summaryrefslogtreecommitdiff
path: root/ide-autocomplete.c
blob: c024e300c3ddf6c0bad2f0321477d7ea62a7ab55 (plain)
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
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
// auto-completion for ted

#include "ted.h"

#define TAGS_MAX_COMPLETIONS 200 // max # of tag completions to scroll through
#define AUTOCOMPLETE_NCOMPLETIONS_VISIBLE 10 // max # of completions to show at once

/// a single autocompletion suggestion
typedef struct Autocompletion Autocompletion;

struct Autocompletion {
	char *label;
	char *filter;
	char *text;
	/// this can be NULL!
	char *detail;
	/// this can be NULL!
	char *documentation;
	bool deprecated;
	SymbolKind kind; 
};

struct Autocomplete {
	/// is the autocomplete box open?
	bool open;
	/// should the completions array be updated when more characters are typed?
	bool is_list_complete;
	
	/// what trigger caused the last request for completions:
	/// either a character code (for trigger characters),
	/// or one of the `TRIGGER_*` constants above
	uint32_t trigger;
	
	LSPServerRequestID last_request;
	/// when we sent the request to the LSP for completions
	///  (this is used to figure out when we should display "Loading...")
	double last_request_time;
	
	/// dynamic array of all completions
	Autocompletion *completions;
	/// dynamic array of completions to be suggested (indices into completions)
	u32 *suggested;
	/// position of cursor last time completions were generated. if this changes, we need to recompute completions.
	BufferPos last_pos; 
	/// which completion is currently selected (index into suggested)
	i32 cursor;
	i32 scroll;
	
	/// was the last request for phantom completion?
	bool last_request_phantom;
	/// current phantom completion to be displayed
	char *phantom;
	/// rectangle where the autocomplete menu is (needed to avoid interpreting autocomplete clicks as other clicks)
	Rect rect;
};

void autocomplete_init(Ted *ted) {
	ted->autocomplete = calloc(1, sizeof *ted->autocomplete);
}

bool autocomplete_is_open(Ted *ted) {
	return ted->autocomplete->open;
}

bool autocomplete_has_phantom(Ted *ted) {
	return ted->autocomplete->phantom != NULL;

}

bool autocomplete_box_contains_point(Ted *ted, vec2 point) {
	return rect_contains_point(ted->autocomplete->rect, point);
}

static void autocomplete_clear_completions(Autocomplete *ac) {
	arr_foreach_ptr(ac->completions, Autocompletion, completion) {
		free(completion->label);
		free(completion->text);
		free(completion->filter);
		free(completion->detail);
		free(completion->documentation);
	}
	arr_clear(ac->completions);
	arr_clear(ac->suggested);
}

static void autocomplete_clear_phantom(Autocomplete *ac) {
	free(ac->phantom);
	ac->phantom = NULL;
}

// should a phantom completion be displayed?
static bool autocomplete_should_display_phantom(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	TextBuffer *buffer = ted->active_buffer;
	bool show = !ac->open
		&& buffer
		&& !buffer->view_only
		&& !buffer->is_line_buffer
		&& buffer_settings(buffer)->phantom_completions
		&& is32_word(buffer_char_before_cursor(buffer))
		&& !is32_word(buffer_char_at_cursor(buffer));
	if (!show)
		autocomplete_clear_phantom(ac);
	return show;
}

// do the actual completion
static void autocomplete_complete(Ted *ted, Autocompletion completion) {
	TextBuffer *buffer = ted->active_buffer;
	buffer_start_edit_chain(buffer); // don't merge with other edits
	if (is32_word(buffer_char_before_cursor(buffer)))
		buffer_backspace_words_at_cursor(buffer, 1); // delete whatever text was already typed
	buffer_insert_utf8_at_cursor(buffer, completion.text);
	buffer_end_edit_chain(buffer);
	autocomplete_close(ted);
}

void autocomplete_select_completion(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	if (ac->open) {
		size_t nsuggestions = arr_len(ac->suggested);
		if (nsuggestions) {
			i64 cursor = mod_i64(ac->cursor, (i64)nsuggestions);
			autocomplete_complete(ted, ac->completions[ac->suggested[cursor]]);
		}
	} else if (ac->phantom) {
		Autocompletion fake_completion = {
			.text = ac->phantom
		};
		autocomplete_complete(ted, fake_completion);
	}
}

