1use anyhow::{Context as _, Result};
2use channel::{ChannelChat, ChannelStore, MessageParams};
3use client::{UserId, UserStore};
4use collections::HashSet;
5use editor::{AnchorRangeExt, CompletionProvider, Editor, EditorElement, EditorStyle, ExcerptId};
6use fuzzy::{StringMatch, StringMatchCandidate};
7use gpui::{
8 AsyncApp, AsyncWindowContext, Context, Entity, Focusable, FontStyle, FontWeight,
9 HighlightStyle, IntoElement, Render, Task, TextStyle, WeakEntity, Window,
10};
11use language::{
12 Anchor, Buffer, BufferSnapshot, CodeLabel, LanguageRegistry, ToOffset,
13 language_settings::SoftWrap,
14};
15use project::{Completion, CompletionSource, search::SearchQuery};
16use settings::Settings;
17use std::{
18 cell::RefCell,
19 ops::Range,
20 rc::Rc,
21 sync::{Arc, LazyLock},
22 time::Duration,
23};
24use theme::ThemeSettings;
25use ui::{TextSize, prelude::*};
26
27use crate::panel_settings::MessageEditorSettings;
28
29const MENTIONS_DEBOUNCE_INTERVAL: Duration = Duration::from_millis(50);
30
31static MENTIONS_SEARCH: LazyLock<SearchQuery> = LazyLock::new(|| {
32 SearchQuery::regex(
33 "@[-_\\w]+",
34 false,
35 false,
36 false,
37 Default::default(),
38 Default::default(),
39 None,
40 )
41 .unwrap()
42});
43
44pub struct MessageEditor {
45 pub editor: Entity<Editor>,
46 user_store: Entity<UserStore>,
47 channel_chat: Option<Entity<ChannelChat>>,
48 mentions: Vec<UserId>,
49 mentions_task: Option<Task<()>>,
50 reply_to_message_id: Option<u64>,
51 edit_message_id: Option<u64>,
52}
53
54struct MessageEditorCompletionProvider(WeakEntity<MessageEditor>);
55
56impl CompletionProvider for MessageEditorCompletionProvider {
57 fn completions(
58 &self,
59 _excerpt_id: ExcerptId,
60 buffer: &Entity<Buffer>,
61 buffer_position: language::Anchor,
62 _: editor::CompletionContext,
63 _window: &mut Window,
64 cx: &mut Context<Editor>,
65 ) -> Task<Result<Option<Vec<Completion>>>> {
66 let Some(handle) = self.0.upgrade() else {
67 return Task::ready(Ok(None));
68 };
69 handle.update(cx, |message_editor, cx| {
70 message_editor.completions(buffer, buffer_position, cx)
71 })
72 }
73
74 fn resolve_completions(
75 &self,
76 _buffer: Entity<Buffer>,
77 _completion_indices: Vec<usize>,
78 _completions: Rc<RefCell<Box<[Completion]>>>,
79 _cx: &mut Context<Editor>,
80 ) -> Task<anyhow::Result<bool>> {
81 Task::ready(Ok(false))
82 }
83
84 fn is_completion_trigger(
85 &self,
86 _buffer: &Entity<Buffer>,
87 _position: language::Anchor,
88 text: &str,
89 _trigger_in_words: bool,
90 _cx: &mut Context<Editor>,
91 ) -> bool {
92 text == "@"
93 }
94}
95
96impl MessageEditor {
97 pub fn new(
98 language_registry: Arc<LanguageRegistry>,
99 user_store: Entity<UserStore>,
100 channel_chat: Option<Entity<ChannelChat>>,
101 editor: Entity<Editor>,
102 window: &mut Window,
103 cx: &mut Context<Self>,
104 ) -> Self {
105 let this = cx.entity().downgrade();
106 editor.update(cx, |editor, cx| {
107 editor.set_soft_wrap_mode(SoftWrap::EditorWidth, cx);
108 editor.set_use_autoclose(false);
109 editor.set_show_gutter(false, cx);
110 editor.set_show_wrap_guides(false, cx);
111 editor.set_show_indent_guides(false, cx);
112 editor.set_completion_provider(Some(Box::new(MessageEditorCompletionProvider(this))));
113 editor.set_auto_replace_emoji_shortcode(
114 MessageEditorSettings::get_global(cx)
115 .auto_replace_emoji_shortcode
116 .unwrap_or_default(),
117 );
118 });
119
120 let buffer = editor
121 .read(cx)
122 .buffer()
123 .read(cx)
124 .as_singleton()
125 .expect("message editor must be singleton");
126
127 cx.subscribe_in(&buffer, window, Self::on_buffer_event)
128 .detach();
129 cx.observe_global::<settings::SettingsStore>(|this, cx| {
130 this.editor.update(cx, |editor, cx| {
131 editor.set_auto_replace_emoji_shortcode(
