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 ToolbarItemLocation,
31};
32
33pub const FORMAT_TIMEOUT: Duration = Duration::from_secs(2);
34pub const MAX_TAB_TITLE_LEN: usize = 24;
35
36impl FollowableItem for Editor {
37 fn from_state_proto(
38 pane: ViewHandle<workspace::Pane>,
39 project: ModelHandle<Project>,
40 state: &mut Option<proto::view::Variant>,
41 cx: &mut MutableAppContext,
42 ) -> Option<Task<Result<ViewHandle<Self>>>> {
43 let state = if matches!(state, Some(proto::view::Variant::Editor(_))) {
44 if let Some(proto::view::Variant::Editor(state)) = state.take() {
45 state
46 } else {
47 unreachable!()
48 }
49 } else {
50 return None;
51 };
52
53 let buffer = project.update(cx, |project, cx| {
54 project.open_buffer_by_id(state.buffer_id, cx)
55 });
56 Some(cx.spawn(|mut cx| async move {
57 let buffer = buffer.await?;
58 let editor = pane
59 .read_with(&cx, |pane, cx| {
60 pane.items_of_type::<Self>().find(|editor| {
61 editor.read(cx).buffer.read(cx).as_singleton().as_ref() == Some(&buffer)
62 })
63 })
64 .unwrap_or_else(|| {
65 pane.update(&mut cx, |_, cx| {
66 cx.add_view(|cx| Editor::for_buffer(buffer, Some(project), cx))
67 })
68 });
69 editor.update(&mut cx, |editor, cx| {
70 let excerpt_id;
71 let buffer_id;
72 {
73 let buffer = editor.buffer.read(cx).read(cx);
74 let singleton = buffer.as_singleton().unwrap();
75 excerpt_id = singleton.0.clone();
76 buffer_id = singleton.1;
77 }
78 let selections = state
79 .selections
80 .into_iter()
81 .map(|selection| {
82 deserialize_selection(&excerpt_id, buffer_id, selection)
83 .ok_or_else(|| anyhow!("invalid selection"))
84 })
85 .collect::<Result<Vec<_>>>()?;
86 if !selections.is_empty() {
87 editor.set_selections_from_remote(selections, cx);
88 }
89
90 if let Some(anchor) = state.scroll_top_anchor {
91 editor.set_scroll_top_anchor(
92 Anchor {
93 buffer_id: Some(state.buffer_id as usize),
94 excerpt_id,
95 text_anchor: language::proto::deserialize_anchor(anchor)
96 .ok_or_else(|| anyhow!("invalid scroll top"))?,
97 },
98 vec2f(state.scroll_x, state.scroll_y),
99 cx,
100 );
101 }
102
103 Ok::<_, anyhow::Error>(())
104 })?;
105 Ok(editor)
106 }))
107 }
108
109 fn set_leader_replica_id(
110 &mut self,
111 leader_replica_id: Option<u16>,
112 cx: &mut ViewContext<Self>,
113 ) {
114 self.leader_replica_id = leader_replica_id;
115 if self.leader_replica_id.is_some() {
116 self.buffer.update(cx, |buffer, cx| {
117 buffer.remove_active_selections(cx);
118 });
119 } else {
120 self.buffer.update(cx, |buffer, cx| {
121 if self.focused {
122 buffer.set_active_selections(
123 &self.selections.disjoint_anchors(),
124 self.selections.line_mode,
125 cx,
126 );
127 }
128 });
129 }
130 cx.notify();
131 }
132
133 fn to_state_proto(&self, cx: &AppContext) -> Option<proto::view::Variant> {
134 let buffer_id = self.buffer.read(cx).as_singleton()?.read(cx).remote_id();
135 Some(proto::view::Variant::Editor(proto::view::Editor {
136 buffer_id,
137 scroll_top_anchor: Some(language::proto::serialize_anchor(
138 &self.scroll_top_anchor.text_anchor,
139 )),
140 scroll_x: self.scroll_position.x(),
141 scroll_y: self.scroll_position.y(),
142 selections: self
143 .selections
144 .disjoint_anchors()
145 .iter()
146 .map(serialize_selection)
147 .collect(),
