Repository navigation
Expand file tree
/
Copy pathindentscope.lua
More file actions
1199 lines (1061 loc) · 46.2 KB
/
Copy pathindentscope.lua
File metadata and controls
1199 lines (1061 loc) · 46.2 KB
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
53
F438
4
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
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
-- MIT License Copyright (c) 2022 Evgeni Chasnovski
-- Documentation ==============================================================
--- Visualize and operate on indent scope
---
--- Indent scope (or just "scope") is a maximum set of consecutive lines which
--- contains certain reference line (cursor line by default) and every member
--- has indent not less than certain reference indent ("indent at cursor" by
--- default: minimum between cursor column and indent of cursor line).
---
--- Features:
--- - Visualize scope with vertical line. It is very fast and done
--- automatically in a non-blocking way (other operations can be performed,
--- like moving cursor). You can customize debounce delay and animation rule.
--- - Customization of scope computation options can be done on global level
--- (in |MiniIndentscope.config|), for a certain buffer (using
--- `vim.b.miniindentscope_options` buffer variable), or within a call (using
--- `opts` variable in |MiniIndentscope.get_scope|).
--- - Customizable notion of a border: which adjacent lines with strictly lower
--- indent are recognized as such. This is useful for a certain filetypes
--- (for example, Python or plain text).
--- - Customizable way of line to be considered "border first". This is useful
--- if you want to place cursor on function header and get scope of its body.
--- - There are textobjects and motions to operate on scope. Support |count|
--- and dot-repeat (in operator pending mode).
---
--- # Setup~
---
--- This module needs a setup with `require('mini.indentscope').setup({})`
--- (replace `{}` with your `config` table). It will create global Lua table
--- `MiniIndentscope` which you can use for scripting or manually (with `:lua
--- MiniIndentscope.*`). See |MiniIndentscope.config| for available config
--- settings.
---
--- # Comparisons~
---
--- - 'lukas-reineke/indent-blankline.nvim':
--- - Its main functionality is about showing static guides of indent levels.
--- - Implementation of 'mini.indentscope' is similar to
--- 'indent-blankline.nvim' (using |extmarks| on first column to be shown
--- even on blank lines). They can be used simultaneously, but it will
--- lead to one of the visualizations being on top (hiding) of another.
---
--- # Highlight groups~
---
--- * `MiniIndentscopeSymbol` - symbol showing on every line of scope.
--- * `MiniIndentscopePrefix` - space before symbol. By default made so as to
--- appear as nothing
8000
is displayed.
---
--- To change any highlight group, modify it directly with |:highlight|.
---
--- # Disabling~
---
--- To disable autodrawing, set `g:miniindentscope_disable` (globally) or
--- `b:miniindentscope_disable` (for a buffer) to `v:true`. Considering high
--- number of different scenarios and customization intentions, writing exact
--- rules for disabling module's functionality is left to user. See
--- |mini.nvim-disabling-recipes| for common recipes.
---@tag mini.indentscope
---@tag MiniIndentscope
---@toc_entry Visualize and operate on indent scope
--- Drawing of scope indicator
---
--- Draw of scope indicator is done as iterative animation. It has the
--- following design:
--- - Draw indicator on origin line (where cursor is at) immediately. Indicator
--- is visualized as `MiniIndentscope.config.symbol` placed to the right of
--- scope's border indent. This creates a line from top to bottom scope edges.
--- - Draw upward and downward concurrently per one line. Progression by one
--- line in both direction is considered to be one step of animation.
--- - Before each step wait certain amount of time, which is decided by
--- "animation function". It takes next and total step numbers (both are one
--- or bigger) and returns number of milliseconds to wait before drawing next
--- step. Comparing to a more popular "easing functions" in animation (input:
--- duration since animation start; output: percent of animation done), it is
--- a discrete inverse version of its derivative. Such interface proved to be
--- more appropriate for kind of task at hand.
---
--- Special cases~
---
--- - When scope to be drawn intersects (same indent, ranges overlap) currently
--- visible one (at process or finished drawing), drawing is done immediately
--- without animation. With most common example being typing new text, this
--- feels more natural.
--- - Scope for the whole buffer is not drawn as it is isually redundant.
--- Technically, it can be thought as drawn at column 0 (because border
--- indent is -1) which is not visible.
---@tag MiniIndentscope-drawing
-- Notes about implementation:
-- - Tried and rejected features/optimizations:
-- - Gap at cursor. Intended to always show cursor at normal state. It
-- might be more visually pleasing and more convenient when start typing
-- over indicator. Couldn't properly do that because couldn't find an
-- appropriate (fast, non-blocking, without much code complexity,
-- low-flickering) way to do that. There was an idea of making draw
-- function not draw at cursor and update only cursor gap when it was
-- enough, but there was slight flickering and too much code complexity.
