1mod anchor;
2
3pub use anchor::{Anchor, AnchorRangeExt};
4use anyhow::{anyhow, Result};
5use clock::ReplicaId;
6use collections::{BTreeMap, Bound, HashMap, HashSet};
7use futures::{channel::mpsc, SinkExt};
8use git::diff::DiffHunk;
9use gpui::{AppContext, Entity, ModelContext, ModelHandle, Task};
10pub use language::Completion;
11use language::{
12 char_kind,
13 language_settings::{language_settings, LanguageSettings},
14 AutoindentMode, Buffer, BufferChunks, BufferSnapshot, CharKind, Chunk, CursorShape,
15 DiagnosticEntry, File, IndentSize, Language, LanguageScope, OffsetRangeExt, OffsetUtf16,
16 Outline, OutlineItem, Point, PointUtf16, Selection, TextDimension, ToOffset as _,
17 ToOffsetUtf16 as _, ToPoint as _, ToPointUtf16 as _, TransactionId, Unclipped,
18};
19use std::{
20 borrow::Cow,
21 cell::{Ref, RefCell},
22 cmp, fmt,
23 future::Future,
24 io,
25 iter::{self, FromIterator},
26 mem,
27 ops::{Range, RangeBounds, Sub},
28 str,
29 sync::Arc,
30 time::{Duration, Instant},
31};
32use sum_tree::{Bias, Cursor, SumTree};
33use text::{
34 locator::Locator,
35 subscription::{Subscription, Topic},
36 Edit, TextSummary,
37};
38use theme::SyntaxTheme;
39use util::post_inc;
40
41const NEWLINES: &[u8] = &[b'\n'; u8::MAX as usize];
42
43#[derive(Debug, Default, Clone, Copy, Hash, PartialEq, Eq, PartialOrd, Ord)]
44pub struct ExcerptId(usize);
45
46pub struct MultiBuffer {
47 snapshot: RefCell<MultiBufferSnapshot>,
48 buffers: RefCell<HashMap<u64, BufferState>>,
49 next_excerpt_id: usize,
50 subscriptions: Topic,
51 singleton: bool,
52 replica_id: ReplicaId,
53 history: History,
54 title: Option<String>,
55}
56
57#[derive(Clone, Debug, PartialEq, Eq)]
58pub enum Event {
59 ExcerptsAdded {
60 buffer: ModelHandle<Buffer>,
61 predecessor: ExcerptId,
62 excerpts: Vec<(ExcerptId, ExcerptRange<language::Anchor>)>,
63 },
64 ExcerptsRemoved {
65 ids: Vec<ExcerptId>,
66 },
67 ExcerptsEdited {
68 ids: Vec<ExcerptId>,
69 },
70 Edited,
71 Reloaded,
72 DiffBaseChanged,
73 LanguageChanged,
74 Reparsed,
75 Saved,
76 FileHandleChanged,
77 Closed,
78 DirtyChanged,
79 DiagnosticsUpdated,
80}
81
82#[derive(Clone)]
83struct History {
84 next_transaction_id: TransactionId,
85 undo_stack: Vec<Transaction>,
86 redo_stack: Vec<Transaction>,
87 transaction_depth: usize,
88 group_interval: Duration,
89}
90
91#[derive(Clone)]
92struct Transaction {
93 id: TransactionId,
94 buffer_transactions: HashMap<u64, text::TransactionId>,
95 first_edit_at: Instant,
96 last_edit_at: Instant,
97 suppress_grouping: bool,
98}
99
100pub trait ToOffset: 'static + fmt::Debug {
101 fn to_offset(&self, snapshot: &MultiBufferSnapshot) -> usize;
102}
103
104pub trait ToOffsetUtf16: 'static + fmt::Debug {
105 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16;
106}
107
108pub trait ToPoint: 'static + fmt::Debug {
109 fn to_point(&self, snapshot: &MultiBufferSnapshot) -> Point;
110}
111
112pub trait ToPointUtf16: 'static + fmt::Debug {
113 fn to_point_utf16(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16;
114}
115
116struct BufferState {
117 buffer: ModelHandle<Buffer>,
118 last_version: clock::Global,
119 last_parse_count: usize,
120 last_selections_update_count: usize,
121 last_diagnostics_update_count: usize,
122 last_file_update_count: usize,
123 last_git_diff_update_count: usize,
124 excerpts: Vec<Locator>,
125 _subscriptions: [gpui::Subscription; 2],
126}
127
128#[derive(Clone, Default)]
129pub struct MultiBufferSnapshot {
130 singleton: bool,
131 excerpts: SumTree<Excerpt>,
132 excerpt_ids: SumTree<ExcerptIdMapping>,
133 parse_count: usize,
134 diagnostics_update_count: usize,
135 trailing_excerpt_update_count: usize,
136 git_diff_update_count: usize,
137 edit_count: usize,
138 is_dirty: bool,
139 has_conflict: bool,
140}
141
142pub struct ExcerptBoundary {
143 pub id: ExcerptId,
144 pub row: u32,
145 pub buffer: BufferSnapshot,
146 pub range: ExcerptRange<text::Anchor>,
147 pub starts_new_buffer: bool,
148}
149
150#[derive(Clone)]
151struct Excerpt {
152 id: ExcerptId,
153 locator: Locator,
154 buffer_id: u64,
155 buffer: BufferSnapshot,
156 range: ExcerptRange<text::Anchor>,
157 max_buffer_row: u32,
158 text_summary: TextSummary,
159 has_trailing_newline: bool,
160}
161
162#[derive(Clone, Debug)]
163struct ExcerptIdMapping {
164 id: ExcerptId,
165 locator: Locator,
166}
167
168#[derive(Clone, Debug, Eq, PartialEq)]
169pub struct ExcerptRange<T> {
170 pub context: Range<T>,
171 pub primary: Option<Range<T>>,
172}
173
174#[derive(Clone, Debug, Default)]
175struct ExcerptSummary {
176 excerpt_id: ExcerptId,
177 excerpt_locator: Locator,
178 max_buffer_row: u32,
179 text: TextSummary,
180}
181
182#[derive(Clone)]
183pub struct MultiBufferRows<'a> {
184 buffer_row_range: Range<u32>,
185 excerpts: Cursor<'a, Excerpt, Point>,
186}
187
188pub struct MultiBufferChunks<'a> {
189 range: Range<usize>,
190 excerpts: Cursor<'a, Excerpt, usize>,
191 excerpt_chunks: Option<ExcerptChunks<'a>>,
192 language_aware: bool,
193}
194
195pub struct MultiBufferBytes<'a> {
196 range: Range<usize>,
197 excerpts: Cursor<'a, Excerpt, usize>,
198 excerpt_bytes: Option<ExcerptBytes<'a>>,
199 chunk: &'a [u8],
200}
201
202struct ExcerptChunks<'a> {
203 content_chunks: BufferChunks<'a>,
204 footer_height: usize,
205}
206
207struct ExcerptBytes<'a> {
208 content_bytes: text::Bytes<'a>,
209 footer_height: usize,
210}
211
212impl MultiBuffer {
213 pub fn new(replica_id: ReplicaId) -> Self {
214 Self {
215 snapshot: Default::default(),
216 buffers: Default::default(),
217 next_excerpt_id: 1,
218 subscriptions: Default::default(),
219 singleton: false,
220 replica_id,
221 history: History {
222 next_transaction_id: Default::default(),
223 undo_stack: Default::default(),
224 redo_stack: Default::default(),
225 transaction_depth: 0,
226 group_interval: Duration::from_millis(300),
227 },
228 title: Default::default(),
229 }
230 }
231
232 pub fn clone(&self, new_cx: &mut ModelContext<Self>) -> Self {
233 let mut buffers = HashMap::default();
234 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
235 buffers.insert(
236 *buffer_id,
237 BufferState {
238 buffer: buffer_state.buffer.clone(),
239 last_version: buffer_state.last_version.clone(),
240 last_parse_count: buffer_state.last_parse_count,
241 last_selections_update_count: buffer_state.last_selections_update_count,
242 last_diagnostics_update_count: buffer_state.last_diagnostics_update_count,
243 last_file_update_count: buffer_state.last_file_update_count,
244 last_git_diff_update_count: buffer_state.last_git_diff_update_count,
245 excerpts: buffer_state.excerpts.clone(),
246 _subscriptions: [
247 new_cx.observe(&buffer_state.buffer, |_, _, cx| cx.notify()),
248 new_cx.subscribe(&buffer_state.buffer, Self::on_buffer_event),
249 ],
250 },
251 );
252 }
253 Self {
254 snapshot: RefCell::new(self.snapshot.borrow().clone()),
255 buffers: RefCell::new(buffers),
256 next_excerpt_id: 1,
257 subscriptions: Default::default(),
258 singleton: self.singleton,
259 replica_id: self.replica_id,
260 history: self.history.clone(),
261 title: self.title.clone(),
262 }
263 }
264
265 pub fn with_title(mut self, title: String) -> Self {
266 self.title = Some(title);
267 self
268 }
269
270 pub fn singleton(buffer: ModelHandle<Buffer>, cx: &mut ModelContext<Self>) -> Self {
271 let mut this = Self::new(buffer.read(cx).replica_id());
272 this.singleton = true;
273 this.push_excerpts(
274 buffer,
275 [ExcerptRange {
276 context: text::Anchor::MIN..text::Anchor::MAX,
277 primary: None,
278 }],
279 cx,
280 );
281 this.snapshot.borrow_mut().singleton = true;
282 this
283 }
284
285 pub fn replica_id(&self) -> ReplicaId {
286 self.replica_id
287 }
288
289 pub fn snapshot(&self, cx: &AppContext) -> MultiBufferSnapshot {
290 self.sync(cx);
291 self.snapshot.borrow().clone()
292 }
293
294 pub(crate) fn read(&self, cx: &AppContext) -> Ref<MultiBufferSnapshot> {
295 self.sync(cx);
296 self.snapshot.borrow()
297 }
298
299 pub fn as_singleton(&self) -> Option<ModelHandle<Buffer>> {
300 if self.singleton {
301 return Some(
302 self.buffers
303 .borrow()
304 .values()
305 .next()
306 .unwrap()
307 .buffer
308 .clone(),
309 );
310 } else {
311 None
312 }
313 }
314
315 pub fn is_singleton(&self) -> bool {
316 self.singleton
317 }
318
319 pub fn subscribe(&mut self) -> Subscription {
320 self.subscriptions.subscribe()
321 }
322
323 pub fn is_dirty(&self, cx: &AppContext) -> bool {
324 self.read(cx).is_dirty()
325 }
326
327 pub fn has_conflict(&self, cx: &AppContext) -> bool {
328 self.read(cx).has_conflict()
329 }
330
331 // The `is_empty` signature doesn't match what clippy expects
332 #[allow(clippy::len_without_is_empty)]
333 pub fn len(&self, cx: &AppContext) -> usize {
334 self.read(cx).len()
335 }
336
337 pub fn is_empty(&self, cx: &AppContext) -> bool {
338 self.len(cx) != 0
339 }
340
341 pub fn symbols_containing<T: ToOffset>(
342 &self,
343 offset: T,
344 theme: Option<&SyntaxTheme>,
345 cx: &AppContext,
346 ) -> Option<(u64, Vec<OutlineItem<Anchor>>)> {
347 self.read(cx).symbols_containing(offset, theme)
348 }
349
350 pub fn edit<I, S, T>(
351 &mut self,
352 edits: I,
353 mut autoindent_mode: Option<AutoindentMode>,
354 cx: &mut ModelContext<Self>,
355 ) where
356 I: IntoIterator<Item = (Range<S>, T)>,
357 S: ToOffset,
358 T: Into<Arc<str>>,
359 {
360 if self.buffers.borrow().is_empty() {
361 return;
362 }
363
364 let snapshot = self.read(cx);
365 let edits = edits.into_iter().map(|(range, new_text)| {
366 let mut range = range.start.to_offset(&snapshot)..range.end.to_offset(&snapshot);
367 if range.start > range.end {
368 mem::swap(&mut range.start, &mut range.end);
369 }
370 (range, new_text)
371 });
372
373 if let Some(buffer) = self.as_singleton() {
374 return buffer.update(cx, |buffer, cx| {
375 buffer.edit(edits, autoindent_mode, cx);
376 });
377 }
378
379 let original_indent_columns = match &mut autoindent_mode {
380 Some(AutoindentMode::Block {
381 original_indent_columns,
382 }) => mem::take(original_indent_columns),
383 _ => Default::default(),
384 };
385
386 struct BufferEdit {
387 range: Range<usize>,
388 new_text: Arc<str>,
389 is_insertion: bool,
390 original_indent_column: u32,
391 }
392 let mut buffer_edits: HashMap<u64, Vec<BufferEdit>> = Default::default();
393 let mut edited_excerpt_ids = Vec::new();
394 let mut cursor = snapshot.excerpts.cursor::<usize>();
395 for (ix, (range, new_text)) in edits.enumerate() {
396 let new_text: Arc<str> = new_text.into();
397 let original_indent_column = original_indent_columns.get(ix).copied().unwrap_or(0);
398 cursor.seek(&range.start, Bias::Right, &());
399 if cursor.item().is_none() && range.start == *cursor.start() {
400 cursor.prev(&());
401 }
402 let start_excerpt = cursor.item().expect("start offset out of bounds");
403 let start_overshoot = range.start - cursor.start();
404 let buffer_start = start_excerpt
405 .range
406 .context
407 .start
408 .to_offset(&start_excerpt.buffer)
409 + start_overshoot;
410 edited_excerpt_ids.push(start_excerpt.id);
411
412 cursor.seek(&range.end, Bias::Right, &());
413 if cursor.item().is_none() && range.end == *cursor.start() {
414 cursor.prev(&());
415 }
416 let end_excerpt = cursor.item().expect("end offset out of bounds");
417 let end_overshoot = range.end - cursor.start();
418 let buffer_end = end_excerpt
419 .range
420 .context
421 .start
422 .to_offset(&end_excerpt.buffer)
423 + end_overshoot;
424
425 if start_excerpt.id == end_excerpt.id {
426 buffer_edits
427 .entry(start_excerpt.buffer_id)
428 .or_insert(Vec::new())
429 .push(BufferEdit {
430 range: buffer_start..buffer_end,
431 new_text,
432 is_insertion: true,
433 original_indent_column,
434 });
435 } else {
436 edited_excerpt_ids.push(end_excerpt.id);
437 let start_excerpt_range = buffer_start
438 ..start_excerpt
439 .range
440 .context
441 .end
442 .to_offset(&start_excerpt.buffer);
443 let end_excerpt_range = end_excerpt
444 .range
445 .context
446 .start
447 .to_offset(&end_excerpt.buffer)
448 ..buffer_end;
449 buffer_edits
450 .entry(start_excerpt.buffer_id)
451 .or_insert(Vec::new())
452 .push(BufferEdit {
453 range: start_excerpt_range,
454 new_text: new_text.clone(),
455 is_insertion: true,
456 original_indent_column,
457 });
458 buffer_edits
459 .entry(end_excerpt.buffer_id)
460 .or_insert(Vec::new())
461 .push(BufferEdit {
462 range: end_excerpt_range,
463 new_text: new_text.clone(),
464 is_insertion: false,
465 original_indent_column,
466 });
467
468 cursor.seek(&range.start, Bias::Right, &());
469 cursor.next(&());
470 while let Some(excerpt) = cursor.item() {
471 if excerpt.id == end_excerpt.id {
472 break;
473 }
474 buffer_edits
475 .entry(excerpt.buffer_id)
476 .or_insert(Vec::new())
477 .push(BufferEdit {
478 range: excerpt.range.context.to_offset(&excerpt.buffer),
479 new_text: new_text.clone(),
480 is_insertion: false,
481 original_indent_column,
482 });
483 edited_excerpt_ids.push(excerpt.id);
484 cursor.next(&());
485 }
486 }
487 }
488
489 for (buffer_id, mut edits) in buffer_edits {
490 edits.sort_unstable_by_key(|edit| edit.range.start);
491 self.buffers.borrow()[&buffer_id]
492 .buffer
493 .update(cx, |buffer, cx| {
494 let mut edits = edits.into_iter().peekable();
495 let mut insertions = Vec::new();
496 let mut original_indent_columns = Vec::new();
497 let mut deletions = Vec::new();
498 let empty_str: Arc<str> = "".into();
499 while let Some(BufferEdit {
500 mut range,
501 new_text,
502 mut is_insertion,
503 original_indent_column,
504 }) = edits.next()
505 {
506 while let Some(BufferEdit {
507 range: next_range,
508 is_insertion: next_is_insertion,
509 ..
510 }) = edits.peek()
511 {
512 if range.end >= next_range.start {
513 range.end = cmp::max(next_range.end, range.end);
514 is_insertion |= *next_is_insertion;
515 edits.next();
516 } else {
517 break;
518 }
519 }
520
521 if is_insertion {
522 original_indent_columns.push(original_indent_column);
523 insertions.push((
524 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
525 new_text.clone(),
526 ));
527 } else if !range.is_empty() {
528 deletions.push((
529 buffer.anchor_before(range.start)..buffer.anchor_before(range.end),
530 empty_str.clone(),
531 ));
532 }
533 }
534
535 let deletion_autoindent_mode =
536 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
537 Some(AutoindentMode::Block {
538 original_indent_columns: Default::default(),
539 })
540 } else {
541 None
542 };
543 let insertion_autoindent_mode =
544 if let Some(AutoindentMode::Block { .. }) = autoindent_mode {
545 Some(AutoindentMode::Block {
546 original_indent_columns,
547 })
548 } else {
549 None
550 };
551
552 buffer.edit(deletions, deletion_autoindent_mode, cx);
553 buffer.edit(insertions, insertion_autoindent_mode, cx);
554 })
555 }
556
557 cx.emit(Event::ExcerptsEdited {
558 ids: edited_excerpt_ids,
559 });
560 }
561
562 pub fn start_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
563 self.start_transaction_at(Instant::now(), cx)
564 }
565
566 pub(crate) fn start_transaction_at(
567 &mut self,
568 now: Instant,
569 cx: &mut ModelContext<Self>,
570 ) -> Option<TransactionId> {
571 if let Some(buffer) = self.as_singleton() {
572 return buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
573 }
574
575 for BufferState { buffer, .. } in self.buffers.borrow().values() {
576 buffer.update(cx, |buffer, _| buffer.start_transaction_at(now));
577 }
578 self.history.start_transaction(now)
579 }
580
581 pub fn end_transaction(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
582 self.end_transaction_at(Instant::now(), cx)
583 }
584
585 pub(crate) fn end_transaction_at(
586 &mut self,
587 now: Instant,
588 cx: &mut ModelContext<Self>,
589 ) -> Option<TransactionId> {
590 if let Some(buffer) = self.as_singleton() {
591 return buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx));
592 }
593
594 let mut buffer_transactions = HashMap::default();
595 for BufferState { buffer, .. } in self.buffers.borrow().values() {
596 if let Some(transaction_id) =
597 buffer.update(cx, |buffer, cx| buffer.end_transaction_at(now, cx))
598 {
599 buffer_transactions.insert(buffer.read(cx).remote_id(), transaction_id);
600 }
601 }
602
603 if self.history.end_transaction(now, buffer_transactions) {
604 let transaction_id = self.history.group().unwrap();
605 Some(transaction_id)
606 } else {
607 None
608 }
609 }
610
611 pub fn finalize_last_transaction(&mut self, cx: &mut ModelContext<Self>) {
612 self.history.finalize_last_transaction();
613 for BufferState { buffer, .. } in self.buffers.borrow().values() {
614 buffer.update(cx, |buffer, _| {
615 buffer.finalize_last_transaction();
616 });
617 }
618 }
619
620 pub fn push_transaction<'a, T>(&mut self, buffer_transactions: T, cx: &mut ModelContext<Self>)
621 where
622 T: IntoIterator<Item = (&'a ModelHandle<Buffer>, &'a language::Transaction)>,
623 {
624 self.history
625 .push_transaction(buffer_transactions, Instant::now(), cx);
626 self.history.finalize_last_transaction();
627 }
628
629 pub fn group_until_transaction(
630 &mut self,
631 transaction_id: TransactionId,
632 cx: &mut ModelContext<Self>,
633 ) {
634 if let Some(buffer) = self.as_singleton() {
635 buffer.update(cx, |buffer, _| {
636 buffer.group_until_transaction(transaction_id)
637 });
638 } else {
639 self.history.group_until(transaction_id);
640 }
641 }
642
643 pub fn set_active_selections(
644 &mut self,
645 selections: &[Selection<Anchor>],
646 line_mode: bool,
647 cursor_shape: CursorShape,
648 cx: &mut ModelContext<Self>,
649 ) {
650 let mut selections_by_buffer: HashMap<u64, Vec<Selection<text::Anchor>>> =
651 Default::default();
652 let snapshot = self.read(cx);
653 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
654 for selection in selections {
655 let start_locator = snapshot.excerpt_locator_for_id(selection.start.excerpt_id);
656 let end_locator = snapshot.excerpt_locator_for_id(selection.end.excerpt_id);
657
658 cursor.seek(&Some(start_locator), Bias::Left, &());
659 while let Some(excerpt) = cursor.item() {
660 if excerpt.locator > *end_locator {
661 break;
662 }
663
664 let mut start = excerpt.range.context.start;
665 let mut end = excerpt.range.context.end;
666 if excerpt.id == selection.start.excerpt_id {
667 start = selection.start.text_anchor;
668 }
669 if excerpt.id == selection.end.excerpt_id {
670 end = selection.end.text_anchor;
671 }
672 selections_by_buffer
673 .entry(excerpt.buffer_id)
674 .or_default()
675 .push(Selection {
676 id: selection.id,
677 start,
678 end,