148 }))
149 }
150
151 fn add_event_to_update_proto(
152 &self,
153 event: &Self::Event,
154 update: &mut Option<proto::update_view::Variant>,
155 _: &AppContext,
156 ) -> bool {
157 let update =
158 update.get_or_insert_with(|| proto::update_view::Variant::Editor(Default::default()));
159
160 match update {
161 proto::update_view::Variant::Editor(update) => match event {
162 Event::ScrollPositionChanged { .. } => {
163 update.scroll_top_anchor = Some(language::proto::serialize_anchor(
164 &self.scroll_top_anchor.text_anchor,
165 ));
166 update.scroll_x = self.scroll_position.x();
167 update.scroll_y = self.scroll_position.y();
168 true
169 }
170 Event::SelectionsChanged { .. } => {
171 update.selections = self
172 .selections
173 .disjoint_anchors()
174 .iter()
175 .chain(self.selections.pending_anchor().as_ref())
176 .map(serialize_selection)
177 .collect();
178 true
179 }
180 _ => false,
181 },
182 }
183 }
184
185 fn apply_update_proto(
186 &mut self,
187 message: update_view::Variant,
188 cx: &mut ViewContext<Self>,
189 ) -> Result<()> {
190 match message {
191 update_view::Variant::Editor(message) => {
192 let buffer = self.buffer.read(cx);
193 let buffer = buffer.read(cx);
194 let (excerpt_id, buffer_id, _) = buffer.as_singleton().unwrap();
195 let excerpt_id = excerpt_id.clone();
196 drop(buffer);
197
198 let selections = message
199 .selections
200 .into_iter()
201 .filter_map(|selection| {
202 deserialize_selection(&excerpt_id, buffer_id, selection)
203 })
204 .collect::<Vec<_>>();
205
206 if !selections.is_empty() {
207 self.set_selections_from_remote(selections, cx);
208 self.request_autoscroll_remotely(Autoscroll::Newest, cx);
209 } else if let Some(anchor) = message.scroll_top_anchor {
210 self.set_scroll_top_anchor(
211 Anchor {
212 buffer_id: Some(buffer_id),
213 excerpt_id,
214 text_anchor: language::proto::deserialize_anchor(anchor)
215 .ok_or_else(|| anyhow!("invalid scroll top"))?,
216 },
217 vec2f(message.scroll_x, message.scroll_y),
218 cx,
219 );
220 }
221 }
222 }
223 Ok(())
224 }
225
226 fn should_unfollow_on_event(event: &Self::Event, _: &AppContext) -> bool {
227 match event {
228 Event::Edited => true,
229 Event::SelectionsChanged { local } => *local,
230 Event::ScrollPositionChanged { local } => *local,
231 _ => false,
232 }
233 }
234}
235
236fn serialize_selection(selection: &Selection<Anchor>) -> proto::Selection {
237 proto::Selection {
238 id: selection.id as u64,
239 start: Some(language::proto::serialize_anchor(
240 &selection.start.text_anchor,
241 )),
242 end: Some(language::proto::serialize_anchor(
243 &selection.end.text_anchor,
244 )),
245 reversed: selection.reversed,
246 }
247}
248
249fn deserialize_selection(
250 excerpt_id: &ExcerptId,
251 buffer_id: usize,
252 selection: proto::Selection,
253) -> Option<Selection<Anchor>> {
254 Some(Selection {
255 id: selection.id as usize,
256 start: Anchor {
257 buffer_id: Some(buffer_id),
258 excerpt_id: excerpt_id.clone(),
259 text_anchor: language::proto::deserialize_anchor(selection.start?)?,
260 },
261 end: Anchor {
262 buffer_id: Some(buffer_id),
263 excerpt_id: excerpt_id.clone(),
264 text_anchor: language::proto::deserialize_anchor(selection.end?)?,
265 },
266 reversed: selection.reversed,
267 goal: SelectionGoal::None,
