleton() {
470 buffer.push_transaction(&transaction.0);
471 }
472 }
473 });
474 Ok(())
475 })
476 }
477
478 fn to_item_events(event: &Self::Event) -> Vec<workspace::ItemEvent> {
479 match event {
480 Event::Closed => vec![ItemEvent::CloseItem],
481 Event::Saved | Event::DirtyChanged | Event::TitleChanged => vec![ItemEvent::UpdateTab],
482 Event::BufferEdited => vec![ItemEvent::Edit],
483 _ => Vec::new(),
484 }
485 }
486
487 fn as_searchable(&self, handle: &ViewHandle<Self>) -> Option<Box<dyn SearchableItemHandle>> {
488 Some(Box::new(handle.clone()))
489 }
490}
491
492impl ProjectItem for Editor {
493 type Item = Buffer;
494
495 fn for_project_item(
496 project: ModelHandle<Project>,
497 buffer: ModelHandle<Buffer>,
498 cx: &mut ViewContext<Self>,
499 ) -> Self {
500 Self::for_buffer(buffer, Some(project), cx)
501 }
502}
503
504enum BufferSearchHighlights {}
505impl SearchableItem for Editor {
506 type Match = Range<Anchor>;
507
508 fn to_search_event(event: &Self::Event) -> Option<SearchEvent> {
509 match event {
510 Event::BufferEdited => Some(SearchEvent::MatchesInvalidated),
511 Event::SelectionsChanged { .. } => Some(SearchEvent::ActiveMatchChanged),
512 _ => None,
513 }
514 }
515
516 fn clear_matches(&mut self, cx: &mut ViewContext<Self>) {
517 self.clear_background_highlights::<BufferSearchHighlights>(cx);
518 }
519
520 fn update_matches(&mut self, matches: Vec<Range<Anchor>>, cx: &mut ViewContext<Self>) {
521 self.highlight_background::<BufferSearchHighlights>(
522 matches,
523 |theme| theme.search.match_background,
524 cx,
525 );
526 }
527
528 fn query_suggestion(&mut self, cx: &mut ViewContext<Self>) -> String {
529 let display_map = self.snapshot(cx).display_snapshot;
530 let selection = self.selections.newest::<usize>(cx);
531 if selection.start == selection.end {
532 let point = selection.start.to_display_point(&display_map);
533 let range = surrounding_word(&display_map, point);
534 let range = range.start.to_offset(&display_map, Bias::Left)
535 ..range.end.to_offset(&display_map, Bias::Right);
536 let text: String = display_map.buffer_snapshot.text_for_range(range).collect();
537 if text.trim().is_empty() {
538 String::new()
539 } else {
540 text
541 }
542 } else {
543 display_map
544 .buffer_snapshot
545 .text_for_range(selection.start..selection.end)
546 .collect()
547 }
548 }
549
550 fn activate_match(
551 &mut self,
552 index: usize,
553 matches: Vec<Range<Anchor>>,
554 cx: &mut ViewContext<Self>,
555 ) {
556 self.unfold_ranges([matches[index].clone()], false, cx);
557 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
558 s.select_ranges([matches[index].clone()])
559 });
560 }
561
562 fn match_index_for_direction(
563 &mut self,
564 matches: &Vec<Range<Anchor>>,
565 mut current_index: usize,
566 direction: Direction,
567 cx: &mut ViewContext<Self>,
568 ) -> usize {
569 let buffer = self.buffer().read(cx).snapshot(cx);
570 let cursor = self.selections.newest_anchor().head();
571 if matches[current_index].start.cmp(&cursor, &buffer).is_gt() {
572 if direction == Direction::Prev {
573 if current_index == 0 {
574 current_index = matches.len() - 1;
575 } else {
576 current_index -= 1;
577 }
578 }
579 } else if matches[current_index].end.cmp(&cursor, &buffer).is_lt() {
580 if direction == Direction::Next {
581 current_index = 0;
582 }
583 } else if direction == Direction::Prev {
584 if current_index == 0 {
585 current_index = matches.len() - 1;
586 } else {
587 current_index -= 1;
588 }
589 } else if direction == Direction::Next {
590 if current_index == matches.len() - 1 {
591 current_index = 0
592 } else {
593 current_index += 1;
594 }
595 };
596 current_index
597 }
598
599 fn find_matches(
600 &mut self,
601 query: project::search::SearchQuery,
602 cx: &mut ViewContext<Self>,
603 ) -> Task<Vec<Range<Anchor>>> {
604 let buffer = self.buffer().read(cx).snapshot(cx);
605 cx.background().spawn(async move {
606 let mut ranges = Vec::new();
607 if let Some((_, _, excerpt_buffer)) = buffer.as_singleton() {
608 ranges.extend(
609 query
610 .search(excerpt_buffer.as_rope())
611 .await
612 .into_iter()
613 .map(|range| {
614 buffer.anchor_after(range.start)..buffer.anchor_before(range.end)
615 }),
616 );
617 } else {
618 for excerpt in buffer.excerpt_boundaries_in_range(0..buffer.len()) {
619 let excerpt_range = excerpt.range.context.to_offset(&excerpt.buffer);
620 let rope = excerpt.buffer.as_rope().slice(excerpt_range.clone());
