-
-
Notifications
You must be signed in to change notification settings - Fork 2.5k
/
completion.rs
465 lines (434 loc) · 16.1 KB
/
completion.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
use std::collections::HashSet;
use std::sync::Arc;
use std::time::Duration;
use arc_swap::ArcSwap;
use futures_util::stream::FuturesUnordered;
use helix_core::chars::char_is_word;
use helix_core::syntax::LanguageServerFeature;
use helix_event::{
cancelable_future, cancelation, register_hook, send_blocking, CancelRx, CancelTx,
};
use helix_lsp::lsp;
use helix_lsp::util::pos_to_lsp_pos;
use helix_stdx::rope::RopeSliceExt;
use helix_view::document::{Mode, SavePoint};
use helix_view::handlers::lsp::CompletionEvent;
use helix_view::{DocumentId, Editor, ViewId};
use tokio::sync::mpsc::Sender;
use tokio::time::Instant;
use tokio_stream::StreamExt;
use crate::commands;
use crate::compositor::Compositor;
use crate::config::Config;
use crate::events::{OnModeSwitch, PostCommand, PostInsertChar};
use crate::job::{dispatch, dispatch_blocking};
use crate::keymap::MappableCommand;
use crate::ui::editor::InsertEvent;
use crate::ui::lsp::SignatureHelp;
use crate::ui::{self, CompletionItem, Popup};
use super::Handlers;
#[derive(Debug, PartialEq, Eq, Clone, Copy)]
enum TriggerKind {
Auto,
TriggerChar,
Manual,
}
#[derive(Debug, Clone, Copy)]
struct Trigger {
pos: usize,
view: ViewId,
doc: DocumentId,
kind: TriggerKind,
}
#[derive(Debug)]
pub(super) struct CompletionHandler {
/// currently active trigger which will cause a
/// completion request after the timeout
trigger: Option<Trigger>,
/// A handle for currently active completion request.
/// This can be used to determine whether the current
/// request is still active (and new triggers should be
/// ignored) and can also be used to abort the current
/// request (by dropping the handle)
request: Option<CancelTx>,
config: Arc<ArcSwap<Config>>,
}
impl CompletionHandler {
pub fn new(config: Arc<ArcSwap<Config>>) -> CompletionHandler {
Self {
config,
request: None,
trigger: None,
}
}
}
impl helix_event::AsyncHook for CompletionHandler {
type Event = CompletionEvent;
fn handle_event(
&mut self,
event: Self::Event,
_old_timeout: Option<Instant>,
) -> Option<Instant> {
match event {
CompletionEvent::AutoTrigger {
cursor: trigger_pos,
doc,
view,
} => {
// techically it shouldn't be possible to switch views/documents in insert mode
// but people may create weird keymaps/use the mouse so lets be extra careful
if self
.trigger
.as_ref()
.map_or(true, |trigger| trigger.doc != doc || trigger.view != view)
{
self.trigger = Some(Trigger {
pos: trigger_pos,
view,
doc,
kind: TriggerKind::Auto,
});
}
}
CompletionEvent::TriggerChar { cursor, doc, view } => {
// immediately request completions and drop all auto completion requests
self.request = None;
self.trigger = Some(Trigger {
pos: cursor,
view,
doc,
kind: TriggerKind::TriggerChar,
});
}
CompletionEvent::ManualTrigger { cursor, doc, view } => {
// immediately request completions and drop all auto completion requests
self.request = None;
self.trigger = Some(Trigger {
pos: cursor,
view,
doc,
kind: TriggerKind::Manual,
});
// stop debouncing immediately and request the completion
self.finish_debounce();
return None;
}
CompletionEvent::Cancel => {
self.trigger = None;
self.request = None;
}
CompletionEvent::DeleteText { cursor } => {
// if we deleted the original trigger, abort the completion
if matches!(self.trigger, Some(Trigger{ pos, .. }) if cursor < pos) {
self.trigger = None;
self.request = None;
}
}
}
self.trigger.map(|trigger| {
// if the current request was closed forget about it
// otherwise immediately restart the completion request
let cancel = self.request.take().map_or(false, |req| !req.is_closed());
let timeout = if trigger.kind == TriggerKind::Auto && !cancel {
self.config.load().editor.completion_timeout
} else {
// we want almost instant completions for trigger chars
// and restarting completion requests. The small timeout here mainly
// serves to better handle cases where the completion handler
// may fall behind (so multiple events in the channel) and macros
Duration::from_millis(5)
};
Instant::now() + timeout
})
}
fn finish_debounce(&mut self) {
let trigger = self.trigger.take().expect("debounce always has a trigger");
let (tx, rx) = cancelation();
self.request = Some(tx);
dispatch_blocking(move |editor, compositor| {
request_completion(trigger, rx, editor, compositor)
});
}
}
fn request_completion(
mut trigger: Trigger,
cancel: CancelRx,
editor: &mut Editor,
compositor: &mut Compositor,
) {
let (view, doc) = current!(editor);
if compositor
.find::<ui::EditorView>()
.unwrap()
.completion
.is_some()
|| editor.mode != Mode::Insert
{
return;
}
let text = doc.text();
let cursor = doc.selection(view.id).primary().cursor(text.slice(..));
if trigger.view != view.id || trigger.doc != doc.id() || cursor < trigger.pos {
return;
}
// this looks odd... Why are we not using the trigger position from
// the `trigger` here? Won't that mean that the trigger char doesn't get
// send to the LS if we type fast enougn? Yes that is true but it's
// not actually a problem. The LSP will resolve the completion to the identifier
// anyway (in fact sending the later position is necessary to get the right results
// from LSPs that provide incomplete completion list). We rely on trigger offset
// and primary cursor matching for multi-cursor completions so this is definitely
// necessary from our side too.