268 })
269}
270
271impl Item for Editor {
272 fn navigate(&mut self, data: Box<dyn std::any::Any>, cx: &mut ViewContext<Self>) -> bool {
273 if let Ok(data) = data.downcast::<NavigationData>() {
274 let newest_selection = self.selections.newest::<Point>(cx);
275 let buffer = self.buffer.read(cx).read(cx);
276 let offset = if buffer.can_resolve(&data.cursor_anchor) {
277 data.cursor_anchor.to_point(&buffer)
278 } else {
279 buffer.clip_point(data.cursor_position, Bias::Left)
280 };
281
282 let scroll_top_anchor = if buffer.can_resolve(&data.scroll_top_anchor) {
283 data.scroll_top_anchor
284 } else {
285 buffer.anchor_before(
286 buffer.clip_point(Point::new(data.scroll_top_row, 0), Bias::Left),
287 )
288 };
289
290 drop(buffer);
291
292 if newest_selection.head() == offset {
293 false
294 } else {
295 let nav_history = self.nav_history.take();
296 self.scroll_position = data.scroll_position;
297 self.scroll_top_anchor = scroll_top_anchor;
298 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
299 s.select_ranges([offset..offset])
300 });
301 self.nav_history = nav_history;
302 true
303 }
304 } else {
305 false
306 }
307 }
308
309 fn tab_description<'a>(&'a self, detail: usize, cx: &'a AppContext) -> Option<Cow<'a, str>> {
310 match path_for_buffer(&self.buffer, detail, true, cx)? {
311 Cow::Borrowed(path) => Some(path.to_string_lossy()),
312 Cow::Owned(path) => Some(path.to_string_lossy().to_string().into()),
313 }
314 }
315
316 fn tab_content(
317 &self,
318 detail: Option<usize>,
319 style: &theme::Tab,
320 cx: &AppContext,
321 ) -> ElementBox {
322 Flex::row()
323 .with_child(
324 Label::new(self.title(cx).into(), style.label.clone())
325 .aligned()
326 .boxed(),
327 )
328 .with_children(detail.and_then(|detail| {
329 let path = path_for_buffer(&self.buffer, detail, false, cx)?;
330 let description = path.to_string_lossy();
331 Some(
332 Label::new(
333 if description.len() > MAX_TAB_TITLE_LEN {
334 description[..MAX_TAB_TITLE_LEN].to_string() + "…"
335 } else {
336 description.into()
337 },
338 style.description.text.clone(),
339 )
340 .contained()
341 .with_style(style.description.container)
342 .aligned()
343 .boxed(),
344 )
345 }))
346 .boxed()
347 }
348
349 fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
350 let buffer = self.buffer.read(cx).as_singleton()?;
351 let file = buffer.read(cx).file();
352 File::from_dyn(file).map(|file| ProjectPath {
353 worktree_id: file.worktree_id(cx),
354 path: file.path().clone(),
355 })
356 }
357
358 fn project_entry_ids(&self, cx: &AppContext) -> SmallVec<[ProjectEntryId; 3]> {
359 self.buffer
360 .read(cx)
361 .files(cx)
362 .into_iter()
363 .filter_map(|file| File::from_dyn(Some(file))?.project_entry_id(cx))
364 .collect()
365 }
366
367 fn is_singleton(&self, cx: &AppContext) -> bool {
368 self.buffer.read(cx).is_singleton()
369 }
370
371 fn clone_on_split(&self, cx: &mut ViewContext<Self>) -> Option<Self>
372 where
373 Self: Sized,
374 {
375 Some(self.clone(cx))
376 }
377
378 fn set_nav_history(&mut self, history: ItemNavHistory, _: &mut ViewContext<Self>) {
379 self.nav_history = Some(history);
380 }
381
382 fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
383 let selection = self.selections.newest_anchor();
