Repository navigation
Expand file tree
/
Copy pathsurround.lua
More file actions
969 lines (854 loc) · 34.2 KB
/
Copy pathsurround.lua
File metadata and controls
969 lines (854 loc) · 34.2 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
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
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
-- MIT License Copyright (c) 2021 Evgeni Chasnovski
-- Documentation ==============================================================
---@brief [[
--- Custom somewhat minimal and fast surrounding Lua plugin. This is mostly
--- a reimplementation of the core features of 'machakann/vim-sandwich' with a
--- couple more on top (find surrounding, highlight surrounding).
---
--- Features:
--- - Actions (all of them are dot-repeatable out of the box):
--- - Add surrounding with `sa` (in visual mode or on motion).
--- - Delete surrounding with `sd`.
--- - Replace surrounding with `sr`.
--- - Find surrounding with `sf` or `sF` (move cursor right or left).
--- - Highlight surrounding with `sh`.
--- - Change number of neighbor lines with `sn` (see algorithm details).
--- - Surrounding is identified by a single character as both 'input' (in
--- `delete` and `replace` start) and 'output' (in `add` and `replace` end):
--- - 'f' - function call (string of letters or '_' or '.' followed by
--- balanced '()'). In 'input' finds function call, in 'output'
--- prompts user to enter function name.
--- - 'i' - interactive. Prompts user to enter left and right parts.
--- - 't' - tag. In 'input' finds tab with same identifier, in 'output'
--- prompts user to enter tag name.
--- - All symbols in brackets '()', '[]', '{}', '<>'. In 'input' represents
--- balanced brackets, in 'output' - left and right parts of brackets.
--- - All other alphanumeric, punctuation, or space characters represent
--- surrounding with identical left and right parts.
---
--- Known issues which won't be resolved:
--- - Search for surrounding is done using Lua patterns (regex-like approach).
--- So certain amount of false positives should be expected.
--- - When searching for 'input' surrounding, there is no distinction if it is
--- inside string or comment. So in this case there will be not proper match
--- for a function call: 'f(a = ")", b = 1)'.
--- - Tags are searched using regex-like methods, so issues are inevitable.
--- Overall it is pretty good, but certain cases won't work. Like self-nested
--- tags won't match correctly on both ends: '<a><a></a></a>'.
---
--- # Setup
---
--- This module needs a setup with `require('mini.surround').setup({})`
--- (replace `{}` with your `config` table). It will create global Lua table
--- `MiniSurround` which you can use for scripting or manually (with
--- `:lua MiniSurround.*`).
---
--- Default `config`:
--- <code>
--- {
--- -- Number of lines within which surrounding is searched
--- n_lines = 20,
---
--- -- Duration (in ms) of highlight when calling `MiniSurround.highlight()`
--- highlight_duration = 500,
---
--- -- Pattern to match function name in 'function call' surrounding
--- -- By default it is a string of letters, '_' or '.'
--- funname_pattern = '[%w_%.]+',
---
--- -- Mappings. Use `''` (empty string) to disable one.
--- mappings = {
--- add = 'sa', -- Add surrounding
--- delete = 'sd', -- Delete surrounding
--- find = 'sf', -- Find surrounding (to the right)
--- find_left = 'sF', -- Find surrounding (to the left)
--- highlight = 'sh', -- Highlight surrounding
--- replace = 'sr', -- Replace surrounding
--- update_n_lines = 'sn' -- Update `n_lines`
--- }
--- }
--- </code>
--- # Example usage
---
--- - `saiw)` - add (`sa`) for inner word (`iw`) parenthesis (`)`).
--- - `saiwi[[<CR>]]<CR>` - add (`sa`) for inner word (`iw`) interactive
--- surrounding (`i`): `[[` for left and `]]` for right.
--- - `sdf` - delete (`sd`) surrounding function call (`f`).
--- - `sr)tdiv<CR>` - replace (`sr`) surrounding parenthesis (`)`) with tag
--- (`t`) with identifier 'div' (`div<CR>` in command line prompt).
--- - `sff` - find right (`sf`) part of surrounding function call (`f`).
--- - `sh}` - highlight (`sh`) for a brief period of time surrounding curly
--- brackets (`}`)
---
--- # Algorithm design
---
--- - Adding 'output' surrounding has a fairly straightforward algorithm:
--- - Determine places for left and right parts (via `<>` or `[]` marks).