trigger.pos = cursor;
let trigger_text = text.slice(..cursor);
let mut seen_language_servers = HashSet::new();
let mut futures: FuturesUnordered<_> = doc
.language_servers_with_feature(LanguageServerFeature::Completion)
.filter(|ls| seen_language_servers.insert(ls.id()))
.map(|ls| {
let language_server_id = ls.id();
let offset_encoding = ls.offset_encoding();
let pos = pos_to_lsp_pos(text, cursor, offset_encoding);
let doc_id = doc.identifier();
let context = if trigger.kind == TriggerKind::Manual {
lsp::CompletionContext {
trigger_kind: lsp::CompletionTriggerKind::INVOKED,
trigger_character: None,
}
} else {
let trigger_char =
ls.capabilities()
.completion_provider
.as_ref()
.and_then(|provider| {
provider
.trigger_characters
.as_deref()?
.iter()
.find(|&trigger| trigger_text.ends_with(trigger))
});
lsp::CompletionContext {
trigger_kind: lsp::CompletionTriggerKind::TRIGGER_CHARACTER,
trigger_character: trigger_char.cloned(),
}
};
let completion_response = ls.completion(doc_id, pos, None, context).unwrap();
async move {
let json = completion_response.await?;
let response: Option<lsp::CompletionResponse> = serde_json::from_value(json)?;
let items = match response {
Some(lsp::CompletionResponse::Array(items)) => items,
// TODO: do something with is_incomplete
Some(lsp::CompletionResponse::List(lsp::CompletionList {
is_incomplete: _is_incomplete,
items,
})) => items,
None => Vec::new(),
}
.into_iter()
.map(|item| CompletionItem {
item,
language_server_id,
resolved: false,
})
.collect();
anyhow::Ok(items)
}
})
.collect();
let future = async move {
let mut items = Vec::new();
while let Some(lsp_items) = futures.next().await {
match lsp_items {
Ok(mut lsp_items) => items.append(&mut lsp_items),
Err(err) => {
log::debug!("completion request failed: {err:?}");
}
};
}
items
};
let savepoint = doc.savepoint(view);
let ui = compositor.find::<ui::EditorView>().unwrap();
ui.last_insert.1.push(InsertEvent::RequestCompletion);
tokio::spawn(async move {
let items = cancelable_future(future, cancel).await.unwrap_or_default();
if items.is_empty() {
return;
}
dispatch(move |editor, compositor| {
show_completion(editor, compositor, items, trigger, savepoint)
})
.await
});
}
fn show_completion(
editor: &mut Editor,
compositor: &mut Compositor,
items: Vec<CompletionItem>,
trigger: Trigger,
savepoint: Arc<SavePoint>,
) {
let (view, doc) = current_ref!(editor);
// check if the completion request is stale.
