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 _, FORMAT_TIMEOUT,
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, FormatTrigger, 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};
24use text::{Point, Selection};
25use util::TryFutureExt;
26use workspace::{
27 searchable::{Direction, SearchEvent, SearchableItem, SearchableItemHandle},
28 FollowableItem, Item, ItemEvent, ItemHandle, ItemNavHistory, ProjectItem, StatusItemView,
29 ToolbarItemLocation,
30};
31
32pub const MAX_TAB_TITLE_LEN: usize = 24;
33
34impl FollowableItem for Editor {
35 fn from_state_proto(
36 pane: ViewHandle<workspace::Pane>,
37 project: ModelHandle<Project>,
38 state: &mut Option<proto::view::Variant>,
39 cx: &mut MutableAppContext,
40 ) -> Option<Task<Result<ViewHandle<Self>>>> {
41 let state = if matches!(state, Some(proto::view::Variant::Editor(_))) {
42 if let Some(proto::view::Variant::Editor(state)) = state.take() {
43 state
44 } else {
45 unreachable!()
46 }
47 } else {
48 return None;
49 };
50
51 let buffer = project.update(cx, |project, cx| {
52 project.open_buffer_by_id(state.buffer_id, cx)
53 });
54 Some(cx.spawn(|mut cx| async move {
55 let buffer = buffer.await?;
56 let editor = pane
57 .read_with(&cx, |pane, cx| {
58 pane.items_of_type::<Self>().find(|editor| {
59 editor.read(cx).buffer.read(cx).as_singleton().as_ref() == Some(&buffer)
60 })
61 })
62 .unwrap_or_else(|| {
63 pane.update(&mut cx, |_, cx| {
64 cx.add_view(|cx| Editor::for_buffer(buffer, Some(project), cx))
65 })
66 });
67 editor.update(&mut cx, |editor, cx| {
68 let excerpt_id;
69 let buffer_id;
70 {
71 let buffer = editor.buffer.read(cx).read(cx);
72 let singleton = buffer.as_singleton().unwrap();
73 excerpt_id = singleton.0.clone();
74 buffer_id = singleton.1;
75 }
76 let selections = state
77 .selections
78 .into_iter()
79 .map(|selection| {
80 deserialize_selection(&excerpt_id, buffer_id, selection)
81 .ok_or_else(|| anyhow!("invalid selection"))
82 })
83 .collect::<Result<Vec<_>>>()?;
84 if !selections.is_empty() {
85 editor.set_selections_from_remote(selections, cx);
86 }
87
88 if let Some(anchor) = state.scroll_top_anchor {
89 editor.set_scroll_top_anchor(
90 Anchor {
91 buffer_id: Some(state.buffer_id as usize),
92 excerpt_id,
93 text_anchor: language::proto::deserialize_anchor(anchor)
94 .ok_or_else(|| anyhow!("invalid scroll top"))?,
95 },
96 vec2f(state.scroll_x, state.scroll_y),
97 cx,
98 );
99 }
100
101 Ok::<_, anyhow::Error>(())
102 })?;
103 Ok(editor)
104 }))
105 }
106
107 fn set_leader_replica_id(
108 &mut self,
109 leader_replica_id: Option<u16>,
110 cx: &mut ViewContext<Self>,
111 ) {
112 self.leader_replica_id = leader_replica_id;
113 if self.leader_replica_id.is_some() {
114 self.buffer.update(cx, |buffer, cx| {
115 buffer.remove_active_selections(cx);
116 });
117 } else {
118 self.buffer.update(cx, |buffer, cx| {
119 if self.focused {
120 buffer.set_active_selections(
121 &self.selections.disjoint_anchors(),
122 self.selections.line_mode,
123 cx,
124 );
125 }
126 });
127 }
128 cx.notify();
129 }
130
131 fn to_state_proto(&self, cx: &AppContext) -> Option<proto::view::Variant> {
132 let buffer_id = self.buffer.read(cx).as_singleton()?.read(cx).remote_id();
133 Some(proto::view::Variant::Editor(proto::view::Editor {
134 buffer_id,