--- - Determine left and right parts of surrounding.
--- - Properly add.
--- - Finding 'input' surrounding is a lot more complicated and is a reason why
--- this implementation is only somewhat minimal. In a nutshell, current
--- algorithm `searches in the neighborhood lines based on a certain pattern
--- a _smallest_ match that covers cursor`. More detailed:
--- - Extract neighborhood of cursor line: no more than
--- `MiniSurround.config.n_lines` before, cursor line itself, no more than
--- `MiniSurround.config.n_lines` after.
--- - Convert it to '1d neighborhood' by concatenating with '\n' delimiter.
--- Compute location of current cursor position in this line.
--- - Given Lua pattern for a 'input' surrounding, search for a smallest
--- (with minimal width) match that covers cursor position. This is an
--- iterative procedure, duration of which heavily depends on the length
--- of '1d neighborhood' and frequency of pattern matching. If no match is
--- found, there is no surrounding.
--- - Compute parts of '1d neighborhood' that represent left and right part
--- of found surrounding. This is done by using 'extract' pattern computed
--- for every type of surrounding.
--- - Convert '1d offsets' of found parts to their positions in buffer.
--- Actual search is done firstly on cursor line (as it is the most frequent
--- usage) and only then searches in neighborhood.
---
--- # Highlight groups
---
--- 1. `MiniSurround` - highlighting of requested surrounding.
---
--- To change any highlight group, modify it directly with |:highlight|.
---
--- # Disabling
---
--- To disable, set `g:minisurround_disable` (globally) or
--- `b:minisurround_disable` (for a buffer) to `v:true`.
---@brief ]]
---@tag MiniSurround mini.surround
-- Module definition ==========================================================
local MiniSurround = {}
local H = {}
--- Module setup
---
---@param config table: Module config table.
---@usage `require('mini.surround').setup({})` (replace `{}` with your `config` table)
function MiniSurround.setup(config)
-- Export module
_G.MiniSurround = MiniSurround
-- Setup config
config = H.setup_config(config)
-- Apply config
H.apply_config(config)
-- Create highlighting
vim.api.nvim_exec([[hi default link MiniSurround IncSearch]], false)
end
MiniSurround.config = {
-- Number of lines within which surrounding is searched
n_lines = 20,
-- Duration of highlight when calling `MiniSurround.highlight()`
highlight_duration = 500,
-- Pattern to match function name in 'function call' surrounding
funname_pattern = '[%w_%.]+',
-- Mappings
mappings = {
add = 'sa', -- Add surrounding
delete = 'sd', -- Delete surrounding
find = 'sf', -- Find surrounding (to the right)
find_left = 'sF', -- Find surrounding (to the left)
highlight = 'sh', -- Highlight surrounding
replace = 'sr', -- Replace surrounding
update_n_lines = 'sn', -- Update `n_lines`
},
}
-- Module functionality =======================================================
--- Surround operator
---
--- Main function to be used in expression mappings. No need to use it
--- directly, everything is setup in |MiniSurround.setup|.
---
---@param task string: Name of surround task.
---@param cache table: Task cache.
function MiniSurround.operator(task, cache)
if H.is_disabled() then
return ''
end
H.cache = cache or {}
vim.cmd(string.format('set operatorfunc=v:lua.MiniSurround.%s', task))
return 'g@'
end
--- Add surrounding
---
--- No need to use it directly, everything is setup in |MiniSurround.setup|.
---
---@param mode string: Mapping mode (normal by default).
function MiniSurround.add(mode)
-- Needed to disable in visual mode
if H.is_disabled() then
return ''
end
-- Get marks' positions based on current mode
local marks = H.get_marks_pos(mode)
-- Get surround info. Try take from cache only in not visual mode (as there
-- is no intended dot-repeatability).
local surr_info
if mode == 'visual' then
surr_info = H.get_surround_info('output', false)
else
surr_info = H.get_surround_info('output', true)
end
if surr_info == nil then
return ''
end
-- Add surrounding. Begin insert with 'end' to not break column numbers
-- Insert after the right mark (`+ 1` is for that)
H.insert_into_line(marks.second.line, marks.second.col + 1, surr_info.right)
H.insert_into_line(marks.first.line, marks.first.col, surr_info.left)
-- Tweak cursor position
H.cursor_adjust(marks.first.line, marks.first.col + surr_info.left:len())
end
--- Delete surrounding
---
--- No need to use it directly, everything is setup in |MiniSurround.setup|.