//
// Completions are completed asynchronously and therefore the user could
//switch document/view or leave insert mode. In all of thoise cases the
// completion should be discarded
if editor.mode != Mode::Insert || view.id != trigger.view || doc.id() != trigger.doc {
return;
}
let size = compositor.size();
let ui = compositor.find::<ui::EditorView>().unwrap();
if ui.completion.is_some() {
return;
}
let completion_area = ui.set_completion(editor, savepoint, items, trigger.pos, size);
let signature_help_area = compositor
.find_id::<Popup<SignatureHelp>>(SignatureHelp::ID)
.map(|signature_help| signature_help.area(size, editor));
// Delete the signature help popup if they intersect.
if matches!((completion_area, signature_help_area),(Some(a), Some(b)) if a.intersects(b)) {
compositor.remove(SignatureHelp::ID);
}
}
pub fn trigger_auto_completion(
tx: &Sender<CompletionEvent>,
editor: &Editor,
trigger_char_only: bool,
) {
let config = editor.config.load();
if !config.auto_completion {
return;
}
let (view, doc): (&helix_view::View, &helix_view::Document) = current_ref!(editor);
let mut text = doc.text().slice(..);
let cursor = doc.selection(view.id).primary().cursor(text);
text = doc.text().slice(..cursor);
let is_trigger_char = doc
.language_servers_with_feature(LanguageServerFeature::Completion)
.any(|ls| {
matches!(&ls.capabilities().completion_provider, Some(lsp::CompletionOptions {
trigger_characters: Some(triggers),
..
}) if triggers.iter().any(|trigger| text.ends_with(trigger)))
});
if is_trigger_char {
send_blocking(
tx,
CompletionEvent::TriggerChar {
cursor,
doc: doc.id(),
view: view.id,
},
);
return;
}
let is_auto_trigger = !trigger_char_only
&& doc
.text()
.chars_at(cursor)
.reversed()
.take(config.completion_trigger_len as usize)
.all(char_is_word);
if is_auto_trigger {
send_blocking(
tx,
CompletionEvent::AutoTrigger {
cursor,
doc: doc.id(),
view: view.id,
},
);
}
}
fn update_completions(cx: &mut commands::Context, c: Option<char>) {
cx.callback.push(Box::new(move |compositor, cx| {
let editor_view = compositor.find::<ui::EditorView>().unwrap();
if let Some(completion) = &mut editor_view.completion {
completion.update_filter(c);
if completion.is_empty() {
editor_view.clear_completion(cx.editor);
// clearing completions might mean we want to immediately rerequest them (usually
// this occurs if typing a trigger char)
if c.is_some() {
trigger_auto_completion(&cx.editor.handlers.completions, cx.editor, false);
}
}
}
}))
}
fn clear_completions(cx: &mut commands::Context) {
cx.callback.push(Box::new(|compositor, cx| {
let editor_view = compositor.find::<ui::EditorView>().unwrap();
editor_view.clear_completion(cx.editor);
}))
}
fn completion_post_command_hook(
tx: &Sender<CompletionEvent>,
PostCommand { command, cx }: &mut PostCommand<'_, '_>,
) -> anyhow::Result<()> {
if cx.editor.mode == Mode::Insert {
if cx.editor.last_completion.is_some() {
match command {
MappableCommand::Static {
name: "delete_word_forward" | "delete_char_forward" | "completion",
..
} => (),
MappableCommand::Static {
name: "delete_char_backward",
..
} => update_completions(cx, None),
_ => clear_completions(cx),
}
} else {
let event = match command {
MappableCommand::Static {
name: "delete_char_backward" | "delete_word_forward" | "delete_char_forward",
..
} => {
let (view, doc) = current!(cx.editor);
let primary_cursor = doc
.selection(view.id)
.primary()
.cursor(doc.text().slice(..));
CompletionEvent::DeleteText {
cursor: primary_cursor,
}
}
// hacks: some commands are handeled elsewhere and we don't want to
// cancel in that case
MappableCommand::Static {
name: "completion" | "insert_mode" | "append_mode",
..
} => return Ok(()),
_ => CompletionEvent::Cancel,
};
send_blocking(tx, event);
}
}
Ok(())
}
pub(super) fn register_hooks(handlers: &Handlers) {
let tx = handlers.completions.clone();
register_hook!(move |event: &mut PostCommand<'_, '_>| completion_post_command_hook(&tx, event));
let tx = handlers.completions.clone();
register_hook!(move |event: &mut OnModeSwitch<'_, '_>| {
if event.old_mode == Mode::Insert {
send_blocking(&tx, CompletionEvent::Cancel);
clear_completions(event.cx);
} else if event.new_mode == Mode::Insert {
trigger_auto_completion(&tx, event.cx.editor, false)
}
Ok(())
});
let tx = handlers.completions.clone();
register_hook!(move |event: &mut PostInsertChar<'_, '_>| {
if event.cx.editor.last_completion.is_some() {
update_completions(event.cx, Some(event.c))
} else {
trigger_auto_completion(&tx, event.cx.editor, false);
}
Ok(())
});
}