static void autocomplete_correct_scroll(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	i32 scroll = ac->scroll;
	scroll = min_i32(scroll, (i32)arr_len(ac->suggested) - AUTOCOMPLETE_NCOMPLETIONS_VISIBLE);
	scroll = max_i32(scroll, 0);
	ac->scroll = scroll;
}

void autocomplete_scroll(Ted *ted, i32 by) {
	Autocomplete *ac = ted->autocomplete;
	ac->scroll += by;
	autocomplete_correct_scroll(ted);
}

static void autocomplete_move_cursor(Ted *ted, i32 by) {
	Autocomplete *ac = ted->autocomplete;
	u32 ncompletions = arr_len(ac->suggested);
	if (ncompletions == 0)
		return;
	i32 cursor = ac->cursor;
	cursor += by;
	cursor = (i32)mod_i32(cursor, (i32)ncompletions);
	ac->cursor = cursor;
	ac->scroll = ac->cursor - AUTOCOMPLETE_NCOMPLETIONS_VISIBLE / 2;
	autocomplete_correct_scroll(ted);
}

void autocomplete_next(Ted *ted) {
	autocomplete_move_cursor(ted, 1);
}

void autocomplete_prev(Ted *ted) {
	autocomplete_move_cursor(ted, -1);
}

void autocomplete_close(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	ac->open = false;
	autocomplete_clear_phantom(ac);
	autocomplete_clear_completions(ac);
	ted_cancel_lsp_request(ted, &ac->last_request);
}

static void autocomplete_update_suggested(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	arr_clear(ac->suggested);
	char *word = buffer_word_at_cursor_utf8(ted->active_buffer);
	for (u32 i = 0; i < arr_len(ac->completions); ++i) {
		Autocompletion *completion = &ac->completions[i];
		if (str_has_prefix(completion->filter, word))
			arr_add(ac->suggested, i); // suggest this one
	}
	free(word);
}

static bool autocomplete_using_lsp(Ted *ted) {
	return ted->active_buffer && buffer_lsp(ted->active_buffer) != NULL;
}

static void autocomplete_no_suggestions(Ted *ted) {
	Autocomplete *ac = ted->autocomplete;
	if (ac->trigger == TRIGGER_INVOKED)
		ted_flash_error_cursor(ted);
	autocomplete_close(ted);
}

static void autocomplete_send_completion_request(Ted *ted, TextBuffer *buffer, BufferPos pos, uint32_t trigger, bool phantom) {
	if (!buffer->path)
		return; // no can do
	
	LSP *lsp = buffer_lsp(buffer);
	Autocomplete *ac = ted->autocomplete;

	ted_cancel_lsp_request(ted, &ac->last_request);

	LSPRequest request = {
		.type = LSP_REQUEST_COMPLETION
	};
	
	LSPCompletionTriggerKind lsp_trigger = LSP_TRIGGER_CHARACTER;
	switch (trigger) {
	case TRIGGER_INVOKED: lsp_trigger = LSP_TRIGGER_INVOKED; break;
	case TRIGGER_INCOMPLETE: lsp_trigger = LSP_TRIGGER_INCOMPLETE; break;
	}
	
	request.data.completion = (LSPRequestCompletion) {
		.position = {
			.document = lsp_document_id(lsp, buffer->path),
			.pos = buffer_pos_to_lsp_position(buffer, pos)
		},
		.context = {
			.trigger_kind = lsp_trigger,
			.trigger_character = {0},
		}
	};
	if (trigger < UNICODE_CODE_POINTS)
		unicode_utf32_to_utf8(request.data.completion.context.trigger_character, trigger);
	ac->last_request = lsp_send_request(lsp, &request);
	if (ac->last_request.id) {
		ac->last_request_time = ted->frame_time;
		ac->last_request_phantom = phantom;
		// *technically sepaking* this can mess things up if a complete
		// list arrives only after the user has typed some stuff
		// (in that case we'll send a TriggerKind = incomplete request even though it makes no sense).
		// but i don't think any servers will have a problem with that.
		ac->is_list_complete = false;
	}
}

static void autocomplete_find_completions(Ted *ted, uint32_t trigger, bool phantom) {
	Autocomplete *ac = ted->autocomplete;
	TextBuffer *buffer = ted->active_buffer;
	if (!buffer)
		return;
	BufferPos pos = buffer->cursor_pos;
	if (buffer_pos_eq(pos, ac->last_pos))
		return; // no need to update completions.
	ac->trigger = trigger;
	ac->last_pos = pos;