function MiniSurround.delete()
-- Find input surrounding
local surr = H.find_surrounding(H.get_surround_info('input', true))
if surr == nil then
return ''
end
-- Delete surrounding. Begin with right to not break column numbers
H.delete_linepart(surr.right)
H.delete_linepart(surr.left)
-- Tweak cursor position
H.cursor_adjust(surr.left.line, surr.left.from)
end
--- Replace surrounding
---
--- No need to use it directly, everything is setup in |MiniSurround.setup|.
function MiniSurround.replace()
-- Find input surrounding
local surr = H.find_surrounding(H.get_surround_info('input', true))
if surr == nil then
return ''
end
-- Get output surround info
local new_surr_info = H.get_surround_info('output', true)
if new_surr_info == nil then
return ''
end
-- Delete input surrounding. Begin with right to not break column numbers
H.delete_linepart(surr.right)
H.delete_linepart(surr.left)
-- Compute adjustment for adding right surrounding
local n_del_left = 0
if surr.left.line == surr.right.line then
n_del_left = surr.left.to - surr.left.from + 1
end
-- Add output surrounding. Begin insert with 'end' to not break column numbers
H.insert_into_line(surr.right.line, surr.right.from - n_del_left, new_surr_info.right)
H.insert_into_line(surr.left.line, surr.left.from, new_surr_info.left)
-- Tweak cursor position
H.cursor_adjust(surr.left.line, surr.left.from + new_surr_info.left:len())
end
--- Find surrounding
---
--- No need to use it directly, everything is setup in |MiniSurround.setup|.
function MiniSurround.find()
-- Find surrounding
local surr = H.find_surrounding(H.get_surround_info('input', true))
if surr == nil then
return ''
end
-- Make array of positions to cycle through
local pos_array = H.linepart_to_pos_table(surr.left)
local pos_table_right = H.linepart_to_pos_table(surr.right)
for _, v in pairs(pos_table_right) do
table.insert(pos_array, v)
end
-- Cycle cursor through positions
local dir = H.cache.direction or 'right'
H.cursor_cycle(pos_array, dir)
-- Open 'enough folds' to show cursor
vim.cmd([[normal! zv]])
end
--- Highlight surrounding
---
--- No need to use it directly, everything is setup in |MiniSurround.setup|.
function MiniSurround.highlight()
-- Find surrounding
local surr = H.find_surrounding(H.get_surround_info('input', true))
if surr == nil then
return ''
end
-- Highlight surrounding
vim.api.nvim_buf_add_highlight(0, H.ns_id, 'MiniSurround', surr.left.line - 1, surr.left.from - 1, surr.left.to)
vim.api.nvim_buf_add_highlight(0, H.ns_id, 'MiniSurround', surr.right.line - 1, surr.right.from - 1, surr.right.to)
vim.defer_fn(function()
vim.api.nvim_buf_clear_namespace(0, H.ns_id, surr.left.line - 1, surr.right.line)
end, MiniSurround.config.highlight_duration)
end
--- Update `MiniSurround.config.n_lines`
---
--- Convenient wrapper for updating `MiniSurround.config.n_lines` in case the
--- default one is not appropriate.
function MiniSurround.update_n_lines()
if H.is_disabled() then
return ''
end
local n_lines = H.user_input('New number of neighbor lines', MiniSurround.config.n_lines)
n_lines = math.floor(tonumber(n_lines) or MiniSurround.config.n_lines)
MiniSurround.config.n_lines = n_lines
end
-- Helper data ================================================================
-- Module default config
H.default_config = MiniSurround.config
-- Namespace for highlighting
H.ns_id = vim.api.nvim_create_namespace('MiniSurround')
-- Table of non-special surroundings
H.surroundings = setmetatable({
-- Brackets that need balancing
['('] = { find = '%b()', left = '(', right = ')' },
[')'] = { find = '%b()', left = '(', right = ')' },
['['] = { find = '%b[]', left = '[', right = ']' },
[']'] = { find = '%b[]', left = '[', right = ']' },
['{'] = { find = '%b{}', left = '{', right = '}' },
['}'] = { find = '%b{}', left = '{', right = '}' },
['<'] = { find = '%b<>', left = '<', right = '>' },
['>'] = { find = '%b<>', left = '<', right = '>' },
}, {
__index = function(table, key)
local key_esc = vim.pesc(key)
return { find = key_esc .. '.-' .. key_esc, left = key, right = key }
end,
})
-- Cache for dot-repeatability. This table is currently used with these keys:
-- - 'input' - surround info for searching (in 'delete' and 'replace' start).
