1use crate::{ApplyAllDiffHunks, Editor, EditorEvent, SemanticsProvider};
2use collections::HashSet;
3use futures::{channel::mpsc, future::join_all};
4use gpui::{AppContext, EventEmitter, FocusableView, Model, Render, Subscription, Task, View};
5use language::{Buffer, BufferEvent, Capability};
6use multi_buffer::{ExcerptRange, MultiBuffer};
7use project::{buffer_store::BufferChangeSet, Project};
8use smol::stream::StreamExt;
9use std::{any::TypeId, ops::Range, rc::Rc, time::Duration};
10use text::ToOffset;
11use ui::{prelude::*, ButtonLike, KeyBinding};
12use workspace::{
13 searchable::SearchableItemHandle, Item, ItemHandle as _, ToolbarItemEvent, ToolbarItemLocation,
14 ToolbarItemView, Workspace,
15};
16
17pub struct ProposedChangesEditor {
18 editor: View<Editor>,
19 multibuffer: Model<MultiBuffer>,
20 title: SharedString,
21 buffer_entries: Vec<BufferEntry>,
22 _recalculate_diffs_task: Task<Option<()>>,
23 recalculate_diffs_tx: mpsc::UnboundedSender<RecalculateDiff>,
24}
25
26pub struct ProposedChangeLocation<T> {
27 pub buffer: Model<Buffer>,
28 pub ranges: Vec<Range<T>>,
29}
30
31struct BufferEntry {
32 base: Model<Buffer>,
33 branch: Model<Buffer>,
34 _subscription: Subscription,
35}
36
37pub struct ProposedChangesEditorToolbar {
38 current_editor: Option<View<ProposedChangesEditor>>,
39}
40
41struct RecalculateDiff {
42 buffer: Model<Buffer>,
43 debounce: bool,
44}
45
46/// A provider of code semantics for branch buffers.
47///
48/// Requests in edited regions will return nothing, but requests in unchanged
49/// regions will be translated into the base buffer's coordinates.
50struct BranchBufferSemanticsProvider(Rc<dyn SemanticsProvider>);
51
52impl ProposedChangesEditor {
53 pub fn new<T: ToOffset>(
54 title: impl Into<SharedString>,
55 locations: Vec<ProposedChangeLocation<T>>,
56 project: Option<Model<Project>>,
57 cx: &mut ViewContext<Self>,
58 ) -> Self {
59 let multibuffer = cx.new_model(|_| MultiBuffer::new(Capability::ReadWrite));
60 let (recalculate_diffs_tx, mut recalculate_diffs_rx) = mpsc::unbounded();
61 let mut this = Self {
62 editor: cx.new_view(|cx| {
63 let mut editor = Editor::for_multibuffer(multibuffer.clone(), project, true, cx);
64 editor.set_expand_all_diff_hunks(cx);
65 editor.set_completion_provider(None);
66 editor.clear_code_action_providers();
67 editor.set_semantics_provider(
68 editor
69 .semantics_provider()
70 .map(|provider| Rc::new(BranchBufferSemanticsProvider(provider)) as _),
71 );
72 editor
73 }),
74 multibuffer,
75 title: title.into(),
76 buffer_entries: Vec::new(),
77 recalculate_diffs_tx,
78 _recalculate_diffs_task: cx.spawn(|this, mut cx| async move {
79 let mut buffers_to_diff = HashSet::default();
80 while let Some(mut recalculate_diff) = recalculate_diffs_rx.next().await {
81 buffers_to_diff.insert(recalculate_diff.buffer);
82
83 while recalculate_diff.debounce {
84 cx.background_executor()
85 .timer(Duration::from_millis(50))
86 .await;
87 let mut had_further_changes = false;
88 while let Ok(next_recalculate_diff) = recalculate_diffs_rx.try_next() {
89 let next_recalculate_diff = next_recalculate_diff?;
90 recalculate_diff.debounce &= next_recalculate_diff.debounce;
91 buffers_to_diff.insert(next_recalculate_diff.buffer);
92 had_further_changes = true;
93 }
94 if !had_further_changes {
95 break;
96 }
97 }
98
99 let recalculate_diff_futures = this
100 .update(&mut cx, |this, cx| {
101 buffers_to_diff
102 .drain()
103 .filter_map(|buffer| {