	LSP *lsp = buffer_lsp(buffer);
	if (lsp) {
		if (ac->is_list_complete && trigger == TRIGGER_INCOMPLETE) {
			// the list of completions we got from the LSP server is complete,
			// so we just need to call autocomplete_update_suggested,
			// we don't need to send a new request.
		} else {
			autocomplete_send_completion_request(ted, buffer, pos, trigger, phantom);
		}
	} else {
		// tag completion
		autocomplete_clear_completions(ac);
		autocomplete_clear_phantom(ac);
		
		char *word_at_cursor = str32_to_utf8_cstr(buffer_word_at_cursor(buffer));
		if (phantom) {
			if (autocomplete_should_display_phantom(ted)) {
				char *completions[2] = {NULL, NULL};
				if (tags_beginning_with(ted, word_at_cursor, completions, 2, false) == 1) {
					// show phantom
					ac->phantom = completions[0];
					free(completions[1]);
				} else {
					free(completions[0]);
					free(completions[1]);
				}
			}
		} else {
			char **completions = calloc(TAGS_MAX_COMPLETIONS, sizeof *completions);
			u32 ncompletions = (u32)tags_beginning_with(ted, word_at_cursor, completions, TAGS_MAX_COMPLETIONS, true);
			
			arr_set_len(ac->completions, ncompletions);
			
			for (size_t i = 0; i < ncompletions; ++i) {
				ac->completions[i].label = completions[i];
				ac->completions[i].text = str_dup(completions[i]);
				ac->completions[i].filter = str_dup(completions[i]);
				arr_add(ac->suggested, (u32)i);
			}
			free(completions);
			
			// if we got the full list of tags beginning with `word_at_cursor`,
			// then we don't need to call `tags_beginning_with` again.
			ac->is_list_complete = ncompletions == TAGS_MAX_COMPLETIONS;
		}
		free(word_at_cursor);
	}
	
	autocomplete_update_suggested(ted);
}

static SymbolKind lsp_completion_kind_to_ted(LSPCompletionKind kind) {
	switch (kind) {
	case LSP_COMPLETION_TEXT:
	case LSP_COMPLETION_MODULE:
	case LSP_COMPLETION_UNIT:
	case LSP_COMPLETION_COLOR:
	case LSP_COMPLETION_FILE:
	case LSP_COMPLETION_REFERENCE:
	case LSP_COMPLETION_FOLDER:
	case LSP_COMPLETION_OPERATOR:
		return SYMBOL_OTHER;
	
	case LSP_COMPLETION_METHOD:
	case LSP_COMPLETION_FUNCTION:
	case LSP_COMPLETION_CONSTRUCTOR:
		return SYMBOL_FUNCTION;
	
	case LSP_COMPLETION_FIELD:
	case LSP_COMPLETION_PROPERTY:
		return SYMBOL_FIELD;
	
	case LSP_COMPLETION_VARIABLE:
		return SYMBOL_VARIABLE;
	
	case LSP_COMPLETION_CLASS:
	case LSP_COMPLETION_INTERFACE:
	case LSP_COMPLETION_ENUM:
	case LSP_COMPLETION_STRUCT:
	case LSP_COMPLETION_EVENT:
	case LSP_COMPLETION_TYPEPARAMETER:
		return SYMBOL_TYPE;
	
	case LSP_COMPLETION_VALUE:
	case LSP_COMPLETION_ENUMMEMBER:
	case LSP_COMPLETION_CONSTANT:
		return SYMBOL_CONSTANT;
	