132 MessageEditorSettings::get_global(cx)
133 .auto_replace_emoji_shortcode
134 .unwrap_or_default(),
135 )
136 })
137 })
138 .detach();
139
140 let markdown = language_registry.language_for_name("Markdown");
141 cx.spawn_in(window, async move |_, cx| {
142 let markdown = markdown.await.context("failed to load Markdown language")?;
143 buffer.update(cx, |buffer, cx| buffer.set_language(Some(markdown), cx))
144 })
145 .detach_and_log_err(cx);
146
147 Self {
148 editor,
149 user_store,
150 channel_chat,
151 mentions: Vec::new(),
152 mentions_task: None,
153 reply_to_message_id: None,
154 edit_message_id: None,
155 }
156 }
157
158 pub fn reply_to_message_id(&self) -> Option<u64> {
159 self.reply_to_message_id
160 }
161
162 pub fn set_reply_to_message_id(&mut self, reply_to_message_id: u64) {
163 self.reply_to_message_id = Some(reply_to_message_id);
164 }
165
166 pub fn clear_reply_to_message_id(&mut self) {
167 self.reply_to_message_id = None;
168 }
169
170 pub fn edit_message_id(&self) -> Option<u64> {
171 self.edit_message_id
172 }
173
174 pub fn set_edit_message_id(&mut self, edit_message_id: u64) {
175 self.edit_message_id = Some(edit_message_id);
176 }
177
178 pub fn clear_edit_message_id(&mut self) {
179 self.edit_message_id = None;
180 }
181
182 pub fn set_channel_chat(&mut self, chat: Entity<ChannelChat>, cx: &mut Context<Self>) {
183 let channel_id = chat.read(cx).channel_id;
184 self.channel_chat = Some(chat);
185 let channel_name = ChannelStore::global(cx)
186 .read(cx)
187 .channel_for_id(channel_id)
188 .map(|channel| channel.name.clone());
189 self.editor.update(cx, |editor, cx| {
190 if let Some(channel_name) = channel_name {
191 editor.set_placeholder_text(format!("Message #{channel_name}"), cx);
192 } else {
193 editor.set_placeholder_text("Message Channel", cx);
194 }
195 });
196 }
197
198 pub fn take_message(&mut self, window: &mut Window, cx: &mut Context<Self>) -> MessageParams {
199 self.editor.update(cx, |editor, cx| {
200 let highlights = editor.text_highlights::<Self>(cx);
201 let text = editor.text(cx);
202 let snapshot = editor.buffer().read(cx).snapshot(cx);
203 let mentions = if let Some((_, ranges)) = highlights {
204 ranges
205 .iter()
206 .map(|range| range.to_offset(&snapshot))
207 .zip(self.mentions.iter().copied())
208 .collect()
209 } else {
210 Vec::new()
211 };
212
213 editor.clear(window, cx);
214 self.mentions.clear();
215 let reply_to_message_id = std::mem::take(&mut self.reply_to_message_id);
216
217 MessageParams {
218 text,
219 mentions,
220 reply_to_message_id,
221 }
222 })
223 }
224
225 fn on_buffer_event(
226 &mut self,
227 buffer: &Entity<Buffer>,
228 event: &language::BufferEvent,
229 window: &mut Window,
230 cx: &mut Context<Self>,
231 ) {
232 if let language::BufferEvent::Reparsed | language::BufferEvent::Edited = event {
233 let buffer = buffer.read(cx).snapshot();
234 self.mentions_task = Some(cx.spawn_in(window, async move |this, cx| {
235 cx.background_executor()
236 .timer(MENTIONS_DEBOUNCE_INTERVAL)
237 .await;
238 Self::find_mentions(this, buffer, cx).await;
239 }));
240 }
241 }
242
243 fn completions(
244 &mut self,
245 buffer: &Entity<Buffer>,
246 end_anchor: Anchor,
247 cx: &mut Context<Self>,
248 ) -> Task<Result<Option<Vec<Completion>>>> {
249 if let Some((start_anchor, query, candidates)) =
250 self.collect_mention_candidates(buffer, end_anchor, cx)
251 {
252 if !candidates.is_empty() {
253 return cx.spawn(async move |_, cx| {
254 Ok(Some(
255 Self::resolve_completions_for_candidates(
256 &cx,
257 query.as_str(),
258 &candidates,
259 start_anchor..end_anchor,
260 Self::completion_for_mention,
261 )
262 .await,
263 ))
264 });
265 }
266 }
267
268 if let Some((start_anchor, query, candidates)) =