679 reversed: selection.reversed,
680 goal: selection.goal,
681 });
682
683 cursor.next(&());
684 }
685 }
686
687 for (buffer_id, buffer_state) in self.buffers.borrow().iter() {
688 if !selections_by_buffer.contains_key(buffer_id) {
689 buffer_state
690 .buffer
691 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
692 }
693 }
694
695 for (buffer_id, mut selections) in selections_by_buffer {
696 self.buffers.borrow()[&buffer_id]
697 .buffer
698 .update(cx, |buffer, cx| {
699 selections.sort_unstable_by(|a, b| a.start.cmp(&b.start, buffer));
700 let mut selections = selections.into_iter().peekable();
701 let merged_selections = Arc::from_iter(iter::from_fn(|| {
702 let mut selection = selections.next()?;
703 while let Some(next_selection) = selections.peek() {
704 if selection.end.cmp(&next_selection.start, buffer).is_ge() {
705 let next_selection = selections.next().unwrap();
706 if next_selection.end.cmp(&selection.end, buffer).is_ge() {
707 selection.end = next_selection.end;
708 }
709 } else {
710 break;
711 }
712 }
713 Some(selection)
714 }));
715 buffer.set_active_selections(merged_selections, line_mode, cursor_shape, cx);
716 });
717 }
718 }
719
720 pub fn remove_active_selections(&mut self, cx: &mut ModelContext<Self>) {
721 for buffer in self.buffers.borrow().values() {
722 buffer
723 .buffer
724 .update(cx, |buffer, cx| buffer.remove_active_selections(cx));
725 }
726 }
727
728 pub fn undo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
729 if let Some(buffer) = self.as_singleton() {
730 return buffer.update(cx, |buffer, cx| buffer.undo(cx));
731 }
732
733 while let Some(transaction) = self.history.pop_undo() {
734 let mut undone = false;
735 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
736 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
737 undone |= buffer.update(cx, |buffer, cx| {
738 let undo_to = *buffer_transaction_id;
739 if let Some(entry) = buffer.peek_undo_stack() {
740 *buffer_transaction_id = entry.transaction_id();
741 }
742 buffer.undo_to_transaction(undo_to, cx)
743 });
744 }
745 }
746
747 if undone {
748 return Some(transaction.id);
749 }
750 }
751
752 None
753 }
754
755 pub fn redo(&mut self, cx: &mut ModelContext<Self>) -> Option<TransactionId> {
756 if let Some(buffer) = self.as_singleton() {
757 return buffer.update(cx, |buffer, cx| buffer.redo(cx));
758 }
759
760 while let Some(transaction) = self.history.pop_redo() {
761 let mut redone = false;
762 for (buffer_id, buffer_transaction_id) in &mut transaction.buffer_transactions {
763 if let Some(BufferState { buffer, .. }) = self.buffers.borrow().get(buffer_id) {
764 redone |= buffer.update(cx, |buffer, cx| {
765 let redo_to = *buffer_transaction_id;
766 if let Some(entry) = buffer.peek_redo_stack() {
767 *buffer_transaction_id = entry.transaction_id();
768 }
769 buffer.redo_to_transaction(redo_to, cx)
770 });
771 }
772 }
773
774 if redone {
775 return Some(transaction.id);
776 }
777 }
778
779 None
780 }
781
782 pub fn stream_excerpts_with_context_lines(
783 &mut self,
784 excerpts: Vec<(ModelHandle<Buffer>, Vec<Range<text::Anchor>>)>,
785 context_line_count: u32,
786 cx: &mut ModelContext<Self>,
787 ) -> (Task<()>, mpsc::Receiver<Range<Anchor>>) {
788 let (mut tx, rx) = mpsc::channel(256);
789 let task = cx.spawn(|this, mut cx| async move {
790 for (buffer, ranges) in excerpts {
791 let (buffer_id, buffer_snapshot) =
792 buffer.read_with(&cx, |buffer, _| (buffer.remote_id(), buffer.snapshot()));
793
794 let mut excerpt_ranges = Vec::new();
795 let mut range_counts = Vec::new();
796 cx.background()
797 .scoped(|scope| {
798 scope.spawn(async {
799 let (ranges, counts) =
800 build_excerpt_ranges(&buffer_snapshot, &ranges, context_line_count);
801 excerpt_ranges = ranges;
802 range_counts = counts;
803 });
804 })
805 .await;
806
807 let mut ranges = ranges.into_iter();
808 let mut range_counts = range_counts.into_iter();
809 for excerpt_ranges in excerpt_ranges.chunks(100) {
810 let excerpt_ids = this.update(&mut cx, |this, cx| {
811 this.push_excerpts(buffer.clone(), excerpt_ranges.iter().cloned(), cx)
812 });
813
814 for (excerpt_id, range_count) in
815 excerpt_ids.into_iter().zip(range_counts.by_ref())
816 {
817 for range in ranges.by_ref().take(range_count) {
818 let start = Anchor {
819 buffer_id: Some(buffer_id),
820 excerpt_id: excerpt_id.clone(),
821 text_anchor: range.start,
822 };
823 let end = Anchor {
824 buffer_id: Some(buffer_id),
825 excerpt_id: excerpt_id.clone(),
826 text_anchor: range.end,
827 };
828 if tx.send(start..end).await.is_err() {
829 break;
830 }
831 }
832 }
833 }
834 }
835 });
836 (task, rx)
837 }
838
839 pub fn push_excerpts<O>(
840 &mut self,
841 buffer: ModelHandle<Buffer>,
842 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
843 cx: &mut ModelContext<Self>,
844 ) -> Vec<ExcerptId>
845 where
846 O: text::ToOffset,
847 {
848 self.insert_excerpts_after(ExcerptId::max(), buffer, ranges, cx)
849 }
850
851 pub fn push_excerpts_with_context_lines<O>(
852 &mut self,
853 buffer: ModelHandle<Buffer>,
854 ranges: Vec<Range<O>>,
855 context_line_count: u32,
856 cx: &mut ModelContext<Self>,
857 ) -> Vec<Range<Anchor>>
858 where
859 O: text::ToPoint + text::ToOffset,
860 {
861 let buffer_id = buffer.read(cx).remote_id();
862 let buffer_snapshot = buffer.read(cx).snapshot();
863 let (excerpt_ranges, range_counts) =
864 build_excerpt_ranges(&buffer_snapshot, &ranges, context_line_count);
865
866 let excerpt_ids = self.push_excerpts(buffer, excerpt_ranges, cx);
867
868 let mut anchor_ranges = Vec::new();
869 let mut ranges = ranges.into_iter();
870 for (excerpt_id, range_count) in excerpt_ids.into_iter().zip(range_counts.into_iter()) {
871 anchor_ranges.extend(ranges.by_ref().take(range_count).map(|range| {
872 let start = Anchor {
873 buffer_id: Some(buffer_id),
874 excerpt_id: excerpt_id.clone(),
875 text_anchor: buffer_snapshot.anchor_after(range.start),
876 };
877 let end = Anchor {
878 buffer_id: Some(buffer_id),
879 excerpt_id: excerpt_id.clone(),
880 text_anchor: buffer_snapshot.anchor_after(range.end),
881 };
882 start..end
883 }))
884 }
885 anchor_ranges
886 }
887
888 pub fn insert_excerpts_after<O>(
889 &mut self,
890 prev_excerpt_id: ExcerptId,
891 buffer: ModelHandle<Buffer>,
892 ranges: impl IntoIterator<Item = ExcerptRange<O>>,
893 cx: &mut ModelContext<Self>,
894 ) -> Vec<ExcerptId>
895 where
896 O: text::ToOffset,
897 {
898 let mut ids = Vec::new();
899 let mut next_excerpt_id = self.next_excerpt_id;
900 self.insert_excerpts_with_ids_after(
901 prev_excerpt_id,
902 buffer,
903 ranges.into_iter().map(|range| {
904 let id = ExcerptId(post_inc(&mut next_excerpt_id));
905 ids.push(id);
906 (id, range)
907 }),
908 cx,
909 );
910 ids
911 }
912
913 pub fn insert_excerpts_with_ids_after<O>(
914 &mut self,
915 prev_excerpt_id: ExcerptId,
916 buffer: ModelHandle<Buffer>,
917 ranges: impl IntoIterator<Item = (ExcerptId, ExcerptRange<O>)>,
918 cx: &mut ModelContext<Self>,
919 ) where
920 O: text::ToOffset,
921 {
922 assert_eq!(self.history.transaction_depth, 0);
923 let mut ranges = ranges.into_iter().peekable();
924 if ranges.peek().is_none() {
925 return Default::default();
926 }
927
928 self.sync(cx);
929
930 let buffer_id = buffer.read(cx).remote_id();
931 let buffer_snapshot = buffer.read(cx).snapshot();
932
933 let mut buffers = self.buffers.borrow_mut();
934 let buffer_state = buffers.entry(buffer_id).or_insert_with(|| BufferState {
935 last_version: buffer_snapshot.version().clone(),
936 last_parse_count: buffer_snapshot.parse_count(),
937 last_selections_update_count: buffer_snapshot.selections_update_count(),
938 last_diagnostics_update_count: buffer_snapshot.diagnostics_update_count(),
939 last_file_update_count: buffer_snapshot.file_update_count(),
940 last_git_diff_update_count: buffer_snapshot.git_diff_update_count(),
941 excerpts: Default::default(),
942 _subscriptions: [
943 cx.observe(&buffer, |_, _, cx| cx.notify()),
944 cx.subscribe(&buffer, Self::on_buffer_event),
945 ],
946 buffer: buffer.clone(),
947 });
948
949 let mut snapshot = self.snapshot.borrow_mut();
950
951 let mut prev_locator = snapshot.excerpt_locator_for_id(prev_excerpt_id).clone();
952 let mut new_excerpt_ids = mem::take(&mut snapshot.excerpt_ids);
953 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
954 let mut new_excerpts = cursor.slice(&prev_locator, Bias::Right, &());
955 prev_locator = cursor.start().unwrap_or(Locator::min_ref()).clone();
956
957 let edit_start = new_excerpts.summary().text.len;
958 new_excerpts.update_last(
959 |excerpt| {
960 excerpt.has_trailing_newline = true;
961 },
962 &(),
963 );
964
965 let next_locator = if let Some(excerpt) = cursor.item() {
966 excerpt.locator.clone()
967 } else {
968 Locator::max()
969 };
970
971 let mut excerpts = Vec::new();
972 while let Some((id, range)) = ranges.next() {
973 let locator = Locator::between(&prev_locator, &next_locator);
974 if let Err(ix) = buffer_state.excerpts.binary_search(&locator) {
975 buffer_state.excerpts.insert(ix, locator.clone());
976 }
977 let range = ExcerptRange {
978 context: buffer_snapshot.anchor_before(&range.context.start)
979 ..buffer_snapshot.anchor_after(&range.context.end),
980 primary: range.primary.map(|primary| {
981 buffer_snapshot.anchor_before(&primary.start)
982 ..buffer_snapshot.anchor_after(&primary.end)
983 }),
984 };
985 if id.0 >= self.next_excerpt_id {
986 self.next_excerpt_id = id.0 + 1;
987 }
988 excerpts.push((id, range.clone()));
989 let excerpt = Excerpt::new(
990 id,
991 locator.clone(),
992 buffer_id,
993 buffer_snapshot.clone(),
994 range,
995 ranges.peek().is_some() || cursor.item().is_some(),
996 );
997 new_excerpts.push(excerpt, &());
998 prev_locator = locator.clone();
999 new_excerpt_ids.push(ExcerptIdMapping { id, locator }, &());
1000 }
1001
1002 let edit_end = new_excerpts.summary().text.len;
1003
1004 let suffix = cursor.suffix(&());
1005 let changed_trailing_excerpt = suffix.is_empty();
1006 new_excerpts.push_tree(suffix, &());
1007 drop(cursor);
1008 snapshot.excerpts = new_excerpts;
1009 snapshot.excerpt_ids = new_excerpt_ids;
1010 if changed_trailing_excerpt {
1011 snapshot.trailing_excerpt_update_count += 1;
1012 }
1013
1014 self.subscriptions.publish_mut([Edit {
1015 old: edit_start..edit_start,
1016 new: edit_start..edit_end,
1017 }]);
1018 cx.emit(Event::Edited);
1019 cx.emit(Event::ExcerptsAdded {
1020 buffer,
1021 predecessor: prev_excerpt_id,
1022 excerpts,
1023 });
1024 cx.notify();
1025 }
1026
1027 pub fn clear(&mut self, cx: &mut ModelContext<Self>) {
1028 self.sync(cx);
1029 let ids = self.excerpt_ids();
1030 self.buffers.borrow_mut().clear();
1031 let mut snapshot = self.snapshot.borrow_mut();
1032 let prev_len = snapshot.len();
1033 snapshot.excerpts = Default::default();
1034 snapshot.trailing_excerpt_update_count += 1;
1035 snapshot.is_dirty = false;
1036 snapshot.has_conflict = false;
1037
1038 self.subscriptions.publish_mut([Edit {
1039 old: 0..prev_len,
1040 new: 0..0,
1041 }]);
1042 cx.emit(Event::Edited);
1043 cx.emit(Event::ExcerptsRemoved { ids });
1044 cx.notify();
1045 }
1046
1047 pub fn excerpts_for_buffer(
1048 &self,
1049 buffer: &ModelHandle<Buffer>,
1050 cx: &AppContext,
1051 ) -> Vec<(ExcerptId, ExcerptRange<text::Anchor>)> {
1052 let mut excerpts = Vec::new();
1053 let snapshot = self.read(cx);
1054 let buffers = self.buffers.borrow();
1055 let mut cursor = snapshot.excerpts.cursor::<Option<&Locator>>();
1056 for locator in buffers
1057 .get(&buffer.read(cx).remote_id())
1058 .map(|state| &state.excerpts)
1059 .into_iter()
1060 .flatten()
1061 {
1062 cursor.seek_forward(&Some(locator), Bias::Left, &());
1063 if let Some(excerpt) = cursor.item() {
1064 if excerpt.locator == *locator {
1065 excerpts.push((excerpt.id.clone(), excerpt.range.clone()));
1066 }
1067 }
1068 }
1069
1070 excerpts
1071 }
1072
1073 pub fn excerpt_ids(&self) -> Vec<ExcerptId> {
1074 self.snapshot
1075 .borrow()
1076 .excerpts
1077 .iter()
1078 .map(|entry| entry.id)
1079 .collect()
1080 }
1081
1082 pub fn excerpt_containing(
1083 &self,
1084 position: impl ToOffset,
1085 cx: &AppContext,
1086 ) -> Option<(ExcerptId, ModelHandle<Buffer>, Range<text::Anchor>)> {
1087 let snapshot = self.read(cx);
1088 let position = position.to_offset(&snapshot);
1089
1090 let mut cursor = snapshot.excerpts.cursor::<usize>();
1091 cursor.seek(&position, Bias::Right, &());
1092 cursor
1093 .item()
1094 .or_else(|| snapshot.excerpts.last())
1095 .map(|excerpt| {
1096 (
1097 excerpt.id.clone(),
1098 self.buffers
1099 .borrow()
1100 .get(&excerpt.buffer_id)
1101 .unwrap()
1102 .buffer
1103 .clone(),
1104 excerpt.range.context.clone(),
1105 )
1106 })
1107 }
1108
1109 // If point is at the end of the buffer, the last excerpt is returned
1110 pub fn point_to_buffer_offset<T: ToOffset>(
1111 &self,
1112 point: T,
1113 cx: &AppContext,
1114 ) -> Option<(ModelHandle<Buffer>, usize)> {
1115 let snapshot = self.read(cx);
1116 let offset = point.to_offset(&snapshot);
1117 let mut cursor = snapshot.excerpts.cursor::<usize>();
1118 cursor.seek(&offset, Bias::Right, &());
1119 if cursor.item().is_none() {
1120 cursor.prev(&());
1121 }
1122
1123 cursor.item().map(|excerpt| {
1124 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1125 let buffer_point = excerpt_start + offset - *cursor.start();
1126 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1127
1128 (buffer, buffer_point)
1129 })
1130 }
1131
1132 pub fn range_to_buffer_ranges<T: ToOffset>(
1133 &self,
1134 range: Range<T>,
1135 cx: &AppContext,
1136 ) -> Vec<(ModelHandle<Buffer>, Range<usize>)> {
1137 let snapshot = self.read(cx);
1138 let start = range.start.to_offset(&snapshot);
1139 let end = range.end.to_offset(&snapshot);
1140
1141 let mut result = Vec::new();
1142 let mut cursor = snapshot.excerpts.cursor::<usize>();
1143 cursor.seek(&start, Bias::Right, &());
1144 if cursor.item().is_none() {
1145 cursor.prev(&());
1146 }
1147
1148 while let Some(excerpt) = cursor.item() {
1149 if *cursor.start() > end {
1150 break;
1151 }
1152
1153 let mut end_before_newline = cursor.end(&());
1154 if excerpt.has_trailing_newline {
1155 end_before_newline -= 1;
1156 }
1157 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1158 let start = excerpt_start + (cmp::max(start, *cursor.start()) - *cursor.start());
1159 let end = excerpt_start + (cmp::min(end, end_before_newline) - *cursor.start());
1160 let buffer = self.buffers.borrow()[&excerpt.buffer_id].buffer.clone();
1161 result.push((buffer, start..end));
1162 cursor.next(&());
1163 }
1164
1165 result
1166 }
1167
1168 pub fn remove_excerpts(
1169 &mut self,
1170 excerpt_ids: impl IntoIterator<Item = ExcerptId>,
1171 cx: &mut ModelContext<Self>,
1172 ) {
1173 self.sync(cx);
1174 let ids = excerpt_ids.into_iter().collect::<Vec<_>>();
1175 if ids.is_empty() {
1176 return;
1177 }
1178
1179 let mut buffers = self.buffers.borrow_mut();
1180 let mut snapshot = self.snapshot.borrow_mut();
1181 let mut new_excerpts = SumTree::new();
1182 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1183 let mut edits = Vec::new();
1184 let mut excerpt_ids = ids.iter().copied().peekable();
1185
1186 while let Some(excerpt_id) = excerpt_ids.next() {
1187 // Seek to the next excerpt to remove, preserving any preceding excerpts.
1188 let locator = snapshot.excerpt_locator_for_id(excerpt_id);
1189 new_excerpts.push_tree(cursor.slice(&Some(locator), Bias::Left, &()), &());
1190
1191 if let Some(mut excerpt) = cursor.item() {
1192 if excerpt.id != excerpt_id {
1193 continue;
1194 }
1195 let mut old_start = cursor.start().1;
1196
1197 // Skip over the removed excerpt.
1198 'remove_excerpts: loop {
1199 if let Some(buffer_state) = buffers.get_mut(&excerpt.buffer_id) {
1200 buffer_state.excerpts.retain(|l| l != &excerpt.locator);
1201 if buffer_state.excerpts.is_empty() {
1202 buffers.remove(&excerpt.buffer_id);
1203 }
1204 }
1205 cursor.next(&());
1206
1207 // Skip over any subsequent excerpts that are also removed.
1208 while let Some(&next_excerpt_id) = excerpt_ids.peek() {
1209 let next_locator = snapshot.excerpt_locator_for_id(next_excerpt_id);
1210 if let Some(next_excerpt) = cursor.item() {
1211 if next_excerpt.locator == *next_locator {
1212 excerpt_ids.next();
1213 excerpt = next_excerpt;
1214 continue 'remove_excerpts;
1215 }
1216 }
1217 break;
1218 }
1219
1220 break;
1221 }
1222
1223 // When removing the last excerpt, remove the trailing newline from
1224 // the previous excerpt.
1225 if cursor.item().is_none() && old_start > 0 {
1226 old_start -= 1;
1227 new_excerpts.update_last(|e| e.has_trailing_newline = false, &());
1228 }
1229
1230 // Push an edit for the removal of this run of excerpts.
1231 let old_end = cursor.start().1;
1232 let new_start = new_excerpts.summary().text.len;
1233 edits.push(Edit {
1234 old: old_start..old_end,
1235 new: new_start..new_start,
1236 });
1237 }
1238 }
1239 let suffix = cursor.suffix(&());
1240 let changed_trailing_excerpt = suffix.is_empty();
1241 new_excerpts.push_tree(suffix, &());
1242 drop(cursor);
1243 snapshot.excerpts = new_excerpts;
1244
1245 if changed_trailing_excerpt {
1246 snapshot.trailing_excerpt_update_count += 1;
1247 }
1248
1249 self.subscriptions.publish_mut(edits);
1250 cx.emit(Event::Edited);
1251 cx.emit(Event::ExcerptsRemoved { ids });
1252 cx.notify();
1253 }
1254
1255 pub fn wait_for_anchors<'a>(
1256 &self,
1257 anchors: impl 'a + Iterator<Item = Anchor>,
1258 cx: &mut ModelContext<Self>,
1259 ) -> impl 'static + Future<Output = Result<()>> {
1260 let borrow = self.buffers.borrow();
1261 let mut error = None;
1262 let mut futures = Vec::new();
1263 for anchor in anchors {
1264 if let Some(buffer_id) = anchor.buffer_id {
1265 if let Some(buffer) = borrow.get(&buffer_id) {
1266 buffer.buffer.update(cx, |buffer, _| {
1267 futures.push(buffer.wait_for_anchors([anchor.text_anchor]))
1268 });
1269 } else {
1270 error = Some(anyhow!(
1271 "buffer {buffer_id} is not part of this multi-buffer"
1272 ));
1273 break;
1274 }
1275 }
1276 }
1277 async move {
1278 if let Some(error) = error {
1279 Err(error)?;
1280 }
1281 for future in futures {
1282 future.await?;
1283 }
1284 Ok(())
1285 }
1286 }
1287
1288 pub fn text_anchor_for_position<T: ToOffset>(
1289 &self,
1290 position: T,
1291 cx: &AppContext,
1292 ) -> Option<(ModelHandle<Buffer>, language::Anchor)> {
1293 let snapshot = self.read(cx);
1294 let anchor = snapshot.anchor_before(position);
1295 let buffer = self
1296 .buffers
1297 .borrow()
1298 .get(&anchor.buffer_id?)?