	case LSP_COMPLETION_KEYWORD:
	case LSP_COMPLETION_SNIPPET:
		return SYMBOL_KEYWORD;
	}
	assert(0);
	return SYMBOL_OTHER;
}


void autocomplete_process_lsp_response(Ted *ted, const LSPResponse *response) {
	const LSPRequest *request = &response->request;
	if (request->type != LSP_REQUEST_COMPLETION)
		return;
	Autocomplete *ac = ted->autocomplete;
	if (request->id != ac->last_request.id)
		return; // old request
	ac->last_request.id = 0;
	if (!ac->open && !ac->last_request_phantom) {
		// user hit escape or down or something before completions arrived.
		return;
	}
	if (ac->open && ac->last_request_phantom) {
		// shouldn't be possible, since we should never request phantom completions while autocomplete is open
		assert(0);
		return;
	}
		
	TextBuffer *buffer = ted->active_buffer;
	if (!buffer)
		return;
	
	const LSPResponseCompletion *completion = &response->data.completion;
	size_t ncompletions = arr_len(completion->items);
	if (ac->last_request_phantom) {
		if (!autocomplete_should_display_phantom(ted))
			return;
		
		// check for phantom completion
		// ideally we would just check if ncompletions == 1,
		// but some completions might not start with the word at the cursor,
		// and it's best to filter those out.
		char *word_at_cursor = buffer_word_at_cursor_utf8(buffer);
		if (*word_at_cursor) {
			int ncandidates = 0;
			const char *candidate = NULL;
			for (size_t i = 0; i < ncompletions; ++i) {
				const LSPCompletionItem *lsp_completion = &completion->items[i];
				const char *new_text = lsp_response_string(response, lsp_completion->text_edit.new_text);
				if (str_has_prefix(new_text, word_at_cursor) && (
					// ignore completions with duplicate text
					!candidate || !streq(candidate, new_text)
					)) {
					candidate = new_text;
					++ncandidates;
					if (ncandidates >= 2) break;
				}
			}
			
			// only show phantom if there is exactly 1 possible completion.
			if (ncandidates == 1) {
				ac->phantom = str_dup(candidate);
			} else {
				autocomplete_clear_phantom(ac);
			}
		}
		free(word_at_cursor);
		return;
	}
	
	autocomplete_clear_completions(ac);
	arr_set_len(ac->completions, ncompletions);
	for (size_t i = 0; i < ncompletions; ++i) {
		const LSPCompletionItem *lsp_completion = &completion->items[i];
		Autocompletion *ted_completion = &ac->completions[i];
		ted_completion->label = str_dup(lsp_response_string(response, lsp_completion->label));
		ted_completion->filter = str_dup(lsp_response_string(response, lsp_completion->filter_text));
		// NOTE: here we don't deal with snippets.
		// right now we are sending "snippetSupport: false" in the capabilities,
		// so this should be okay.
		ted_completion->text = str_dup(lsp_response_string(response, lsp_completion->text_edit.new_text));
		const char *detail = lsp_response_string(response, lsp_completion->detail);
		ted_completion->detail = *detail ? str_dup(detail) : NULL;
		ted_completion->kind = lsp_completion_kind_to_ted(lsp_completion->kind);
		ted_completion->deprecated = lsp_completion->deprecated;
		const char *documentation = lsp_response_string(response, lsp_completion->documentation);
		ted_completion->documentation = *documentation ? str_dup(documentation) : NULL;
		
	}
	if (ac->last_request_phantom) {
		assert(ncompletions == 1);
		ac->phantom = str_dup(ac->completions[0].text);
		autocomplete_clear_completions(ac);
		return;
	}
	
	ac->is_list_complete = completion->is_complete;
	
	autocomplete_update_suggested(ted);
	switch (arr_len(ac->suggested)) {
	case 0:
		autocomplete_no_suggestions(ted);
		return;
	case 1:
		// if autocomplete was invoked by Ctrl+Space, and there's only one completion, select it.
		if (ac->trigger == TRIGGER_INVOKED)
			autocomplete_complete(ted, ac->completions[ac->suggested[0]]);
		return;	
	}
}