-- - Draw only inside current window view (from top visible line to bottom
-- one). Would decrease workload. Couldn't properly do that because there
-- is early screen redraw after `WinScrolled` which introduced flickering
-- when scrolling (so it was `WinScrolled` -> redraw with current
-- extmarks -> redraw with new extmarks).
-- - Manual tests to check proper drawing (not sure how to autotest this):
-- - Moving cursor faster than debounce delay should not initiate drawing.
-- - Extmark on cursor line should show right after debounce delay. Other
-- steps (if present) should use animation function.
-- - Usual typing on new line without decreasing indent should immediately
-- update scope without animation (although it is a different scope).
-- - Moving cursor within same scope when it is already drawing shouldn't
-- stop drawing.
-- - Fast consecutive scrolling within big scope (try `<C-d>` and `<Down>`)
-- shouldn't cause flicker.
-- - Manual tests for textobjects and motions:
-- - Dot-repeat in operator-pending mode should work (like `dii` or `d[i`
-- and then `.` in other place).
-- - Different options should be properly handled (like using body line
-- when border line is not present).
-- Module definition ==========================================================
local MiniIndentscope = {}
local H = {}
--- Module setup
---
---@param config table Module config table. See |MiniIndentscope.config|.
---
---@usage `require('mini.indentscope').setup({})` (replace `{}` with your `config` table)
function MiniIndentscope.setup(config)
-- Export module
_G.MiniIndentscope = MiniIndentscope
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
-- Module behavior
vim.api.nvim_exec(
[[augroup MiniIndentscope
au!
au CursorMoved,CursorMovedI * lua MiniIndentscope.auto_draw({ lazy = true })
au TextChanged,TextChangedI,TextChangedP,WinScrolled * lua MiniIndentscope.auto_draw()
augroup END]],
false
)
if vim.fn.exists('##ModeChanged') == 1 then
vim.api.nvim_exec(
-- Call `auto_draw` on mode change to respect `miniindentscope_disable`
[[augroup MiniIndentscope
au ModeChanged *:* lua MiniIndentscope.auto_draw({ lazy = true })
augroup END]],
false
)
end
-- Create highlighting
vim.api.nvim_exec(
[[hi default link MiniIndentscopeSymbol Delimiter
hi MiniIndentscopePrefix guifg=NONE guibg=NONE gui=nocombine]],
false
)
end
--- Module config
---
--- Default values:
---@eval return MiniDoc.afterlines_to_code(MiniDoc.current.eval_
8000
section)
---@text # Options ~
---
--- - Options can be supplied globally (from this `config`), locally to buffer
--- (via `vim.b.miniindentscope_options` buffer variable), or locally to call
--- (as argument to |MiniIndentscope.get_scope()|).
---
--- - Option `border` controls which line(s) with smaller indent to categorize
--- as border. This matters for textobjects and motions.
--- It also controls how empty lines are treated: they are included in scope
--- only if followed by a border. Another way of looking at it is that indent
--- of blank line is computed based on value of `border` option.
--- Here is an illustration of how `border` works in presense of empty lines:
--- >
--- |both|bottom|top|none|
--- 1|function foo() | 0 | 0 | 0 | 0 |
--- 2| | 4 | 0 | 4 | 0 |
--- 3| print('Hello world') | 4 | 4 | 4 | 4 |
--- 4| | 4 | 4 | 2 | 2 |
--- 5| end | 2 | 2 | 2 | 2 |
--- <
--- Numbers inside a table are indent values of a line computed with certain
--- value of `border`. So, for example, a scope with reference line 3 and
--- right-most column has body range depending on value of `border` option:
--- - `border` is "both": range is 2-4, border is 1 and 5 with indent 2.
--- - `border` is "top": range is 2-3, border is 1 with indent 0.
--- - `border` is "bottom": range is 3-4, border is 5 with indent 0.
--- - `border` is "none": range is 3-3, border is empty with indent `nil`.
---
--- - Option `indent_at_cursor` controls if cursor position should affect
--- computation of scope. If `true`, reference indent is a minimum of
--- reference line's indent and cursor column. In main example, here how
--- scope's body range differs depending on cursor column and `indent_at_cursor`
--- value (assuming cursor is on line 3 and it is whole buffer):
--- >
--- Column\Option true|false
--- 1 and 2 2-5 | 2-4
--- 3 and more 2-4 | 2-4
--- <
--- - Option `try_as_border` controls how to act when input line can be
--- recognized as a border of some neighbor indent scope. In main example,
--- when input line is 1 and can be recognized as border for inner scope,
--- value `try_as_border = true` means that inner scope will be returned.
--- Similar, for input line 5 inner scope will be returned if it is
--- recognized as border.