1299 .buffer
1300 .clone();
1301 Some((buffer, anchor.text_anchor))
1302 }
1303
1304 fn on_buffer_event(
1305 &mut self,
1306 _: ModelHandle<Buffer>,
1307 event: &language::Event,
1308 cx: &mut ModelContext<Self>,
1309 ) {
1310 cx.emit(match event {
1311 language::Event::Edited => Event::Edited,
1312 language::Event::DirtyChanged => Event::DirtyChanged,
1313 language::Event::Saved => Event::Saved,
1314 language::Event::FileHandleChanged => Event::FileHandleChanged,
1315 language::Event::Reloaded => Event::Reloaded,
1316 language::Event::DiffBaseChanged => Event::DiffBaseChanged,
1317 language::Event::LanguageChanged => Event::LanguageChanged,
1318 language::Event::Reparsed => Event::Reparsed,
1319 language::Event::DiagnosticsUpdated => Event::DiagnosticsUpdated,
1320 language::Event::Closed => Event::Closed,
1321
1322 //
1323 language::Event::Operation(_) => return,
1324 });
1325 }
1326
1327 pub fn all_buffers(&self) -> HashSet<ModelHandle<Buffer>> {
1328 self.buffers
1329 .borrow()
1330 .values()
1331 .map(|state| state.buffer.clone())
1332 .collect()
1333 }
1334
1335 pub fn buffer(&self, buffer_id: u64) -> Option<ModelHandle<Buffer>> {
1336 self.buffers
1337 .borrow()
1338 .get(&buffer_id)
1339 .map(|state| state.buffer.clone())
1340 }
1341
1342 pub fn is_completion_trigger<T>(&self, position: T, text: &str, cx: &AppContext) -> bool
1343 where
1344 T: ToOffset,
1345 {
1346 let mut chars = text.chars();
1347 let char = if let Some(char) = chars.next() {
1348 char
1349 } else {
1350 return false;
1351 };
1352 if chars.next().is_some() {
1353 return false;
1354 }
1355
1356 if char.is_alphanumeric() || char == '_' {
1357 return true;
1358 }
1359
1360 let snapshot = self.snapshot(cx);
1361 let anchor = snapshot.anchor_before(position);
1362 anchor
1363 .buffer_id
1364 .and_then(|buffer_id| {
1365 let buffer = self.buffers.borrow().get(&buffer_id)?.buffer.clone();
1366 Some(
1367 buffer
1368 .read(cx)
1369 .completion_triggers()
1370 .iter()
1371 .any(|string| string == text),
1372 )
1373 })
1374 .unwrap_or(false)
1375 }
1376
1377 pub fn language_at<'a, T: ToOffset>(
1378 &self,
1379 point: T,
1380 cx: &'a AppContext,
1381 ) -> Option<Arc<Language>> {
1382 self.point_to_buffer_offset(point, cx)
1383 .and_then(|(buffer, offset)| buffer.read(cx).language_at(offset))
1384 }
1385
1386 pub fn settings_at<'a, T: ToOffset>(
1387 &self,
1388 point: T,
1389 cx: &'a AppContext,
1390 ) -> &'a LanguageSettings {
1391 let mut language = None;
1392 let mut file = None;
1393 if let Some((buffer, offset)) = self.point_to_buffer_offset(point, cx) {
1394 let buffer = buffer.read(cx);
1395 language = buffer.language_at(offset);
1396 file = buffer.file();
1397 }
1398 language_settings(language.as_ref(), file, cx)
1399 }
1400
1401 pub fn for_each_buffer(&self, mut f: impl FnMut(&ModelHandle<Buffer>)) {
1402 self.buffers
1403 .borrow()
1404 .values()
1405 .for_each(|state| f(&state.buffer))
1406 }
1407
1408 pub fn title<'a>(&'a self, cx: &'a AppContext) -> Cow<'a, str> {
1409 if let Some(title) = self.title.as_ref() {
1410 return title.into();
1411 }
1412
1413 if let Some(buffer) = self.as_singleton() {
1414 if let Some(file) = buffer.read(cx).file() {
1415 return file.file_name(cx).to_string_lossy();
1416 }
1417 }
1418
1419 "untitled".into()
1420 }
1421
1422 #[cfg(test)]
1423 pub fn is_parsing(&self, cx: &AppContext) -> bool {
1424 self.as_singleton().unwrap().read(cx).is_parsing()
1425 }
1426
1427 fn sync(&self, cx: &AppContext) {
1428 let mut snapshot = self.snapshot.borrow_mut();
1429 let mut excerpts_to_edit = Vec::new();
1430 let mut reparsed = false;
1431 let mut diagnostics_updated = false;
1432 let mut git_diff_updated = false;
1433 let mut is_dirty = false;
1434 let mut has_conflict = false;
1435 let mut edited = false;
1436 let mut buffers = self.buffers.borrow_mut();
1437 for buffer_state in buffers.values_mut() {
1438 let buffer = buffer_state.buffer.read(cx);
1439 let version = buffer.version();
1440 let parse_count = buffer.parse_count();
1441 let selections_update_count = buffer.selections_update_count();
1442 let diagnostics_update_count = buffer.diagnostics_update_count();
1443 let file_update_count = buffer.file_update_count();
1444 let git_diff_update_count = buffer.git_diff_update_count();
1445
1446 let buffer_edited = version.changed_since(&buffer_state.last_version);
1447 let buffer_reparsed = parse_count > buffer_state.last_parse_count;
1448 let buffer_selections_updated =
1449 selections_update_count > buffer_state.last_selections_update_count;
1450 let buffer_diagnostics_updated =
1451 diagnostics_update_count > buffer_state.last_diagnostics_update_count;
1452 let buffer_file_updated = file_update_count > buffer_state.last_file_update_count;
1453 let buffer_git_diff_updated =
1454 git_diff_update_count > buffer_state.last_git_diff_update_count;
1455 if buffer_edited
1456 || buffer_reparsed
1457 || buffer_selections_updated
1458 || buffer_diagnostics_updated
1459 || buffer_file_updated
1460 || buffer_git_diff_updated
1461 {
1462 buffer_state.last_version = version;
1463 buffer_state.last_parse_count = parse_count;
1464 buffer_state.last_selections_update_count = selections_update_count;
1465 buffer_state.last_diagnostics_update_count = diagnostics_update_count;
1466 buffer_state.last_file_update_count = file_update_count;
1467 buffer_state.last_git_diff_update_count = git_diff_update_count;
1468 excerpts_to_edit.extend(
1469 buffer_state
1470 .excerpts
1471 .iter()
1472 .map(|locator| (locator, buffer_state.buffer.clone(), buffer_edited)),
1473 );
1474 }
1475
1476 edited |= buffer_edited;
1477 reparsed |= buffer_reparsed;
1478 diagnostics_updated |= buffer_diagnostics_updated;
1479 git_diff_updated |= buffer_git_diff_updated;
1480 is_dirty |= buffer.is_dirty();
1481 has_conflict |= buffer.has_conflict();
1482 }
1483 if edited {
1484 snapshot.edit_count += 1;
1485 }
1486 if reparsed {
1487 snapshot.parse_count += 1;
1488 }
1489 if diagnostics_updated {
1490 snapshot.diagnostics_update_count += 1;
1491 }
1492 if git_diff_updated {
1493 snapshot.git_diff_update_count += 1;
1494 }
1495 snapshot.is_dirty = is_dirty;
1496 snapshot.has_conflict = has_conflict;
1497
1498 excerpts_to_edit.sort_unstable_by_key(|(locator, _, _)| *locator);
1499
1500 let mut edits = Vec::new();
1501 let mut new_excerpts = SumTree::new();
1502 let mut cursor = snapshot.excerpts.cursor::<(Option<&Locator>, usize)>();
1503
1504 for (locator, buffer, buffer_edited) in excerpts_to_edit {
1505 new_excerpts.push_tree(cursor.slice(&Some(locator), Bias::Left, &()), &());
1506 let old_excerpt = cursor.item().unwrap();
1507 let buffer = buffer.read(cx);
1508 let buffer_id = buffer.remote_id();
1509
1510 let mut new_excerpt;
1511 if buffer_edited {
1512 edits.extend(
1513 buffer
1514 .edits_since_in_range::<usize>(
1515 old_excerpt.buffer.version(),
1516 old_excerpt.range.context.clone(),
1517 )
1518 .map(|mut edit| {
1519 let excerpt_old_start = cursor.start().1;
1520 let excerpt_new_start = new_excerpts.summary().text.len;
1521 edit.old.start += excerpt_old_start;
1522 edit.old.end += excerpt_old_start;
1523 edit.new.start += excerpt_new_start;
1524 edit.new.end += excerpt_new_start;
1525 edit
1526 }),
1527 );
1528
1529 new_excerpt = Excerpt::new(
1530 old_excerpt.id,
1531 locator.clone(),
1532 buffer_id,
1533 buffer.snapshot(),
1534 old_excerpt.range.clone(),
1535 old_excerpt.has_trailing_newline,
1536 );
1537 } else {
1538 new_excerpt = old_excerpt.clone();
1539 new_excerpt.buffer = buffer.snapshot();
1540 }
1541
1542 new_excerpts.push(new_excerpt, &());
1543 cursor.next(&());
1544 }
1545 new_excerpts.push_tree(cursor.suffix(&()), &());
1546
1547 drop(cursor);
1548 snapshot.excerpts = new_excerpts;
1549
1550 self.subscriptions.publish(edits);
1551 }
1552}
1553
1554#[cfg(any(test, feature = "test-support"))]
1555impl MultiBuffer {
1556 pub fn build_simple(text: &str, cx: &mut gpui::AppContext) -> ModelHandle<Self> {
1557 let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
1558 cx.add_model(|cx| Self::singleton(buffer, cx))
1559 }
1560
1561 pub fn build_from_buffer(
1562 buffer: ModelHandle<Buffer>,
1563 cx: &mut gpui::AppContext,
1564 ) -> ModelHandle<Self> {
1565 cx.add_model(|cx| Self::singleton(buffer, cx))
1566 }
1567
1568 pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::AppContext) -> ModelHandle<Self> {
1569 cx.add_model(|cx| {
1570 let mut multibuffer = MultiBuffer::new(0);
1571 let mutation_count = rng.gen_range(1..=5);
1572 multibuffer.randomly_edit_excerpts(rng, mutation_count, cx);
1573 multibuffer
1574 })
1575 }
1576
1577 pub fn randomly_edit(
1578 &mut self,
1579 rng: &mut impl rand::Rng,
1580 edit_count: usize,
1581 cx: &mut ModelContext<Self>,
1582 ) {
1583 use util::RandomCharIter;
1584
1585 let snapshot = self.read(cx);
1586 let mut edits: Vec<(Range<usize>, Arc<str>)> = Vec::new();
1587 let mut last_end = None;
1588 for _ in 0..edit_count {
1589 if last_end.map_or(false, |last_end| last_end >= snapshot.len()) {
1590 break;
1591 }
1592
1593 let new_start = last_end.map_or(0, |last_end| last_end + 1);
1594 let end = snapshot.clip_offset(rng.gen_range(new_start..=snapshot.len()), Bias::Right);
1595 let start = snapshot.clip_offset(rng.gen_range(new_start..=end), Bias::Right);
1596 last_end = Some(end);
1597
1598 let mut range = start..end;
1599 if rng.gen_bool(0.2) {
1600 mem::swap(&mut range.start, &mut range.end);
1601 }
1602
1603 let new_text_len = rng.gen_range(0..10);
1604 let new_text: String = RandomCharIter::new(&mut *rng).take(new_text_len).collect();
1605
1606 edits.push((range, new_text.into()));
1607 }
1608 log::info!("mutating multi-buffer with {:?}", edits);
1609 drop(snapshot);
1610
1611 self.edit(edits, None, cx);
1612 }
1613
1614 pub fn randomly_edit_excerpts(
1615 &mut self,
1616 rng: &mut impl rand::Rng,
1617 mutation_count: usize,
1618 cx: &mut ModelContext<Self>,
1619 ) {
1620 use rand::prelude::*;
1621 use std::env;
1622 use util::RandomCharIter;
1623
1624 let max_excerpts = env::var("MAX_EXCERPTS")
1625 .map(|i| i.parse().expect("invalid `MAX_EXCERPTS` variable"))
1626 .unwrap_or(5);
1627
1628 let mut buffers = Vec::new();
1629 for _ in 0..mutation_count {
1630 if rng.gen_bool(0.05) {
1631 log::info!("Clearing multi-buffer");
1632 self.clear(cx);
1633 continue;
1634 }
1635
1636 let excerpt_ids = self.excerpt_ids();
1637 if excerpt_ids.is_empty() || (rng.gen() && excerpt_ids.len() < max_excerpts) {
1638 let buffer_handle = if rng.gen() || self.buffers.borrow().is_empty() {
1639 let text = RandomCharIter::new(&mut *rng).take(10).collect::<String>();
1640 buffers.push(cx.add_model(|cx| Buffer::new(0, text, cx)));
1641 let buffer = buffers.last().unwrap().read(cx);
1642 log::info!(
1643 "Creating new buffer {} with text: {:?}",
1644 buffer.remote_id(),
1645 buffer.text()
1646 );
1647 buffers.last().unwrap().clone()
1648 } else {
1649 self.buffers
1650 .borrow()
1651 .values()
1652 .choose(rng)
1653 .unwrap()
1654 .buffer
1655 .clone()
1656 };
1657
1658 let buffer = buffer_handle.read(cx);
1659 let buffer_text = buffer.text();
1660 let ranges = (0..rng.gen_range(0..5))
1661 .map(|_| {
1662 let end_ix =
1663 buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
1664 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
1665 ExcerptRange {
1666 context: start_ix..end_ix,
1667 primary: None,
1668 }
1669 })
1670 .collect::<Vec<_>>();
1671 log::info!(
1672 "Inserting excerpts from buffer {} and ranges {:?}: {:?}",
1673 buffer_handle.read(cx).remote_id(),
1674 ranges.iter().map(|r| &r.context).collect::<Vec<_>>(),
1675 ranges
1676 .iter()
1677 .map(|r| &buffer_text[r.context.clone()])
1678 .collect::<Vec<_>>()
1679 );
1680
1681 let excerpt_id = self.push_excerpts(buffer_handle.clone(), ranges, cx);
1682 log::info!("Inserted with ids: {:?}", excerpt_id);
1683 } else {
1684 let remove_count = rng.gen_range(1..=excerpt_ids.len());
1685 let mut excerpts_to_remove = excerpt_ids
1686 .choose_multiple(rng, remove_count)
1687 .cloned()
1688 .collect::<Vec<_>>();
1689 let snapshot = self.snapshot.borrow();
1690 excerpts_to_remove.sort_unstable_by(|a, b| a.cmp(b, &*snapshot));
1691 drop(snapshot);
1692 log::info!("Removing excerpts {:?}", excerpts_to_remove);
1693 self.remove_excerpts(excerpts_to_remove, cx);
1694 }
1695 }
1696 }
1697
1698 pub fn randomly_mutate(
1699 &mut self,
1700 rng: &mut impl rand::Rng,
1701 mutation_count: usize,
1702 cx: &mut ModelContext<Self>,
1703 ) {
1704 use rand::prelude::*;
1705
1706 if rng.gen_bool(0.7) || self.singleton {
1707 let buffer = self
1708 .buffers
1709 .borrow()
1710 .values()
1711 .choose(rng)
1712 .map(|state| state.buffer.clone());
1713
1714 if let Some(buffer) = buffer {
1715 buffer.update(cx, |buffer, cx| {
1716 if rng.gen() {
1717 buffer.randomly_edit(rng, mutation_count, cx);
1718 } else {
1719 buffer.randomly_undo_redo(rng, cx);
1720 }
1721 });
1722 } else {
1723 self.randomly_edit(rng, mutation_count, cx);
1724 }
1725 } else {
1726 self.randomly_edit_excerpts(rng, mutation_count, cx);
1727 }
1728
1729 self.check_invariants(cx);
1730 }
1731
1732 fn check_invariants(&self, cx: &mut ModelContext<Self>) {
1733 let snapshot = self.read(cx);
1734 let excerpts = snapshot.excerpts.items(&());
1735 let excerpt_ids = snapshot.excerpt_ids.items(&());
1736
1737 for (ix, excerpt) in excerpts.iter().enumerate() {
1738 if ix == 0 {
1739 if excerpt.locator <= Locator::min() {
1740 panic!("invalid first excerpt locator {:?}", excerpt.locator);
1741 }
1742 } else {
1743 if excerpt.locator <= excerpts[ix - 1].locator {
1744 panic!("excerpts are out-of-order: {:?}", excerpts);
1745 }
1746 }
1747 }
1748
1749 for (ix, entry) in excerpt_ids.iter().enumerate() {
1750 if ix == 0 {
1751 if entry.id.cmp(&ExcerptId::min(), &*snapshot).is_le() {
1752 panic!("invalid first excerpt id {:?}", entry.id);
1753 }
1754 } else {
1755 if entry.id <= excerpt_ids[ix - 1].id {
1756 panic!("excerpt ids are out-of-order: {:?}", excerpt_ids);
1757 }
1758 }
1759 }
1760 }
1761}
1762
1763impl Entity for MultiBuffer {
1764 type Event = Event;
1765}
1766
1767impl MultiBufferSnapshot {
1768 pub fn text(&self) -> String {
1769 self.chunks(0..self.len(), false)
1770 .map(|chunk| chunk.text)
1771 .collect()
1772 }
1773
1774 pub fn reversed_chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
1775 let mut offset = position.to_offset(self);
1776 let mut cursor = self.excerpts.cursor::<usize>();
1777 cursor.seek(&offset, Bias::Left, &());
1778 let mut excerpt_chunks = cursor.item().map(|excerpt| {
1779 let end_before_footer = cursor.start() + excerpt.text_summary.len;
1780 let start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1781 let end = start + (cmp::min(offset, end_before_footer) - cursor.start());
1782 excerpt.buffer.reversed_chunks_in_range(start..end)
1783 });
1784 iter::from_fn(move || {
1785 if offset == *cursor.start() {
1786 cursor.prev(&());
1787 let excerpt = cursor.item()?;
1788 excerpt_chunks = Some(
1789 excerpt
1790 .buffer
1791 .reversed_chunks_in_range(excerpt.range.context.clone()),
1792 );
1793 }
1794
1795 let excerpt = cursor.item().unwrap();
1796 if offset == cursor.end(&()) && excerpt.has_trailing_newline {
1797 offset -= 1;
1798 Some("\n")
1799 } else {
1800 let chunk = excerpt_chunks.as_mut().unwrap().next().unwrap();
1801 offset -= chunk.len();
1802 Some(chunk)
1803 }
1804 })
1805 .flat_map(|c| c.chars().rev())
1806 }
1807
1808 pub fn chars_at<T: ToOffset>(&self, position: T) -> impl Iterator<Item = char> + '_ {
1809 let offset = position.to_offset(self);
1810 self.text_for_range(offset..self.len())
1811 .flat_map(|chunk| chunk.chars())
1812 }
1813
1814 pub fn text_for_range<T: ToOffset>(&self, range: Range<T>) -> impl Iterator<Item = &str> + '_ {
1815 self.chunks(range, false).map(|chunk| chunk.text)
1816 }
1817
1818 pub fn is_line_blank(&self, row: u32) -> bool {
1819 self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
1820 .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
1821 }
1822
1823 pub fn contains_str_at<T>(&self, position: T, needle: &str) -> bool
1824 where
1825 T: ToOffset,
1826 {
1827 let position = position.to_offset(self);
1828 position == self.clip_offset(position, Bias::Left)
1829 && self
1830 .bytes_in_range(position..self.len())
1831 .flatten()
1832 .copied()
1833 .take(needle.len())
1834 .eq(needle.bytes())
1835 }
1836
1837 pub fn surrounding_word<T: ToOffset>(&self, start: T) -> (Range<usize>, Option<CharKind>) {
1838 let mut start = start.to_offset(self);
1839 let mut end = start;
1840 let mut next_chars = self.chars_at(start).peekable();
1841 let mut prev_chars = self.reversed_chars_at(start).peekable();
1842 let word_kind = cmp::max(
1843 prev_chars.peek().copied().map(char_kind),
1844 next_chars.peek().copied().map(char_kind),
1845 );
1846
1847 for ch in prev_chars {
1848 if Some(char_kind(ch)) == word_kind && ch != '\n' {
1849 start -= ch.len_utf8();
1850 } else {
1851 break;
1852 }
1853 }
1854
1855 for ch in next_chars {
1856 if Some(char_kind(ch)) == word_kind && ch != '\n' {
1857 end += ch.len_utf8();
1858 } else {
1859 break;
1860 }
1861 }
1862
1863 (start..end, word_kind)
1864 }
1865
1866 pub fn as_singleton(&self) -> Option<(&ExcerptId, u64, &BufferSnapshot)> {
1867 if self.singleton {
1868 self.excerpts
1869 .iter()
1870 .next()
1871 .map(|e| (&e.id, e.buffer_id, &e.buffer))
1872 } else {
1873 None
1874 }
1875 }
1876
1877 pub fn len(&self) -> usize {
1878 self.excerpts.summary().text.len
1879 }
1880
1881 pub fn is_empty(&self) -> bool {
1882 self.excerpts.summary().text.len == 0
1883 }
1884
1885 pub fn max_buffer_row(&self) -> u32 {
1886 self.excerpts.summary().max_buffer_row
1887 }
1888
1889 pub fn clip_offset(&self, offset: usize, bias: Bias) -> usize {
1890 if let Some((_, _, buffer)) = self.as_singleton() {
1891 return buffer.clip_offset(offset, bias);
1892 }
1893
1894 let mut cursor = self.excerpts.cursor::<usize>();
1895 cursor.seek(&offset, Bias::Right, &());
1896 let overshoot = if let Some(excerpt) = cursor.item() {
1897 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
1898 let buffer_offset = excerpt
1899 .buffer
1900 .clip_offset(excerpt_start + (offset - cursor.start()), bias);
1901 buffer_offset.saturating_sub(excerpt_start)
1902 } else {
1903 0
1904 };
1905 cursor.start() + overshoot
1906 }
1907
1908 pub fn clip_point(&self, point: Point, bias: Bias) -> Point {
1909 if let Some((_, _, buffer)) = self.as_singleton() {
1910 return buffer.clip_point(point, bias);
1911 }
1912
1913 let mut cursor = self.excerpts.cursor::<Point>();
1914 cursor.seek(&point, Bias::Right, &());
1915 let overshoot = if let Some(excerpt) = cursor.item() {
1916 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
1917 let buffer_point = excerpt
1918 .buffer
1919 .clip_point(excerpt_start + (point - cursor.start()), bias);
1920 buffer_point.saturating_sub(excerpt_start)
1921 } else {
1922 Point::zero()
1923 };
1924 *cursor.start() + overshoot
1925 }
1926
1927 pub fn clip_offset_utf16(&self, offset: OffsetUtf16, bias: Bias) -> OffsetUtf16 {
1928 if let Some((_, _, buffer)) = self.as_singleton() {
1929 return buffer.clip_offset_utf16(offset, bias);
1930 }
1931
1932 let mut cursor = self.excerpts.cursor::<OffsetUtf16>();
1933 cursor.seek(&offset, Bias::Right, &());
1934 let overshoot = if let Some(excerpt) = cursor.item() {
1935 let excerpt_start = excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
1936 let buffer_offset = excerpt
1937 .buffer
1938 .clip_offset_utf16(excerpt_start + (offset - cursor.start()), bias);
1939 OffsetUtf16(buffer_offset.0.saturating_sub(excerpt_start.0))
1940 } else {
1941 OffsetUtf16(0)
1942 };
1943 *cursor.start() + overshoot
1944 }
1945
1946 pub fn clip_point_utf16(&self, point: Unclipped<PointUtf16>, bias: Bias) -> PointUtf16 {
1947 if let Some((_, _, buffer)) = self.as_singleton() {
1948 return buffer.clip_point_utf16(point, bias);
1949 }
1950
1951 let mut cursor = self.excerpts.cursor::<PointUtf16>();
1952 cursor.seek(&point.0, Bias::Right, &());
1953 let overshoot = if let Some(excerpt) = cursor.item() {
1954 let excerpt_start = excerpt
1955 .buffer
1956 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
1957 let buffer_point = excerpt
1958 .buffer
1959 .clip_point_utf16(Unclipped(excerpt_start + (point.0 - cursor.start())), bias);
1960 buffer_point.saturating_sub(excerpt_start)
1961 } else {
1962 PointUtf16::zero()
1963 };
1964 *cursor.start() + overshoot
1965 }
1966
1967 pub fn bytes_in_range<T: ToOffset>(&self, range: Range<T>) -> MultiBufferBytes {
1968 let range = range.start.to_offset(self)..range.end.to_offset(self);
1969 let mut excerpts = self.excerpts.cursor::<usize>();
1970 excerpts.seek(&range.start, Bias::Right, &());
1971
1972 let mut chunk = &[][..];
1973 let excerpt_bytes = if let Some(excerpt) = excerpts.item() {
1974 let mut excerpt_bytes = excerpt
1975 .bytes_in_range(range.start - excerpts.start()..range.end - excerpts.start());
1976 chunk = excerpt_bytes.next().unwrap_or(&[][..]);
1977 Some(excerpt_bytes)
1978 } else {
1979 None
1980 };
1981
1982 MultiBufferBytes {
1983 range,
1984 excerpts,
1985 excerpt_bytes,
1986 chunk,
1987 }
1988 }
1989
1990 pub fn buffer_rows(&self, start_row: u32) -> MultiBufferRows {
1991 let mut result = MultiBufferRows {
1992 buffer_row_range: 0..0,
1993 excerpts: self.excerpts.cursor(),
1994 };
1995 result.seek(start_row);
1996 result
1997 }
1998
1999 pub fn chunks<T: ToOffset>(&self, range: Range<T>, language_aware: bool) -> MultiBufferChunks {
2000 let range = range.start.to_offset(self)..range.end.to_offset(self);
2001 let mut chunks = MultiBufferChunks {
2002 range: range.clone(),
2003 excerpts: self.excerpts.cursor(),
2004 excerpt_chunks: None,
2005 language_aware,
2006 };
2007 chunks.seek(range.start);
2008 chunks
2009 }
2010
2011 pub fn offset_to_point(&self, offset: usize) -> Point {
2012 if let Some((_, _, buffer)) = self.as_singleton() {
2013 return buffer.offset_to_point(offset);
2014 }
2015
2016 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
2017 cursor.seek(&offset, Bias::Right, &());
2018 if let Some(excerpt) = cursor.item() {
2019 let (start_offset, start_point) = cursor.start();
2020 let overshoot = offset - start_offset;
2021 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2022 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2023 let buffer_point = excerpt
2024 .buffer
2025 .offset_to_point(excerpt_start_offset + overshoot);
2026 *start_point + (buffer_point - excerpt_start_point)
2027 } else {
2028 self.excerpts.summary().text.lines
2029 }
2030 }
2031
2032 pub fn offset_to_point_utf16(&self, offset: usize) -> PointUtf16 {
2033 if let Some((_, _, buffer)) = self.as_singleton() {
2034 return buffer.offset_to_point_utf16(offset);
2035 }
2036
2037 let mut cursor = self.excerpts.cursor::<(usize, PointUtf16)>();
2038 cursor.seek(&offset, Bias::Right, &());
2039 if let Some(excerpt) = cursor.item() {
2040 let (start_offset, start_point) = cursor.start();
2041 let overshoot = offset - start_offset;
2042 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2043 let excerpt_start_point = excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
2044 let buffer_point = excerpt
2045 .buffer
2046 .offset_to_point_utf16(excerpt_start_offset + overshoot);
2047 *start_point + (buffer_point - excerpt_start_point)
2048 } else {
2049 self.excerpts.summary().text.lines_utf16()
2050 }
2051 }
2052
2053 pub fn point_to_point_utf16(&self, point: Point) -> PointUtf16 {
2054 if let Some((_, _, buffer)) = self.as_singleton() {
2055 return buffer.point_to_point_utf16(point);
2056 }
2057
2058 let mut cursor = self.excerpts.cursor::<(Point, PointUtf16)>();
2059 cursor.seek(&point, Bias::Right, &());
2060 if let Some(excerpt) = cursor.item() {
2061 let (start_offset, start_point) = cursor.start();
2062 let overshoot = point - start_offset;
2063 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2064 let excerpt_start_point_utf16 =
2065 excerpt.range.context.start.to_point_utf16(&excerpt.buffer);
2066 let buffer_point = excerpt
2067 .buffer
2068 .point_to_point_utf16(excerpt_start_point + overshoot);
2069 *start_point + (buffer_point - excerpt_start_point_utf16)
2070 } else {
2071 self.excerpts.summary().text.lines_utf16()
2072 }
2073 }
2074
2075 pub fn point_to_offset(&self, point: Point) -> usize {
2076 if let Some((_, _, buffer)) = self.as_singleton() {
2077 return buffer.point_to_offset(point);
2078 }
2079
2080 let mut cursor = self.excerpts.cursor::<(Point, usize)>();
2081 cursor.seek(&point, Bias::Right, &());
2082 if let Some(excerpt) = cursor.item() {
2083 let (start_point, start_offset) = cursor.start();
2084 let overshoot = point - start_point;
2085 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2086 let excerpt_start_point = excerpt.range.context.start.to_point(&excerpt.buffer);
2087 let buffer_offset = excerpt
2088 .buffer
2089 .point_to_offset(excerpt_start_point + overshoot);
2090 *start_offset + buffer_offset - excerpt_start_offset
2091 } else {
2092 self.excerpts.summary().text.len
2093 }
2094 }
2095
2096 pub fn offset_utf16_to_offset(&self, offset_utf16: OffsetUtf16) -> usize {
2097 if let Some((_, _, buffer)) = self.as_singleton() {
2098 return buffer.offset_utf16_to_offset(offset_utf16);
2099 }
2100
2101 let mut cursor = self.excerpts.cursor::<(OffsetUtf16, usize)>();
2102 cursor.seek(&offset_utf16, Bias::Right, &());
2103 if let Some(excerpt) = cursor.item() {
2104 let (start_offset_utf16, start_offset) = cursor.start();
2105 let overshoot = offset_utf16 - start_offset_utf16;
2106 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2107 let excerpt_start_offset_utf16 =
2108 excerpt.buffer.offset_to_offset_utf16(excerpt_start_offset);
2109 let buffer_offset = excerpt
2110 .buffer
2111 .offset_utf16_to_offset(excerpt_start_offset_utf16 + overshoot);
2112 *start_offset + (buffer_offset - excerpt_start_offset)
2113 } else {
2114 self.excerpts.summary().text.len
2115 }
2116 }
2117
2118 pub fn offset_to_offset_utf16(&self, offset: usize) -> OffsetUtf16 {
2119 if let Some((_, _, buffer)) = self.as_singleton() {
2120 return buffer.offset_to_offset_utf16(offset);
2121 }
2122
2123 let mut cursor = self.excerpts.cursor::<(usize, OffsetUtf16)>();
2124 cursor.seek(&offset, Bias::Right, &());
2125 if let Some(excerpt) = cursor.item() {
2126 let (start_offset, start_offset_utf16) = cursor.start();
2127 let overshoot = offset - start_offset;
2128 let excerpt_start_offset_utf16 =
2129 excerpt.range.context.start.to_offset_utf16(&excerpt.buffer);
2130 let excerpt_start_offset = excerpt
2131 .buffer
2132 .offset_utf16_to_offset(excerpt_start_offset_utf16);
2133 let buffer_offset_utf16 = excerpt
2134 .buffer
2135 .offset_to_offset_utf16(excerpt_start_offset + overshoot);
2136 *start_offset_utf16 + (buffer_offset_utf16 - excerpt_start_offset_utf16)
2137 } else {
2138 self.excerpts.summary().text.len_utf16
2139 }
2140 }
2141
2142 pub fn point_utf16_to_offset(&self, point: PointUtf16) -> usize {
2143 if let Some((_, _, buffer)) = self.as_singleton() {
2144 return buffer.point_utf16_to_offset(point);
2145 }
2146
2147 let mut cursor = self.excerpts.cursor::<(PointUtf16, usize)>();
2148 cursor.seek(&point, Bias::Right, &());
2149 if let Some(excerpt) = cursor.item() {
2150 let (start_point, start_offset) = cursor.start();
2151 let overshoot = point - start_point;
2152 let excerpt_start_offset = excerpt.range.context.start.to_offset(&excerpt.buffer);
2153 let excerpt_start_point = excerpt
2154 .buffer
2155 .offset_to_point_utf16(excerpt.range.context.start.to_offset(&excerpt.buffer));
2156 let buffer_offset = excerpt
2157 .buffer
2158 .point_utf16_to_offset(excerpt_start_point + overshoot);
2159 *start_offset + (buffer_offset - excerpt_start_offset)
2160 } else {
2161 self.excerpts.summary().text.len
2162 }
2163 }
2164
2165 pub fn point_to_buffer_offset<T: ToOffset>(
2166 &self,
2167 point: T,
2168 ) -> Option<(&BufferSnapshot, usize)> {
2169 let offset = point.to_offset(&self);
2170 let mut cursor = self.excerpts.cursor::<usize>();
2171 cursor.seek(&offset, Bias::Right, &());
2172 if cursor.item().is_none() {
2173 cursor.prev(&());
2174 }
2175
2176 cursor.item().map(|excerpt| {
2177 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2178 let buffer_point = excerpt_start + offset - *cursor.start();
2179 (&excerpt.buffer, buffer_point)
2180 })
2181 }
2182
2183 pub fn suggested_indents(
2184 &self,
2185 rows: impl IntoIterator<Item = u32>,
2186 cx: &AppContext,
2187 ) -> BTreeMap<u32, IndentSize> {
2188 let mut result = BTreeMap::new();
2189
2190 let mut rows_for_excerpt = Vec::new();
2191 let mut cursor = self.excerpts.cursor::<Point>();
2192 let mut rows = rows.into_iter().peekable();
2193 let mut prev_row = u32::MAX;
2194 let mut prev_language_indent_size = IndentSize::default();
2195
2196 while let Some(row) = rows.next() {
2197 cursor.seek(&Point::new(row, 0), Bias::Right, &());
2198 let excerpt = match cursor.item() {
2199 Some(excerpt) => excerpt,
2200 _ => continue,
2201 };
2202
2203 // Retrieve the language and indent size once for each disjoint region being indented.