104 let buffer = buffer.read(cx);
105 let base_buffer = buffer.base_buffer()?;
106 let buffer = buffer.text_snapshot();
107 let change_set = this
108 .multibuffer
109 .read(cx)
110 .change_set_for(buffer.remote_id())?;
111 Some(change_set.update(cx, |change_set, cx| {
112 change_set.set_base_text(
113 base_buffer.read(cx).text(),
114 buffer,
115 cx,
116 )
117 }))
118 })
119 .collect::<Vec<_>>()
120 })
121 .ok()?;
122
123 join_all(recalculate_diff_futures).await;
124 }
125 None
126 }),
127 };
128 this.reset_locations(locations, cx);
129 this
130 }
131
132 pub fn branch_buffer_for_base(&self, base_buffer: &Model<Buffer>) -> Option<Model<Buffer>> {
133 self.buffer_entries.iter().find_map(|entry| {
134 if &entry.base == base_buffer {
135 Some(entry.branch.clone())
136 } else {
137 None
138 }
139 })
140 }
141
142 pub fn set_title(&mut self, title: SharedString, cx: &mut ViewContext<Self>) {
143 self.title = title;
144 cx.notify();
145 }
146
147 pub fn reset_locations<T: ToOffset>(
148 &mut self,
149 locations: Vec<ProposedChangeLocation<T>>,
150 cx: &mut ViewContext<Self>,
151 ) {
152 // Undo all branch changes
153 for entry in &self.buffer_entries {
154 let base_version = entry.base.read(cx).version();
155 entry.branch.update(cx, |buffer, cx| {
156 let undo_counts = buffer
157 .operations()
158 .iter()
159 .filter_map(|(timestamp, _)| {
160 if !base_version.observed(*timestamp) {
161 Some((*timestamp, u32::MAX))
162 } else {
163 None
164 }
165 })
166 .collect();
167 buffer.undo_operations(undo_counts, cx);
168 });
169 }
170
171 self.multibuffer.update(cx, |multibuffer, cx| {
172 multibuffer.clear(cx);
173 });
174
175 let mut buffer_entries = Vec::new();
176 let mut new_change_sets = Vec::new();
177 for location in locations {
178 let branch_buffer;
179 if let Some(ix) = self
180 .buffer_entries
181 .iter()
182 .position(|entry| entry.base == location.buffer)
183 {
184 let entry = self.buffer_entries.remove(ix);
185 branch_buffer = entry.branch.clone();
186 buffer_entries.push(entry);
187 } else {
188 branch_buffer = location.buffer.update(cx, |buffer, cx| buffer.branch(cx));
189 new_change_sets.push(cx.new_model(|cx| {
190 let mut change_set = BufferChangeSet::new(&branch_buffer, cx);
191 let _ = change_set.set_base_text(
192 location.buffer.read(cx).text(),
193 branch_buffer.read(cx).text_snapshot(),
194 cx,
195 );
196 change_set
197 }));
198 buffer_entries.push(BufferEntry {
199 branch: branch_buffer.clone(),
200 base: location.buffer.clone(),
201 _subscription: cx.subscribe(&branch_buffer, Self::on_buffer_event),
202 });
203 }
204
205 self.multibuffer.update(cx, |multibuffer, cx| {
206 multibuffer.push_excerpts(
207 branch_buffer,
208 location.ranges.into_iter().map(|range| ExcerptRange {
209 context: range,
210 primary: None,
211 }),
212 cx,
213 );
214 });
215 }
216
217 self.buffer_entries = buffer_entries;
218 self.editor.update(cx, |editor, cx| {
219 editor.change_selections(None, cx, |selections| selections.refresh());
220 editor.buffer.update(cx, |buffer, cx| {
221 for change_set in new_change_sets {
222 buffer.add_change_set(change_set, cx)
223 }
224 })
225 });
226 }
227
228 pub fn recalculate_all_buffer_diffs(&self) {
229 for (ix, entry) in self.buffer_entries.iter().enumerate().rev() {
230 self.recalculate_diffs_tx
231 .unbounded_send(RecalculateDiff {
232 buffer: entry.branch.clone(),
233 debounce: ix > 0,
234 })
235 .ok();
236 }
237 }
238
239 fn on_buffer_event(
240 &mut self,
241 buffer: Model<Buffer>,