-- - 'output' - surround info for adding (in 'add' and 'replace' end).
-- - 'direction' - direction in which `MiniSurround.find()` should go. Used to
-- enable same `operatorfunc` pattern for dot-repeatability.
H.cache = {}
-- Helper table for `H.user_surround_id()` to keep track of help messages
H.needs_help_msg = {}
-- 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 {})
vim.validate({
n_lines = { config.n_lines, 'number' },
highlight_duration = { config.highlight_duration, 'number' },
funname_pattern = { config.funname_pattern, 'string' },
mappings = { config.mappings, 'table' },
['mappings.add'] = { config.mappings.add, 'string' },
['mappings.delete'] = { config.mappings.delete, 'string' },
['mappings.find'] = { config.mappings.find, 'string' },
['mappings.find_left'] = { config.mappings.find_left, 'string' },
['mappings.highlight'] = { config.mappings.highlight, 'string' },
['mappings.replace'] = { config.mappings.replace, 'string' },
['mappings.update_n_lines'] = { config.mappings.update_n_lines, 'string' },
})
return config
end
function H.apply_config(config)
MiniSurround.config = config
-- Make mappings
-- NOTE: In mappings construct ` . ' '` "disables" motion required by `g@`.
-- It is used to enable dot-repeatability.
H.keymap(
'n',
config.mappings.add,
[[v:lua.MiniSurround.operator('add')]],
{ expr = true, noremap = true, silent = true }
)
H.keymap('x', config.mappings.add, [[:<c-u>lua MiniSurround.add('visual')<cr>]], { noremap = true, silent = true })
H.keymap(
'n',
config.mappings.delete,
[[v:lua.MiniSurround.operator('delete') . ' ']],
{ expr = true, noremap = true, silent = true }
)
H.keymap(
'n',
config.mappings.replace,
[[v:lua.MiniSurround.operator('replace') . ' ']],
{ expr = true, noremap = true, silent = true }
)
H.keymap(
'n',
config.mappings.find,
[[v:lua.MiniSurround.operator('find', {'direction': 'right'}) . ' ']],
{ expr = true, noremap = true, silent = true }
)
H.keymap(
'n',
config.mappings.find_left,
[[v:lua.MiniSurround.operator('find', {'direction': 'left'}) . ' ']],
{ expr = true, noremap = true, silent = true }
)
H.keymap(
'n',
config.mappings.highlight,
[[v:lua.MiniSurround.operator('highlight') . ' ']],
{ expr = true, noremap = true, silent = true }
)
H.keymap(
'n',
config.mappings.update_n_lines,
[[<cmd>lua MiniSurround.update_n_lines()<cr>]],
{ noremap = true, silent = true }
)
end
function H.is_disabled()
return vim.g.minisurround_disable == true or vim.b.minisurround_disable == true
end
-- Find surrounding
-- NOTE: more simple approach for `find_surrounding()` would have been to use
-- combination of `searchpairpos()` (to search for balanced pair) and
-- `searchpos()` (to search end of balanced search and for unbalanced pairs).
-- However, there are several problems with it:
-- - It is slower (around 2-5 times) than current Lua pattern approach.
-- - It has limitations when dealing with crucial 'function call' search.
-- Function call is defined as 'non-empty function name followed by balanced
-- pair of "(" and ")"'. Naive use of `searchpairpos()` is to use
-- `searchpairpos('\w\+(', '', ')')` which works most of the time. However,
-- in example `foo(a = (1 + 1), b = c(1, 2))` this will match
-- `o(a = (1 + 1)` when cursor is on 'a'. This is because '(' inside it is
-- not recognized for balancing because it doesn't match '\w\+('.