2204 let single_indent_size = if row.saturating_sub(1) == prev_row {
2205 prev_language_indent_size
2206 } else {
2207 excerpt
2208 .buffer
2209 .language_indent_size_at(Point::new(row, 0), cx)
2210 };
2211 prev_language_indent_size = single_indent_size;
2212 prev_row = row;
2213
2214 let start_buffer_row = excerpt.range.context.start.to_point(&excerpt.buffer).row;
2215 let start_multibuffer_row = cursor.start().row;
2216
2217 rows_for_excerpt.push(row);
2218 while let Some(next_row) = rows.peek().copied() {
2219 if cursor.end(&()).row > next_row {
2220 rows_for_excerpt.push(next_row);
2221 rows.next();
2222 } else {
2223 break;
2224 }
2225 }
2226
2227 let buffer_rows = rows_for_excerpt
2228 .drain(..)
2229 .map(|row| start_buffer_row + row - start_multibuffer_row);
2230 let buffer_indents = excerpt
2231 .buffer
2232 .suggested_indents(buffer_rows, single_indent_size);
2233 let multibuffer_indents = buffer_indents
2234 .into_iter()
2235 .map(|(row, indent)| (start_multibuffer_row + row - start_buffer_row, indent));
2236 result.extend(multibuffer_indents);
2237 }
2238
2239 result
2240 }
2241
2242 pub fn indent_size_for_line(&self, row: u32) -> IndentSize {
2243 if let Some((buffer, range)) = self.buffer_line_for_row(row) {
2244 let mut size = buffer.indent_size_for_line(range.start.row);
2245 size.len = size
2246 .len
2247 .min(range.end.column)
2248 .saturating_sub(range.start.column);
2249 size
2250 } else {
2251 IndentSize::spaces(0)
2252 }
2253 }
2254
2255 pub fn line_len(&self, row: u32) -> u32 {
2256 if let Some((_, range)) = self.buffer_line_for_row(row) {
2257 range.end.column - range.start.column
2258 } else {
2259 0
2260 }
2261 }
2262
2263 pub fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
2264 let mut cursor = self.excerpts.cursor::<Point>();
2265 let point = Point::new(row, 0);
2266 cursor.seek(&point, Bias::Right, &());
2267 if cursor.item().is_none() && *cursor.start() == point {
2268 cursor.prev(&());
2269 }
2270 if let Some(excerpt) = cursor.item() {
2271 let overshoot = row - cursor.start().row;
2272 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
2273 let excerpt_end = excerpt.range.context.end.to_point(&excerpt.buffer);
2274 let buffer_row = excerpt_start.row + overshoot;
2275 let line_start = Point::new(buffer_row, 0);
2276 let line_end = Point::new(buffer_row, excerpt.buffer.line_len(buffer_row));
2277 return Some((
2278 &excerpt.buffer,
2279 line_start.max(excerpt_start)..line_end.min(excerpt_end),
2280 ));
2281 }
2282 None
2283 }
2284
2285 pub fn max_point(&self) -> Point {
2286 self.text_summary().lines
2287 }
2288
2289 pub fn text_summary(&self) -> TextSummary {
2290 self.excerpts.summary().text.clone()
2291 }
2292
2293 pub fn text_summary_for_range<D, O>(&self, range: Range<O>) -> D
2294 where
2295 D: TextDimension,
2296 O: ToOffset,
2297 {
2298 let mut summary = D::default();
2299 let mut range = range.start.to_offset(self)..range.end.to_offset(self);
2300 let mut cursor = self.excerpts.cursor::<usize>();
2301 cursor.seek(&range.start, Bias::Right, &());
2302 if let Some(excerpt) = cursor.item() {
2303 let mut end_before_newline = cursor.end(&());
2304 if excerpt.has_trailing_newline {
2305 end_before_newline -= 1;
2306 }
2307
2308 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2309 let start_in_excerpt = excerpt_start + (range.start - cursor.start());
2310 let end_in_excerpt =
2311 excerpt_start + (cmp::min(end_before_newline, range.end) - cursor.start());
2312 summary.add_assign(
2313 &excerpt
2314 .buffer
2315 .text_summary_for_range(start_in_excerpt..end_in_excerpt),
2316 );
2317
2318 if range.end > end_before_newline {
2319 summary.add_assign(&D::from_text_summary(&TextSummary::from("\n")));
2320 }
2321
2322 cursor.next(&());
2323 }
2324
2325 if range.end > *cursor.start() {
2326 summary.add_assign(&D::from_text_summary(&cursor.summary::<_, TextSummary>(
2327 &range.end,
2328 Bias::Right,
2329 &(),
2330 )));
2331 if let Some(excerpt) = cursor.item() {
2332 range.end = cmp::max(*cursor.start(), range.end);
2333
2334 let excerpt_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2335 let end_in_excerpt = excerpt_start + (range.end - cursor.start());
2336 summary.add_assign(
2337 &excerpt
2338 .buffer
2339 .text_summary_for_range(excerpt_start..end_in_excerpt),
2340 );
2341 }
2342 }
2343
2344 summary
2345 }
2346
2347 pub fn summary_for_anchor<D>(&self, anchor: &Anchor) -> D
2348 where
2349 D: TextDimension + Ord + Sub<D, Output = D>,
2350 {
2351 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2352 let locator = self.excerpt_locator_for_id(anchor.excerpt_id);
2353
2354 cursor.seek(locator, Bias::Left, &());
2355 if cursor.item().is_none() {
2356 cursor.next(&());
2357 }
2358
2359 let mut position = D::from_text_summary(&cursor.start().text);
2360 if let Some(excerpt) = cursor.item() {
2361 if excerpt.id == anchor.excerpt_id {
2362 let excerpt_buffer_start =
2363 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2364 let excerpt_buffer_end = excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2365 let buffer_position = cmp::min(
2366 excerpt_buffer_end,
2367 anchor.text_anchor.summary::<D>(&excerpt.buffer),
2368 );
2369 if buffer_position > excerpt_buffer_start {
2370 position.add_assign(&(buffer_position - excerpt_buffer_start));
2371 }
2372 }
2373 }
2374 position
2375 }
2376
2377 pub fn summaries_for_anchors<'a, D, I>(&'a self, anchors: I) -> Vec<D>
2378 where
2379 D: TextDimension + Ord + Sub<D, Output = D>,
2380 I: 'a + IntoIterator<Item = &'a Anchor>,
2381 {
2382 if let Some((_, _, buffer)) = self.as_singleton() {
2383 return buffer
2384 .summaries_for_anchors(anchors.into_iter().map(|a| &a.text_anchor))
2385 .collect();
2386 }
2387
2388 let mut anchors = anchors.into_iter().peekable();
2389 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
2390 let mut summaries = Vec::new();
2391 while let Some(anchor) = anchors.peek() {
2392 let excerpt_id = anchor.excerpt_id;
2393 let excerpt_anchors = iter::from_fn(|| {
2394 let anchor = anchors.peek()?;
2395 if anchor.excerpt_id == excerpt_id {
2396 Some(&anchors.next().unwrap().text_anchor)
2397 } else {
2398 None
2399 }
2400 });
2401
2402 let locator = self.excerpt_locator_for_id(excerpt_id);
2403 cursor.seek_forward(locator, Bias::Left, &());
2404 if cursor.item().is_none() {
2405 cursor.next(&());
2406 }
2407
2408 let position = D::from_text_summary(&cursor.start().text);
2409 if let Some(excerpt) = cursor.item() {
2410 if excerpt.id == excerpt_id {
2411 let excerpt_buffer_start =
2412 excerpt.range.context.start.summary::<D>(&excerpt.buffer);
2413 let excerpt_buffer_end =
2414 excerpt.range.context.end.summary::<D>(&excerpt.buffer);
2415 summaries.extend(
2416 excerpt
2417 .buffer
2418 .summaries_for_anchors::<D, _>(excerpt_anchors)
2419 .map(move |summary| {
2420 let summary = cmp::min(excerpt_buffer_end.clone(), summary);
2421 let mut position = position.clone();
2422 let excerpt_buffer_start = excerpt_buffer_start.clone();
2423 if summary > excerpt_buffer_start {
2424 position.add_assign(&(summary - excerpt_buffer_start));
2425 }
2426 position
2427 }),
2428 );
2429 continue;
2430 }
2431 }
2432
2433 summaries.extend(excerpt_anchors.map(|_| position.clone()));
2434 }
2435
2436 summaries
2437 }
2438
2439 pub fn refresh_anchors<'a, I>(&'a self, anchors: I) -> Vec<(usize, Anchor, bool)>
2440 where
2441 I: 'a + IntoIterator<Item = &'a Anchor>,
2442 {
2443 let mut anchors = anchors.into_iter().enumerate().peekable();
2444 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2445 cursor.next(&());
2446
2447 let mut result = Vec::new();
2448
2449 while let Some((_, anchor)) = anchors.peek() {
2450 let old_excerpt_id = anchor.excerpt_id;
2451
2452 // Find the location where this anchor's excerpt should be.
2453 let old_locator = self.excerpt_locator_for_id(old_excerpt_id);
2454 cursor.seek_forward(&Some(old_locator), Bias::Left, &());
2455
2456 if cursor.item().is_none() {
2457 cursor.next(&());
2458 }
2459
2460 let next_excerpt = cursor.item();
2461 let prev_excerpt = cursor.prev_item();
2462
2463 // Process all of the anchors for this excerpt.
2464 while let Some((_, anchor)) = anchors.peek() {
2465 if anchor.excerpt_id != old_excerpt_id {
2466 break;
2467 }
2468 let (anchor_ix, anchor) = anchors.next().unwrap();
2469 let mut anchor = *anchor;
2470
2471 // Leave min and max anchors unchanged if invalid or
2472 // if the old excerpt still exists at this location
2473 let mut kept_position = next_excerpt
2474 .map_or(false, |e| e.id == old_excerpt_id && e.contains(&anchor))
2475 || old_excerpt_id == ExcerptId::max()
2476 || old_excerpt_id == ExcerptId::min();
2477
2478 // If the old excerpt no longer exists at this location, then attempt to
2479 // find an equivalent position for this anchor in an adjacent excerpt.
2480 if !kept_position {
2481 for excerpt in [next_excerpt, prev_excerpt].iter().filter_map(|e| *e) {
2482 if excerpt.contains(&anchor) {
2483 anchor.excerpt_id = excerpt.id.clone();
2484 kept_position = true;
2485 break;
2486 }
2487 }
2488 }
2489
2490 // If there's no adjacent excerpt that contains the anchor's position,
2491 // then report that the anchor has lost its position.
2492 if !kept_position {
2493 anchor = if let Some(excerpt) = next_excerpt {
2494 let mut text_anchor = excerpt
2495 .range
2496 .context
2497 .start
2498 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2499 if text_anchor
2500 .cmp(&excerpt.range.context.end, &excerpt.buffer)
2501 .is_gt()
2502 {
2503 text_anchor = excerpt.range.context.end;
2504 }
2505 Anchor {
2506 buffer_id: Some(excerpt.buffer_id),
2507 excerpt_id: excerpt.id.clone(),
2508 text_anchor,
2509 }
2510 } else if let Some(excerpt) = prev_excerpt {
2511 let mut text_anchor = excerpt
2512 .range
2513 .context
2514 .end
2515 .bias(anchor.text_anchor.bias, &excerpt.buffer);
2516 if text_anchor
2517 .cmp(&excerpt.range.context.start, &excerpt.buffer)
2518 .is_lt()
2519 {
2520 text_anchor = excerpt.range.context.start;
2521 }
2522 Anchor {
2523 buffer_id: Some(excerpt.buffer_id),
2524 excerpt_id: excerpt.id.clone(),
2525 text_anchor,
2526 }
2527 } else if anchor.text_anchor.bias == Bias::Left {
2528 Anchor::min()
2529 } else {
2530 Anchor::max()
2531 };
2532 }
2533
2534 result.push((anchor_ix, anchor, kept_position));
2535 }
2536 }
2537 result.sort_unstable_by(|a, b| a.1.cmp(&b.1, self));
2538 result
2539 }
2540
2541 pub fn anchor_before<T: ToOffset>(&self, position: T) -> Anchor {
2542 self.anchor_at(position, Bias::Left)
2543 }
2544
2545 pub fn anchor_after<T: ToOffset>(&self, position: T) -> Anchor {
2546 self.anchor_at(position, Bias::Right)
2547 }
2548
2549 pub fn anchor_at<T: ToOffset>(&self, position: T, mut bias: Bias) -> Anchor {
2550 let offset = position.to_offset(self);
2551 if let Some((excerpt_id, buffer_id, buffer)) = self.as_singleton() {
2552 return Anchor {
2553 buffer_id: Some(buffer_id),
2554 excerpt_id: excerpt_id.clone(),
2555 text_anchor: buffer.anchor_at(offset, bias),
2556 };
2557 }
2558
2559 let mut cursor = self.excerpts.cursor::<(usize, Option<ExcerptId>)>();
2560 cursor.seek(&offset, Bias::Right, &());
2561 if cursor.item().is_none() && offset == cursor.start().0 && bias == Bias::Left {
2562 cursor.prev(&());
2563 }
2564 if let Some(excerpt) = cursor.item() {
2565 let mut overshoot = offset.saturating_sub(cursor.start().0);
2566 if excerpt.has_trailing_newline && offset == cursor.end(&()).0 {
2567 overshoot -= 1;
2568 bias = Bias::Right;
2569 }
2570
2571 let buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2572 let text_anchor =
2573 excerpt.clip_anchor(excerpt.buffer.anchor_at(buffer_start + overshoot, bias));
2574 Anchor {
2575 buffer_id: Some(excerpt.buffer_id),
2576 excerpt_id: excerpt.id.clone(),
2577 text_anchor,
2578 }
2579 } else if offset == 0 && bias == Bias::Left {
2580 Anchor::min()
2581 } else {
2582 Anchor::max()
2583 }
2584 }
2585
2586 pub fn anchor_in_excerpt(&self, excerpt_id: ExcerptId, text_anchor: text::Anchor) -> Anchor {
2587 let locator = self.excerpt_locator_for_id(excerpt_id);
2588 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
2589 cursor.seek(locator, Bias::Left, &());
2590 if let Some(excerpt) = cursor.item() {
2591 if excerpt.id == excerpt_id {
2592 let text_anchor = excerpt.clip_anchor(text_anchor);
2593 drop(cursor);
2594 return Anchor {
2595 buffer_id: Some(excerpt.buffer_id),
2596 excerpt_id,
2597 text_anchor,
2598 };
2599 }
2600 }
2601 panic!("excerpt not found");
2602 }
2603
2604 pub fn can_resolve(&self, anchor: &Anchor) -> bool {
2605 if anchor.excerpt_id == ExcerptId::min() || anchor.excerpt_id == ExcerptId::max() {
2606 true
2607 } else if let Some(excerpt) = self.excerpt(anchor.excerpt_id) {
2608 excerpt.buffer.can_resolve(&anchor.text_anchor)
2609 } else {
2610 false
2611 }
2612 }
2613
2614 pub fn excerpts(
2615 &self,
2616 ) -> impl Iterator<Item = (ExcerptId, &BufferSnapshot, ExcerptRange<text::Anchor>)> {
2617 self.excerpts
2618 .iter()
2619 .map(|excerpt| (excerpt.id, &excerpt.buffer, excerpt.range.clone()))
2620 }
2621
2622 pub fn excerpt_boundaries_in_range<R, T>(
2623 &self,
2624 range: R,
2625 ) -> impl Iterator<Item = ExcerptBoundary> + '_
2626 where
2627 R: RangeBounds<T>,
2628 T: ToOffset,
2629 {
2630 let start_offset;
2631 let start = match range.start_bound() {
2632 Bound::Included(start) => {
2633 start_offset = start.to_offset(self);
2634 Bound::Included(start_offset)
2635 }
2636 Bound::Excluded(start) => {
2637 start_offset = start.to_offset(self);
2638 Bound::Excluded(start_offset)
2639 }
2640 Bound::Unbounded => {
2641 start_offset = 0;
2642 Bound::Unbounded
2643 }
2644 };
2645 let end = match range.end_bound() {
2646 Bound::Included(end) => Bound::Included(end.to_offset(self)),
2647 Bound::Excluded(end) => Bound::Excluded(end.to_offset(self)),
2648 Bound::Unbounded => Bound::Unbounded,
2649 };
2650 let bounds = (start, end);
2651
2652 let mut cursor = self.excerpts.cursor::<(usize, Point)>();
2653 cursor.seek(&start_offset, Bias::Right, &());
2654 if cursor.item().is_none() {
2655 cursor.prev(&());
2656 }
2657 if !bounds.contains(&cursor.start().0) {
2658 cursor.next(&());
2659 }
2660
2661 let mut prev_buffer_id = cursor.prev_item().map(|excerpt| excerpt.buffer_id);
2662 std::iter::from_fn(move || {
2663 if self.singleton {
2664 None
2665 } else if bounds.contains(&cursor.start().0) {
2666 let excerpt = cursor.item()?;
2667 let starts_new_buffer = Some(excerpt.buffer_id) != prev_buffer_id;
2668 let boundary = ExcerptBoundary {
2669 id: excerpt.id.clone(),
2670 row: cursor.start().1.row,
2671 buffer: excerpt.buffer.clone(),
2672 range: excerpt.range.clone(),
2673 starts_new_buffer,
2674 };
2675
2676 prev_buffer_id = Some(excerpt.buffer_id);
2677 cursor.next(&());
2678 Some(boundary)
2679 } else {
2680 None
2681 }
2682 })
2683 }
2684
2685 pub fn edit_count(&self) -> usize {
2686 self.edit_count
2687 }
2688
2689 pub fn parse_count(&self) -> usize {
2690 self.parse_count
2691 }
2692
2693 /// Returns the smallest enclosing bracket ranges containing the given range or
2694 /// None if no brackets contain range or the range is not contained in a single
2695 /// excerpt
2696 pub fn innermost_enclosing_bracket_ranges<T: ToOffset>(
2697 &self,
2698 range: Range<T>,
2699 ) -> Option<(Range<usize>, Range<usize>)> {
2700 let range = range.start.to_offset(self)..range.end.to_offset(self);
2701
2702 // Get the ranges of the innermost pair of brackets.