269 self.collect_emoji_candidates(buffer, end_anchor, cx)
270 {
271 if !candidates.is_empty() {
272 return cx.spawn(async move |_, cx| {
273 Ok(Some(
274 Self::resolve_completions_for_candidates(
275 &cx,
276 query.as_str(),
277 candidates,
278 start_anchor..end_anchor,
279 Self::completion_for_emoji,
280 )
281 .await,
282 ))
283 });
284 }
285 }
286
287 Task::ready(Ok(Some(Vec::new())))
288 }
289
290 async fn resolve_completions_for_candidates(
291 cx: &AsyncApp,
292 query: &str,
293 candidates: &[StringMatchCandidate],
294 range: Range<Anchor>,
295 completion_fn: impl Fn(&StringMatch) -> (String, CodeLabel),
296 ) -> Vec<Completion> {
297 let matches = fuzzy::match_strings(
298 candidates,
299 query,
300 true,
301 10,
302 &Default::default(),
303 cx.background_executor().clone(),
304 )
305 .await;
306
307 matches
308 .into_iter()
309 .map(|mat| {
310 let (new_text, label) = completion_fn(&mat);
311 Completion {
312 old_range: range.clone(),
313 new_text,
314 label,
315 icon_path: None,
316 confirm: None,
317 documentation: None,
318 source: CompletionSource::Custom,
319 }
320 })
321 .collect()
322 }
323
324 fn completion_for_mention(mat: &StringMatch) -> (String, CodeLabel) {
325 let label = CodeLabel {
326 filter_range: 1..mat.string.len() + 1,
327 text: format!("@{}", mat.string),
328 runs: Vec::new(),
329 };
330 (mat.string.clone(), label)
331 }
332
333 fn completion_for_emoji(mat: &StringMatch) -> (String, CodeLabel) {
334 let emoji = emojis::get_by_shortcode(&mat.string).unwrap();
335 let label = CodeLabel {
336 filter_range: 1..mat.string.len() + 1,
337 text: format!(":{}: {}", mat.string, emoji),
338 runs: Vec::new(),
339 };
340 (emoji.to_string(), label)
341 }
342
343 fn collect_mention_candidates(
344 &mut self,
345 buffer: &Entity<Buffer>,
346 end_anchor: Anchor,
347 cx: &mut Context<Self>,
348 ) -> Option<(Anchor, String, Vec<StringMatchCandidate>)> {
349 let end_offset = end_anchor.to_offset(buffer.read(cx));
350
351 let query = buffer.update(cx, |buffer, _| {
352 let mut query = String::new();
353 for ch in buffer.reversed_chars_at(end_offset).take(100) {
354 if ch == '@' {
355 return Some(query.chars().rev().collect::<String>());
356 }
357 if ch.is_whitespace() || !ch.is_ascii() {
358 break;
359 }
360 query.push(ch);
361 }
362 None
363 })?;
364
365 let start_offset = end_offset - query.len();
366 let start_anchor = buffer.read(cx).anchor_before(start_offset);
367
368 let mut names = HashSet::default();
369 if let Some(chat) = self.channel_chat.as_ref() {
370 let chat = chat.read(cx);
371 for participant in ChannelStore::global(cx)
372 .read(cx)
373 .channel_participants(chat.channel_id)
374 {
375 names.insert(participant.github_login.clone());
376 }
377 for message in chat
378 .messages_in_range(chat.message_count().saturating_sub(100)..chat.message_count())
379 {
380 names.insert(message.sender.github_login.clone());
381 }
382 }
383
384 let candidates = names
385 .into_iter()
386 .map(|user| StringMatchCandidate::new(0, &user))
387 .collect::<Vec<_>>();
388
389 Some((start_anchor, query, candidates))
390 }
391
392 fn collect_emoji_candidates(
393 &mut self,
394 buffer: &Entity<Buffer>,
395 end_anchor: Anchor,
396 cx: &mut Context<Self>,
397 ) -> Option<(Anchor, String, &'static [StringMatchCandidate])> {
398 static EMOJI_FUZZY_MATCH_CANDIDATES: LazyLock<Vec<StringMatchCandidate>> =
399 LazyLock::new(|| {
400 let emojis = emojis::iter()
401 .flat_map(|s| s.shortcodes())
402 .map(|emoji| StringMatchCandidate::new(0, emoji))
403 .collect::<Vec<_>>();
404 emojis
405 });
406
407 let end_offset = end_anchor.to_offset(buffer.read(cx));
408
409 let query = buffer.update(cx, |buffer, _| {
410 let mut query = String::new();
411 for ch in buffer.reversed_chars_at(end_offset).take(100) {