242 event: &BufferEvent,
243 _cx: &mut ViewContext<Self>,
244 ) {
245 match event {
246 BufferEvent::Operation { .. } => {
247 self.recalculate_diffs_tx
248 .unbounded_send(RecalculateDiff {
249 buffer,
250 debounce: true,
251 })
252 .ok();
253 }
254 // BufferEvent::DiffBaseChanged => {
255 // self.recalculate_diffs_tx
256 // .unbounded_send(RecalculateDiff {
257 // buffer,
258 // debounce: false,
259 // })
260 // .ok();
261 // }
262 _ => (),
263 }
264 }
265}
266
267impl Render for ProposedChangesEditor {
268 fn render(&mut self, _cx: &mut ViewContext<Self>) -> impl IntoElement {
269 div()
270 .size_full()
271 .key_context("ProposedChangesEditor")
272 .child(self.editor.clone())
273 }
274}
275
276impl FocusableView for ProposedChangesEditor {
277 fn focus_handle(&self, cx: &AppContext) -> gpui::FocusHandle {
278 self.editor.focus_handle(cx)
279 }
280}
281
282impl EventEmitter<EditorEvent> for ProposedChangesEditor {}
283
284impl Item for ProposedChangesEditor {
285 type Event = EditorEvent;
286
287 fn tab_icon(&self, _cx: &WindowContext) -> Option<Icon> {
288 Some(Icon::new(IconName::Diff))
289 }
290
291 fn tab_content_text(&self, _cx: &WindowContext) -> Option<SharedString> {
292 Some(self.title.clone())
293 }
294
295 fn as_searchable(&self, _: &View<Self>) -> Option<Box<dyn SearchableItemHandle>> {
296 Some(Box::new(self.editor.clone()))
297 }
298
299 fn act_as_type<'a>(
300 &'a self,
301 type_id: TypeId,
302 self_handle: &'a View<Self>,
303 _: &'a AppContext,
304 ) -> Option<gpui::AnyView> {
305 if type_id == TypeId::of::<Self>() {
306 Some(self_handle.to_any())
307 } else if type_id == TypeId::of::<Editor>() {
308 Some(self.editor.to_any())
309 } else {
310 None
311 }
312 }
313
314 fn added_to_workspace(&mut self, workspace: &mut Workspace, cx: &mut ViewContext<Self>) {
315 self.editor.update(cx, |editor, cx| {
316 Item::added_to_workspace(editor, workspace, cx)
317 });
318 }
319
320 fn deactivated(&mut self, cx: &mut ViewContext<Self>) {
321 self.editor.update(cx, Item::deactivated);
322 }
323
324 fn navigate(&mut self, data: Box<dyn std::any::Any>, cx: &mut ViewContext<Self>) -> bool {
325 self.editor
326 .update(cx, |editor, cx| Item::navigate(editor, data, cx))
327 }
328
329 fn set_nav_history(
330 &mut self,
331 nav_history: workspace::ItemNavHistory,
332 cx: &mut ViewContext<Self>,
333 ) {
334 self.editor.update(cx, |editor, cx| {
335 Item::set_nav_history(editor, nav_history, cx)
336 });
337 }
338
339 fn can_save(&self, cx: &AppContext) -> bool {
340 self.editor.read(cx).can_save(cx)
341 }
342
343 fn save(
344 &mut self,
345 format: bool,
346 project: Model<Project>,
347 cx: &mut ViewContext<Self>,
348 ) -> Task<gpui::Result<()>> {
349 self.editor
350 .update(cx, |editor, cx| Item::save(editor, format, project, cx))
351 }
352}
353
354impl ProposedChangesEditorToolbar {
355 pub fn new() -> Self {
356 Self {
357 current_editor: None,
358 }
359 }
360
361 fn get_toolbar_item_location(&self) -> ToolbarItemLocation {
362 if self.current_editor.is_some() {
363 ToolbarItemLocation::PrimaryRight
364 } else {
365 ToolbarItemLocation::Hidden
366 }
367 }
368}
369
370impl Render for ProposedChangesEditorToolbar {
371 fn render(&mut self, cx: &mut ViewContext<Self>) -> impl IntoElement {
372 let button_like = ButtonLike::new("apply-changes").child(Label::new("Apply All"));
373
374 match &self.current_editor {
375 Some(editor) => {
376 let focus_handle = editor.focus_handle(cx);