2703 let mut result: Option<(Range<usize>, Range<usize>)> = None;
2704
2705 let Some(enclosing_bracket_ranges) = self.enclosing_bracket_ranges(range.clone()) else { return None; };
2706
2707 for (open, close) in enclosing_bracket_ranges {
2708 let len = close.end - open.start;
2709
2710 if let Some((existing_open, existing_close)) = &result {
2711 let existing_len = existing_close.end - existing_open.start;
2712 if len > existing_len {
2713 continue;
2714 }
2715 }
2716
2717 result = Some((open, close));
2718 }
2719
2720 result
2721 }
2722
2723 /// Returns enclosing bracket ranges containing the given range or returns None if the range is
2724 /// not contained in a single excerpt
2725 pub fn enclosing_bracket_ranges<'a, T: ToOffset>(
2726 &'a self,
2727 range: Range<T>,
2728 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + 'a> {
2729 let range = range.start.to_offset(self)..range.end.to_offset(self);
2730
2731 self.bracket_ranges(range.clone()).map(|range_pairs| {
2732 range_pairs
2733 .filter(move |(open, close)| open.start <= range.start && close.end >= range.end)
2734 })
2735 }
2736
2737 /// Returns bracket range pairs overlapping the given `range` or returns None if the `range` is
2738 /// not contained in a single excerpt
2739 pub fn bracket_ranges<'a, T: ToOffset>(
2740 &'a self,
2741 range: Range<T>,
2742 ) -> Option<impl Iterator<Item = (Range<usize>, Range<usize>)> + 'a> {
2743 let range = range.start.to_offset(self)..range.end.to_offset(self);
2744 let excerpt = self.excerpt_containing(range.clone());
2745 excerpt.map(|(excerpt, excerpt_offset)| {
2746 let excerpt_buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
2747 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
2748
2749 let start_in_buffer = excerpt_buffer_start + range.start.saturating_sub(excerpt_offset);
2750 let end_in_buffer = excerpt_buffer_start + range.end.saturating_sub(excerpt_offset);
2751
2752 excerpt
2753 .buffer
2754 .bracket_ranges(start_in_buffer..end_in_buffer)
2755 .filter_map(move |(start_bracket_range, end_bracket_range)| {
2756 if start_bracket_range.start < excerpt_buffer_start
2757 || end_bracket_range.end > excerpt_buffer_end
2758 {
2759 return None;
2760 }
2761
2762 let mut start_bracket_range = start_bracket_range.clone();
2763 start_bracket_range.start =
2764 excerpt_offset + (start_bracket_range.start - excerpt_buffer_start);
2765 start_bracket_range.end =
2766 excerpt_offset + (start_bracket_range.end - excerpt_buffer_start);
2767
2768 let mut end_bracket_range = end_bracket_range.clone();
2769 end_bracket_range.start =
2770 excerpt_offset + (end_bracket_range.start - excerpt_buffer_start);
2771 end_bracket_range.end =
2772 excerpt_offset + (end_bracket_range.end - excerpt_buffer_start);
2773 Some((start_bracket_range, end_bracket_range))
2774 })
2775 })
2776 }
2777
2778 pub fn diagnostics_update_count(&self) -> usize {
2779 self.diagnostics_update_count
2780 }
2781
2782 pub fn git_diff_update_count(&self) -> usize {
2783 self.git_diff_update_count
2784 }
2785
2786 pub fn trailing_excerpt_update_count(&self) -> usize {
2787 self.trailing_excerpt_update_count
2788 }
2789
2790 pub fn file_at<'a, T: ToOffset>(&'a self, point: T) -> Option<&'a Arc<dyn File>> {
2791 self.point_to_buffer_offset(point)
2792 .and_then(|(buffer, _)| buffer.file())
2793 }
2794
2795 pub fn language_at<'a, T: ToOffset>(&'a self, point: T) -> Option<&'a Arc<Language>> {
2796 self.point_to_buffer_offset(point)
2797 .and_then(|(buffer, offset)| buffer.language_at(offset))
2798 }
2799
2800 pub fn settings_at<'a, T: ToOffset>(
2801 &'a self,
2802 point: T,
2803 cx: &'a AppContext,
2804 ) -> &'a LanguageSettings {
2805 let mut language = None;
2806 let mut file = None;
2807 if let Some((buffer, offset)) = self.point_to_buffer_offset(point) {
2808 language = buffer.language_at(offset);
2809 file = buffer.file();
2810 }
2811 language_settings(language, file, cx)
2812 }
2813
2814 pub fn language_scope_at<'a, T: ToOffset>(&'a self, point: T) -> Option<LanguageScope> {
2815 self.point_to_buffer_offset(point)
2816 .and_then(|(buffer, offset)| buffer.language_scope_at(offset))
2817 }
2818
2819 pub fn language_indent_size_at<T: ToOffset>(
2820 &self,
2821 position: T,
2822 cx: &AppContext,
2823 ) -> Option<IndentSize> {
2824 let (buffer_snapshot, offset) = self.point_to_buffer_offset(position)?;
2825 Some(buffer_snapshot.language_indent_size_at(offset, cx))
2826 }
2827
2828 pub fn is_dirty(&self) -> bool {
2829 self.is_dirty
2830 }
2831
2832 pub fn has_conflict(&self) -> bool {
2833 self.has_conflict
2834 }
2835
2836 pub fn diagnostic_group<'a, O>(
2837 &'a self,
2838 group_id: usize,
2839 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
2840 where
2841 O: text::FromAnchor + 'a,
2842 {
2843 self.as_singleton()
2844 .into_iter()
2845 .flat_map(move |(_, _, buffer)| buffer.diagnostic_group(group_id))
2846 }
2847
2848 pub fn diagnostics_in_range<'a, T, O>(
2849 &'a self,
2850 range: Range<T>,
2851 reversed: bool,
2852 ) -> impl Iterator<Item = DiagnosticEntry<O>> + 'a
2853 where
2854 T: 'a + ToOffset,
2855 O: 'a + text::FromAnchor + Ord,
2856 {
2857 self.as_singleton()
2858 .into_iter()
2859 .flat_map(move |(_, _, buffer)| {
2860 buffer.diagnostics_in_range(
2861 range.start.to_offset(self)..range.end.to_offset(self),
2862 reversed,
2863 )
2864 })
2865 }
2866
2867 pub fn has_git_diffs(&self) -> bool {
2868 for excerpt in self.excerpts.iter() {
2869 if !excerpt.buffer.git_diff.is_empty() {
2870 return true;
2871 }
2872 }
2873 false
2874 }
2875
2876 pub fn git_diff_hunks_in_range_rev<'a>(
2877 &'a self,
2878 row_range: Range<u32>,
2879 ) -> impl 'a + Iterator<Item = DiffHunk<u32>> {
2880 let mut cursor = self.excerpts.cursor::<Point>();
2881
2882 cursor.seek(&Point::new(row_range.end, 0), Bias::Left, &());
2883 if cursor.item().is_none() {
2884 cursor.prev(&());
2885 }
2886
2887 std::iter::from_fn(move || {
2888 let excerpt = cursor.item()?;
2889 let multibuffer_start = *cursor.start();
2890 let multibuffer_end = multibuffer_start + excerpt.text_summary.lines;
2891 if multibuffer_start.row >= row_range.end {
2892 return None;
2893 }
2894
2895 let mut buffer_start = excerpt.range.context.start;
2896 let mut buffer_end = excerpt.range.context.end;
2897 let excerpt_start_point = buffer_start.to_point(&excerpt.buffer);
2898 let excerpt_end_point = excerpt_start_point + excerpt.text_summary.lines;
2899
2900 if row_range.start > multibuffer_start.row {
2901 let buffer_start_point =
2902 excerpt_start_point + Point::new(row_range.start - multibuffer_start.row, 0);
2903 buffer_start = excerpt.buffer.anchor_before(buffer_start_point);
2904 }
2905
2906 if row_range.end < multibuffer_end.row {
2907 let buffer_end_point =
2908 excerpt_start_point + Point::new(row_range.end - multibuffer_start.row, 0);
2909 buffer_end = excerpt.buffer.anchor_before(buffer_end_point);
2910 }
2911
2912 let buffer_hunks = excerpt
2913 .buffer
2914 .git_diff_hunks_intersecting_range_rev(buffer_start..buffer_end)
2915 .filter_map(move |hunk| {
2916 let start = multibuffer_start.row
2917 + hunk
2918 .buffer_range
2919 .start
2920 .saturating_sub(excerpt_start_point.row);
2921 let end = multibuffer_start.row
2922 + hunk
2923 .buffer_range
2924 .end
2925 .min(excerpt_end_point.row + 1)
2926 .saturating_sub(excerpt_start_point.row);
2927
2928 Some(DiffHunk {
2929 buffer_range: start..end,
2930 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
2931 })
2932 });
2933
2934 cursor.prev(&());
2935
2936 Some(buffer_hunks)
2937 })
2938 .flatten()
2939 }
2940
2941 pub fn git_diff_hunks_in_range<'a>(
2942 &'a self,
2943 row_range: Range<u32>,
2944 ) -> impl 'a + Iterator<Item = DiffHunk<u32>> {
2945 let mut cursor = self.excerpts.cursor::<Point>();
2946
2947 cursor.seek(&Point::new(row_range.start, 0), Bias::Right, &());
2948
2949 std::iter::from_fn(move || {
2950 let excerpt = cursor.item()?;
2951 let multibuffer_start = *cursor.start();
2952 let multibuffer_end = multibuffer_start + excerpt.text_summary.lines;
2953 if multibuffer_start.row >= row_range.end {
2954 return None;
2955 }
2956
2957 let mut buffer_start = excerpt.range.context.start;
2958 let mut buffer_end = excerpt.range.context.end;
2959 let excerpt_start_point = buffer_start.to_point(&excerpt.buffer);
2960 let excerpt_end_point = excerpt_start_point + excerpt.text_summary.lines;
2961
2962 if row_range.start > multibuffer_start.row {
2963 let buffer_start_point =
2964 excerpt_start_point + Point::new(row_range.start - multibuffer_start.row, 0);
2965 buffer_start = excerpt.buffer.anchor_before(buffer_start_point);
2966 }
2967
2968 if row_range.end < multibuffer_end.row {
2969 let buffer_end_point =
2970 excerpt_start_point + Point::new(row_range.end - multibuffer_start.row, 0);
2971 buffer_end = excerpt.buffer.anchor_before(buffer_end_point);
2972 }
2973
2974 let buffer_hunks = excerpt
2975 .buffer
2976 .git_diff_hunks_intersecting_range(buffer_start..buffer_end)
2977 .filter_map(move |hunk| {
2978 let start = multibuffer_start.row
2979 + hunk
2980 .buffer_range
2981 .start
2982 .saturating_sub(excerpt_start_point.row);
2983 let end = multibuffer_start.row
2984 + hunk
2985 .buffer_range
2986 .end
2987 .min(excerpt_end_point.row + 1)
2988 .saturating_sub(excerpt_start_point.row);
2989
2990 Some(DiffHunk {
2991 buffer_range: start..end,
2992 diff_base_byte_range: hunk.diff_base_byte_range.clone(),
2993 })
2994 });
2995
2996 cursor.next(&());
2997
2998 Some(buffer_hunks)
2999 })
3000 .flatten()
3001 }
3002
3003 pub fn range_for_syntax_ancestor<T: ToOffset>(&self, range: Range<T>) -> Option<Range<usize>> {
3004 let range = range.start.to_offset(self)..range.end.to_offset(self);
3005
3006 self.excerpt_containing(range.clone())
3007 .and_then(|(excerpt, excerpt_offset)| {
3008 let excerpt_buffer_start = excerpt.range.context.start.to_offset(&excerpt.buffer);
3009 let excerpt_buffer_end = excerpt_buffer_start + excerpt.text_summary.len;
3010
3011 let start_in_buffer =
3012 excerpt_buffer_start + range.start.saturating_sub(excerpt_offset);
3013 let end_in_buffer = excerpt_buffer_start + range.end.saturating_sub(excerpt_offset);
3014 let mut ancestor_buffer_range = excerpt
3015 .buffer
3016 .range_for_syntax_ancestor(start_in_buffer..end_in_buffer)?;
3017 ancestor_buffer_range.start =
3018 cmp::max(ancestor_buffer_range.start, excerpt_buffer_start);
3019 ancestor_buffer_range.end = cmp::min(ancestor_buffer_range.end, excerpt_buffer_end);
3020
3021 let start = excerpt_offset + (ancestor_buffer_range.start - excerpt_buffer_start);
3022 let end = excerpt_offset + (ancestor_buffer_range.end - excerpt_buffer_start);
3023 Some(start..end)
3024 })
3025 }
3026
3027 pub fn outline(&self, theme: Option<&SyntaxTheme>) -> Option<Outline<Anchor>> {
3028 let (excerpt_id, _, buffer) = self.as_singleton()?;
3029 let outline = buffer.outline(theme)?;
3030 Some(Outline::new(
3031 outline
3032 .items
3033 .into_iter()
3034 .map(|item| OutlineItem {
3035 depth: item.depth,
3036 range: self.anchor_in_excerpt(excerpt_id.clone(), item.range.start)
3037 ..self.anchor_in_excerpt(excerpt_id.clone(), item.range.end),
3038 text: item.text,
3039 highlight_ranges: item.highlight_ranges,
3040 name_ranges: item.name_ranges,
3041 })
3042 .collect(),
3043 ))
3044 }
3045
3046 pub fn symbols_containing<T: ToOffset>(
3047 &self,
3048 offset: T,
3049 theme: Option<&SyntaxTheme>,
3050 ) -> Option<(u64, Vec<OutlineItem<Anchor>>)> {
3051 let anchor = self.anchor_before(offset);
3052 let excerpt_id = anchor.excerpt_id();
3053 let excerpt = self.excerpt(excerpt_id)?;
3054 Some((
3055 excerpt.buffer_id,
3056 excerpt
3057 .buffer
3058 .symbols_containing(anchor.text_anchor, theme)
3059 .into_iter()
3060 .flatten()
3061 .map(|item| OutlineItem {
3062 depth: item.depth,
3063 range: self.anchor_in_excerpt(excerpt_id, item.range.start)
3064 ..self.anchor_in_excerpt(excerpt_id, item.range.end),
3065 text: item.text,
3066 highlight_ranges: item.highlight_ranges,
3067 name_ranges: item.name_ranges,
3068 })
3069 .collect(),
3070 ))
3071 }
3072
3073 fn excerpt_locator_for_id<'a>(&'a self, id: ExcerptId) -> &'a Locator {
3074 if id == ExcerptId::min() {
3075 Locator::min_ref()
3076 } else if id == ExcerptId::max() {
3077 Locator::max_ref()
3078 } else {
3079 let mut cursor = self.excerpt_ids.cursor::<ExcerptId>();
3080 cursor.seek(&id, Bias::Left, &());
3081 if let Some(entry) = cursor.item() {
3082 if entry.id == id {
3083 return &entry.locator;
3084 }
3085 }
3086 panic!("invalid excerpt id {:?}", id)
3087 }
3088 }
3089
3090 pub fn buffer_id_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<u64> {
3091 Some(self.excerpt(excerpt_id)?.buffer_id)
3092 }
3093
3094 pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
3095 Some(&self.excerpt(excerpt_id)?.buffer)
3096 }
3097
3098 fn excerpt<'a>(&'a self, excerpt_id: ExcerptId) -> Option<&'a Excerpt> {
3099 let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
3100 let locator = self.excerpt_locator_for_id(excerpt_id);
3101 cursor.seek(&Some(locator), Bias::Left, &());
3102 if let Some(excerpt) = cursor.item() {
3103 if excerpt.id == excerpt_id {
3104 return Some(excerpt);
3105 }
3106 }
3107 None
3108 }
3109
3110 /// Returns the excerpt containing range and its offset start within the multibuffer or none if `range` spans multiple excerpts
3111 fn excerpt_containing<'a, T: ToOffset>(
3112 &'a self,
3113 range: Range<T>,
3114 ) -> Option<(&'a Excerpt, usize)> {
3115 let range = range.start.to_offset(self)..range.end.to_offset(self);
3116
3117 let mut cursor = self.excerpts.cursor::<usize>();
3118 cursor.seek(&range.start, Bias::Right, &());
3119 let start_excerpt = cursor.item();
3120
3121 if range.start == range.end {
3122 return start_excerpt.map(|excerpt| (excerpt, *cursor.start()));
3123 }
3124
3125 cursor.seek(&range.end, Bias::Right, &());
3126 let end_excerpt = cursor.item();
3127
3128 start_excerpt
3129 .zip(end_excerpt)
3130 .and_then(|(start_excerpt, end_excerpt)| {
3131 if start_excerpt.id != end_excerpt.id {
3132 return None;
3133 }
3134
3135 Some((start_excerpt, *cursor.start()))
3136 })
3137 }
3138
3139 pub fn remote_selections_in_range<'a>(
3140 &'a self,
3141 range: &'a Range<Anchor>,
3142 ) -> impl 'a + Iterator<Item = (ReplicaId, bool, CursorShape, Selection<Anchor>)> {
3143 let mut cursor = self.excerpts.cursor::<ExcerptSummary>();
3144 let start_locator = self.excerpt_locator_for_id(range.start.excerpt_id);
3145 let end_locator = self.excerpt_locator_for_id(range.end.excerpt_id);
3146 cursor.seek(start_locator, Bias::Left, &());
3147 cursor
3148 .take_while(move |excerpt| excerpt.locator <= *end_locator)
3149 .flat_map(move |excerpt| {
3150 let mut query_range = excerpt.range.context.start..excerpt.range.context.end;
3151 if excerpt.id == range.start.excerpt_id {
3152 query_range.start = range.start.text_anchor;
3153 }
3154 if excerpt.id == range.end.excerpt_id {
3155 query_range.end = range.end.text_anchor;
3156 }
3157
3158 excerpt
3159 .buffer
3160 .remote_selections_in_range(query_range)
3161 .flat_map(move |(replica_id, line_mode, cursor_shape, selections)| {
3162 selections.map(move |selection| {
3163 let mut start = Anchor {
3164 buffer_id: Some(excerpt.buffer_id),
3165 excerpt_id: excerpt.id.clone(),
3166 text_anchor: selection.start,
3167 };
3168 let mut end = Anchor {
3169 buffer_id: Some(excerpt.buffer_id),
3170 excerpt_id: excerpt.id.clone(),
3171 text_anchor: selection.end,
3172 };
3173 if range.start.cmp(&start, self).is_gt() {
3174 start = range.start.clone();
3175 }
3176 if range.end.cmp(&end, self).is_lt() {
3177 end = range.end.clone();
3178 }
3179
3180 (
3181 replica_id,
3182 line_mode,
3183 cursor_shape,
3184 Selection {
3185 id: selection.id,
3186 start,
3187 end,
3188 reversed: selection.reversed,
3189 goal: selection.goal,
3190 },
3191 )
3192 })
3193 })
3194 })
3195 }
3196}
3197
3198#[cfg(any(test, feature = "test-support"))]
3199impl MultiBufferSnapshot {
3200 pub fn random_byte_range(&self, start_offset: usize, rng: &mut impl rand::Rng) -> Range<usize> {
3201 let end = self.clip_offset(rng.gen_range(start_offset..=self.len()), Bias::Right);
3202 let start = self.clip_offset(rng.gen_range(start_offset..=end), Bias::Right);
3203 start..end
3204 }
3205}
3206
3207impl History {
3208 fn start_transaction(&mut self, now: Instant) -> Option<TransactionId> {
3209 self.transaction_depth += 1;
3210 if self.transaction_depth == 1 {
3211 let id = self.next_transaction_id.tick();
3212 self.undo_stack.push(Transaction {
3213 id,
3214 buffer_transactions: Default::default(),
3215 first_edit_at: now,
3216 last_edit_at: now,
3217 suppress_grouping: false,
3218 });
3219 Some(id)
3220 } else {
3221 None
3222 }
3223 }
3224
3225 fn end_transaction(
3226 &mut self,
3227 now: Instant,
3228 buffer_transactions: HashMap<u64, TransactionId>,
3229 ) -> bool {
3230 assert_ne!(self.transaction_depth, 0);
3231 self.transaction_depth -= 1;
3232 if self.transaction_depth == 0 {
3233 if buffer_transactions.is_empty() {
3234 self.undo_stack.pop();
3235 false
3236 } else {
3237 self.redo_stack.clear();
3238 let transaction = self.undo_stack.last_mut().unwrap();
3239 transaction.last_edit_at = now;
3240 for (buffer_id, transaction_id) in buffer_transactions {
3241 transaction
3242 .buffer_transactions
3243 .entry(buffer_id)
3244 .or_insert(transaction_id);
3245 }
3246 true
3247 }
3248 } else {
3249 false
3250 }
3251 }
3252
3253 fn push_transaction<'a, T>(
3254 &mut self,
3255 buffer_transactions: T,
3256 now: Instant,
3257 cx: &mut ModelContext<MultiBuffer>,
3258 ) where
3259 T: IntoIterator<Item = (&'a ModelHandle<Buffer>, &'a language::Transaction)>,
3260 {
3261 assert_eq!(self.transaction_depth, 0);
3262 let transaction = Transaction {
3263 id: self.next_transaction_id.tick(),
3264 buffer_transactions: buffer_transactions
3265 .into_iter()
3266 .map(|(buffer, transaction)| (buffer.read(cx).remote_id(), transaction.id))
3267 .collect(),
3268 first_edit_at: now,
3269 last_edit_at: now,
3270 suppress_grouping: false,
3271 };
3272 if !transaction.buffer_transactions.is_empty() {
3273 self.undo_stack.push(transaction);
3274 self.redo_stack.clear();
3275 }
3276 }
3277
3278 fn finalize_last_transaction(&mut self) {
3279 if let Some(transaction) = self.undo_stack.last_mut() {
3280 transaction.suppress_grouping = true;
3281 }
3282 }
3283
3284 fn pop_undo(&mut self) -> Option<&mut Transaction> {
3285 assert_eq!(self.transaction_depth, 0);
3286 if let Some(transaction) = self.undo_stack.pop() {
3287 self.redo_stack.push(transaction);
3288 self.redo_stack.last_mut()
3289 } else {
3290 None
3291 }
3292 }
3293
3294 fn pop_redo(&mut self) -> Option<&mut Transaction> {
3295 assert_eq!(self.transaction_depth, 0);
3296 if let Some(transaction) = self.redo_stack.pop() {
3297 self.undo_stack.push(transaction);
3298 self.undo_stack.last_mut()
3299 } else {
3300 None
3301 }
3302 }
3303
3304 fn group(&mut self) -> Option<TransactionId> {
3305 let mut count = 0;
3306 let mut transactions = self.undo_stack.iter();
3307 if let Some(mut transaction) = transactions.next_back() {
3308 while let Some(prev_transaction) = transactions.next_back() {
3309 if !prev_transaction.suppress_grouping
3310 && transaction.first_edit_at - prev_transaction.last_edit_at
3311 <= self.group_interval
3312 {
3313 transaction = prev_transaction;
3314 count += 1;
3315 } else {
3316 break;
3317 }
3318 }
3319 }
3320 self.group_trailing(count)
3321 }
3322
3323 fn group_until(&mut self, transaction_id: TransactionId) {