--
-- Vim's approach also has some upsides:
-- - `searchpairpos()` allows skipping of certain matches, like if it is inside
-- string or comment. It works decently well with example from help (with
-- `synIDattr`, etc.) but this only works when Vim's builtin highlighting is
-- used. When treesitter's highlighting is active, this doesn't work.
--
-- All in all, using Vim's builtin functions is doable, but leads to roughly
-- same efforts as Lua pattern approach.
function H.find_surrounding(surround_info)
-- `surround_info` should have `find` field with surrounding pattern. If
-- needed, it should also have a `extract` field with extract pattern for two
-- parts of surrounding assuming they are at the start and end of string.
if surround_info == nil then
return nil
end
local n_lines = MiniSurround.config.n_lines
-- First try only current line as it is the most common use case
local surr = H.find_surrounding_in_neighborhood(surround_info, 0)
or H.find_surrounding_in_neighborhood(surround_info, n_lines)
if surr == nil then
H.notify(string.format([[No surrounding '%s' found within %d lines.]], surround_info.id, n_lines))
end
return surr
end
-- Work with operator marks ---------------------------------------------------
function H.get_marks_pos(mode)
-- Region is inclusive on both ends
local mark1, mark2
if mode == 'visual' then
mark1, mark2 = '<', '>'
else
mark1, mark2 = '[', ']'
end
local pos1 = vim.api.nvim_buf_get_mark(0, mark1)
local pos2 = vim.api.nvim_buf_get_mark(0, mark2)
-- Tweak position in linewise mode as marks are placed on the first column
local is_linewise = (mode == 'line') or (mode == 'visual' and vim.fn.visualmode() == 'V')
if is_linewise then
-- Move start mark past the indent
pos1[2] = vim.fn.indent(pos1[1])
-- Move end mark to the last character (` - 2` here because `col()` returns
-- column right after the last 1-based column)
pos2[2] = vim.fn.col({ pos2[1], '$' }) - 2
end
-- Make columns 1-based instead of 0-based. This is needed because
-- `nvim_buf_get_mark()` returns the first 0-based byte of mark symbol and
-- all the following operations are done with Lua's 1-based indexing.
pos1[2], pos2[2] = pos1[2] + 1, pos2[2] + 1
-- Tweak second position to respect multibyte characters. Reasoning:
-- - These positions will be used with 'insert_into_line(line, col, text)' to
-- add some text. Its logic is `line[1:(col - 1)] + text + line[col:]`,
-- where slicing is meant on byte level.
-- - For the first mark we want the first byte of symbol, then text will be
-- insert to the left of the mark.
-- - For the second mark we want last byte of symbol. To add surrounding to
-- the right, use `pos2[2] + 1`.
local line2 = vim.fn.getline(pos2[1])
-- This returns the last byte inside character because `vim.str_byteindex()`
-- 'rounds upwards to the end of that sequence'.
pos2[2] = vim.str_byteindex(
line2,
-- Use `math.min()` because it might lead to 'index out of range' error
-- when mark is positioned at the end of line (that extra space which is
-- selected when selecting with `v$`)
vim.str_utfindex(line2, math.min(#line2, pos2[2]))
)
return {
first = { line = pos1[1], col = pos1[2] },
second = { line = pos2[1], col = pos2[2] },
}
end
-- Work with cursor -----------------------------------------------------------
function H.cursor_adjust(line, col)
local cur_pos = vim.api.nvim_win_get_cursor(0)
-- Only adjust cursor if it is on the same line
if cur_pos[1] ~= line then
return
end
vim.api.nvim_win_set_cursor(0, { line, col - 1 })
end
function H.compare_pos(pos1, pos2)
if pos1.line < pos2.line then
return '<'
end
if pos1.line > pos2.line then
return '>'
end
if pos1.col < pos2.col then
return '<'
end
if pos1.col > pos2.col then
return '>'
end
return '='
end
function H.cursor_cycle(pos_array, dir)
local cur_pos = vim.api.nvim_win_get_cursor(0)
cur_pos = { line = cur_pos[1], col = cur_pos[2] + 1 }
local compare, to_left, to_right, res_pos
-- NOTE: `pos_array` should be an increasingly ordered array of positions
for _, pos in pairs(pos_array) do
compare = H.compare_pos(cur_pos, pos)
-- Take position when moving to left if cursor is strictly on right.