412 if ch == ':' {
413 let next_char = buffer
414 .reversed_chars_at(end_offset - query.len() - 1)
415 .next();
416 // Ensure we are at the start of the message or that the previous character is a whitespace
417 if next_char.is_none() || next_char.unwrap().is_whitespace() {
418 return Some(query.chars().rev().collect::<String>());
419 }
420
421 // If the previous character is not a whitespace, we are in the middle of a word
422 // and we only want to complete the shortcode if the word is made up of other emojis
423 let mut containing_word = String::new();
424 for ch in buffer
425 .reversed_chars_at(end_offset - query.len() - 1)
426 .take(100)
427 {
428 if ch.is_whitespace() {
429 break;
430 }
431 containing_word.push(ch);
432 }
433 let containing_word = containing_word.chars().rev().collect::<String>();
434 if util::word_consists_of_emojis(containing_word.as_str()) {
435 return Some(query.chars().rev().collect::<String>());
436 }
437 break;
438 }
439 if ch.is_whitespace() || !ch.is_ascii() {
440 break;
441 }
442 query.push(ch);
443 }
444 None
445 })?;
446
447 let start_offset = end_offset - query.len() - 1;
448 let start_anchor = buffer.read(cx).anchor_before(start_offset);
449
450 Some((start_anchor, query, &EMOJI_FUZZY_MATCH_CANDIDATES))
451 }
452
453 async fn find_mentions(
454 this: WeakEntity<MessageEditor>,
455 buffer: BufferSnapshot,
456 cx: &mut AsyncWindowContext,
457 ) {
458 let (buffer, ranges) = cx
459 .background_spawn(async move {
460 let ranges = MENTIONS_SEARCH.search(&buffer, None).await;
461 (buffer, ranges)
462 })
463 .await;
464
465 this.update(cx, |this, cx| {
466 let mut anchor_ranges = Vec::new();
467 let mut mentioned_user_ids = Vec::new();
468 let mut text = String::new();
469
470 this.editor.update(cx, |editor, cx| {
471 let multi_buffer = editor.buffer().read(cx).snapshot(cx);
472 for range in ranges {
473 text.clear();
474 text.extend(buffer.text_for_range(range.clone()));
475 if let Some(username) = text.strip_prefix('@') {
476 if let Some(user) = this
477 .user_store
478 .read(cx)
479 .cached_user_by_github_login(username)
480 {
481 let start = multi_buffer.anchor_after(range.start);
482 let end = multi_buffer.anchor_after(range.end);
483
484 mentioned_user_ids.push(user.id);
485 anchor_ranges.push(start..end);
486 }
487 }
488 }
489
490 editor.clear_highlights::<Self>(cx);
491 editor.highlight_text::<Self>(
492 anchor_ranges,
493 HighlightStyle {
494 font_weight: Some(FontWeight::BOLD),
495 ..Default::default()
496 },
497 cx,
498 )
499 });
500
501 this.mentions = mentioned_user_ids;
502 this.mentions_task.take();
503 })
504 .ok();
505 }
506
507 pub(crate) fn focus_handle(&self, cx: &gpui::App) -> gpui::FocusHandle {
508 self.editor.read(cx).focus_handle(cx)
509 }
510}
511
512impl Render for MessageEditor {
513 fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
514 let settings = ThemeSettings::get_global(cx);
515 let text_style = TextStyle {
516 color: if self.editor.read(cx).read_only(cx) {
517 cx.theme().colors().text_disabled
518 } else {
519 cx.theme().colors().text
520 },
521 font_family: settings.ui_font.family.clone(),
522 font_features: settings.ui_font.features.clone(),
523 font_fallbacks: settings.ui_font.fallbacks.clone(),
524 font_size: TextSize::Small.rems(cx).into(),
525 font_weight: settings.ui_font.weight,
526 font_style: FontStyle::Normal,
527 line_height: relative(1.3),
528 ..Default::default()
529 };
530
531 div()
532 .w_full()
533 .px_2()
534 .py_1()
535 .bg(cx.theme().colors().editor_background)
536 .rounded_sm()
537 .child(EditorElement::new(
538 &self.editor,
539 EditorStyle {
540 local_player: cx.theme().players().local(),
541 text: text_style,
542 ..Default::default()
543 },
544 ))
545 }
546}