MiniIndentscope.config = {
draw = {
-- Delay (in ms) between event and start of drawing scope indicator
delay = 100,
-- Animation rule for scope's first drawing. A function which, given next
-- and total step numbers, returns wait time (in ms). See
-- |MiniIndentscope.gen_animation()| for builtin options. To not use
-- animation, supply `require('mini.indentscope').gen_animation('none')`.
--minidoc_replace_start animation = --<function: implements constant 20ms between steps>,
animation = function(s, n)
return 20
end,
--minidoc_replace_end
},
-- Module mappings. Use `''` (empty string) to disable one.
mappings = {
-- Textobjects
object_scope = 'ii',
object_scope_with_border = 'ai',
-- Motions (jump to respective border line; if not present - body line)
goto_top = '[i',
goto_bottom = ']i',
},
-- Options which control computation of scope. Buffer local values can be
-- supplied in buffer variable `vim.b.miniindentscope_options`.
options = {
-- Type of scope's border: which line(s) with smaller indent to
-- categorize as border. Can be one of: 'both', 'top', 'bottom', 'none'.
border = 'both',
-- Whether to use cursor column when computing reference indent. Useful to
-- see incremental scopes with horizontal cursor movements.
indent_at_cursor = true,
-- Whether to first check input line to be a border of adjacent scope.
-- Use it if you want to place cursor on function header to get scope of
-- its body.
try_as_border = false,
},
-- Which character to use for drawing scope indicator
symbol = '╎',
}
--minidoc_afterlines_end
-- Module functionality =======================================================
--- Compute indent scope
---
--- Indent scope (or just "scope") is a maximum set of consecutive lines which
--- contains certain reference line (cursor line by default) and every member
--- has indent not less than certain reference indent ("indent at column" by
--- default). Here "indent at column" means minimum between input column value
--- and indent of reference line. When using cursor column, this allows for a
--- useful interactive view of nested indent scopes by making horizontal
--- movements within line.
---
--- Options controlling actual computation is taken from these places in order:
--- - Argument `opts`. Use it to ensure independence from other sources.
--- - Buffer local variable `vim.b.miniindentscope_options`. Useful to define
--- behavior inside some autocommand (for example, for a certain filetype).
--- - Global options from |MiniIndentscope.config|.
---
--- Algorithm overview~
---
--- - Compute reference "indent at column". Reference line is an input `line`
--- which might be modified to one of its neighbors if `try_as_border` option
--- is `true`: if it can be viewed as border of some neighbor scope, it will.
--- - Process upwards and downwards from reference line to search for line with
--- indent strictly less than reference one. This is like casting rays up and
--- down from reference line and reference indent until meeting "a wall"
--- (character to the right of indent or buffer edge). Latest line before
--- meeting is a respective end of scope body. It always exists because
--- reference line is a such one.
--- - Based on top and bottom lines with strictly lower indent, construct
--- scopes's border. The way it is computed is decided based on `border`
--- option (see |MiniIndentscope.config| for more information).
--- - Compute border indent as maximum indent of border lines (or reference
--- indent minus one in case of no border). This is used during drawing
--- visual indicator.
---
--- Indent computation~
---
--- For every line indent is intended to be computed unambiguously:
--- - For "normal" lines indent is an output of |indent()|.
--- - Indent is `-1` for imaginary lines 0 and past last line.
--- - For blank and empty lines indent is computed based on previous
--- (|prevnonblank()|) and next (|nextnonblank()|) non-blank lines. The way
--- it is computed is decided based on `border` in order to not include blank
--- lines at edge of scope's body if there is no border there. See
--- |MiniIndentscope.config| for a details example.
---
---@param line number Input line number (starts from 1). Can be modified to a
--- neighbor if `try_as_border` is `true`. Default: cursor line.
---@param col number Column number (starts from 1). Default: if
--- `indent_at_cursor` option is `true` - cursor column from `curswant` of
--- |getcurpos()| (allows for more natural behavior on empty lines);
--- `math.huge` otherwise in order to not incorporate cursor in computation.
---@param opts table Options to override global or buffer local ones (see
--- |MiniIndentscope.config|).
---
---@return table Table with scope information:
--- - <body> - table with <top> (top line of scope, inclusive), <bottom>
--- (bottom line of scope, inclusive), and <indent> (minimum indent withing
--- scope) keys. Line numbers start at 1.
--- - <border> - table with <top> (line of top border, might be `nil`),
--- <bottom> (line of bottom border, might be `nil`), and <indent> (indent
--- of border) keys. Line numbers start at 1.
--- - <buf_id> - identifier of current buffer.