3324 let mut count = 0;
3325 for transaction in self.undo_stack.iter().rev() {
3326 if transaction.id == transaction_id {
3327 self.group_trailing(count);
3328 break;
3329 } else if transaction.suppress_grouping {
3330 break;
3331 } else {
3332 count += 1;
3333 }
3334 }
3335 }
3336
3337 fn group_trailing(&mut self, n: usize) -> Option<TransactionId> {
3338 let new_len = self.undo_stack.len() - n;
3339 let (transactions_to_keep, transactions_to_merge) = self.undo_stack.split_at_mut(new_len);
3340 if let Some(last_transaction) = transactions_to_keep.last_mut() {
3341 if let Some(transaction) = transactions_to_merge.last() {
3342 last_transaction.last_edit_at = transaction.last_edit_at;
3343 }
3344 for to_merge in transactions_to_merge {
3345 for (buffer_id, transaction_id) in &to_merge.buffer_transactions {
3346 last_transaction
3347 .buffer_transactions
3348 .entry(*buffer_id)
3349 .or_insert(*transaction_id);
3350 }
3351 }
3352 }
3353
3354 self.undo_stack.truncate(new_len);
3355 self.undo_stack.last().map(|t| t.id)
3356 }
3357}
3358
3359impl Excerpt {
3360 fn new(
3361 id: ExcerptId,
3362 locator: Locator,
3363 buffer_id: u64,
3364 buffer: BufferSnapshot,
3365 range: ExcerptRange<text::Anchor>,
3366 has_trailing_newline: bool,
3367 ) -> Self {
3368 Excerpt {
3369 id,
3370 locator,
3371 max_buffer_row: range.context.end.to_point(&buffer).row,
3372 text_summary: buffer
3373 .text_summary_for_range::<TextSummary, _>(range.context.to_offset(&buffer)),
3374 buffer_id,
3375 buffer,
3376 range,
3377 has_trailing_newline,
3378 }
3379 }
3380
3381 fn chunks_in_range(&self, range: Range<usize>, language_aware: bool) -> ExcerptChunks {
3382 let content_start = self.range.context.start.to_offset(&self.buffer);
3383 let chunks_start = content_start + range.start;
3384 let chunks_end = content_start + cmp::min(range.end, self.text_summary.len);
3385
3386 let footer_height = if self.has_trailing_newline
3387 && range.start <= self.text_summary.len
3388 && range.end > self.text_summary.len
3389 {
3390 1
3391 } else {
3392 0
3393 };
3394
3395 let content_chunks = self.buffer.chunks(chunks_start..chunks_end, language_aware);
3396
3397 ExcerptChunks {
3398 content_chunks,
3399 footer_height,
3400 }
3401 }
3402
3403 fn bytes_in_range(&self, range: Range<usize>) -> ExcerptBytes {
3404 let content_start = self.range.context.start.to_offset(&self.buffer);
3405 let bytes_start = content_start + range.start;
3406 let bytes_end = content_start + cmp::min(range.end, self.text_summary.len);
3407 let footer_height = if self.has_trailing_newline
3408 && range.start <= self.text_summary.len
3409 && range.end > self.text_summary.len
3410 {
3411 1
3412 } else {
3413 0
3414 };
3415 let content_bytes = self.buffer.bytes_in_range(bytes_start..bytes_end);
3416
3417 ExcerptBytes {
3418 content_bytes,
3419 footer_height,
3420 }
3421 }
3422
3423 fn clip_anchor(&self, text_anchor: text::Anchor) -> text::Anchor {
3424 if text_anchor
3425 .cmp(&self.range.context.start, &self.buffer)
3426 .is_lt()
3427 {
3428 self.range.context.start
3429 } else if text_anchor
3430 .cmp(&self.range.context.end, &self.buffer)
3431 .is_gt()
3432 {
3433 self.range.context.end
3434 } else {
3435 text_anchor
3436 }
3437 }
3438
3439 fn contains(&self, anchor: &Anchor) -> bool {
3440 Some(self.buffer_id) == anchor.buffer_id
3441 && self
3442 .range
3443 .context
3444 .start
3445 .cmp(&anchor.text_anchor, &self.buffer)
3446 .is_le()
3447 && self
3448 .range
3449 .context
3450 .end
3451 .cmp(&anchor.text_anchor, &self.buffer)
3452 .is_ge()
3453 }
3454}
3455
3456impl ExcerptId {
3457 pub fn min() -> Self {
3458 Self(0)
3459 }
3460
3461 pub fn max() -> Self {
3462 Self(usize::MAX)
3463 }
3464
3465 pub fn to_proto(&self) -> u64 {
3466 self.0 as _
3467 }
3468
3469 pub fn from_proto(proto: u64) -> Self {
3470 Self(proto as _)
3471 }
3472
3473 pub fn cmp(&self, other: &Self, snapshot: &MultiBufferSnapshot) -> cmp::Ordering {
3474 let a = snapshot.excerpt_locator_for_id(*self);
3475 let b = snapshot.excerpt_locator_for_id(*other);
3476 a.cmp(&b).then_with(|| self.0.cmp(&other.0))
3477 }
3478}
3479
3480impl Into<usize> for ExcerptId {
3481 fn into(self) -> usize {
3482 self.0
3483 }
3484}
3485
3486impl fmt::Debug for Excerpt {
3487 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
3488 f.debug_struct("Excerpt")
3489 .field("id", &self.id)
3490 .field("locator", &self.locator)
3491 .field("buffer_id", &self.buffer_id)
3492 .field("range", &self.range)
3493 .field("text_summary", &self.text_summary)
3494 .field("has_trailing_newline", &self.has_trailing_newline)
3495 .finish()
3496 }
3497}
3498
3499impl sum_tree::Item for Excerpt {
3500 type Summary = ExcerptSummary;
3501
3502 fn summary(&self) -> Self::Summary {
3503 let mut text = self.text_summary.clone();
3504 if self.has_trailing_newline {
3505 text += TextSummary::from("\n");
3506 }
3507 ExcerptSummary {
3508 excerpt_id: self.id,
3509 excerpt_locator: self.locator.clone(),
3510 max_buffer_row: self.max_buffer_row,
3511 text,
3512 }
3513 }
3514}
3515
3516impl sum_tree::Item for ExcerptIdMapping {
3517 type Summary = ExcerptId;
3518
3519 fn summary(&self) -> Self::Summary {
3520 self.id
3521 }
3522}
3523
3524impl sum_tree::KeyedItem for ExcerptIdMapping {
3525 type Key = ExcerptId;
3526
3527 fn key(&self) -> Self::Key {
3528 self.id
3529 }
3530}
3531
3532impl sum_tree::Summary for ExcerptId {
3533 type Context = ();
3534
3535 fn add_summary(&mut self, other: &Self, _: &()) {
3536 *self = *other;
3537 }
3538}
3539
3540impl sum_tree::Summary for ExcerptSummary {
3541 type Context = ();
3542
3543 fn add_summary(&mut self, summary: &Self, _: &()) {
3544 debug_assert!(summary.excerpt_locator > self.excerpt_locator);
3545 self.excerpt_locator = summary.excerpt_locator.clone();
3546 self.text.add_summary(&summary.text, &());
3547 self.max_buffer_row = cmp::max(self.max_buffer_row, summary.max_buffer_row);
3548 }
3549}
3550
3551impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for TextSummary {
3552 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3553 *self += &summary.text;
3554 }
3555}
3556
3557impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for usize {
3558 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3559 *self += summary.text.len;
3560 }
3561}
3562
3563impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for usize {
3564 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
3565 Ord::cmp(self, &cursor_location.text.len)
3566 }
3567}
3568
3569impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, Option<&'a Locator>> for Locator {
3570 fn cmp(&self, cursor_location: &Option<&'a Locator>, _: &()) -> cmp::Ordering {
3571 Ord::cmp(&Some(self), cursor_location)
3572 }
3573}
3574
3575impl<'a> sum_tree::SeekTarget<'a, ExcerptSummary, ExcerptSummary> for Locator {
3576 fn cmp(&self, cursor_location: &ExcerptSummary, _: &()) -> cmp::Ordering {
3577 Ord::cmp(self, &cursor_location.excerpt_locator)
3578 }
3579}
3580
3581impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for OffsetUtf16 {
3582 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3583 *self += summary.text.len_utf16;
3584 }
3585}
3586
3587impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Point {
3588 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3589 *self += summary.text.lines;
3590 }
3591}
3592
3593impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for PointUtf16 {
3594 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3595 *self += summary.text.lines_utf16()
3596 }
3597}
3598
3599impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<&'a Locator> {
3600 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3601 *self = Some(&summary.excerpt_locator);
3602 }
3603}
3604
3605impl<'a> sum_tree::Dimension<'a, ExcerptSummary> for Option<ExcerptId> {
3606 fn add_summary(&mut self, summary: &'a ExcerptSummary, _: &()) {
3607 *self = Some(summary.excerpt_id);
3608 }
3609}
3610
3611impl<'a> MultiBufferRows<'a> {
3612 pub fn seek(&mut self, row: u32) {
3613 self.buffer_row_range = 0..0;
3614
3615 self.excerpts
3616 .seek_forward(&Point::new(row, 0), Bias::Right, &());
3617 if self.excerpts.item().is_none() {
3618 self.excerpts.prev(&());
3619
3620 if self.excerpts.item().is_none() && row == 0 {
3621 self.buffer_row_range = 0..1;
3622 return;
3623 }
3624 }
3625
3626 if let Some(excerpt) = self.excerpts.item() {
3627 let overshoot = row - self.excerpts.start().row;
3628 let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
3629 self.buffer_row_range.start = excerpt_start + overshoot;
3630 self.buffer_row_range.end = excerpt_start + excerpt.text_summary.lines.row + 1;
3631 }
3632 }
3633}
3634
3635impl<'a> Iterator for MultiBufferRows<'a> {
3636 type Item = Option<u32>;
3637
3638 fn next(&mut self) -> Option<Self::Item> {
3639 loop {
3640 if !self.buffer_row_range.is_empty() {
3641 let row = Some(self.buffer_row_range.start);
3642 self.buffer_row_range.start += 1;
3643 return Some(row);
3644 }
3645 self.excerpts.item()?;
3646 self.excerpts.next(&());
3647 let excerpt = self.excerpts.item()?;
3648 self.buffer_row_range.start = excerpt.range.context.start.to_point(&excerpt.buffer).row;
3649 self.buffer_row_range.end =
3650 self.buffer_row_range.start + excerpt.text_summary.lines.row + 1;
3651 }
3652 }
3653}
3654
3655impl<'a> MultiBufferChunks<'a> {
3656 pub fn offset(&self) -> usize {
3657 self.range.start
3658 }
3659
3660 pub fn seek(&mut self, offset: usize) {
3661 self.range.start = offset;
3662 self.excerpts.seek(&offset, Bias::Right, &());
3663 if let Some(excerpt) = self.excerpts.item() {
3664 self.excerpt_chunks = Some(excerpt.chunks_in_range(
3665 self.range.start - self.excerpts.start()..self.range.end - self.excerpts.start(),
3666 self.language_aware,
3667 ));
3668 } else {
3669 self.excerpt_chunks = None;
3670 }
3671 }
3672}
3673
3674impl<'a> Iterator for MultiBufferChunks<'a> {
3675 type Item = Chunk<'a>;
3676
3677 fn next(&mut self) -> Option<Self::Item> {
3678 if self.range.is_empty() {
3679 None
3680 } else if let Some(chunk) = self.excerpt_chunks.as_mut()?.next() {
3681 self.range.start += chunk.text.len();
3682 Some(chunk)
3683 } else {
3684 self.excerpts.next(&());
3685 let excerpt = self.excerpts.item()?;
3686 self.excerpt_chunks = Some(excerpt.chunks_in_range(
3687 0..self.range.end - self.excerpts.start(),
3688 self.language_aware,
3689 ));
3690 self.next()
3691 }
3692 }
3693}
3694
3695impl<'a> MultiBufferBytes<'a> {
3696 fn consume(&mut self, len: usize) {
3697 self.range.start += len;
3698 self.chunk = &self.chunk[len..];
3699
3700 if !self.range.is_empty() && self.chunk.is_empty() {
3701 if let Some(chunk) = self.excerpt_bytes.as_mut().and_then(|bytes| bytes.next()) {
3702 self.chunk = chunk;
3703 } else {
3704 self.excerpts.next(&());
3705 if let Some(excerpt) = self.excerpts.item() {
3706 let mut excerpt_bytes =
3707 excerpt.bytes_in_range(0..self.range.end - self.excerpts.start());
3708 self.chunk = excerpt_bytes.next().unwrap();
3709 self.excerpt_bytes = Some(excerpt_bytes);
3710 }
3711 }
3712 }
3713 }
3714}
3715
3716impl<'a> Iterator for MultiBufferBytes<'a> {
3717 type Item = &'a [u8];
3718
3719 fn next(&mut self) -> Option<Self::Item> {
3720 let chunk = self.chunk;
3721 if chunk.is_empty() {
3722 None
3723 } else {
3724 self.consume(chunk.len());
3725 Some(chunk)
3726 }
3727 }
3728}
3729
3730impl<'a> io::Read for MultiBufferBytes<'a> {
3731 fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
3732 let len = cmp::min(buf.len(), self.chunk.len());
3733 buf[..len].copy_from_slice(&self.chunk[..len]);
3734 if len > 0 {
3735 self.consume(len);
3736 }
3737 Ok(len)
3738 }
3739}
3740
3741impl<'a> Iterator for ExcerptBytes<'a> {
3742 type Item = &'a [u8];
3743
3744 fn next(&mut self) -> Option<Self::Item> {
3745 if let Some(chunk) = self.content_bytes.next() {
3746 if !chunk.is_empty() {
3747 return Some(chunk);
3748 }
3749 }
3750
3751 if self.footer_height > 0 {
3752 let result = &NEWLINES[..self.footer_height];
3753 self.footer_height = 0;
3754 return Some(result);
3755 }
3756
3757 None
3758 }
3759}
3760
3761impl<'a> Iterator for ExcerptChunks<'a> {
3762 type Item = Chunk<'a>;
3763
3764 fn next(&mut self) -> Option<Self::Item> {
3765 if let Some(chunk) = self.content_chunks.next() {
3766 return Some(chunk);
3767 }
3768
3769 if self.footer_height > 0 {
3770 let text = unsafe { str::from_utf8_unchecked(&NEWLINES[..self.footer_height]) };
3771 self.footer_height = 0;
3772 return Some(Chunk {
3773 text,
3774 ..Default::default()
3775 });
3776 }
3777
3778 None
3779 }
3780}
3781
3782impl ToOffset for Point {
3783 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3784 snapshot.point_to_offset(*self)
3785 }
3786}
3787
3788impl ToOffset for usize {
3789 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3790 assert!(*self <= snapshot.len(), "offset is out of range");
3791 *self
3792 }
3793}
3794
3795impl ToOffset for OffsetUtf16 {
3796 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3797 snapshot.offset_utf16_to_offset(*self)
3798 }
3799}
3800
3801impl ToOffset for PointUtf16 {
3802 fn to_offset<'a>(&self, snapshot: &MultiBufferSnapshot) -> usize {
3803 snapshot.point_utf16_to_offset(*self)
3804 }
3805}
3806
3807impl ToOffsetUtf16 for OffsetUtf16 {
3808 fn to_offset_utf16(&self, _snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
3809 *self
3810 }
3811}
3812
3813impl ToOffsetUtf16 for usize {
3814 fn to_offset_utf16(&self, snapshot: &MultiBufferSnapshot) -> OffsetUtf16 {
3815 snapshot.offset_to_offset_utf16(*self)
3816 }
3817}
3818
3819impl ToPoint for usize {
3820 fn to_point<'a>(&self, snapshot: &MultiBufferSnapshot) -> Point {
3821 snapshot.offset_to_point(*self)
3822 }
3823}
3824
3825impl ToPoint for Point {
3826 fn to_point<'a>(&self, _: &MultiBufferSnapshot) -> Point {
3827 *self
3828 }
3829}
3830
3831impl ToPointUtf16 for usize {
3832 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
3833 snapshot.offset_to_point_utf16(*self)
3834 }
3835}
3836
3837impl ToPointUtf16 for Point {
3838 fn to_point_utf16<'a>(&self, snapshot: &MultiBufferSnapshot) -> PointUtf16 {
3839 snapshot.point_to_point_utf16(*self)
3840 }
3841}
3842
3843impl ToPointUtf16 for PointUtf16 {
3844 fn to_point_utf16<'a>(&self, _: &MultiBufferSnapshot) -> PointUtf16 {
3845 *self
3846 }
3847}
3848
3849fn build_excerpt_ranges<T>(
3850 buffer: &BufferSnapshot,
3851 ranges: &[Range<T>],
3852 context_line_count: u32,
3853) -> (Vec<ExcerptRange<Point>>, Vec<usize>)
3854where
3855 T: text::ToPoint,
3856{
3857 let max_point = buffer.max_point();
3858 let mut range_counts = Vec::new();
3859 let mut excerpt_ranges = Vec::new();
3860 let mut range_iter = ranges
3861 .iter()
3862 .map(|range| range.start.to_point(buffer)..range.end.to_point(buffer))
3863 .peekable();
3864 while let Some(range) = range_iter.next() {
3865 let excerpt_start = Point::new(range.start.row.saturating_sub(context_line_count), 0);
3866 let mut excerpt_end = Point::new(range.end.row + 1 + context_line_count, 0).min(max_point);
3867 let mut ranges_in_excerpt = 1;
3868
3869 while let Some(next_range) = range_iter.peek() {
3870 if next_range.start.row <= excerpt_end.row + context_line_count {
3871 excerpt_end =
3872 Point::new(next_range.end.row + 1 + context_line_count, 0).min(max_point);
3873 ranges_in_excerpt += 1;
3874 range_iter.next();
3875 } else {
3876 break;
3877 }
3878 }
3879
3880 excerpt_ranges.push(ExcerptRange {
3881 context: excerpt_start..excerpt_end,
3882 primary: Some(range),
3883 });
3884 range_counts.push(ranges_in_excerpt);
3885 }
3886
3887 (excerpt_ranges, range_counts)
3888}
3889
3890#[cfg(test)]
3891mod tests {
3892 use crate::editor_tests::init_test;
3893
3894 use super::*;
3895 use futures::StreamExt;
3896 use gpui::{AppContext, TestAppContext};
3897 use language::{Buffer, Rope};
3898 use project::{FakeFs, Project};
3899 use rand::prelude::*;
3900 use settings::SettingsStore;
3901 use std::{env, rc::Rc};
3902 use unindent::Unindent;
3903 use util::test::sample_text;
3904
3905 #[gpui::test]
3906 fn test_singleton(cx: &mut AppContext) {
3907 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
3908 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
3909
3910 let snapshot = multibuffer.read(cx).snapshot(cx);
3911 assert_eq!(snapshot.text(), buffer.read(cx).text());
3912
3913 assert_eq!(
3914 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3915 (0..buffer.read(cx).row_count())
3916 .map(Some)
3917 .collect::<Vec<_>>()
3918 );
3919
3920 buffer.update(cx, |buffer, cx| buffer.edit([(1..3, "XXX\n")], None, cx));
3921 let snapshot = multibuffer.read(cx).snapshot(cx);
3922
3923 assert_eq!(snapshot.text(), buffer.read(cx).text());
3924 assert_eq!(
3925 snapshot.buffer_rows(0).collect::<Vec<_>>(),
3926 (0..buffer.read(cx).row_count())
3927 .map(Some)
3928 .collect::<Vec<_>>()
3929 );
3930 }
3931
3932 #[gpui::test]
3933 fn test_remote(cx: &mut AppContext) {
3934 let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
3935 let guest_buffer = cx.add_model(|cx| {
3936 let state = host_buffer.read(cx).to_proto();
3937 let ops = cx
3938 .background()
3939 .block(host_buffer.read(cx).serialize_ops(None, cx));
3940 let mut buffer = Buffer::from_proto(1, state, None).unwrap();
3941 buffer
3942 .apply_ops(
3943 ops.into_iter()
3944 .map(|op| language::proto::deserialize_operation(op).unwrap()),
3945 cx,
3946 )
3947 .unwrap();
3948 buffer
3949 });
3950 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(guest_buffer.clone(), cx));
3951 let snapshot = multibuffer.read(cx).snapshot(cx);
3952 assert_eq!(snapshot.text(), "a");
3953
3954 guest_buffer.update(cx, |buffer, cx| buffer.edit([(1..1, "b")], None, cx));
3955 let snapshot = multibuffer.read(cx).snapshot(cx);
3956 assert_eq!(snapshot.text(), "ab");
3957
3958 guest_buffer.update(cx, |buffer, cx| buffer.edit([(2..2, "c")], None, cx));
3959 let snapshot = multibuffer.read(cx).snapshot(cx);
3960 assert_eq!(snapshot.text(), "abc");
3961 }
3962
3963 #[gpui::test]
3964 fn test_excerpt_boundaries_and_clipping(cx: &mut AppContext) {
3965 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
3966 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
3967 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
3968
3969 let events = Rc::new(RefCell::new(Vec::<Event>::new()));
3970 multibuffer.update(cx, |_, cx| {
3971 let events = events.clone();
3972 cx.subscribe(&multibuffer, move |_, _, event, _| {
3973 if let Event::Edited = event {
3974 events.borrow_mut().push(event.clone())
3975 }
3976 })
3977 .detach();
3978 });
3979
3980 let subscription = multibuffer.update(cx, |multibuffer, cx| {
3981 let subscription = multibuffer.subscribe();
3982 multibuffer.push_excerpts(
3983 buffer_1.clone(),
3984 [ExcerptRange {
3985 context: Point::new(1, 2)..Point::new(2, 5),
3986 primary: None,
3987 }],
3988 cx,
3989 );
3990 assert_eq!(
3991 subscription.consume().into_inner(),
3992 [Edit {
3993 old: 0..0,
3994 new: 0..10
3995 }]
3996 );
3997
3998 multibuffer.push_excerpts(
3999 buffer_1.clone(),
4000 [ExcerptRange {
4001 context: Point::new(3, 3)..Point::new(4, 4),
4002 primary: None,
4003 }],
4004 cx,
4005 );
4006 multibuffer.push_excerpts(
4007 buffer_2.clone(),
4008 [ExcerptRange {
4009 context: Point::new(3, 1)..Point::new(3, 3),
4010 primary: None,
4011 }],
4012 cx,
4013 );
4014 assert_eq!(
4015 subscription.consume().into_inner(),
4016 [Edit {
4017 old: 10..10,
4018 new: 10..22
4019 }]
4020 );
4021
4022 subscription
4023 });
4024
4025 // Adding excerpts emits an edited event.