void autocomplete_open(Ted *ted, uint32_t trigger) {
	Autocomplete *ac = ted->autocomplete;
	if (ac->open) return;
	TextBuffer *buffer = ted->active_buffer;
	if (!buffer) return;
	if (!buffer->path) return;
	if (buffer->view_only) return;
	autocomplete_clear_phantom(ac);
	const Settings *settings = buffer_settings(buffer);
	bool regenerated = false;
	
	find_completions:
	ted->cursor_error_time = 0;
	ac->last_pos = (BufferPos){U32_MAX,0};
	ac->cursor = 0;
	autocomplete_find_completions(ted, trigger, false);
	
	
	if (arr_len(ac->completions) == 0) {
		if (autocomplete_using_lsp(ted)) {
			ac->open = true;
		} else if (settings->regenerate_tags_if_not_found && !regenerated) {
			regenerated = true;
			tags_generate(ted, false);
			goto find_completions;
		} else { 
			autocomplete_no_suggestions(ted);
		}
		return;
	}
	
	bool multiple_completions = false;
	for (u32 i = 1; i < arr_len(ac->completions); ++i) {
		if (!streq(ac->completions[i].text, ac->completions[0].text)) {
			multiple_completions = true;
			break;
		}
	}
	
	if (!multiple_completions) {
		autocomplete_complete(ted, ac->completions[0]);
		// (^ this calls autocomplete_close)
		return;
	}
	
	// open autocomplete menu
	ac->open = true;
}

static void autocomplete_find_phantom(Ted *ted) {
	if (!autocomplete_should_display_phantom(ted))
		return;
	autocomplete_find_completions(ted, TRIGGER_INVOKED, true);
}

static char symbol_kind_icon(SymbolKind k) {
	switch (k) {
	case SYMBOL_FUNCTION:
		return 'f';
	case SYMBOL_FIELD:
		return 'm';
	case SYMBOL_TYPE:
		return 't';
	case SYMBOL_CONSTANT:
		return 'c';
	case SYMBOL_VARIABLE:
		return 'v';
	case SYMBOL_KEYWORD:
	case SYMBOL_OTHER:
		return ' ';
	}
	assert(0);
	return ' ';
}

void autocomplete_frame(Ted *ted) {
	TextBuffer *buffer = ted->active_buffer;
	if (!buffer) return;
	Font *font = ted->font;
	float char_height = text_font_char_height(font);
	const Settings *settings = buffer_settings(buffer);
	const u32 *colors = settings->colors;
	const float padding = settings->padding;
	
	autocomplete_find_phantom(ted);
	
	Autocomplete *ac = ted->autocomplete;
	if (autocomplete_should_display_phantom(ted) && ac->phantom) {
		// display phantom completion
		char *word_at_cursor = buffer_word_at_cursor_utf8(buffer);
		if (*word_at_cursor && str_has_prefix(ac->phantom, word_at_cursor)) {
			const char *completion = ac->phantom + strlen(word_at_cursor);
			if (*completion) {
				vec2 pos = buffer_pos_to_pixels(buffer, buffer->cursor_pos);
				#if 0
				vec2 size = text_get_size_vec2(font, completion);
				// this makes the text below the phantom less visible.
				// doesn't look very good, so I'm not doing it.
				Rect r = rect(pos, size);
				u32 bg_color = color_apply_opacity(color_blend(colors[COLOR_BG], colors[COLOR_CURSOR_LINE_BG]), 0.8f);
				gl_geometry_rect(r, bg_color);
				#endif
				u32 text_color = color_apply_opacity(colors[COLOR_TEXT], 0.5);
				text_utf8(font, completion, pos.x, pos.y, text_color);
				gl_geometry_draw();
				text_render(font);
			} else {
				// this phantom is no longer relevant
				autocomplete_clear_phantom(ac);
			}
		} else {
			// this phantom is no longer relevant
			autocomplete_clear_phantom(ac);
		}
		free(word_at_cursor);
		return;
	}
	if (!ac->open)
		return;

	autocomplete_find_completions(ted, TRIGGER_INCOMPLETE, false);
	
	size_t ncompletions = arr_len(ac->suggested);
	bool waiting_for_lsp = ac->last_request.id != 0;
	