--- - <reference> - table with <line> (reference line), <column> (reference
--- column), and <indent> ("indent at column") keys.
function MiniIndentscope.get_scope(line, col, opts)
opts = H.get_opts(opts)
-- Compute default `line` and\or `col`
if not (line and col) then
local curpos = vim.fn.getcurpos()
line = line or curpos[2]
line = opts.try_as_border and H.border_correctors[opts.border](line, opts) or line
-- Use `curpos[5]` (`curswant`, see `:h getcurpos()`) to account for blank
-- and empty lines.
col = col or (opts.indent_at_cursor and curpos[5] or math.huge)
end
-- Compute "indent at column"
local line_indent = H.get_line_indent(line, opts)
local indent = math.min(col, line_indent)
-- Make early return
local body = { indent = indent }
if indent <= 0 then
body.top, body.bottom, body.indent = 1, vim.fn.line('$'), line_indent
else
local up_min_indent, down_min_indent
body.top, up_min_indent = H.cast_ray(line, indent, 'up', opts)
body.bottom, down_min_indent = H.cast_ray(line, indent, 'down', opts)
body.indent = math.min(line_indent, up_min_indent, down_min_indent)
end
return {
body = body,
border = H.border_from_body[opts.border](body, opts),
buf_id = vim.api.nvim_get_current_buf(),
reference = { line = line, column = col, indent = indent },
}
end
--- Auto draw scope indicator based on movement events
---
--- Designed to be used with |autocmd|. No need to use it directly, everything
--- is setup in |MiniIndentscope.setup|.
---
---@param opts table Options.
function MiniIndentscope.auto_draw(opts)
if H.is_disabled() then
H.undraw_scope()
return
end
opts = opts or {}
local scope = MiniIndentscope.get_scope()
-- Make early return if nothing has to be done. Doing this before updating
-- event id allows to not interrupt ongoing animation.
if opts.lazy and H.current.draw_status ~= 'none' and H.scope_is_equal(scope, H.current.scope) then
return
end
-- Account for current event
local local_event_id = H.current.event_id + 1
H.current.event_id = local_event_id
-- Compute drawing options for current event
local draw_opts = H.make_autodraw_opts(scope)
-- Allow delay
if draw_opts.delay > 0 then
H.undraw_scope(draw_opts)
end
-- Use `defer_fn()` even if `delay` is 0 to draw indicator only after all
-- events are processed (stops flickering)
vim.defer_fn(function()
if H.current.event_id ~= local_event_id then
return
end
H.undraw_scope(draw_opts)
H.current.scope = scope
H.draw_scope(scope, draw_opts)
end, draw_opts.delay)
end
--- Draw scope manually
---
--- Scope is visualized as a vertical line withing scope's body range at column
--- equal to border indent plus one (or body indent if border is absent).
--- Numbering starts from one.
---
---@param scope table Scope. Default: output of |MiniIndentscope.get_scope|
--- with default arguments.
---@param opts table Options. Currently supported:
--- - <animation_fun> - animation function for drawing. See
--- |MiniIndentscope-drawing| and |MiniIndentscope.gen_animation()|.
function MiniIndentscope.draw(scope, opts)
scope = scope or MiniIndentscope.get_scope()
local draw_opts = vim.tbl_deep_extend('force', { animation_fun = MiniIndentscope.config.draw.animation }, opts or {})
H.undraw_scope()
H.current.scope = scope
H.draw_scope(scope, draw_opts)
end
--- Undraw currently visible scope manually
function MiniIndentscope.undraw()
H.undraw_scope()
end
--- Generate builtin animation function
---
--- This is a builtin source to generate animation function for usage in
--- `MiniIndentscope.config.draw.animation`. Most of them are variations of
--- common easing functions, which provide certain type of progression for
--- revealing scope visual indicator.
---
--- Supported easing types:
--- - `'none'` - show indicator immediately. Equivalent to animation function
--- always returning 0.
--- - `'linear'` - linear progression.
--- - Quadratic progression:
--- - `'quadraticIn'` - accelerating from zero speed.
--- - `'quadraticOut'` - decelerating to zero speed.
--- - `'quadraticInOut'` - accelerating halfway, decelerating after.
--- - Cubic progression:
--- - `'cubicIn'` - accelerating from zero speed.
--- - `'cubicOut'` - decelerating to zero speed.
--- - `'cubicInOut'` - accelerating halfway, decelerating after.
--- - Quartic progression:
--- - `'quarticIn'` - accelerating from zero speed.
--- - `'quarticOut'` - decelerating to zero speed.
--- - `'quarticInOut'` - accelerating halfway, decelerating after.
--- - Exponential progression:
--- - `'exponentialIn'` - accelerating from zero speed.
--- - `'exponentialOut'` - decelerating to zero speed.
--- - `'exponentialInOut'` - accelerating halfway, decelerating after.
---
--- Customization of duration and other general behavior of output animation
--- function is done through `opts` argument.
---
---@param easing string One of supported easing types.
---@param opts table Options that control progression. Possible keys:
--- - <duration> `(number)` - duration (in ms) of a unit. Default: 20.