377 let keybinding = KeyBinding::for_action_in(&ApplyAllDiffHunks, &focus_handle, cx)
378 .map(|binding| binding.into_any_element());
379
380 button_like.children(keybinding).on_click({
381 move |_event, cx| focus_handle.dispatch_action(&ApplyAllDiffHunks, cx)
382 })
383 }
384 None => button_like.disabled(true),
385 }
386 }
387}
388
389impl EventEmitter<ToolbarItemEvent> for ProposedChangesEditorToolbar {}
390
391impl ToolbarItemView for ProposedChangesEditorToolbar {
392 fn set_active_pane_item(
393 &mut self,
394 active_pane_item: Option<&dyn workspace::ItemHandle>,
395 _cx: &mut ViewContext<Self>,
396 ) -> workspace::ToolbarItemLocation {
397 self.current_editor =
398 active_pane_item.and_then(|item| item.downcast::<ProposedChangesEditor>());
399 self.get_toolbar_item_location()
400 }
401}
402
403impl BranchBufferSemanticsProvider {
404 fn to_base(
405 &self,
406 buffer: &Model<Buffer>,
407 positions: &[text::Anchor],
408 cx: &AppContext,
409 ) -> Option<Model<Buffer>> {
410 let base_buffer = buffer.read(cx).base_buffer()?;
411 let version = base_buffer.read(cx).version();
412 if positions
413 .iter()
414 .any(|position| !version.observed(position.timestamp))
415 {
416 return None;
417 }
418 Some(base_buffer)
419 }
420}
421
422impl SemanticsProvider for BranchBufferSemanticsProvider {
423 fn hover(
424 &self,
425 buffer: &Model<Buffer>,
426 position: text::Anchor,
427 cx: &mut AppContext,
428 ) -> Option<Task<Vec<project::Hover>>> {
429 let buffer = self.to_base(buffer, &[position], cx)?;
430 self.0.hover(&buffer, position, cx)
431 }
432
433 fn inlay_hints(
434 &self,
435 buffer: Model<Buffer>,
436 range: Range<text::Anchor>,
437 cx: &mut AppContext,
438 ) -> Option<Task<anyhow::Result<Vec<project::InlayHint>>>> {
439 let buffer = self.to_base(&buffer, &[range.start, range.end], cx)?;
440 self.0.inlay_hints(buffer, range, cx)
441 }
442
443 fn resolve_inlay_hint(
444 &self,
445 hint: project::InlayHint,
446 buffer: Model<Buffer>,
447 server_id: lsp::LanguageServerId,
448 cx: &mut AppContext,
449 ) -> Option<Task<anyhow::Result<project::InlayHint>>> {
450 let buffer = self.to_base(&buffer, &[], cx)?;
451 self.0.resolve_inlay_hint(hint, buffer, server_id, cx)
452 }
453
454 fn supports_inlay_hints(&self, buffer: &Model<Buffer>, cx: &AppContext) -> bool {
455 if let Some(buffer) = self.to_base(&buffer, &[], cx) {
456 self.0.supports_inlay_hints(&buffer, cx)
457 } else {
458 false
459 }
460 }
461
462 fn document_highlights(
463 &self,
464 buffer: &Model<Buffer>,
465 position: text::Anchor,
466 cx: &mut AppContext,
467 ) -> Option<Task<gpui::Result<Vec<project::DocumentHighlight>>>> {
468 let buffer = self.to_base(&buffer, &[position], cx)?;
469 self.0.document_highlights(&buffer, position, cx)
470 }
471
472 fn definitions(
473 &self,
474 buffer: &Model<Buffer>,
475 position: text::Anchor,
476 kind: crate::GotoDefinitionKind,
477 cx: &mut AppContext,
478 ) -> Option<Task<gpui::Result<Vec<project::LocationLink>>>> {
479 let buffer = self.to_base(&buffer, &[position], cx)?;
480 self.0.definitions(&buffer, position, kind, cx)
481 }
482
483 fn range_for_rename(
484 &self,
485 _: &Model<Buffer>,
486 _: text::Anchor,
487 _: &mut AppContext,
488 ) -> Option<Task<gpui::Result<Option<Range<text::Anchor>>>>> {
489 None
490 }
491
492 fn perform_rename(
493 &self,
494 _: &Model<Buffer>,
495 _: text::Anchor,
496 _: String,
497 _: &mut AppContext,
498 ) -> Option<Task<gpui::Result<project::ProjectTransaction>>> {
499 None
500 }
501}