-- This will lead to updating `res_pos` until the rightmost such position.
to_left = compare == '>' and dir == 'left'
-- Take position when moving to right if cursor is strictly on left.
-- This will update result only once leading to the leftmost such position.
to_right = res_pos == nil and compare == '<' and dir == 'right'
if to_left or to_right then
res_pos = pos
end
end
res_pos = res_pos or (dir == 'right' and pos_array[1] or pos_array[#pos_array])
vim.api.nvim_win_set_cursor(0, { res_pos.line, res_pos.col - 1 })
end
-- Work with user input -------------------------------------------------------
function H.notify(msg)
vim.notify(string.format('(mini.surround) %s', msg))
end
function H.user_surround_id(sur_type)
-- Get from user single character surrounding identifier
-- Helper message needs to depend on surrounding type to work better in
-- 'replace' case: when input surrounding was entered before needing a
-- message but output wasn't. If this is a simple boolean, there will be two
-- consecutive messages (even if first one already is not needed).
H.needs_help_msg[sur_type] = true
vim.defer_fn(function()
if not H.needs_help_msg[sur_type] then
return
end
local msg = string.format('Enter %s surrounding identifier (single character) ', sur_type)
H.notify(msg)
end, 1000)
local char = vim.fn.getchar()
H.needs_help_msg = {}
-- Terminate if input is `<Esc>`
if char == 27 then
return nil
end
if type(char) == 'number' then
char = vim.fn.nr2char(char)
end
if char:find('^[%w%p%s]$') == nil then
H.notify([[Input must be single character: alphanumeric, punctuation, or space.]])
return nil
end
return char
end
function H.user_input(msg, text)
return vim.fn.input('(mini.surround) ' .. msg .. ': ', text or '')
end
-- Work with line parts and text ----------------------------------------------
-- Line part - table with fields `line`, `from`, `to`. Represent part of line
-- from `from` character (inclusive) to `to` character (inclusive).
function H.new_linepart(pos_left, pos_right)
if pos_left.line ~= pos_right.line then
H.notify('Positions span over multiple lines.')
return nil
end
return { line = pos_left.line, from = pos_left.col, to = pos_right.col }
end
function H.linepart_to_pos_table(linepart)
local res = { { line = linepart.line, col = linepart.from } }
if linepart.from ~= linepart.to then
table.insert(res, { line = linepart.line, col = linepart.to })
end
return res
end
function H.delete_linepart(linepart)
local line = vim.fn.getline(linepart.line)
local new_line = line:sub(1, linepart.from - 1) .. line:sub(linepart.to + 1)
vim.fn.setline(linepart.line, new_line)
end
function H.insert_into_line(line_num, col, text)
-- Important to remember when working with multibyte characters: `col` here
-- represents byte index, not character
local line = vim.fn.getline(line_num)
local new_line = line:sub(1, col - 1) .. text .. line:sub(col)
vim.fn.setline(line_num, new_line)
end
-- Work with regular expressions ----------------------------------------------
-- Find the smallest (with the smallest width) covering (left and right offsets
-- in `line`) which inclused `offset` and within which `pattern` is matched.
-- Output is a table with two numbers (or `nil` in case of no covering match):
-- indexes of left and right parts of match. They have two properties:
-- - `left <= offset <= right`.
-- - `line:sub(left, right)` matches `'^' .. pattern .. '$'`.
function H.find_smallest_covering(line, pattern, offset)
local left, right, match_left, match_right
local stop = false
local init = 1
while not stop do
match_left, match_right = line:find(pattern, init)
if (match_left == nil) or (match_left > offset) then
-- Stop if first match is gone over `offset` to the right
stop = true
elseif match_right < offset then
-- Try find covering match. Originally this was `init = math.max(init +
-- 1, match_right)`. Generally, this works fine, but there is an edge
-- case with tags. Consider example: '<a>hello<b>world</a></b>' and
-- cursor inside '</b>'. First match is '<a>...</a>'. It doesn't cover
-- cursor, this branch is
-- executed. If move to `match_right`, next iteration will match inside
-- '></b>' and will find no match.