--- - <unit> `(string)` - which unit's duration `opts.duration` controls. One
--- of "step" (default; ensures average duration of step to be `opts.duration`)
--- or "total" (ensures fixed total duration regardless of scope's range).
---
---@return function Animation function (see |MiniIndentscope-drawing|).
---
--- Examples~
--- - Don't use animation: `gen_animation('none')`
--- - Use quadratic "out" easing with total duration of 1000 ms:
--- `gen_animation('quadraticOut', { duration = 1000, unit = 'total' })`
---
---@seealso |MiniIndentscope-drawing| for more information about how drawing is done.
function MiniIndentscope.gen_animation(easing, opts)
--stylua: ignore start
if easing == 'none' then
return function() return 0 end
end
opts = vim.tbl_deep_extend('force', { duration = 20, unit = 'step' }, opts or {})
if not vim.tbl_contains({'total', 'step'}, opts.unit) then
H.message([[`opts.unit` should be one of 'step' or 'total'. Using 'step'.]])
opts.unit = 'step'
end
local easing_calls = {
linear = {impl = H.animation_arithmetic_powers, args = {0, 'in', opts}},
quadraticIn = {impl = H.animation_arithmetic_powers, args = {1, 'in', opts}},
quadraticOut = {impl = H.animation_arithmetic_powers, args = {1, 'out', opts}},
quadraticInOut = {impl = H.animation_arithmetic_powers, args = {1, 'in-out', opts}},
cubicIn = {impl = H.animation_arithmetic_powers, args = {2, 'in', opts}},
cubicOut = {impl = H.animation_arithmetic_powers, args = {2, 'out', opts}},
cubicInOut = {impl = H.animation_arithmetic_powers, args = {2, 'in-out', opts}},
quarticIn = {impl = H.animation_arithmetic_powers, args = {3, 'in', opts}},
quarticOut = {impl = H.animation_arithmetic_powers, args = {3, 'out', opts}},
quarticInOut = {impl = H.animation_arithmetic_powers, args = {3, 'in-out', opts}},
exponentialIn = {impl = H.animation_geometrical_powers, args = {'in', opts}},
exponentialOut = {impl = H.animation_geometrical_powers, args = {'out', opts}},
exponentialInOut = {impl = H.animation_geometrical_powers, args = {'in-out', opts}},
}
local allowed_easing_types = vim.tbl_keys(easing_calls)
table.sort(allowed_easing_types)
if not vim.tbl_contains(allowed_easing_types, easing) then
H.message(('`easing` should be one of: %s.'):format(table.concat(allowed_easing_types, ', ')))
return
end
local parts = easing_calls[easing]
return parts.impl(unpack(parts.args))
--stylua: ignore end
end
--- Move cursor within scope
---
--- Cursor is placed on a first non-blank character of target line.
---
---@param side string One of "top" or "bottom".
---@param use_border boolean Whether to move to border or withing scope's body.
--- If particular border is absent, body is used.
---@param scope table Scope to use. Default: output of |MiniIndentscope.get_scope()|.
function MiniIndentscope.move_cursor(side, use_border, scope)
scope = scope or MiniIndentscope.get_scope()
-- This defaults to body's side if it is not present in border
local target_line = use_border and scope.border[side] or scope.body[side]
target_line = math.min(math.max(target_line, 1), vim.fn.line('$'))
vim.api.nvim_win_set_cursor(0, { target_line, 0 })
-- Move to first non-blank character to allow chaining scopes
vim.cmd('normal! ^')
end
--- Function for motion mappings
---
--- Move to a certain side of border. Respects |count| and dot-repeat (in
--- operator-pending mode). Doesn't move cursor for scope that is not shown
--- (drawing indent less that zero).
---
---@param side string One of "top" or "bottom".
---@param add_to_jumplist boolean Whether to add movement to jump list. It is
--- `true` only for Normal mode mappings.
function MiniIndentscope.operator(side, add_to_jumplist)
local scope = MiniIndentscope.get_scope()
-- Don't support scope that can't be shown
if H.scope_get_draw_indent(scope) < 0 then
return
end
-- Add movement to jump list. Needs remembering `count1` before that because
-- it seems to reset it to 1.
local count = vim.v.count1
if add_to_jumplist then
vim.cmd('normal! m`')
end
-- Make sequence of jumps
for _ = 1, count do
MiniIndentscope.move_cursor(side, true, scope)
-- Use `try_as_border = false` to enable chaining
scope = MiniIndentscope.get_scope(nil, nil, { try_as_border = false })
-- Don't support scope that can't be shown
if H.scope_get_draw_indent(scope) < 0 then
return
end
end
end
--- Function for textobject mappings
---
--- Respects |count| and dot-repeat (in operator-pending mode). Doesn't work
--- for scope that is not shown (drawing indent less that zero).