384 self.push_to_nav_history(selection.head(), None, cx);
385 }
386
387 fn workspace_deactivated(&mut self, cx: &mut ViewContext<Self>) {
388 hide_link_definition(self, cx);
389 self.link_go_to_definition_state.last_mouse_location = None;
390 }
391
392 fn is_dirty(&self, cx: &AppContext) -> bool {
393 self.buffer().read(cx).read(cx).is_dirty()
394 }
395
396 fn has_conflict(&self, cx: &AppContext) -> bool {
397 self.buffer().read(cx).read(cx).has_conflict()
398 }
399
400 fn can_save(&self, cx: &AppContext) -> bool {
401 !self.buffer().read(cx).is_singleton() || self.project_path(cx).is_some()
402 }
403
404 fn save(
405 &mut self,
406 project: ModelHandle<Project>,
407 cx: &mut ViewContext<Self>,
408 ) -> Task<Result<()>> {
409 let buffer = self.buffer().clone();
410 let buffers = buffer.read(cx).all_buffers();
411 let mut timeout = cx.background().timer(FORMAT_TIMEOUT).fuse();
412 let format = project.update(cx, |project, cx| project.format(buffers, true, cx));
413 self.report_event("save editor", cx);
414 cx.spawn(|_, mut cx| async move {
415 let transaction = futures::select_biased! {
416 _ = timeout => {
417 log::warn!("timed out waiting for formatting");
418 None
419 }
420 transaction = format.log_err().fuse() => transaction,
421 };
422
423 buffer
424 .update(&mut cx, |buffer, cx| {
425 if let Some(transaction) = transaction {
426 if !buffer.is_singleton() {
427 buffer.push_transaction(&transaction.0);
428 }
429 }
430
431 buffer.save(cx)
432 })
433 .await?;
434 Ok(())
435 })
436 }
437
438 fn save_as(
439 &mut self,
440 project: ModelHandle<Project>,
441 abs_path: PathBuf,
442 cx: &mut ViewContext<Self>,
443 ) -> Task<Result<()>> {
444 let buffer = self
445 .buffer()
446 .read(cx)
447 .as_singleton()
448 .expect("cannot call save_as on an excerpt list");
449
450 project.update(cx, |project, cx| {
451 project.save_buffer_as(buffer, abs_path, cx)
452 })
453 }
454
455 fn reload(
456 &mut self,
457 project: ModelHandle<Project>,
458 cx: &mut ViewContext<Self>,
459 ) -> Task<Result<()>> {
460 let buffer = self.buffer().clone();
461 let buffers = self.buffer.read(cx).all_buffers();
462 let reload_buffers =
463 project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
464 cx.spawn(|this, mut cx| async move {
465 let transaction = reload_buffers.log_err().await;
466 this.update(&mut cx, |editor, cx| {
467 editor.request_autoscroll(Autoscroll::Fit, cx)
468 });
469 buffer.update(&mut cx, |buffer, _| {
470 if let Some(transaction) = transaction {
471 if !buffer.is_singleton() {
472 buffer.push_transaction(&transaction.0);
473 }
474 }
475 });
476 Ok(())
477 })
478 }
479
480 fn to_item_events(event: &Self::Event) -> Vec<workspace::ItemEvent> {
481 let mut result = Vec::new();
482 match event {
483 Event::Closed => result.push(ItemEvent::CloseItem),
484 Event::Saved | Event::TitleChanged => {
485 result.push(ItemEvent::UpdateTab);
486 result.push(ItemEvent::UpdateBreadcrumbs);
487 }
488 Event::Reparsed => {
489 result.push(ItemEvent::UpdateBreadcrumbs);
490 }
491 Event::SelectionsChanged { local } if *local => {
492 result.push(ItemEvent::UpdateBreadcrumbs);
493 }
494 Event::DirtyChanged => {
495 result.push(ItemEvent::UpdateTab);
496 }
497 Event::BufferEdited => {
498 result.push(ItemEvent::Edit);