135 scroll_top_anchor: Some(language::proto::serialize_anchor(
136 &self.scroll_top_anchor.text_anchor,
137 )),
138 scroll_x: self.scroll_position.x(),
139 scroll_y: self.scroll_position.y(),
140 selections: self
141 .selections
142 .disjoint_anchors()
143 .iter()
144 .map(serialize_selection)
145 .collect(),
146 }))
147 }
148
149 fn add_event_to_update_proto(
150 &self,
151 event: &Self::Event,
152 update: &mut Option<proto::update_view::Variant>,
153 _: &AppContext,
154 ) -> bool {
155 let update =
156 update.get_or_insert_with(|| proto::update_view::Variant::Editor(Default::default()));
157
158 match update {
159 proto::update_view::Variant::Editor(update) => match event {
160 Event::ScrollPositionChanged { .. } => {
161 update.scroll_top_anchor = Some(language::proto::serialize_anchor(
162 &self.scroll_top_anchor.text_anchor,
163 ));
164 update.scroll_x = self.scroll_position.x();
165 update.scroll_y = self.scroll_position.y();
166 true
167 }
168 Event::SelectionsChanged { .. } => {
169 update.selections = self
170 .selections
171 .disjoint_anchors()
172 .iter()
173 .chain(self.selections.pending_anchor().as_ref())
174 .map(serialize_selection)
175 .collect();
176 true
177 }
178 _ => false,
179 },
180 }
181 }
182
183 fn apply_update_proto(
184 &mut self,
185 message: update_view::Variant,
186 cx: &mut ViewContext<Self>,
187 ) -> Result<()> {
188 match message {
189 update_view::Variant::Editor(message) => {
190 let buffer = self.buffer.read(cx);
191 let buffer = buffer.read(cx);
192 let (excerpt_id, buffer_id, _) = buffer.as_singleton().unwrap();
193 let excerpt_id = excerpt_id.clone();
194 drop(buffer);
195
196 let selections = message
197 .selections
198 .into_iter()
199 .filter_map(|selection| {
200 deserialize_selection(&excerpt_id, buffer_id, selection)
201 })
202 .collect::<Vec<_>>();
203
204 if !selections.is_empty() {
205 self.set_selections_from_remote(selections, cx);
206 self.request_autoscroll_remotely(Autoscroll::Newest, cx);
207 } else if let Some(anchor) = message.scroll_top_anchor {
208 self.set_scroll_top_anchor(
209 Anchor {
210 buffer_id: Some(buffer_id),
211 excerpt_id,
212 text_anchor: language::proto::deserialize_anchor(anchor)
213 .ok_or_else(|| anyhow!("invalid scroll top"))?,
214 },
215 vec2f(message.scroll_x, message.scroll_y),
216 cx,
217 );
218 }
219 }
220 }
221 Ok(())
222 }
223
224 fn should_unfollow_on_event(event: &Self::Event, _: &AppContext) -> bool {
225 match event {
226 Event::Edited => true,
227 Event::SelectionsChanged { local } => *local,
228 Event::ScrollPositionChanged { local } => *local,
229 _ => false,
230 }
231 }
232}
233
234fn serialize_selection(selection: &Selection<Anchor>) -> proto::Selection {
235 proto::Selection {
236 id: selection.id as u64,
237 start: Some(language::proto::serialize_anchor(
238 &selection.start.text_anchor,
239 )),
240 end: Some(language::proto::serialize_anchor(
241 &selection.end.text_anchor,
242 )),
243 reversed: selection.reversed,
244 }
245}
246
247fn deserialize_selection(
248 excerpt_id: &ExcerptId,
249 buffer_id: usize,
250 selection: proto::Selection,
251) -> Option<Selection<Anchor>> {
252 Some(Selection {
253 id: selection.id as usize,
254 start: Anchor {
255 buffer_id: Some(buffer_id),
256 excerpt_id: excerpt_id.clone(),
257 text_anchor: language::proto::deserialize_anchor(selection.start?)?,