	if (waiting_for_lsp && ncompletions == 0) {
		double now = ted->frame_time;
		if (now - ac->last_request_time < 0.2) {
			// don't show "Loading..." unless we've actually been loading for a bit of time
			return;
		}
	}
	
	if (!waiting_for_lsp && ncompletions == 0) {
		// no completions. close menu.
		autocomplete_close(ted);
		return;
	}
	
	ac->cursor = ncompletions ? (i32)mod_i64(ac->cursor, (i64)ncompletions) : 0;
	
	autocomplete_correct_scroll(ted);
	i32 scroll = ac->scroll;
	u32 ncompletions_visible = min_u32((u32)ncompletions, AUTOCOMPLETE_NCOMPLETIONS_VISIBLE);
	
	float menu_width = 400, menu_height = (float)ncompletions_visible * char_height;
	
	if (waiting_for_lsp && ncompletions == 0) {
		menu_height = 200.f;
	}
	
	vec2 cursor_pos = buffer_pos_to_pixels(buffer, buffer->cursor_pos);
	bool open_up = cursor_pos.y > 0.5f * (buffer->y1 + buffer->y2); // should the completion menu open upwards?
	bool open_left = cursor_pos.x > 0.5f * (buffer->x1 + buffer->x2);
	float x = cursor_pos.x, start_y = cursor_pos.y;
	if (open_left) x -= menu_width;
	if (open_up)
		start_y -= menu_height;
	else
		start_y += char_height; // put menu below cursor
	{
		Rect menu_rect = rect(Vec2(x, start_y), Vec2(menu_width, menu_height));
		gl_geometry_rect(menu_rect, colors[COLOR_AUTOCOMPLETE_BG]);
		gl_geometry_rect_border(menu_rect, 1, colors[COLOR_AUTOCOMPLETE_BORDER]);
		ac->rect = menu_rect;
	}
	
	i32 mouse_entry = scroll + (i32)((ted->mouse_pos.y - start_y) / char_height);
	
	Autocompletion *document = NULL;
	if (ncompletions) {
		assert(ac->cursor >= 0 && ac->cursor < (i32)ncompletions);
		// highlight cursor entry
		Rect r = rect(Vec2(x, start_y + (float)(ac->cursor - scroll) * char_height), Vec2(menu_width, char_height));
		if (rect_contains_point(ac->rect, rect_center(r))) {
			gl_geometry_rect(r, colors[COLOR_AUTOCOMPLETE_HL]);
			document = &ac->completions[ac->suggested[ac->cursor]];
		}
	}
	if (mouse_entry >= 0 && mouse_entry < (i32)ncompletions
		&& rect_contains_point(ac->rect, ted->mouse_pos)) {
		// highlight moused over entry
		Rect r = rect(Vec2(x, start_y + (float)(mouse_entry - scroll) * char_height), Vec2(menu_width, char_height));
		gl_geometry_rect(r, colors[COLOR_AUTOCOMPLETE_HL]);
		ted->cursor = ted->cursor_hand;
		document = &ac->completions[ac->suggested[mouse_entry]];
	}
	
	float border_thickness = settings->border_thickness;
	
	
	if (document && document->documentation) {
		// document that entry!!
		
		// we've got some wacky calculations to figure out the
		// bounding rect for the documentation
		float doc_width = open_left ? ac->rect.pos.x - 2*padding
			: buffer->x2 - (ac->rect.pos.x + ac->rect.size.x + 2*padding);
		if (doc_width > 800) doc_width = 800;
		float doc_height = buffer->y2 - (ac->rect.pos.y + 2*padding);
		if (doc_height > char_height * 20) doc_height = char_height * 20;
		
		// if the rect is too small, there's no point in showing it
		if (doc_width >= 200) {
			float doc_x = open_left ? ac->rect.pos.x - doc_width - padding
				: ac->rect.pos.x + ac->rect.size.x + padding;
			float doc_y = ac->rect.pos.y;
			Rect r = rect(Vec2(doc_x, doc_y), Vec2(doc_width, doc_height));
			gl_geometry_rect(r, colors[COLOR_AUTOCOMPLETE_BG]);
			gl_geometry_rect_border(r, border_thickness, colors[COLOR_AUTOCOMPLETE_BORDER]);
			