4026 assert_eq!(
4027 events.borrow().as_slice(),
4028 &[Event::Edited, Event::Edited, Event::Edited]
4029 );
4030
4031 let snapshot = multibuffer.read(cx).snapshot(cx);
4032 assert_eq!(
4033 snapshot.text(),
4034 concat!(
4035 "bbbb\n", // Preserve newlines
4036 "ccccc\n", //
4037 "ddd\n", //
4038 "eeee\n", //
4039 "jj" //
4040 )
4041 );
4042 assert_eq!(
4043 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4044 [Some(1), Some(2), Some(3), Some(4), Some(3)]
4045 );
4046 assert_eq!(
4047 snapshot.buffer_rows(2).collect::<Vec<_>>(),
4048 [Some(3), Some(4), Some(3)]
4049 );
4050 assert_eq!(snapshot.buffer_rows(4).collect::<Vec<_>>(), [Some(3)]);
4051 assert_eq!(snapshot.buffer_rows(5).collect::<Vec<_>>(), []);
4052
4053 assert_eq!(
4054 boundaries_in_range(Point::new(0, 0)..Point::new(4, 2), &snapshot),
4055 &[
4056 (0, "bbbb\nccccc".to_string(), true),
4057 (2, "ddd\neeee".to_string(), false),
4058 (4, "jj".to_string(), true),
4059 ]
4060 );
4061 assert_eq!(
4062 boundaries_in_range(Point::new(0, 0)..Point::new(2, 0), &snapshot),
4063 &[(0, "bbbb\nccccc".to_string(), true)]
4064 );
4065 assert_eq!(
4066 boundaries_in_range(Point::new(1, 0)..Point::new(1, 5), &snapshot),
4067 &[]
4068 );
4069 assert_eq!(
4070 boundaries_in_range(Point::new(1, 0)..Point::new(2, 0), &snapshot),
4071 &[]
4072 );
4073 assert_eq!(
4074 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
4075 &[(2, "ddd\neeee".to_string(), false)]
4076 );
4077 assert_eq!(
4078 boundaries_in_range(Point::new(1, 0)..Point::new(4, 0), &snapshot),
4079 &[(2, "ddd\neeee".to_string(), false)]
4080 );
4081 assert_eq!(
4082 boundaries_in_range(Point::new(2, 0)..Point::new(3, 0), &snapshot),
4083 &[(2, "ddd\neeee".to_string(), false)]
4084 );
4085 assert_eq!(
4086 boundaries_in_range(Point::new(4, 0)..Point::new(4, 2), &snapshot),
4087 &[(4, "jj".to_string(), true)]
4088 );
4089 assert_eq!(
4090 boundaries_in_range(Point::new(4, 2)..Point::new(4, 2), &snapshot),
4091 &[]
4092 );
4093
4094 buffer_1.update(cx, |buffer, cx| {
4095 let text = "\n";
4096 buffer.edit(
4097 [
4098 (Point::new(0, 0)..Point::new(0, 0), text),
4099 (Point::new(2, 1)..Point::new(2, 3), text),
4100 ],
4101 None,
4102 cx,
4103 );
4104 });
4105
4106 let snapshot = multibuffer.read(cx).snapshot(cx);
4107 assert_eq!(
4108 snapshot.text(),
4109 concat!(
4110 "bbbb\n", // Preserve newlines
4111 "c\n", //
4112 "cc\n", //
4113 "ddd\n", //
4114 "eeee\n", //
4115 "jj" //
4116 )
4117 );
4118
4119 assert_eq!(
4120 subscription.consume().into_inner(),
4121 [Edit {
4122 old: 6..8,
4123 new: 6..7
4124 }]
4125 );
4126
4127 let snapshot = multibuffer.read(cx).snapshot(cx);
4128 assert_eq!(
4129 snapshot.clip_point(Point::new(0, 5), Bias::Left),
4130 Point::new(0, 4)
4131 );
4132 assert_eq!(
4133 snapshot.clip_point(Point::new(0, 5), Bias::Right),
4134 Point::new(0, 4)
4135 );
4136 assert_eq!(
4137 snapshot.clip_point(Point::new(5, 1), Bias::Right),
4138 Point::new(5, 1)
4139 );
4140 assert_eq!(
4141 snapshot.clip_point(Point::new(5, 2), Bias::Right),
4142 Point::new(5, 2)
4143 );
4144 assert_eq!(
4145 snapshot.clip_point(Point::new(5, 3), Bias::Right),
4146 Point::new(5, 2)
4147 );
4148
4149 let snapshot = multibuffer.update(cx, |multibuffer, cx| {
4150 let (buffer_2_excerpt_id, _) =
4151 multibuffer.excerpts_for_buffer(&buffer_2, cx)[0].clone();
4152 multibuffer.remove_excerpts([buffer_2_excerpt_id], cx);
4153 multibuffer.snapshot(cx)
4154 });
4155
4156 assert_eq!(
4157 snapshot.text(),
4158 concat!(
4159 "bbbb\n", // Preserve newlines
4160 "c\n", //
4161 "cc\n", //
4162 "ddd\n", //
4163 "eeee", //
4164 )
4165 );
4166
4167 fn boundaries_in_range(
4168 range: Range<Point>,
4169 snapshot: &MultiBufferSnapshot,
4170 ) -> Vec<(u32, String, bool)> {
4171 snapshot
4172 .excerpt_boundaries_in_range(range)
4173 .map(|boundary| {
4174 (
4175 boundary.row,
4176 boundary
4177 .buffer
4178 .text_for_range(boundary.range.context)
4179 .collect::<String>(),
4180 boundary.starts_new_buffer,
4181 )
4182 })
4183 .collect::<Vec<_>>()
4184 }
4185 }
4186
4187 #[gpui::test]
4188 fn test_excerpt_events(cx: &mut AppContext) {
4189 let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(10, 3, 'a'), cx));
4190 let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(10, 3, 'm'), cx));
4191
4192 let leader_multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4193 let follower_multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4194 let follower_edit_event_count = Rc::new(RefCell::new(0));
4195
4196 follower_multibuffer.update(cx, |_, cx| {
4197 let follower_edit_event_count = follower_edit_event_count.clone();
4198 cx.subscribe(
4199 &leader_multibuffer,
4200 move |follower, _, event, cx| match event.clone() {
4201 Event::ExcerptsAdded {
4202 buffer,
4203 predecessor,
4204 excerpts,
4205 } => follower.insert_excerpts_with_ids_after(predecessor, buffer, excerpts, cx),
4206 Event::ExcerptsRemoved { ids } => follower.remove_excerpts(ids, cx),
4207 Event::Edited => {
4208 *follower_edit_event_count.borrow_mut() += 1;
4209 }
4210 _ => {}
4211 },
4212 )
4213 .detach();
4214 });
4215
4216 leader_multibuffer.update(cx, |leader, cx| {
4217 leader.push_excerpts(
4218 buffer_1.clone(),
4219 [
4220 ExcerptRange {
4221 context: 0..8,
4222 primary: None,
4223 },
4224 ExcerptRange {
4225 context: 12..16,
4226 primary: None,
4227 },
4228 ],
4229 cx,
4230 );
4231 leader.insert_excerpts_after(
4232 leader.excerpt_ids()[0],
4233 buffer_2.clone(),
4234 [
4235 ExcerptRange {
4236 context: 0..5,
4237 primary: None,
4238 },
4239 ExcerptRange {
4240 context: 10..15,
4241 primary: None,
4242 },
4243 ],
4244 cx,
4245 )
4246 });
4247 assert_eq!(
4248 leader_multibuffer.read(cx).snapshot(cx).text(),
4249 follower_multibuffer.read(cx).snapshot(cx).text(),
4250 );
4251 assert_eq!(*follower_edit_event_count.borrow(), 2);
4252
4253 leader_multibuffer.update(cx, |leader, cx| {
4254 let excerpt_ids = leader.excerpt_ids();
4255 leader.remove_excerpts([excerpt_ids[1], excerpt_ids[3]], cx);
4256 });
4257 assert_eq!(
4258 leader_multibuffer.read(cx).snapshot(cx).text(),
4259 follower_multibuffer.read(cx).snapshot(cx).text(),
4260 );
4261 assert_eq!(*follower_edit_event_count.borrow(), 3);
4262
4263 // Removing an empty set of excerpts is a noop.
4264 leader_multibuffer.update(cx, |leader, cx| {
4265 leader.remove_excerpts([], cx);
4266 });
4267 assert_eq!(
4268 leader_multibuffer.read(cx).snapshot(cx).text(),
4269 follower_multibuffer.read(cx).snapshot(cx).text(),
4270 );
4271 assert_eq!(*follower_edit_event_count.borrow(), 3);
4272
4273 // Adding an empty set of excerpts is a noop.
4274 leader_multibuffer.update(cx, |leader, cx| {
4275 leader.push_excerpts::<usize>(buffer_2.clone(), [], cx);
4276 });
4277 assert_eq!(
4278 leader_multibuffer.read(cx).snapshot(cx).text(),
4279 follower_multibuffer.read(cx).snapshot(cx).text(),
4280 );
4281 assert_eq!(*follower_edit_event_count.borrow(), 3);
4282
4283 leader_multibuffer.update(cx, |leader, cx| {
4284 leader.clear(cx);
4285 });
4286 assert_eq!(
4287 leader_multibuffer.read(cx).snapshot(cx).text(),
4288 follower_multibuffer.read(cx).snapshot(cx).text(),
4289 );
4290 assert_eq!(*follower_edit_event_count.borrow(), 4);
4291 }
4292
4293 #[gpui::test]
4294 fn test_push_excerpts_with_context_lines(cx: &mut AppContext) {
4295 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(20, 3, 'a'), cx));
4296 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4297 let anchor_ranges = multibuffer.update(cx, |multibuffer, cx| {
4298 multibuffer.push_excerpts_with_context_lines(
4299 buffer.clone(),
4300 vec![
4301 Point::new(3, 2)..Point::new(4, 2),
4302 Point::new(7, 1)..Point::new(7, 3),
4303 Point::new(15, 0)..Point::new(15, 0),
4304 ],
4305 2,
4306 cx,
4307 )
4308 });
4309
4310 let snapshot = multibuffer.read(cx).snapshot(cx);
4311 assert_eq!(
4312 snapshot.text(),
4313 "bbb\nccc\nddd\neee\nfff\nggg\nhhh\niii\njjj\n\nnnn\nooo\nppp\nqqq\nrrr\n"
4314 );
4315
4316 assert_eq!(
4317 anchor_ranges
4318 .iter()
4319 .map(|range| range.to_point(&snapshot))
4320 .collect::<Vec<_>>(),
4321 vec![
4322 Point::new(2, 2)..Point::new(3, 2),
4323 Point::new(6, 1)..Point::new(6, 3),
4324 Point::new(12, 0)..Point::new(12, 0)
4325 ]
4326 );
4327 }
4328
4329 #[gpui::test]
4330 async fn test_stream_excerpts_with_context_lines(cx: &mut TestAppContext) {
4331 let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(20, 3, 'a'), cx));
4332 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4333 let (task, anchor_ranges) = multibuffer.update(cx, |multibuffer, cx| {
4334 let snapshot = buffer.read(cx);
4335 let ranges = vec![
4336 snapshot.anchor_before(Point::new(3, 2))..snapshot.anchor_before(Point::new(4, 2)),
4337 snapshot.anchor_before(Point::new(7, 1))..snapshot.anchor_before(Point::new(7, 3)),
4338 snapshot.anchor_before(Point::new(15, 0))
4339 ..snapshot.anchor_before(Point::new(15, 0)),
4340 ];
4341 multibuffer.stream_excerpts_with_context_lines(vec![(buffer.clone(), ranges)], 2, cx)
4342 });
4343
4344 let anchor_ranges = anchor_ranges.collect::<Vec<_>>().await;
4345 // Ensure task is finished when stream completes.
4346 task.await;
4347
4348 let snapshot = multibuffer.read_with(cx, |multibuffer, cx| multibuffer.snapshot(cx));
4349 assert_eq!(
4350 snapshot.text(),
4351 "bbb\nccc\nddd\neee\nfff\nggg\nhhh\niii\njjj\n\nnnn\nooo\nppp\nqqq\nrrr\n"
4352 );
4353
4354 assert_eq!(
4355 anchor_ranges
4356 .iter()
4357 .map(|range| range.to_point(&snapshot))
4358 .collect::<Vec<_>>(),
4359 vec![
4360 Point::new(2, 2)..Point::new(3, 2),
4361 Point::new(6, 1)..Point::new(6, 3),
4362 Point::new(12, 0)..Point::new(12, 0)
4363 ]
4364 );
4365 }
4366
4367 #[gpui::test]
4368 fn test_empty_multibuffer(cx: &mut AppContext) {
4369 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4370
4371 let snapshot = multibuffer.read(cx).snapshot(cx);
4372 assert_eq!(snapshot.text(), "");
4373 assert_eq!(snapshot.buffer_rows(0).collect::<Vec<_>>(), &[Some(0)]);
4374 assert_eq!(snapshot.buffer_rows(1).collect::<Vec<_>>(), &[]);
4375 }
4376
4377 #[gpui::test]
4378 fn test_singleton_multibuffer_anchors(cx: &mut AppContext) {
4379 let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
4380 let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
4381 let old_snapshot = multibuffer.read(cx).snapshot(cx);
4382 buffer.update(cx, |buffer, cx| {
4383 buffer.edit([(0..0, "X")], None, cx);
4384 buffer.edit([(5..5, "Y")], None, cx);
4385 });
4386 let new_snapshot = multibuffer.read(cx).snapshot(cx);
4387
4388 assert_eq!(old_snapshot.text(), "abcd");
4389 assert_eq!(new_snapshot.text(), "XabcdY");
4390
4391 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
4392 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
4393 assert_eq!(old_snapshot.anchor_before(4).to_offset(&new_snapshot), 5);
4394 assert_eq!(old_snapshot.anchor_after(4).to_offset(&new_snapshot), 6);
4395 }
4396
4397 #[gpui::test]
4398 fn test_multibuffer_anchors(cx: &mut AppContext) {
4399 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
4400 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
4401 let multibuffer = cx.add_model(|cx| {
4402 let mut multibuffer = MultiBuffer::new(0);
4403 multibuffer.push_excerpts(
4404 buffer_1.clone(),
4405 [ExcerptRange {
4406 context: 0..4,
4407 primary: None,
4408 }],
4409 cx,
4410 );
4411 multibuffer.push_excerpts(
4412 buffer_2.clone(),
4413 [ExcerptRange {
4414 context: 0..5,
4415 primary: None,
4416 }],
4417 cx,
4418 );
4419 multibuffer
4420 });
4421 let old_snapshot = multibuffer.read(cx).snapshot(cx);
4422
4423 assert_eq!(old_snapshot.anchor_before(0).to_offset(&old_snapshot), 0);
4424 assert_eq!(old_snapshot.anchor_after(0).to_offset(&old_snapshot), 0);
4425 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
4426 assert_eq!(Anchor::min().to_offset(&old_snapshot), 0);
4427 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
4428 assert_eq!(Anchor::max().to_offset(&old_snapshot), 10);
4429
4430 buffer_1.update(cx, |buffer, cx| {
4431 buffer.edit([(0..0, "W")], None, cx);
4432 buffer.edit([(5..5, "X")], None, cx);
4433 });
4434 buffer_2.update(cx, |buffer, cx| {
4435 buffer.edit([(0..0, "Y")], None, cx);
4436 buffer.edit([(6..6, "Z")], None, cx);
4437 });
4438 let new_snapshot = multibuffer.read(cx).snapshot(cx);
4439
4440 assert_eq!(old_snapshot.text(), "abcd\nefghi");
4441 assert_eq!(new_snapshot.text(), "WabcdX\nYefghiZ");
4442
4443 assert_eq!(old_snapshot.anchor_before(0).to_offset(&new_snapshot), 0);
4444 assert_eq!(old_snapshot.anchor_after(0).to_offset(&new_snapshot), 1);
4445 assert_eq!(old_snapshot.anchor_before(1).to_offset(&new_snapshot), 2);
4446 assert_eq!(old_snapshot.anchor_after(1).to_offset(&new_snapshot), 2);
4447 assert_eq!(old_snapshot.anchor_before(2).to_offset(&new_snapshot), 3);
4448 assert_eq!(old_snapshot.anchor_after(2).to_offset(&new_snapshot), 3);
4449 assert_eq!(old_snapshot.anchor_before(5).to_offset(&new_snapshot), 7);
4450 assert_eq!(old_snapshot.anchor_after(5).to_offset(&new_snapshot), 8);
4451 assert_eq!(old_snapshot.anchor_before(10).to_offset(&new_snapshot), 13);
4452 assert_eq!(old_snapshot.anchor_after(10).to_offset(&new_snapshot), 14);
4453 }
4454
4455 #[gpui::test]
4456 fn test_resolving_anchors_after_replacing_their_excerpts(cx: &mut AppContext) {
4457 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
4458 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
4459 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4460
4461 // Create an insertion id in buffer 1 that doesn't exist in buffer 2.
4462 // Add an excerpt from buffer 1 that spans this new insertion.
4463 buffer_1.update(cx, |buffer, cx| buffer.edit([(4..4, "123")], None, cx));
4464 let excerpt_id_1 = multibuffer.update(cx, |multibuffer, cx| {
4465 multibuffer
4466 .push_excerpts(
4467 buffer_1.clone(),
4468 [ExcerptRange {
4469 context: 0..7,
4470 primary: None,
4471 }],
4472 cx,
4473 )
4474 .pop()
4475 .unwrap()
4476 });
4477
4478 let snapshot_1 = multibuffer.read(cx).snapshot(cx);
4479 assert_eq!(snapshot_1.text(), "abcd123");
4480
4481 // Replace the buffer 1 excerpt with new excerpts from buffer 2.
4482 let (excerpt_id_2, excerpt_id_3) = multibuffer.update(cx, |multibuffer, cx| {
4483 multibuffer.remove_excerpts([excerpt_id_1], cx);
4484 let mut ids = multibuffer
4485 .push_excerpts(
4486 buffer_2.clone(),
4487 [
4488 ExcerptRange {
4489 context: 0..4,
4490 primary: None,
4491 },
4492 ExcerptRange {
4493 context: 6..10,
4494 primary: None,
4495 },
4496 ExcerptRange {
4497 context: 12..16,
4498 primary: None,
4499 },
4500 ],
4501 cx,
4502 )
4503 .into_iter();
4504 (ids.next().unwrap(), ids.next().unwrap())
4505 });
4506 let snapshot_2 = multibuffer.read(cx).snapshot(cx);
4507 assert_eq!(snapshot_2.text(), "ABCD\nGHIJ\nMNOP");
4508
4509 // The old excerpt id doesn't get reused.
4510 assert_ne!(excerpt_id_2, excerpt_id_1);
4511
4512 // Resolve some anchors from the previous snapshot in the new snapshot.
4513 // The current excerpts are from a different buffer, so we don't attempt to
4514 // resolve the old text anchor in the new buffer.
4515 assert_eq!(
4516 snapshot_2.summary_for_anchor::<usize>(&snapshot_1.anchor_before(2)),
4517 0
4518 );
4519 assert_eq!(
4520 snapshot_2.summaries_for_anchors::<usize, _>(&[
4521 snapshot_1.anchor_before(2),
4522 snapshot_1.anchor_after(3)
4523 ]),
4524 vec![0, 0]
4525 );
4526
4527 // Refresh anchors from the old snapshot. The return value indicates that both
4528 // anchors lost their original excerpt.
4529 let refresh =
4530 snapshot_2.refresh_anchors(&[snapshot_1.anchor_before(2), snapshot_1.anchor_after(3)]);
4531 assert_eq!(
4532 refresh,
4533 &[
4534 (0, snapshot_2.anchor_before(0), false),
4535 (1, snapshot_2.anchor_after(0), false),
4536 ]
4537 );
4538
4539 // Replace the middle excerpt with a smaller excerpt in buffer 2,
4540 // that intersects the old excerpt.
4541 let excerpt_id_5 = multibuffer.update(cx, |multibuffer, cx| {
4542 multibuffer.remove_excerpts([excerpt_id_3], cx);
4543 multibuffer
4544 .insert_excerpts_after(
4545 excerpt_id_2,
4546 buffer_2.clone(),
4547 [ExcerptRange {
4548 context: 5..8,
4549 primary: None,
4550 }],
4551 cx,
4552 )
4553 .pop()
4554 .unwrap()
4555 });
4556
4557 let snapshot_3 = multibuffer.read(cx).snapshot(cx);
4558 assert_eq!(snapshot_3.text(), "ABCD\nFGH\nMNOP");
4559 assert_ne!(excerpt_id_5, excerpt_id_3);
4560
4561 // Resolve some anchors from the previous snapshot in the new snapshot.
4562 // The third anchor can't be resolved, since its excerpt has been removed,
4563 // so it resolves to the same position as its predecessor.