258 },
259 end: Anchor {
260 buffer_id: Some(buffer_id),
261 excerpt_id: excerpt_id.clone(),
262 text_anchor: language::proto::deserialize_anchor(selection.end?)?,
263 },
264 reversed: selection.reversed,
265 goal: SelectionGoal::None,
266 })
267}
268
269impl Item for Editor {
270 fn navigate(&mut self, data: Box<dyn std::any::Any>, cx: &mut ViewContext<Self>) -> bool {
271 if let Ok(data) = data.downcast::<NavigationData>() {
272 let newest_selection = self.selections.newest::<Point>(cx);
273 let buffer = self.buffer.read(cx).read(cx);
274 let offset = if buffer.can_resolve(&data.cursor_anchor) {
275 data.cursor_anchor.to_point(&buffer)
276 } else {
277 buffer.clip_point(data.cursor_position, Bias::Left)
278 };
279
280 let scroll_top_anchor = if buffer.can_resolve(&data.scroll_top_anchor) {
281 data.scroll_top_anchor
282 } else {
283 buffer.anchor_before(
284 buffer.clip_point(Point::new(data.scroll_top_row, 0), Bias::Left),
285 )
286 };
287
288 drop(buffer);
289
290 if newest_selection.head() == offset {
291 false
292 } else {
293 let nav_history = self.nav_history.take();
294 self.scroll_position = data.scroll_position;
295 self.scroll_top_anchor = scroll_top_anchor;
296 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
297 s.select_ranges([offset..offset])
298 });
299 self.nav_history = nav_history;
300 true
301 }
302 } else {
303 false
304 }
305 }
306
307 fn tab_description<'a>(&'a self, detail: usize, cx: &'a AppContext) -> Option<Cow<'a, str>> {
308 match path_for_buffer(&self.buffer, detail, true, cx)? {
309 Cow::Borrowed(path) => Some(path.to_string_lossy()),
310 Cow::Owned(path) => Some(path.to_string_lossy().to_string().into()),
311 }
312 }
313
314 fn tab_content(
315 &self,
316 detail: Option<usize>,
317 style: &theme::Tab,
318 cx: &AppContext,
319 ) -> ElementBox {
320 Flex::row()
321 .with_child(
322 Label::new(self.title(cx).into(), style.label.clone())
323 .aligned()
324 .boxed(),
325 )
326 .with_children(detail.and_then(|detail| {
327 let path = path_for_buffer(&self.buffer, detail, false, cx)?;
328 let description = path.to_string_lossy();
329 Some(
330 Label::new(
331 if description.len() > MAX_TAB_TITLE_LEN {
332 description[..MAX_TAB_TITLE_LEN].to_string() + "…"
333 } else {
334 description.into()
335 },
336 style.description.text.clone(),
337 )
338 .contained()
339 .with_style(style.description.container)
340 .aligned()
341 .boxed(),
342 )
343 }))
344 .boxed()
345 }
346
347 fn project_path(&self, cx: &AppContext) -> Option<ProjectPath> {
348 let buffer = self.buffer.read(cx).as_singleton()?;
349 let file = buffer.read(cx).file();
350 File::from_dyn(file).map(|file| ProjectPath {
351 worktree_id: file.worktree_id(cx),
352 path: file.path().clone(),
353 })
354 }
355
356 fn project_entry_ids(&self, cx: &AppContext) -> SmallVec<[ProjectEntryId; 3]> {
357 self.buffer
358 .read(cx)
359 .files(cx)
360 .into_iter()
361 .filter_map(|file| File::from_dyn(Some(file))?.project_entry_id(cx))
362 .collect()
363 }
364
365 fn is_singleton(&self, cx: &AppContext) -> bool {
366 self.buffer.read(cx).is_singleton()
367 }
368
369 fn clone_on_split(&self, cx: &mut ViewContext<Self>) -> Option<Self>
370 where
371 Self: Sized,
372 {
373 Some(self.clone(cx))
374 }
375