499 result.push(ItemEvent::UpdateBreadcrumbs);
500 }
501 _ => {}
502 }
503 result
504 }
505
506 fn as_searchable(&self, handle: &ViewHandle<Self>) -> Option<Box<dyn SearchableItemHandle>> {
507 Some(Box::new(handle.clone()))
508 }
509
510 fn breadcrumb_location(&self) -> ToolbarItemLocation {
511 ToolbarItemLocation::PrimaryLeft { flex: None }
512 }
513
514 fn breadcrumbs(&self, theme: &theme::Theme, cx: &AppContext) -> Option<Vec<ElementBox>> {
515 let cursor = self.selections.newest_anchor().head();
516 let multibuffer = &self.buffer().read(cx);
517 let (buffer_id, symbols) =
518 multibuffer.symbols_containing(cursor, Some(&theme.editor.syntax), cx)?;
519 let buffer = multibuffer.buffer(buffer_id)?;
520
521 let buffer = buffer.read(cx);
522 let filename = if let Some(file) = buffer.file() {
523 if file.path().file_name().is_none()
524 || self
525 .project
526 .as_ref()
527 .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
528 .unwrap_or_default()
529 {
530 file.full_path(cx).to_string_lossy().to_string()
531 } else {
532 file.path().to_string_lossy().to_string()
533 }
534 } else {
535 "untitled".to_string()
536 };
537
538 let mut breadcrumbs = vec![Label::new(filename, theme.breadcrumbs.text.clone()).boxed()];
539 breadcrumbs.extend(symbols.into_iter().map(|symbol| {
540 Text::new(symbol.text, theme.breadcrumbs.text.clone())
541 .with_highlights(symbol.highlight_ranges)
542 .boxed()
543 }));
544 Some(breadcrumbs)
545 }
546}
547
548impl ProjectItem for Editor {
549 type Item = Buffer;
550
551 fn for_project_item(
552 project: ModelHandle<Project>,
553 buffer: ModelHandle<Buffer>,
554 cx: &mut ViewContext<Self>,
555 ) -> Self {
556 Self::for_buffer(buffer, Some(project), cx)
557 }
558}
559
560enum BufferSearchHighlights {}
561impl SearchableItem for Editor {
562 type Match = Range<Anchor>;
563
564 fn to_search_event(event: &Self::Event) -> Option<SearchEvent> {
565 match event {
566 Event::BufferEdited => Some(SearchEvent::MatchesInvalidated),
567 Event::SelectionsChanged { .. } => Some(SearchEvent::ActiveMatchChanged),
568 _ => None,
569 }
570 }
571
572 fn clear_matches(&mut self, cx: &mut ViewContext<Self>) {
573 self.clear_background_highlights::<BufferSearchHighlights>(cx);
574 }
575
576 fn update_matches(&mut self, matches: Vec<Range<Anchor>>, cx: &mut ViewContext<Self>) {
577 self.highlight_background::<BufferSearchHighlights>(
578 matches,
579 |theme| theme.search.match_background,
580 cx,
581 );
582 }
583
584 fn query_suggestion(&mut self, cx: &mut ViewContext<Self>) -> String {
585 let display_map = self.snapshot(cx).display_snapshot;
586 let selection = self.selections.newest::<usize>(cx);
587 if selection.start == selection.end {
588 let point = selection.start.to_display_point(&display_map);
589 let range = surrounding_word(&display_map, point);
590 let range = range.start.to_offset(&display_map, Bias::Left)
591 ..range.end.to_offset(&display_map, Bias::Right);
592 let text: String = display_map.buffer_snapshot.text_for_range(range).collect();
593 if text.trim().is_empty() {
594 String::new()
595 } else {
596 text
597 }
598 } else {
599 display_map
600 .buffer_snapshot
601 .text_for_range(selection.start..selection.end)
602 .collect()
603 }
604 }
605
606 fn activate_match(
607 &mut self,