---
---@param use_border boolean Whether to include border in textobject. When
--- `true` and `try_as_border` option is `false`, allows "chaining" calls for
--- incremental selection.
function MiniIndentscope.textobject(use_border)
local scope = MiniIndentscope.get_scope()
-- Don't support scope that can't be shown
if H.scope_get_draw_indent(scope) < 0 then
return
end
-- Allow chaining only if using border
local count = use_border and vim.v.count1 or 1
-- Make sequence of incremental selections
for _ = 1, count do
-- Try finish cursor on border
local start, finish = 'top', 'bottom'
if use_border and scope.border.bottom == nil then
start, finish = 'bottom', 'top'
end
H.exit_visual_mode()
MiniIndentscope.move_cursor(start, use_border, scope)
vim.cmd('normal! V')
MiniIndentscope.move_cursor(finish, use_border, scope)
-- Use `try_as_border = false` to enable chaining
scope = MiniIndentscope.get_scope(nil, nil, { try_as_border = false })
-- Don't support scope that can't be shown
if H.scope_get_draw_indent(scope) < 0 then
return
end
end
end
-- Helper data ================================================================
-- Module default config
H.default_config = MiniIndentscope.config
-- Namespace for drawing vertical line
H.ns_id = vim.api.nvim_create_namespace('MiniIndentscope')
-- Timer for doing animation
H.timer = vim.loop.new_timer()
-- Table with current relevalnt data:
-- - `event_id` - counter for events.
-- - `scope` - latest drawn scope.
-- - `draw_status` - status of current drawing.
H.current = { event_id = 0, scope = {}, draw_status = 'none' }
-- Functions to compute indent in ambiguous cases
H.indent_funs = {
['min'] = function(top_indent, bottom_indent)
return math.min(top_indent, bottom_indent)
end,
['max'] = function(top_indent, bottom_indent)
return math.max(top_indent, bottom_indent)
end,
['top'] = function(top_indent, bottom_indent)
return top_indent
end,
['bottom'] = function(top_indent, bottom_indent)
return bottom_indent
end,
}
-- Functions to compute indent of blank line to satisfy `config.options.border`
H.blank_indent_funs = {
['none'] = H.indent_funs.min,
['top'] = H.indent_funs.bottom,
['bottom'] = H.indent_funs.top,
['both'] = H.indent_funs.max,
}
-- Functions to compute border from body
H.border_from_body = {
['none'] = function(body, opts)
return {}
end,
['top'] = function(body, opts)
return { top = body.top - 1, indent = H.get_line_indent(body.top - 1, opts) }
end,
['bottom'] = function(body, opts)
return { bottom = body.bottom + 1, indent = H.get_line_indent(body.bottom + 1, opts) }
end,
['both'] = function(body, opts)
return {
top = body.top - 1,
bottom = body.bottom + 1,
indent = math.max(H.get_line_indent(body.top - 1, opts), H.get_line_indent(body.bottom + 1, opts)),
}
end,
}
-- Functions to correct line in case it is a border
H.border_correctors = {
['none'] = function(line, opts)
return line
end,
['top'] = function(line, opts)
local cur_indent, next_indent = H.get_line_indent(line, opts), H.get_line_indent(line + 1, opts)
return (cur_indent < next_indent) and (line + 1) or line
end,
['bottom'] = function(line, opts)
local prev_indent, cur_indent = H.get_line_indent(line - 1, opts), H.get_line_indent(line, opts)
return (cur_indent < prev_indent) and (line - 1) or line
end,
['both'] = function(line, opts)
local prev_indent, cur_indent, next_indent =
H.get_line_indent(line - 1, opts), H.get_line_indent(line, opts), H.get_line_indent(line + 1, opts)
if prev_indent <= cur_indent and next_indent <= cur_indent then
return line
end
-- If prev and next indents are equal and bigger than current, prefer next
if prev_indent <= next_indent then
return line + 1
end
return line - 1
end,
}
-- Helper functionality =======================================================
-- Settings -------------------------------------------------------------------
function H.setup_config(config)
-- General idea: if some table elements are not present in user-supplied
-- `config`, take them from default config
vim.validate({ config = { config, 'table', true } })
config = vim.tbl_deep_extend('force', H.default_config, config or {})
-- Validate per nesting level to produce correct error message
vim.validate({
draw = { config.draw, 'table' },
mappings = { config.mappings, 'table' },
options = { config.options, 'table' },
symbol = { config.symbol, 'string' },
})
vim.validate({
['draw.delay'] = { config.draw.delay, 'number' },
['draw.animation'] = { config.draw.animation, 'function' },
['mappings.object_scope'] = { config.mappings.object_scope, 'string' },