376 fn set_nav_history(&mut self, history: ItemNavHistory, _: &mut ViewContext<Self>) {
377 self.nav_history = Some(history);
378 }
379
380 fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
381 let selection = self.selections.newest_anchor();
382 self.push_to_nav_history(selection.head(), None, cx);
383 }
384
385 fn workspace_deactivated(&mut self, cx: &mut ViewContext<Self>) {
386 hide_link_definition(self, cx);
387 self.link_go_to_definition_state.last_mouse_location = None;
388 }
389
390 fn is_dirty(&self, cx: &AppContext) -> bool {
391 self.buffer().read(cx).read(cx).is_dirty()
392 }
393
394 fn has_conflict(&self, cx: &AppContext) -> bool {
395 self.buffer().read(cx).read(cx).has_conflict()
396 }
397
398 fn can_save(&self, cx: &AppContext) -> bool {
399 !self.buffer().read(cx).is_singleton() || self.project_path(cx).is_some()
400 }
401
402 fn save(
403 &mut self,
404 project: ModelHandle<Project>,
405 cx: &mut ViewContext<Self>,
406 ) -> Task<Result<()>> {
407 self.report_event("save editor", cx);
408
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| {
413 project.format(buffers, true, FormatTrigger::Save, cx)
414 });
415 cx.spawn(|_, mut cx| async move {
416 let transaction = futures::select_biased! {
417 _ = timeout => {
418 log::warn!("timed out waiting for formatting");
419 None
420 }
421 transaction = format.log_err().fuse() => transaction,
422 };
423
424 buffer
425 .update(&mut cx, |buffer, cx| {
426 if let Some(transaction) = transaction {
427 if !buffer.is_singleton() {
428 buffer.push_transaction(&transaction.0);
429 }
430 }
431
432 buffer.save(cx)
433 })
434 .await?;
435 Ok(())
436 })
437 }
438
439 fn save_as(
440 &mut self,
441 project: ModelHandle<Project>,
442 abs_path: PathBuf,
443 cx: &mut ViewContext<Self>,
444 ) -> Task<Result<()>> {
445 let buffer = self
446 .buffer()
447 .read(cx)
448 .as_singleton()
449 .expect("cannot call save_as on an excerpt list");
450
451 project.update(cx, |project, cx| {
452 project.save_buffer_as(buffer, abs_path, cx)
453 })
454 }
455
456 fn reload(
457 &mut self,
458 project: ModelHandle<Project>,
459 cx: &mut ViewContext<Self>,
460 ) -> Task<Result<()>> {
461 let buffer = self.buffer().clone();
462 let buffers = self.buffer.read(cx).all_buffers();
463 let reload_buffers =
464 project.update(cx, |project, cx| project.reload_buffers(buffers, true, cx));
465 cx.spawn(|this, mut cx| async move {
466 let transaction = reload_buffers.log_err().await;
467 this.update(&mut cx, |editor, cx| {
468 editor.request_autoscroll(Autoscroll::Fit, cx)
469 });
470 buffer.update(&mut cx, |buffer, _| {
471 if let Some(transaction) = transaction {
472 if !buffer.is_singleton() {
473 buffer.push_transaction(&transaction.0);
474 }
475 }
476 });
477 Ok(())
478 })
479 }
480
481 fn to_item_events(event: &Self::Event) -> Vec<workspace::ItemEvent> {
482 let mut result = Vec::new();
483 match event {
484 Event::Closed => result.push(ItemEvent::CloseItem),
485 Event::Saved | Event::TitleChanged => {
486 result.push(ItemEvent::UpdateTab);
487 result.push(ItemEvent::UpdateBreadcrumbs);
488 }
489 Event::Reparsed => {
490 result.push(ItemEvent::UpdateBreadcrumbs);
491 }
492 Event::SelectionsChanged { local } if *local => {
493 result.push(ItemEvent::UpdateBreadcrumbs);
494 }
495 Event::DirtyChanged => {
496 result.push(ItemEvent::UpdateTab);