608 index: usize,
609 matches: Vec<Range<Anchor>>,
610 cx: &mut ViewContext<Self>,
611 ) {
612 self.unfold_ranges([matches[index].clone()], false, cx);
613 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
614 s.select_ranges([matches[index].clone()])
615 });
616 }
617
618 fn match_index_for_direction(
619 &mut self,
620 matches: &Vec<Range<Anchor>>,
621 mut current_index: usize,
622 direction: Direction,
623 cx: &mut ViewContext<Self>,
624 ) -> usize {
625 let buffer = self.buffer().read(cx).snapshot(cx);
626 let cursor = self.selections.newest_anchor().head();
627 if matches[current_index].start.cmp(&cursor, &buffer).is_gt() {
628 if direction == Direction::Prev {
629 if current_index == 0 {
630 current_index = matches.len() - 1;
631 } else {
632 current_index -= 1;
633 }
634 }
635 } else if matches[current_index].end.cmp(&cursor, &buffer).is_lt() {
636 if direction == Direction::Next {
637 current_index = 0;
638 }
639 } else if direction == Direction::Prev {
640 if current_index == 0 {
641 current_index = matches.len() - 1;
642 } else {
643 current_index -= 1;
644 }
645 } else if direction == Direction::Next {
646 if current_index == matches.len() - 1 {
647 current_index = 0
648 } else {
649 current_index += 1;
650 }
651 };
652 current_index
653 }
654
655 fn find_matches(
656 &mut self,
657 query: project::search::SearchQuery,
658 cx: &mut ViewContext<Self>,
659 ) -> Task<Vec<Range<Anchor>>> {
660 let buffer = self.buffer().read(cx).snapshot(cx);
661 cx.background().spawn(async move {
662 let mut ranges = Vec::new();
663 if let Some((_, _, excerpt_buffer)) = buffer.as_singleton() {
664 ranges.extend(
665 query
666 .search(excerpt_buffer.as_rope())
667 .await
668 .into_iter()
669 .map(|range| {
670 buffer.anchor_after(range.start)..buffer.anchor_before(range.end)
671 }),
672 );
673 } else {
674 for excerpt in buffer.excerpt_boundaries_in_range(0..buffer.len()) {
675 let excerpt_range = excerpt.range.context.to_offset(&excerpt.buffer);
676 let rope = excerpt.buffer.as_rope().slice(excerpt_range.clone());
677 ranges.extend(query.search(&rope).await.into_iter().map(|range| {
678 let start = excerpt
679 .buffer
680 .anchor_after(excerpt_range.start + range.start);
681 let end = excerpt
682 .buffer
683 .anchor_before(excerpt_range.start + range.end);
684 buffer.anchor_in_excerpt(excerpt.id.clone(), start)
685 ..buffer.anchor_in_excerpt(excerpt.id.clone(), end)
686 }));
687 }
688 }
689 ranges
690 })
691 }
692
693 fn active_match_index(
694 &mut self,
695 matches: Vec<Range<Anchor>>,
696 cx: &mut ViewContext<Self>,
697 ) -> Option<usize> {
698 active_match_index(
699 &matches,
700 &self.selections.newest_anchor().head(),
701 &self.buffer().read(cx).snapshot(cx),
702 )
703 }
704}
705
706pub fn active_match_index(
707 ranges: &[Range<Anchor>],
708 cursor: &Anchor,
709 buffer: &MultiBufferSnapshot,
710) -> Option<usize> {
711 if ranges.is_empty() {
712 None
713 } else {
714 match ranges.binary_search_by(|probe| {
715 if probe.end.cmp(cursor, &*buffer).is_lt() {
716 Ordering::Less
717 } else if probe.start.cmp(cursor, &*buffer).is_gt() {
718 Ordering::Greater
719 } else {
720 Ordering::Equal
721 }
722 }) {
723 Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
724 }
725 }
726}
727