['mappings.object_scope_with_border'] = { config.mappings.object_scope_with_border, 'string' },
['mappings.goto_top'] = { config.mappings.goto_top, 'string' },
['mappings.goto_bottom'] = { config.mappings.goto_bottom, 'string' },
['options.border'] = { config.options.border, 'string' },
['options.indent_at_cursor'] = { config.options.indent_at_cursor, 'boolean' },
['options.try_as_border'] = { config.options.try_as_border, 'boolean' },
})
return config
end
function H.apply_config(config)
MiniIndentscope.config = config
local maps = config.mappings
--stylua: ignore start
H.map('n', maps.goto_top, [[<Cmd>lua MiniIndentscope.operator('top', true)<CR>]], { desc = 'Go to indent scope top' })
H.map('n', maps.goto_bottom, [[<Cmd>lua MiniIndentscope.operator('bottom', true)<CR>]], { desc = 'Go to indent scope bottom' })
H.map('x', maps.goto_top, [[<Cmd>lua MiniIndentscope.operator('top')<CR>]], { desc = 'Go to indent scope top' })
H.map('x', maps.goto_bottom, [[<Cmd>lua MiniIndentscope.operator('bottom')<CR>]], { desc = 'Go to indent scope bottom' })
H.map('x', maps.object_scope, '<Cmd>lua MiniIndentscope.textobject(false)<CR>', { desc = 'Object scope' })
H.map('x', maps.object_scope_with_border, '<Cmd>lua MiniIndentscope.textobject(true)<CR>', { desc = 'Object scope with border' })
H.map('o', maps.goto_top, [[<Cmd>lua MiniIndentscope.operator('top')<CR>]], { desc = 'Go to indent scope top' })
H.map('o', maps.goto_bottom, [[<Cmd>lua MiniIndentscope.operator('bottom')<CR>]], { desc = 'Go to indent scope bottom' })
H.map('o', maps.object_scope, '<Cmd>lua MiniIndentscope.textobject(false)<CR>', { desc = 'Object scope' })
H.map('o', maps.object_scope_with_border, '<Cmd>lua MiniIndentscope.textobject(true)<CR>', { desc = 'Object scope with border' })
--stylua: ignore start
end
function H.is_disabled()
return vim.g.miniindentscope_disable == true or vim.b.miniindentscope_disable == true
end
function H.get_opts(opts)
local opts_local = vim.b.miniindentscope_options
local opts_global = MiniIndentscope.config.options
return vim.tbl_deep_extend('force', opts_global, opts_local or {}, opts or {})
end
-- Scope ----------------------------------------------------------------------
-- Line indent:
-- - Equals output of `vim.fn.indent()` in case of non-blank line.
-- - Depends on `MiniIndentscope.config.options.border` in such way so as to
-- ignore blank lines before line not recognized as border.
function H.get_line_indent(line, opts)
local prev_nonblank = vim.fn.prevnonblank(line)
local res = vim.fn.indent(prev_nonblank)
-- Compute indent of blank line depending on `options.border` values
if line ~= prev_nonblank then
local next_indent = vim.fn.indent(vim.fn.nextnonblank(line))
local blank_rule = H.blank_indent_funs[opts.border]
res = blank_rule(res, next_indent)
end
return res
end
function H.cast_ray(line, indent, direction, opts)
local final_line, increment = 1, -1
if direction == 'down' then
final_line, increment = vim.fn.line('$'), 1
end
local min_indent = math.huge
for l = line, final_line, increment do
local new_indent = H.get_line_indent(l + increment, opts)
if new_indent < indent then
return l, min_indent
end
if new_indent < min_indent then
min_indent = new_indent
end
end
return final_line, min_indent
end
function H.scope_get_draw_indent(scope)
return scope.border.indent or (scope.body.indent - 1)
end
function H.scope_is_equal(scope_1, scope_2)
if type(scope_1) ~= 'table' or type(scope_2) ~= 'table' then
return false
end
return scope_1.buf_id == scope_2.buf_id
and H.scope_get_draw_indent(scope_1) == H.scope_get_draw_indent(scope_2)
and scope_1.body.top == scope_2.body.top
and scope_1.body.bottom == scope_2.body.bottom
end
function H.scope_has_intersect(scope_1, scope_2)
if type(scope_1) ~= 'table' or type(scope_2) ~= 'table' then
return false
end
if (scope_1.buf_id ~= scope_2.buf_id) or (H.scope_get_draw_indent(scope_1) ~= H.scope_get_draw_indent(scope_2)) then
return false
end
local body_1, body_2 = scope_1.body, scope_2.body
return (body_2.top <= body_1.top and body_1.top <= body_2.bottom)
or (body_1.top <= body_2.top and body_2.top <= body_1.bottom)
end
-- Indicator ------------------------------------------------------------------
--- Compute indicator of scope to be displayed
---
--- Indicator is visual representation of scope in current window view using
--- extmarks. Currently only needed because Neovim can't correctly process
--- horizontal window scroll (Neovim issue:
--- https://github.com/neovim/neovim/issues/14050)
---
---@return table|nil Table with indicator info or empty one in case indicator
--- shouldn't be drawn.