497 }
498 Event::BufferEdited => {
499 result.push(ItemEvent::Edit);
500 result.push(ItemEvent::UpdateBreadcrumbs);
501 }
502 _ => {}
503 }
504 result
505 }
506
507 fn as_searchable(&self, handle: &ViewHandle<Self>) -> Option<Box<dyn SearchableItemHandle>> {
508 Some(Box::new(handle.clone()))
509 }
510
511 fn breadcrumb_location(&self) -> ToolbarItemLocation {
512 ToolbarItemLocation::PrimaryLeft { flex: None }
513 }
514
515 fn breadcrumbs(&self, theme: &theme::Theme, cx: &AppContext) -> Option<Vec<ElementBox>> {
516 let cursor = self.selections.newest_anchor().head();
517 let multibuffer = &self.buffer().read(cx);
518 let (buffer_id, symbols) =
519 multibuffer.symbols_containing(cursor, Some(&theme.editor.syntax), cx)?;
520 let buffer = multibuffer.buffer(buffer_id)?;
521
522 let buffer = buffer.read(cx);
523 let filename = if let Some(file) = buffer.file() {
524 if file.path().file_name().is_none()
525 || self
526 .project
527 .as_ref()
528 .map(|project| project.read(cx).visible_worktrees(cx).count() > 1)
529 .unwrap_or_default()
530 {
531 file.full_path(cx).to_string_lossy().to_string()
532 } else {
533 file.path().to_string_lossy().to_string()
534 }
535 } else {
536 "untitled".to_string()
537 };
538
539 let mut breadcrumbs = vec![Label::new(filename, theme.breadcrumbs.text.clone()).boxed()];
540 breadcrumbs.extend(symbols.into_iter().map(|symbol| {
541 Text::new(symbol.text, theme.breadcrumbs.text.clone())
542 .with_highlights(symbol.highlight_ranges)
543 .boxed()
544 }));
545 Some(breadcrumbs)
546 }
547}
548
549impl ProjectItem for Editor {
550 type Item = Buffer;
551
552 fn for_project_item(
553 project: ModelHandle<Project>,
554 buffer: ModelHandle<Buffer>,
555 cx: &mut ViewContext<Self>,
556 ) -> Self {
557 Self::for_buffer(buffer, Some(project), cx)
558 }
559}
560
561enum BufferSearchHighlights {}
562impl SearchableItem for Editor {
563 type Match = Range<Anchor>;
564
565 fn to_search_event(event: &Self::Event) -> Option<SearchEvent> {
566 match event {
567 Event::BufferEdited => Some(SearchEvent::MatchesInvalidated),
568 Event::SelectionsChanged { .. } => Some(SearchEvent::ActiveMatchChanged),
569 _ => None,
570 }
571 }
572
573 fn clear_matches(&mut self, cx: &mut ViewContext<Self>) {
574 self.clear_background_highlights::<BufferSearchHighlights>(cx);
575 }
576
577 fn update_matches(&mut self, matches: Vec<Range<Anchor>>, cx: &mut ViewContext<Self>) {
578 self.highlight_background::<BufferSearchHighlights>(
579 matches,
580 |theme| theme.search.match_background,
581 cx,
582 );
583 }
584
585 fn query_suggestion(&mut self, cx: &mut ViewContext<Self>) -> String {
586 let display_map = self.snapshot(cx).display_snapshot;
587 let selection = self.selections.newest::<usize>(cx);
588 if selection.start == selection.end {
589 let point = selection.start.to_display_point(&display_map);
590 let range = surrounding_word(&display_map, point);
591 let range = range.start.to_offset(&display_map, Bias::Left)
592 ..range.end.to_offset(&display_map, Bias::Right);
593 let text: String = display_map.buffer_snapshot.text_for_range(range).collect();
594 if text.trim().is_empty() {
595 String::new()
596 } else {
597 text
598 }
599 } else {
600 display_map
601 .buffer_snapshot
602 .text_for_range(selection.start..selection.end)