621 ranges.extend(query.search(&rope).await.into_iter().map(|range| {
622 let start = excerpt
623 .buffer
624 .anchor_after(excerpt_range.start + range.start);
625 let end = excerpt
626 .buffer
627 .anchor_before(excerpt_range.start + range.end);
628 buffer.anchor_in_excerpt(excerpt.id.clone(), start)
629 ..buffer.anchor_in_excerpt(excerpt.id.clone(), end)
630 }));
631 }
632 }
633 ranges
634 })
635 }
636
637 fn active_match_index(
638 &mut self,
639 matches: Vec<Range<Anchor>>,
640 cx: &mut ViewContext<Self>,
641 ) -> Option<usize> {
642 active_match_index(
643 &matches,
644 &self.selections.newest_anchor().head(),
645 &self.buffer().read(cx).snapshot(cx),
646 )
647 }
648}
649
650pub fn active_match_index(
651 ranges: &[Range<Anchor>],
652 cursor: &Anchor,
653 buffer: &MultiBufferSnapshot,
654) -> Option<usize> {
655 if ranges.is_empty() {
656 None
657 } else {
658 match ranges.binary_search_by(|probe| {
659 if probe.end.cmp(cursor, &*buffer).is_lt() {
660 Ordering::Less
661 } else if probe.start.cmp(cursor, &*buffer).is_gt() {
662 Ordering::Greater
663 } else {
664 Ordering::Equal
665 }
666 }) {
667 Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
668 }
669 }
670}
671
672pub struct CursorPosition {
673 position: Option<Point>,
674 selected_count: usize,
675 _observe_active_editor: Option<Subscription>,
676}
677
678impl Default for CursorPosition {
679 fn default() -> Self {
680 Self::new()
681 }
682}
683
684impl CursorPosition {
685 pub fn new() -> Self {
686 Self {
687 position: None,
688 selected_count: 0,
689 _observe_active_editor: None,
690 }
691 }
692
693 fn update_position(&mut self, editor: ViewHandle<Editor>, cx: &mut ViewContext<Self>) {
694 let editor = editor.read(cx);
695 let buffer = editor.buffer().read(cx).snapshot(cx);
696
697 self.selected_count = 0;
698 let mut last_selection: Option<Selection<usize>> = None;
699 for selection in editor.selections.all::<usize>(cx) {
700 self.selected_count += selection.end - selection.start;
701 if last_selection
702 .as_ref()
703 .map_or(true, |last_selection| selection.id > last_selection.id)
704 {
705 last_selection = Some(selection);
706 }
707 }
708 self.position = last_selection.map(|s| s.head().to_point(&buffer));
709
710 cx.notify();
711 }
712}
713
714impl Entity for CursorPosition {
715 type Event = ();
716}
717
718impl View for CursorPosition {
719 fn ui_name() -> &'static str {
720 "CursorPosition"
721 }
722
723 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
724 if let Some(position) = self.position {
725 let theme = &cx.global::<Settings>().theme.workspace.status_bar;
726 let mut text = format!("{},{}", position.row + 1, position.column + 1);
727 if self.selected_count > 0 {
728 write!(text, " ({} selected)", self.selected_count).unwrap();
729 }
730 Label::new(text, theme.cursor_position.clone()).boxed()
731 } else {
732 Empty::new().boxed()
733 }
734 }
735}
736
737impl StatusItemView for CursorPosition {
738 fn set_active_pane_item(
739 &mut self,
740 active_pane_item: Option<&dyn ItemHandle>,
741 cx: &mut ViewContext<Self>,
742 ) {
743 if let Some(editor) = active_pane_item.and_then(|item| item.downcast::<Editor>()) {
744 self._observe_active_editor = Some(cx.observe(&editor, Self::update_position));
745 self.update_position(editor, cx);
746 } else {
747 self.position = None;
748 self._observe_active_editor = None;
749 }
750
751 cx.notify();
752 }
753}
754
755fn path_for_buffer<'a>(
756 buffer: &ModelHandle<MultiBuffer>,
757 mut height: usize,
758 include_filename: bool,
759 cx: &'a AppContext,
760) -> Option<Cow<'a, Path>> {
761 let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
762 // Ensure we always render at least the filename.
763 height += 1;
764
765 let mut prefix = file.path().as_ref();
766 while height > 0 {
767 if let Some(parent) = prefix.parent() {
768 prefix = parent;
769 height -= 1;
770 } else {
771 break;
772 }
773 }
774
775 // Here we could have just always used `full_path`, but that is very
776 // allocation-heavy and so we try to use a `Cow<Path>` if we haven't
777 // traversed all the way up to the worktree's root.
778 if height > 0 {
779 let full_path = file.full_path(cx);
780 if include_filename {
781 Some(full_path.into())
782 } else {
783 Some(full_path.parent().unwrap().to_path_buf().into())
784 }
785 } else {
786 let mut path = file.path().strip_prefix(prefix).unwrap();
787 if !include_filename {
788 path = path.parent().unwrap();
789 }
790 Some(path.into())
791 }
792}