			// draw the text!
			TextRenderState text_state = text_render_state_default;
			text_state.min_x = doc_x + padding;
			text_state.max_x = doc_x + doc_width - padding;
			text_state.max_y = doc_y + doc_height;
			text_state.x = doc_x + padding;
			text_state.y = doc_y + padding;
			text_state.wrap = true;
			rgba_u32_to_floats(colors[COLOR_TEXT], text_state.color);
			text_utf8_with_state(font, &text_state, document->documentation);
		}
	}
		
	arr_foreach_ptr(ted->mouse_clicks[SDL_BUTTON_LEFT], MouseClick, click) {
		vec2 pos = click->pos;
		if (rect_contains_point(ac->rect, pos)) {
			i32 entry = scroll + (i32)((pos.y - start_y) / char_height);
			if (entry >= 0 && entry < (i32)ncompletions) {
				// entry was clicked on! use this completion.
				autocomplete_complete(ted, ac->completions[ac->suggested[entry]]);
				return;
			}
		}
	}
	
	float y = start_y;
	TextRenderState state = text_render_state_default;
	state.min_x = x + padding; state.min_y = y; state.max_x = x + menu_width - padding; state.max_y = y + menu_height;
	rgba_u32_to_floats(colors[COLOR_TEXT], state.color);
	
	if (waiting_for_lsp && ncompletions == 0) {
		state.x = x + padding; state.y = y;
		text_utf8_with_state(font, &state, "Loading...");
	} else {
		for (size_t i = 0; i < ncompletions_visible; ++i) {
			const Autocompletion *completion = &ac->completions[ac->suggested[(i32)i + scroll]];
			
			state.x = x; state.y = y;
			if (i != ncompletions_visible-1) {
				gl_geometry_rect(rect(Vec2(x, y + char_height),
					Vec2(menu_width, border_thickness)),
					colors[COLOR_AUTOCOMPLETE_BORDER]);
			}
			
			ColorSetting label_color = color_for_symbol_kind(completion->kind);
			if (!settings->syntax_highlighting)
				label_color = COLOR_TEXT;
			
			rgba_u32_to_floats(colors[label_color], state.color);
			
			// draw icon
			char icon_text[2] = {symbol_kind_icon(completion->kind), 0};
			state.x += padding;
			text_utf8_with_state(font, &state, icon_text);
			state.x += padding;
			gl_geometry_rect(rect(Vec2((float)state.x, (float)state.y), Vec2(border_thickness, char_height)),
				colors[COLOR_AUTOCOMPLETE_BORDER]);
			state.x += padding;
			
			float label_x = (float)state.x;
			text_utf8_with_state(font, &state, completion->label);
			
			const char *detail = completion->detail;
			if (detail) {
				// draw detail
				double label_end_x = state.x;
				
				char show_text[128] = {0};
				
				int amount_detail = 0;
				for (; ; ++amount_detail) {
					if (unicode_is_continuation_byte((u8)detail[amount_detail]))
						continue; // don't cut off text in the middle of a code point.
					
					char text[128] = {0};
					strbuf_printf(text, "%.*s%s", amount_detail, detail,
						(size_t)amount_detail == strlen(detail) ? "" : "...");
					double width = text_get_size_vec2(font, text).x;
					if (label_end_x + width + 2 * padding < state.max_x) {
						strbuf_cpy(show_text, text);
					}
					// don't break if not, since we want to use "blabla"
					//  even if "blabl..." is too long
					
					if (!detail[amount_detail]) break;
				}
				if (amount_detail >= 3) {
					text_utf8_anchored(font, show_text, state.max_x, state.y,
						colors[COLOR_COMMENT], ANCHOR_TOP_RIGHT);
				}
			}
			
			if (completion->deprecated) {
				gl_geometry_rect(rect(Vec2(label_x, y + (char_height - border_thickness) * 0.5f),
					Vec2((float)state.x - label_x, 1)),
					colors[label_color]);
			}
			
			y += char_height;
		}
	}
	
	gl_geometry_draw();
	text_render(font);
}