4564 let anchors = [
4565 snapshot_2.anchor_before(0),
4566 snapshot_2.anchor_after(2),
4567 snapshot_2.anchor_after(6),
4568 snapshot_2.anchor_after(14),
4569 ];
4570 assert_eq!(
4571 snapshot_3.summaries_for_anchors::<usize, _>(&anchors),
4572 &[0, 2, 9, 13]
4573 );
4574
4575 let new_anchors = snapshot_3.refresh_anchors(&anchors);
4576 assert_eq!(
4577 new_anchors.iter().map(|a| (a.0, a.2)).collect::<Vec<_>>(),
4578 &[(0, true), (1, true), (2, true), (3, true)]
4579 );
4580 assert_eq!(
4581 snapshot_3.summaries_for_anchors::<usize, _>(new_anchors.iter().map(|a| &a.1)),
4582 &[0, 2, 7, 13]
4583 );
4584 }
4585
4586 #[gpui::test]
4587 async fn test_diff_hunks_in_range(cx: &mut TestAppContext) {
4588 use git::diff::DiffHunkStatus;
4589 init_test(cx, |_| {});
4590
4591 let fs = FakeFs::new(cx.background());
4592 let project = Project::test(fs, [], cx).await;
4593
4594 // buffer has two modified hunks with two rows each
4595 let buffer_1 = project
4596 .update(cx, |project, cx| {
4597 project.create_buffer(
4598 "
4599 1.zero
4600 1.ONE
4601 1.TWO
4602 1.three
4603 1.FOUR
4604 1.FIVE
4605 1.six
4606 "
4607 .unindent()
4608 .as_str(),
4609 None,
4610 cx,
4611 )
4612 })
4613 .unwrap();
4614 buffer_1.update(cx, |buffer, cx| {
4615 buffer.set_diff_base(
4616 Some(
4617 "
4618 1.zero
4619 1.one
4620 1.two
4621 1.three
4622 1.four
4623 1.five
4624 1.six
4625 "
4626 .unindent(),
4627 ),
4628 cx,
4629 );
4630 });
4631
4632 // buffer has a deletion hunk and an insertion hunk
4633 let buffer_2 = project
4634 .update(cx, |project, cx| {
4635 project.create_buffer(
4636 "
4637 2.zero
4638 2.one
4639 2.two
4640 2.three
4641 2.four
4642 2.five
4643 2.six
4644 "
4645 .unindent()
4646 .as_str(),
4647 None,
4648 cx,
4649 )
4650 })
4651 .unwrap();
4652 buffer_2.update(cx, |buffer, cx| {
4653 buffer.set_diff_base(
4654 Some(
4655 "
4656 2.zero
4657 2.one
4658 2.one-and-a-half
4659 2.two
4660 2.three
4661 2.four
4662 2.six
4663 "
4664 .unindent(),
4665 ),
4666 cx,
4667 );
4668 });
4669
4670 cx.foreground().run_until_parked();
4671
4672 let multibuffer = cx.add_model(|cx| {
4673 let mut multibuffer = MultiBuffer::new(0);
4674 multibuffer.push_excerpts(
4675 buffer_1.clone(),
4676 [
4677 // excerpt ends in the middle of a modified hunk
4678 ExcerptRange {
4679 context: Point::new(0, 0)..Point::new(1, 5),
4680 primary: Default::default(),
4681 },
4682 // excerpt begins in the middle of a modified hunk
4683 ExcerptRange {
4684 context: Point::new(5, 0)..Point::new(6, 5),
4685 primary: Default::default(),
4686 },
4687 ],
4688 cx,
4689 );
4690 multibuffer.push_excerpts(
4691 buffer_2.clone(),
4692 [
4693 // excerpt ends at a deletion
4694 ExcerptRange {
4695 context: Point::new(0, 0)..Point::new(1, 5),
4696 primary: Default::default(),
4697 },
4698 // excerpt starts at a deletion
4699 ExcerptRange {
4700 context: Point::new(2, 0)..Point::new(2, 5),
4701 primary: Default::default(),
4702 },
4703 // excerpt fully contains a deletion hunk
4704 ExcerptRange {
4705 context: Point::new(1, 0)..Point::new(2, 5),
4706 primary: Default::default(),
4707 },
4708 // excerpt fully contains an insertion hunk
4709 ExcerptRange {
4710 context: Point::new(4, 0)..Point::new(6, 5),
4711 primary: Default::default(),
4712 },
4713 ],
4714 cx,
4715 );
4716 multibuffer
4717 });
4718
4719 let snapshot = multibuffer.read_with(cx, |b, cx| b.snapshot(cx));
4720
4721 assert_eq!(
4722 snapshot.text(),
4723 "
4724 1.zero
4725 1.ONE
4726 1.FIVE
4727 1.six
4728 2.zero
4729 2.one
4730 2.two
4731 2.one
4732 2.two
4733 2.four
4734 2.five
4735 2.six"
4736 .unindent()
4737 );
4738
4739 let expected = [
4740 (DiffHunkStatus::Modified, 1..2),
4741 (DiffHunkStatus::Modified, 2..3),
4742 //TODO: Define better when and where removed hunks show up at range extremities
4743 (DiffHunkStatus::Removed, 6..6),
4744 (DiffHunkStatus::Removed, 8..8),
4745 (DiffHunkStatus::Added, 10..11),
4746 ];
4747
4748 assert_eq!(
4749 snapshot
4750 .git_diff_hunks_in_range(0..12)
4751 .map(|hunk| (hunk.status(), hunk.buffer_range))
4752 .collect::<Vec<_>>(),
4753 &expected,
4754 );
4755
4756 assert_eq!(
4757 snapshot
4758 .git_diff_hunks_in_range_rev(0..12)
4759 .map(|hunk| (hunk.status(), hunk.buffer_range))
4760 .collect::<Vec<_>>(),
4761 expected
4762 .iter()
4763 .rev()
4764 .cloned()
4765 .collect::<Vec<_>>()
4766 .as_slice(),
4767 );
4768 }
4769
4770 #[gpui::test(iterations = 100)]
4771 fn test_random_multibuffer(cx: &mut AppContext, mut rng: StdRng) {
4772 let operations = env::var("OPERATIONS")
4773 .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
4774 .unwrap_or(10);
4775
4776 let mut buffers: Vec<ModelHandle<Buffer>> = Vec::new();
4777 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
4778 let mut excerpt_ids = Vec::<ExcerptId>::new();
4779 let mut expected_excerpts = Vec::<(ModelHandle<Buffer>, Range<text::Anchor>)>::new();
4780 let mut anchors = Vec::new();
4781 let mut old_versions = Vec::new();
4782
4783 for _ in 0..operations {
4784 match rng.gen_range(0..100) {
4785 0..=19 if !buffers.is_empty() => {
4786 let buffer = buffers.choose(&mut rng).unwrap();
4787 buffer.update(cx, |buf, cx| buf.randomly_edit(&mut rng, 5, cx));
4788 }
4789 20..=29 if !expected_excerpts.is_empty() => {
4790 let mut ids_to_remove = vec![];
4791 for _ in 0..rng.gen_range(1..=3) {
4792 if expected_excerpts.is_empty() {
4793 break;
4794 }
4795
4796 let ix = rng.gen_range(0..expected_excerpts.len());
4797 ids_to_remove.push(excerpt_ids.remove(ix));
4798 let (buffer, range) = expected_excerpts.remove(ix);
4799 let buffer = buffer.read(cx);
4800 log::info!(
4801 "Removing excerpt {}: {:?}",
4802 ix,
4803 buffer
4804 .text_for_range(range.to_offset(buffer))
4805 .collect::<String>(),
4806 );
4807 }
4808 let snapshot = multibuffer.read(cx).read(cx);
4809 ids_to_remove.sort_unstable_by(|a, b| a.cmp(&b, &snapshot));
4810 drop(snapshot);
4811 multibuffer.update(cx, |multibuffer, cx| {
4812 multibuffer.remove_excerpts(ids_to_remove, cx)
4813 });
4814 }
4815 30..=39 if !expected_excerpts.is_empty() => {
4816 let multibuffer = multibuffer.read(cx).read(cx);
4817 let offset =
4818 multibuffer.clip_offset(rng.gen_range(0..=multibuffer.len()), Bias::Left);
4819 let bias = if rng.gen() { Bias::Left } else { Bias::Right };
4820 log::info!("Creating anchor at {} with bias {:?}", offset, bias);
4821 anchors.push(multibuffer.anchor_at(offset, bias));
4822 anchors.sort_by(|a, b| a.cmp(b, &multibuffer));
4823 }
4824 40..=44 if !anchors.is_empty() => {
4825 let multibuffer = multibuffer.read(cx).read(cx);
4826 let prev_len = anchors.len();
4827 anchors = multibuffer
4828 .refresh_anchors(&anchors)
4829 .into_iter()
4830 .map(|a| a.1)
4831 .collect();
4832
4833 // Ensure the newly-refreshed anchors point to a valid excerpt and don't
4834 // overshoot its boundaries.
4835 assert_eq!(anchors.len(), prev_len);
4836 for anchor in &anchors {
4837 if anchor.excerpt_id == ExcerptId::min()
4838 || anchor.excerpt_id == ExcerptId::max()
4839 {
4840 continue;
4841 }
4842
4843 let excerpt = multibuffer.excerpt(anchor.excerpt_id).unwrap();
4844 assert_eq!(excerpt.id, anchor.excerpt_id);
4845 assert!(excerpt.contains(anchor));
4846 }
4847 }
4848 _ => {
4849 let buffer_handle = if buffers.is_empty() || rng.gen_bool(0.4) {
4850 let base_text = util::RandomCharIter::new(&mut rng)
4851 .take(10)
4852 .collect::<String>();
4853 buffers.push(cx.add_model(|cx| Buffer::new(0, base_text, cx)));
4854 buffers.last().unwrap()
4855 } else {
4856 buffers.choose(&mut rng).unwrap()
4857 };
4858
4859 let buffer = buffer_handle.read(cx);
4860 let end_ix = buffer.clip_offset(rng.gen_range(0..=buffer.len()), Bias::Right);
4861 let start_ix = buffer.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
4862 let anchor_range = buffer.anchor_before(start_ix)..buffer.anchor_after(end_ix);
4863 let prev_excerpt_ix = rng.gen_range(0..=expected_excerpts.len());
4864 let prev_excerpt_id = excerpt_ids
4865 .get(prev_excerpt_ix)
4866 .cloned()
4867 .unwrap_or_else(ExcerptId::max);
4868 let excerpt_ix = (prev_excerpt_ix + 1).min(expected_excerpts.len());
4869
4870 log::info!(
4871 "Inserting excerpt at {} of {} for buffer {}: {:?}[{:?}] = {:?}",
4872 excerpt_ix,
4873 expected_excerpts.len(),
4874 buffer_handle.read(cx).remote_id(),
4875 buffer.text(),
4876 start_ix..end_ix,
4877 &buffer.text()[start_ix..end_ix]
4878 );
4879
4880 let excerpt_id = multibuffer.update(cx, |multibuffer, cx| {
4881 multibuffer
4882 .insert_excerpts_after(
4883 prev_excerpt_id,
4884 buffer_handle.clone(),
4885 [ExcerptRange {
4886 context: start_ix..end_ix,
4887 primary: None,
4888 }],
4889 cx,
4890 )
4891 .pop()
4892 .unwrap()
4893 });
4894
4895 excerpt_ids.insert(excerpt_ix, excerpt_id);
4896 expected_excerpts.insert(excerpt_ix, (buffer_handle.clone(), anchor_range));
4897 }
4898 }
4899
4900 if rng.gen_bool(0.3) {
4901 multibuffer.update(cx, |multibuffer, cx| {
4902 old_versions.push((multibuffer.snapshot(cx), multibuffer.subscribe()));
4903 })
4904 }
4905
4906 let snapshot = multibuffer.read(cx).snapshot(cx);
4907
4908 let mut excerpt_starts = Vec::new();
4909 let mut expected_text = String::new();
4910 let mut expected_buffer_rows = Vec::new();
4911 for (buffer, range) in &expected_excerpts {
4912 let buffer = buffer.read(cx);
4913 let buffer_range = range.to_offset(buffer);
4914
4915 excerpt_starts.push(TextSummary::from(expected_text.as_str()));
4916 expected_text.extend(buffer.text_for_range(buffer_range.clone()));
4917 expected_text.push('\n');
4918
4919 let buffer_row_range = buffer.offset_to_point(buffer_range.start).row
4920 ..=buffer.offset_to_point(buffer_range.end).row;
4921 for row in buffer_row_range {
4922 expected_buffer_rows.push(Some(row));
4923 }
4924 }
4925 // Remove final trailing newline.
4926 if !expected_excerpts.is_empty() {
4927 expected_text.pop();
4928 }
4929
4930 // Always report one buffer row
4931 if expected_buffer_rows.is_empty() {
4932 expected_buffer_rows.push(Some(0));
4933 }
4934
4935 assert_eq!(snapshot.text(), expected_text);
4936 log::info!("MultiBuffer text: {:?}", expected_text);
4937
4938 assert_eq!(
4939 snapshot.buffer_rows(0).collect::<Vec<_>>(),
4940 expected_buffer_rows,
4941 );
4942
4943 for _ in 0..5 {
4944 let start_row = rng.gen_range(0..=expected_buffer_rows.len());
4945 assert_eq!(
4946 snapshot.buffer_rows(start_row as u32).collect::<Vec<_>>(),
4947 &expected_buffer_rows[start_row..],
4948 "buffer_rows({})",
4949 start_row
4950 );
4951 }
4952
4953 assert_eq!(
4954 snapshot.max_buffer_row(),
4955 expected_buffer_rows.into_iter().flatten().max().unwrap()
4956 );
4957
4958 let mut excerpt_starts = excerpt_starts.into_iter();
4959 for (buffer, range) in &expected_excerpts {
4960 let buffer = buffer.read(cx);
4961 let buffer_id = buffer.remote_id();
4962 let buffer_range = range.to_offset(buffer);
4963 let buffer_start_point = buffer.offset_to_point(buffer_range.start);
4964 let buffer_start_point_utf16 =
4965 buffer.text_summary_for_range::<PointUtf16, _>(0..buffer_range.start);
4966
4967 let excerpt_start = excerpt_starts.next().unwrap();
4968 let mut offset = excerpt_start.len;
4969 let mut buffer_offset = buffer_range.start;
4970 let mut point = excerpt_start.lines;
4971 let mut buffer_point = buffer_start_point;
4972 let mut point_utf16 = excerpt_start.lines_utf16();
4973 let mut buffer_point_utf16 = buffer_start_point_utf16;
4974 for ch in buffer
4975 .snapshot()
4976 .chunks(buffer_range.clone(), false)
4977 .flat_map(|c| c.text.chars())
4978 {
4979 for _ in 0..ch.len_utf8() {
4980 let left_offset = snapshot.clip_offset(offset, Bias::Left);
4981 let right_offset = snapshot.clip_offset(offset, Bias::Right);
4982 let buffer_left_offset = buffer.clip_offset(buffer_offset, Bias::Left);
4983 let buffer_right_offset = buffer.clip_offset(buffer_offset, Bias::Right);
4984 assert_eq!(
4985 left_offset,
4986 excerpt_start.len + (buffer_left_offset - buffer_range.start),
4987 "clip_offset({:?}, Left). buffer: {:?}, buffer offset: {:?}",
4988 offset,
4989 buffer_id,
4990 buffer_offset,
4991 );
4992 assert_eq!(
4993 right_offset,
4994 excerpt_start.len + (buffer_right_offset - buffer_range.start),
4995 "clip_offset({:?}, Right). buffer: {:?}, buffer offset: {:?}",
4996 offset,
4997 buffer_id,
4998 buffer_offset,
4999 );
5000
5001 let left_point = snapshot.clip_point(point, Bias::Left);
5002 let right_point = snapshot.clip_point(point, Bias::Right);
5003 let buffer_left_point = buffer.clip_point(buffer_point, Bias::Left);
5004 let buffer_right_point = buffer.clip_point(buffer_point, Bias::Right);
5005 assert_eq!(
5006 left_point,
5007 excerpt_start.lines + (buffer_left_point - buffer_start_point),
5008 "clip_point({:?}, Left). buffer: {:?}, buffer point: {:?}",
5009 point,
5010 buffer_id,
5011 buffer_point,
5012 );
5013 assert_eq!(
5014 right_point,
5015 excerpt_start.lines + (buffer_right_point - buffer_start_point),
5016 "clip_point({:?}, Right). buffer: {:?}, buffer point: {:?}",
5017 point,
5018 buffer_id,
5019 buffer_point,
5020 );
5021
5022 assert_eq!(
5023 snapshot.point_to_offset(left_point),
5024 left_offset,
5025 "point_to_offset({:?})",
5026 left_point,
5027 );
5028 assert_eq!(
5029 snapshot.offset_to_point(left_offset),
5030 left_point,
5031 "offset_to_point({:?})",
5032 left_offset,
5033 );
5034
5035 offset += 1;
5036 buffer_offset += 1;
5037 if ch == '\n' {
5038 point += Point::new(1, 0);
5039 buffer_point += Point::new(1, 0);
5040 } else {
5041 point += Point::new(0, 1);
5042 buffer_point += Point::new(0, 1);
5043 }
5044 }
5045
5046 for _ in 0..ch.len_utf16() {
5047 let left_point_utf16 =
5048 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Left);
5049 let right_point_utf16 =
5050 snapshot.clip_point_utf16(Unclipped(point_utf16), Bias::Right);
5051 let buffer_left_point_utf16 =
5052 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Left);
5053 let buffer_right_point_utf16 =
5054 buffer.clip_point_utf16(Unclipped(buffer_point_utf16), Bias::Right);
5055 assert_eq!(
5056 left_point_utf16,
5057 excerpt_start.lines_utf16()
5058 + (buffer_left_point_utf16 - buffer_start_point_utf16),
5059 "clip_point_utf16({:?}, Left). buffer: {:?}, buffer point_utf16: {:?}",
5060 point_utf16,
5061 buffer_id,
5062 buffer_point_utf16,
5063 );
5064 assert_eq!(
5065 right_point_utf16,
5066 excerpt_start.lines_utf16()
5067 + (buffer_right_point_utf16 - buffer_start_point_utf16),
5068 "clip_point_utf16({:?}, Right). buffer: {:?}, buffer point_utf16: {:?}",
5069 point_utf16,
5070 buffer_id,
5071 buffer_point_utf16,
5072 );
5073
5074 if ch == '\n' {
5075 point_utf16 += PointUtf16::new(1, 0);
5076 buffer_point_utf16 += PointUtf16::new(1, 0);
5077 } else {
5078 point_utf16 += PointUtf16::new(0, 1);
5079 buffer_point_utf16 += PointUtf16::new(0, 1);
5080 }
5081 }
5082 }
5083 }
5084
5085 for (row, line) in expected_text.split('\n').enumerate() {
5086 assert_eq!(
5087 snapshot.line_len(row as u32),
5088 line.len() as u32,
5089 "line_len({}).",
5090 row
5091 );
5092 }
5093
5094 let text_rope = Rope::from(expected_text.as_str());
5095 for _ in 0..10 {
5096 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
5097 let start_ix = text_rope.clip_offset(rng.gen_range(0..=end_ix), Bias::Left);
5098
5099 let text_for_range = snapshot
5100 .text_for_range(start_ix..end_ix)
5101 .collect::<String>();
5102 assert_eq!(
5103 text_for_range,
5104 &expected_text[start_ix..end_ix],
5105 "incorrect text for range {:?}",
5106 start_ix..end_ix
5107 );
5108
5109 let excerpted_buffer_ranges = multibuffer
5110 .read(cx)
5111 .range_to_buffer_ranges(start_ix..end_ix, cx);
5112 let excerpted_buffers_text = excerpted_buffer_ranges
5113 .iter()
5114 .map(|(buffer, buffer_range)| {
5115 buffer
5116 .read(cx)
5117 .text_for_range(buffer_range.clone())
5118 .collect::<String>()
5119 })
5120 .collect::<Vec<_>>()
5121 .join("\n");
5122 assert_eq!(excerpted_buffers_text, text_for_range);
5123 if !expected_excerpts.is_empty() {
5124 assert!(!excerpted_buffer_ranges.is_empty());
5125 }
5126
5127 let expected_summary = TextSummary::from(&expected_text[start_ix..end_ix]);
5128 assert_eq!(
5129 snapshot.text_summary_for_range::<TextSummary, _>(start_ix..end_ix),
5130 expected_summary,
5131 "incorrect summary for range {:?}",
5132 start_ix..end_ix
5133 );
5134 }
5135
5136 // Anchor resolution
5137 let summaries = snapshot.summaries_for_anchors::<usize, _>(&anchors);
5138 assert_eq!(anchors.len(), summaries.len());
5139 for (anchor, resolved_offset) in anchors.iter().zip(summaries) {
5140 assert!(resolved_offset <= snapshot.len());
5141 assert_eq!(
5142 snapshot.summary_for_anchor::<usize>(anchor),
5143 resolved_offset
5144 );
5145 }
5146
5147 for _ in 0..10 {
5148 let end_ix = text_rope.clip_offset(rng.gen_range(0..=text_rope.len()), Bias::Right);
5149 assert_eq!(
5150 snapshot.reversed_chars_at(end_ix).collect::<String>(),
5151 expected_text[..end_ix].chars().rev().collect::<String>(),
5152 );
5153 }
5154
5155 for _ in 0..10 {
5156 let end_ix = rng.gen_range(0..=text_rope.len());
5157 let start_ix = rng.gen_range(0..=end_ix);
5158 assert_eq!(
5159 snapshot
5160 .bytes_in_range(start_ix..end_ix)
5161 .flatten()
5162 .copied()
5163 .collect::<Vec<_>>(),
5164 expected_text.as_bytes()[start_ix..end_ix].to_vec(),
5165 "bytes_in_range({:?})",
5166 start_ix..end_ix,
5167 );
5168 }
5169 }
5170
5171 let snapshot = multibuffer.read(cx).snapshot(cx);
5172 for (old_snapshot, subscription) in old_versions {
5173 let edits = subscription.consume().into_inner();
5174
5175 log::info!(
5176 "applying subscription edits to old text: {:?}: {:?}",
5177 old_snapshot.text(),
5178 edits,
5179 );
5180
5181 let mut text = old_snapshot.text();
5182 for edit in edits {
5183 let new_text: String = snapshot.text_for_range(edit.new.clone()).collect();
5184 text.replace_range(edit.new.start..edit.new.start + edit.old.len(), &new_text);
5185 }
5186 assert_eq!(text.to_string(), snapshot.text());
5187 }
5188 }
5189
5190 #[gpui::test]
5191 fn test_history(cx: &mut AppContext) {
5192 cx.set_global(SettingsStore::test(cx));
5193
5194 let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
5195 let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
5196 let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
5197 let group_interval = multibuffer.read(cx).history.group_interval;
5198 multibuffer.update(cx, |multibuffer, cx| {
5199 multibuffer.push_excerpts(
5200 buffer_1.clone(),
5201 [ExcerptRange {
5202 context: 0..buffer_1.read(cx).len(),
5203 primary: None,
5204 }],
5205 cx,
5206 );
5207 multibuffer.push_excerpts(
5208 buffer_2.clone(),
5209 [ExcerptRange {
5210 context: 0..buffer_2.read(cx).len(),
5211 primary: None,
5212 }],
5213 cx,
5214 );
5215 });
5216
5217 let mut now = Instant::now();
5218
5219 multibuffer.update(cx, |multibuffer, cx| {
5220 let transaction_1 = multibuffer.start_transaction_at(now, cx).unwrap();
5221 multibuffer.edit(
5222 [
5223 (Point::new(0, 0)..Point::new(0, 0), "A"),
5224 (Point::new(1, 0)..Point::new(1, 0), "A"),
5225 ],
5226 None,
5227 cx,
5228 );
5229 multibuffer.edit(
5230 [
5231 (Point::new(0, 1)..Point::new(0, 1), "B"),
5232 (Point::new(1, 1)..Point::new(1, 1), "B"),
5233 ],
5234 None,
5235 cx,
5236 );
5237 multibuffer.end_transaction_at(now, cx);
5238 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5239
5240 // Edit buffer 1 through the multibuffer
5241 now += 2 * group_interval;
5242 multibuffer.start_transaction_at(now, cx);
5243 multibuffer.edit([(2..2, "C")], None, cx);
5244 multibuffer.end_transaction_at(now, cx);
5245 assert_eq!(multibuffer.read(cx).text(), "ABC1234\nAB5678");
5246
5247 // Edit buffer 1 independently
5248 buffer_1.update(cx, |buffer_1, cx| {
5249 buffer_1.start_transaction_at(now);
5250 buffer_1.edit([(3..3, "D")], None, cx);
5251 buffer_1.end_transaction_at(now, cx);
5252
5253 now += 2 * group_interval;
5254 buffer_1.start_transaction_at(now);
5255 buffer_1.edit([(4..4, "E")], None, cx);
5256 buffer_1.end_transaction_at(now, cx);
5257 });
5258 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
5259
5260 // An undo in the multibuffer undoes the multibuffer transaction
5261 // and also any individual buffer edits that have occured since
5262 // that transaction.
5263 multibuffer.undo(cx);
5264 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5265
5266 multibuffer.undo(cx);
5267 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5268
5269 multibuffer.redo(cx);
5270 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5271
5272 multibuffer.redo(cx);
5273 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\nAB5678");
5274
5275 // Undo buffer 2 independently.
5276 buffer_2.update(cx, |buffer_2, cx| buffer_2.undo(cx));
5277 assert_eq!(multibuffer.read(cx).text(), "ABCDE1234\n5678");
5278
5279 // An undo in the multibuffer undoes the components of the
5280 // the last multibuffer transaction that are not already undone.
5281 multibuffer.undo(cx);
5282 assert_eq!(multibuffer.read(cx).text(), "AB1234\n5678");
5283
5284 multibuffer.undo(cx);
5285 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5286
5287 multibuffer.redo(cx);
5288 assert_eq!(multibuffer.read(cx).text(), "AB1234\nAB5678");
5289
5290 buffer_1.update(cx, |buffer_1, cx| buffer_1.redo(cx));
5291 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
5292
5293 // Redo stack gets cleared after an edit.
5294 now += 2 * group_interval;
5295 multibuffer.start_transaction_at(now, cx);
5296 multibuffer.edit([(0..0, "X")], None, cx);
5297 multibuffer.end_transaction_at(now, cx);
5298 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5299 multibuffer.redo(cx);
5300 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5301 multibuffer.undo(cx);
5302 assert_eq!(multibuffer.read(cx).text(), "ABCD1234\nAB5678");
5303 multibuffer.undo(cx);
5304 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5305
5306 // Transactions can be grouped manually.
5307 multibuffer.redo(cx);
5308 multibuffer.redo(cx);
5309 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5310 multibuffer.group_until_transaction(transaction_1, cx);
5311 multibuffer.undo(cx);
5312 assert_eq!(multibuffer.read(cx).text(), "1234\n5678");
5313 multibuffer.redo(cx);
5314 assert_eq!(multibuffer.read(cx).text(), "XABCD1234\nAB5678");
5315 });
5316 }
5317}