603 .collect()
604 }
605 }
606
607 fn activate_match(
608 &mut self,
609 index: usize,
610 matches: Vec<Range<Anchor>>,
611 cx: &mut ViewContext<Self>,
612 ) {
613 self.unfold_ranges([matches[index].clone()], false, cx);
614 self.change_selections(Some(Autoscroll::Fit), cx, |s| {
615 s.select_ranges([matches[index].clone()])
616 });
617 }
618
619 fn match_index_for_direction(
620 &mut self,
621 matches: &Vec<Range<Anchor>>,
622 mut current_index: usize,
623 direction: Direction,
624 cx: &mut ViewContext<Self>,
625 ) -> usize {
626 let buffer = self.buffer().read(cx).snapshot(cx);
627 let cursor = self.selections.newest_anchor().head();
628 if matches[current_index].start.cmp(&cursor, &buffer).is_gt() {
629 if direction == Direction::Prev {
630 if current_index == 0 {
631 current_index = matches.len() - 1;
632 } else {
633 current_index -= 1;
634 }
635 }
636 } else if matches[current_index].end.cmp(&cursor, &buffer).is_lt() {
637 if direction == Direction::Next {
638 current_index = 0;
639 }
640 } else if direction == Direction::Prev {
641 if current_index == 0 {
642 current_index = matches.len() - 1;
643 } else {
644 current_index -= 1;
645 }
646 } else if direction == Direction::Next {
647 if current_index == matches.len() - 1 {
648 current_index = 0
649 } else {
650 current_index += 1;
651 }
652 };
653 current_index
654 }
655
656 fn find_matches(
657 &mut self,
658 query: project::search::SearchQuery,
659 cx: &mut ViewContext<Self>,
660 ) -> Task<Vec<Range<Anchor>>> {
661 let buffer = self.buffer().read(cx).snapshot(cx);
662 cx.background().spawn(async move {
663 let mut ranges = Vec::new();
664 if let Some((_, _, excerpt_buffer)) = buffer.as_singleton() {
665 ranges.extend(
666 query
667 .search(excerpt_buffer.as_rope())
668 .await
669 .into_iter()
670 .map(|range| {
671 buffer.anchor_after(range.start)..buffer.anchor_before(range.end)
672 }),
673 );
674 } else {
675 for excerpt in buffer.excerpt_boundaries_in_range(0..buffer.len()) {
676 let excerpt_range = excerpt.range.context.to_offset(&excerpt.buffer);
677 let rope = excerpt.buffer.as_rope().slice(excerpt_range.clone());
678 ranges.extend(query.search(&rope).await.into_iter().map(|range| {
679 let start = excerpt
680 .buffer
681 .anchor_after(excerpt_range.start + range.start);
682 let end = excerpt
683 .buffer
684 .anchor_before(excerpt_range.start + range.end);
685 buffer.anchor_in_excerpt(excerpt.id.clone(), start)
686 ..buffer.anchor_in_excerpt(excerpt.id.clone(), end)
687 }));
688 }
689 }
690 ranges
691 })
692 }
693
694 fn active_match_index(
695 &mut self,
696 matches: Vec<Range<Anchor>>,
697 cx: &mut ViewContext<Self>,
698 ) -> Option<usize> {
699 active_match_index(
700 &matches,
701 &self.selections.newest_anchor().head(),
702 &self.buffer().read(cx).snapshot(cx),
703 )
704 }
705}
706
707pub fn active_match_index(
708 ranges: &[Range<Anchor>],
709 cursor: &Anchor,
710 buffer: &MultiBufferSnapshot,
711) -> Option<usize> {
712 if ranges.is_empty() {
713 None
714 } else {
715 match ranges.binary_search_by(|probe| {
716 if probe.end.cmp(cursor, &*buffer).is_lt() {
717 Ordering::Less
718 } else if probe.start.cmp(cursor, &*buffer).is_gt() {
719 Ordering::Greater
720 } else {
721 Ordering::Equal
722 }
723 }) {
724 Ok(i) | Err(i) => Some(cmp::min(i, ranges.len() - 1)),
725 }