728pub struct CursorPosition {
729 position: Option<Point>,
730 selected_count: usize,
731 _observe_active_editor: Option<Subscription>,
732}
733
734impl Default for CursorPosition {
735 fn default() -> Self {
736 Self::new()
737 }
738}
739
740impl CursorPosition {
741 pub fn new() -> Self {
742 Self {
743 position: None,
744 selected_count: 0,
745 _observe_active_editor: None,
746 }
747 }
748
749 fn update_position(&mut self, editor: ViewHandle<Editor>, cx: &mut ViewContext<Self>) {
750 let editor = editor.read(cx);
751 let buffer = editor.buffer().read(cx).snapshot(cx);
752
753 self.selected_count = 0;
754 let mut last_selection: Option<Selection<usize>> = None;
755 for selection in editor.selections.all::<usize>(cx) {
756 self.selected_count += selection.end - selection.start;
757 if last_selection
758 .as_ref()
759 .map_or(true, |last_selection| selection.id > last_selection.id)
760 {
761 last_selection = Some(selection);
762 }
763 }
764 self.position = last_selection.map(|s| s.head().to_point(&buffer));
765
766 cx.notify();
767 }
768}
769
770impl Entity for CursorPosition {
771 type Event = ();
772}
773
774impl View for CursorPosition {
775 fn ui_name() -> &'static str {
776 "CursorPosition"
777 }
778
779 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
780 if let Some(position) = self.position {
781 let theme = &cx.global::<Settings>().theme.workspace.status_bar;
782 let mut text = format!("{},{}", position.row + 1, position.column + 1);
783 if self.selected_count > 0 {
784 write!(text, " ({} selected)", self.selected_count).unwrap();
785 }
786 Label::new(text, theme.cursor_position.clone()).boxed()
787 } else {
788 Empty::new().boxed()
789 }
790 }
791}
792
793impl StatusItemView for CursorPosition {
794 fn set_active_pane_item(
795 &mut self,
796 active_pane_item: Option<&dyn ItemHandle>,
797 cx: &mut ViewContext<Self>,
798 ) {
799 if let Some(editor) = active_pane_item.and_then(|item| item.downcast::<Editor>()) {
800 self._observe_active_editor = Some(cx.observe(&editor, Self::update_position));
801 self.update_position(editor, cx);
802 } else {
803 self.position = None;
804 self._observe_active_editor = None;
805 }
806
807 cx.notify();
808 }
809}
810
811fn path_for_buffer<'a>(
812 buffer: &ModelHandle<MultiBuffer>,
813 mut height: usize,
814 include_filename: bool,
815 cx: &'a AppContext,
816) -> Option<Cow<'a, Path>> {
817 let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
818 // Ensure we always render at least the filename.
819 height += 1;
820
821 let mut prefix = file.path().as_ref();
822 while height > 0 {
823 if let Some(parent) = prefix.parent() {
824 prefix = parent;
825 height -= 1;
826 } else {
827 break;
828 }
829 }
830
831 // Here we could have just always used `full_path`, but that is very
832 // allocation-heavy and so we try to use a `Cow<Path>` if we haven't
833 // traversed all the way up to the worktree's root.
834 if height > 0 {
835 let full_path = file.full_path(cx);
836 if include_filename {
837 Some(full_path.into())
838 } else {
839 Some(full_path.parent().unwrap().to_path_buf().into())
840 }
841 } else {
842 let mut path = file.path().strip_prefix(prefix).unwrap();
843 if !include_filename {
844 path = path.parent().unwrap();
845 }
846 Some(path.into())
847 }
848}