---@private
function H.indicator_compute(scope)
scope = scope or H.current.scope
local indent = H.scope_get_draw_indent(scope)
-- Don't draw indicator that should be outside of screen. This condition is
-- (perpusfully) "responsible" for not drawing indicator spanning whole file.
if indent < 0 then
return {}
end
-- Extmarks will be located at column zero but show indented text:
-- - This allows showing line even on empty lines.
-- - Text indentation should depend on current window view because extmarks
-- can't scroll to be past left window side. Sources:
-- - Neovim issue: https://github.com/neovim/neovim/issues/14050
-- - Used fix: https://github.com/lukas-reineke/indent-blankline.nvim/pull/155
local leftcol = vim.fn.winsaveview().leftcol
if indent < leftcol then
return {}
end
-- Usage separate highlight groups for prefix and symbol allows cursor to be
-- "natural" when on the left of indicator line (like on empty lines)
local virt_text = { { MiniIndentscope.config.symbol, 'MiniIndentscopeSymbol' } }
local prefix = string.rep(' ', indent - leftcol)
-- Currently Neovim doesn't work when text for extmark is empty string
if prefix:len() > 0 then
table.insert(virt_text, 1, { prefix, 'MiniIndentscopePrefix' })
end
local top = scope.body.top
local bottom = scope.body.bottom
return { buf_id = vim.api.nvim_get_current_buf(), virt_text = virt_text, top = top, bottom = bottom }
end
-- Drawing --------------------------------------------------------------------
function H.draw_scope(scope, opts)
scope = scope or {}
opts = opts or {}
local indicator = H.indicator_compute(scope)
-- Don't draw anything if nothing to be displayed
if indicator.virt_text == nil or #indicator.virt_text == 0 then
H.current.draw_status = 'finished'
return
end
-- Make drawing function
local draw_fun = H.make_draw_function(indicator, opts)
-- Perform drawing
H.current.draw_status = 'drawing'
H.draw_indicator_animation(indicator, draw_fun, opts.animation_fun)
end
function H.draw_indicator_animation(indicator, draw_fun, animation_fun)
-- Draw from origin (cursor line but wihtin indicator range)
local top, bottom = indicator.top, indicator.bottom
local origin = math.min(math.max(vim.fn.line('.'), top), bottom)
local step = 0
local n_steps = math.max(origin - top, bottom - origin)
local wait_time = 0
local draw_step
draw_step = vim.schedule_wrap(function()
-- Check for not drawing outside of interval is done inside `draw_fun`
local success = draw_fun(origin - step)
if step > 0 then
success = success and draw_fun(origin + step)
end
if not success or step == n_steps then
H.current.draw_status = step == n_steps and 'finished' or H.current.draw_status
H.timer:stop()
return
end
step = step + 1
wait_time = wait_time + animation_fun(step, n_steps)
-- Repeat value of `timer` seems to be rounded down to milliseconds. This
-- means that values less than 1 will lead to timer stop repeating. Instead
-- call next step function directly.
if wait_time < 1 then
H.timer:set_repeat(0)
-- Use `return` to make this proper "tail call"
return draw_step()
else
H.timer:set_repeat(wait_time)
-- Restart `wait_time` only if it is actually used
wait_time = 0
-- Usage of `again()` is needed to overcome the fact that it is called
-- inside callback and to restart initial timer. Mainly this is needed
-- only in case of transition from 'non-repeating' timer to 'repeating'
-- one in case of complex animation functions. See
-- https://docs.libuv.org/en/v1.x/timer.html#api
H.timer:again()
end
end)
-- Start non-repeating timer without callback execution. This shouldn't be
-- `timer:start(0, 0, draw_step)` because it will execute `draw_step` on the
-- next redraw (flickers on window scroll).
H.timer:start(10000000, 0, draw_step)
-- Draw step zero (at origin) immediately
draw_step()
end
function H.undraw_scope(opts)
opts = opts or {}
-- Don't operate outside of current event if able to verify
if opts.event_id and opts.event_id ~= H.current.event_id then
return
end
pcall(vim.api.nvim_buf_clear_namespace, H.current.scope.buf_id or 0, H.ns_id, 0, -1)
H.current.draw_status = 'none'
H.current.scope = {}
end
function H.make_autodraw_opts(scope)
local res = {
event_id = H.current.event_id,
type = 'animation',
delay = MiniIndentscope.config.draw.delay,
animation_fun = MiniIndentscope.config.draw.animation,
}
if H.current.draw_status == 'none' then
return res
end
-- Draw immediately scope which intersects (same indent, overlapping ranges)
-- currently drawn or finished. This is more natural when typing text.
if H.scope_has_intersect(scope, H.current.scope) then
res.type = 'immediate'
res.delay = 0