726 }
727}
728
729pub struct CursorPosition {
730 position: Option<Point>,
731 selected_count: usize,
732 _observe_active_editor: Option<Subscription>,
733}
734
735impl Default for CursorPosition {
736 fn default() -> Self {
737 Self::new()
738 }
739}
740
741impl CursorPosition {
742 pub fn new() -> Self {
743 Self {
744 position: None,
745 selected_count: 0,
746 _observe_active_editor: None,
747 }
748 }
749
750 fn update_position(&mut self, editor: ViewHandle<Editor>, cx: &mut ViewContext<Self>) {
751 let editor = editor.read(cx);
752 let buffer = editor.buffer().read(cx).snapshot(cx);
753
754 self.selected_count = 0;
755 let mut last_selection: Option<Selection<usize>> = None;
756 for selection in editor.selections.all::<usize>(cx) {
757 self.selected_count += selection.end - selection.start;
758 if last_selection
759 .as_ref()
760 .map_or(true, |last_selection| selection.id > last_selection.id)
761 {
762 last_selection = Some(selection);
763 }
764 }
765 self.position = last_selection.map(|s| s.head().to_point(&buffer));
766
767 cx.notify();
768 }
769}
770
771impl Entity for CursorPosition {
772 type Event = ();
773}
774
775impl View for CursorPosition {
776 fn ui_name() -> &'static str {
777 "CursorPosition"
778 }
779
780 fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
781 if let Some(position) = self.position {
782 let theme = &cx.global::<Settings>().theme.workspace.status_bar;
783 let mut text = format!("{},{}", position.row + 1, position.column + 1);
784 if self.selected_count > 0 {
785 write!(text, " ({} selected)", self.selected_count).unwrap();
786 }
787 Label::new(text, theme.cursor_position.clone()).boxed()
788 } else {
789 Empty::new().boxed()
790 }
791 }
792}
793
794impl StatusItemView for CursorPosition {
795 fn set_active_pane_item(
796 &mut self,
797 active_pane_item: Option<&dyn ItemHandle>,
798 cx: &mut ViewContext<Self>,
799 ) {
800 if let Some(editor) = active_pane_item.and_then(|item| item.downcast::<Editor>()) {
801 self._observe_active_editor = Some(cx.observe(&editor, Self::update_position));
802 self.update_position(editor, cx);
803 } else {
804 self.position = None;
805 self._observe_active_editor = None;
806 }
807
808 cx.notify();
809 }
810}
811
812fn path_for_buffer<'a>(
813 buffer: &ModelHandle<MultiBuffer>,
814 mut height: usize,
815 include_filename: bool,
816 cx: &'a AppContext,
817) -> Option<Cow<'a, Path>> {
818 let file = buffer.read(cx).as_singleton()?.read(cx).file()?;
819 // Ensure we always render at least the filename.
820 height += 1;
821
822 let mut prefix = file.path().as_ref();
823 while height > 0 {
824 if let Some(parent) = prefix.parent() {
825 prefix = parent;
826 height -= 1;
827 } else {
828 break;
829 }
830 }
831
832 // Here we could have just always used `full_path`, but that is very
833 // allocation-heavy and so we try to use a `Cow<Path>` if we haven't
834 // traversed all the way up to the worktree's root.
835 if height > 0 {
836 let full_path = file.full_path(cx);
837 if include_filename {
838 Some(full_path.into())
839 } else {
840 Some(full_path.parent().unwrap().to_path_buf().into())
841 }
842 } else {
843 let mut path = file.path().strip_prefix(prefix).unwrap();
844 if !include_filename {
845 path = path.parent().unwrap();
846 }
847 Some(path.into())
848 }
849}