-- This increases execution time, but tolerably so. On the plus side,
-- this edge case currently gives wrong result even in 'vim-sandwich' :)
init = match_left + 1
else
-- Successful match: match_left <= offset <= match_right
-- Update result only if current has smaller width. This ensures
-- "smallest width" condition. Useful when pattern is something like
-- `".-"` and `line = '"a"aa"', offset = 3`.
if (left == nil) or (match_right - match_left < right - left) then
left, right = match_left, match_right
end
-- Try find smaller match
init = match_left + 1
end
end
if left == nil then
return nil
end
-- Try make match even smaller. Can happen if there is `+` flag at the end.
-- For example `line = '((()))', pattern = '%(.-%)+', offset = 3`.
local line_pattern = '^' .. pattern .. '$'
while left < right and line:sub(left, right - 1):find(line_pattern) do
right = right - 1
end
return { left = left, right = right }
end
-- Extend covering to capture possible whole groups with count modifiers.
-- Primar usage is to match whole function call with pattern
-- `[%w_%.]+%b()`.
--
-- Example:
-- `covering = {left = 4, right = 10}, line = '(aaa(b()b))',
-- pattern = '%g+%b()', direction = 'left'` should return
-- `{left = 2, right = 10}`.
--
-- NOTE: when used for pattern without count modifiers, can remove "smallest
-- width" property. For example:
-- `covering = {left = 2, right = 5}, line = '((()))',
-- pattern = '%(%(.-%)%)', direction = 'left'`
function H.extend_covering(covering, line, pattern, direction)
local left, right = covering.left, covering.right
local line_pattern = '^' .. pattern .. '$'
local n = line:len()
local is_matched = function(l, r)
return l >= 1 and r <= n and line:sub(l, r):find(line_pattern) ~= nil
end
if direction ~= 'right' then
while is_matched(left - 1, right) do
left = left - 1
end
end
if direction ~= 'left' then
while is_matched(left, right + 1) do
right = right + 1
end
end
return { left = left, right = right }
end
-- Work with cursor neighborhood ----------------------------------------------
function H.get_cursor_neighborhood(n_neighbors)
-- Cursor position
local cur_pos = vim.api.nvim_win_get_cursor(0)
-- Convert from 0-based column to 1-based
cur_pos = { line = cur_pos[1], col = cur_pos[2] + 1 }
-- '2d neighborhood': position is determined by line and column
local line_start = math.max(1, cur_pos.line - n_neighbors)
local line_end = math.min(vim.api.nvim_buf_line_count(0), cur_pos.line + n_neighbors)
local neigh2d = vim.api.nvim_buf_get_lines(0, line_start - 1, line_end, false)
-- Append 'newline' character to distinguish between lines in 1d case. This
-- is crucial to not allow detecting surrounding spanning several lines
for k, v in pairs(neigh2d) do
neigh2d[k] = v .. '\n'
end
-- '1d neighborhood': position is determined by offset from start
local neigh1d = table.concat(neigh2d, '')
-- Convert from buffer position to 1d offset
local pos_to_offset = function(pos)
local line_num = line_start
local offset = 0
while line_num < pos.line do
offset = offset + neigh2d[line_num - line_start + 1]:len()
line_num = line_num + 1
end
return offset + pos.col
end
-- Convert from 1d offset to buffer position
local offset_to_pos = function(offset)
local line_num = 1
local line_offset = 0
while line_num <= #neigh2d and line_offset + neigh2d[line_num]:len() < offset do
line_offset = line_offset + neigh2d[line_num]:len()
line_num = line_num + 1
end
return { line = line_start + line_num - 1, col = offset - line_offset }
end
return {
cursor_pos = cur_pos,
['1d'] = neigh1d,
['2d'] = neigh2d,
pos_to_offset = pos_to_offset,
offset_to_pos = offset_to_pos,
}
end
-- Get surround information ---------------------------------------------------
---@param sur_type string One of 'input' or 'output'
---@private
function H.get_surround_info(sur_type, use_cache)
local res
-- Try using cache
if use_cache then
res = H.cache[sur_type]
if res ~= nil then
return res
end
end
-- Prompt user to enter identifier of surrounding
local char = H.user_surround_id(sur_type)
-- Compute surround info
-- Return `nil` in case of a bad identifier
if char == nil then
return nil
end
-- Handle special cases first
if char == 'f' then
res = H.special_funcall(sur_type)
elseif char == 'i' then
res = H.special_interactive(sur_type)
elseif char == 't' then
res = H.special_tag(sur_type)
else
res = H.surroundings[char]
end
-- Do nothing if supplied nothing
if res == nil then
return nil
end
-- Add identifier
res.id = char
-- Cache result
if use_cache then
H.cache[sur_type] = res
end
return res
end
function H.special_funcall(sur_type)
-- Differentiate input and output because input doesn't need user action
if sur_type == 'input' then
-- Allowed symbols followed by a balanced parenthesis.
-- Can't use `%g` instead of allowed characters because of possible
-- '[(fun(10))]' case
return {
find = string.format('%s%%b()', MiniSurround.config.funname_pattern),
extract = string.format('^(%s%%().*(%%))$', MiniSurround.config.funname_pattern),
}
else
local fun_name = H.user_input('Function name')
-- Don't add anything if user supplied empty string (or hit `<Esc>`)
if fun_name == '' then
return nil
end
return { left = fun_name .. '(', right = ')' }
end
end
function H.special_interactive(sur_type)
-- Prompt for surroundings. Empty surrounding is not allowed for input.
local left = H.user_input('Left surrounding')
if sur_type == 'input' and left == '' then
return nil
end
local right = H.user_input('Right surrounding')
if sur_type == 'input' and right == '' then
return nil
end
local left_esc, right_esc = vim.pesc(left), vim.pesc(right)
local find = string.format('%s.-%s', left_esc, right_esc)
local extract = string.format('^(%s).-(%s)$', left_esc, right_esc)
return { find = find, extract = extract, left = left, right = right }
end
function H.special_tag(sur_type)
-- Differentiate input and output because input doesn't need user action
if sur_type == 'input' then
-- NOTEs:
-- - Here `%f[^%w]` denotes 'end of word' and is needed to capture whole
-- tag id. This is needed to not match in case '<ab></a>'.
-- - This approach won't match in the end of 'self nested' tags like
-- '<a>_<a>_</a>_</a>'.
-- - Having group capture and backreference in 'find' pattern increases
-- execution time. This is mostly visible when searching in a very big
-- '1d neighborhood'.
return { find = '<(%a%w*)%f[^%w][^>]->.-</%1>', extract = '^(<.->).*(</[^/]->)$' }
else
local tag_name = H.user_input('Tag name')
-- Don't add anything if user supplied empty string (or hit `<Esc>`)
if tag_name == '' then
return nil
end
return { left = '<' .. tag_name .. '>', right = '</' .. tag_name .. '>' }
end
end
-- Find surrounding in neighborhood -------------------------------------------
function H.find_surrounding_in_neighborhood(surround_info, n_neighbors)
local neigh = H.get_cursor_neighborhood(n_neighbors)
local cur_offset = neigh.pos_to_offset(neigh.cursor_pos)
-- Find covering of surrounding
local covering = H.find_smallest_covering(neigh['1d'], surround_info.find, cur_offset)
if covering == nil then
return nil
end
-- Tweak covering for function call surrounding
if surround_info.id == 'f' then
covering = H.extend_covering(covering, neigh['1d'], surround_info.find, 'left')
end
local substring = neigh['1d']:sub(covering.left, covering.right)
-- Compute lineparts for left and right surroundings
-- If there is no `extract` pattern, extract one character from start and end
local extract = surround_info.extract or '^(.).*(.)$'
local left, right = substring:match(extract)
local l, r = covering.left, covering.right
local left_from, left_to = neigh.offset_to_pos(l), neigh.offset_to_pos(l + left:len() - 1)
local right_from, right_to = neigh.offset_to_pos(r - right:len() + 1), neigh.offset_to_pos(r)
local left_linepart = H.new_linepart(left_from, left_to)
if left_linepart == nil then
return nil
end
local right_linepart = H.new_linepart(right_from, right_to)
if right_linepart == nil then
return nil
end
return { left = left_linepart, right = right_linepart }
end
-- Utilities ------------------------------------------------------------------
function H.keymap(mode, keys, cmd, opts)
if keys == '' then
return
end
vim.api.nvim_set_keymap(mode, keys, cmd, opts)
end
return MiniSurround