unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob 08b03d5666a8216369d707f28a8fe1bacf92f597 23654 bytes (raw)
name: lisp/progmodes/c-ts-mode.el 	 # note: path name is non-authoritative(*)

  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
 
;;; c-ts-mode.el --- tree-sitter support for C and C++  -*- lexical-binding: t; -*-

;; Copyright (C) 2022 Free Software Foundation, Inc.

;; Author     : Theodor Thornhill <theo@thornhill.no>
;; Maintainer : Theodor Thornhill <theo@thornhill.no>
;; Created    : November 2022
;; Keywords   : c c++ cpp languages tree-sitter

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:
;;

;;; Code:

(require 'treesit)
(eval-when-compile (require 'rx))

(declare-function treesit-parser-create "treesit.c")
(declare-function treesit-induce-sparse-tree "treesit.c")
(declare-function treesit-node-parent "treesit.c")
(declare-function treesit-node-start "treesit.c")
(declare-function treesit-node-end "treesit.c")
(declare-function treesit-node-child "treesit.c")
(declare-function treesit-node-child-by-field-name "treesit.c")
(declare-function treesit-node-type "treesit.c")

(defcustom c-ts-mode-indent-offset 2
  "Number of spaces for each indentation step in `c-ts-mode'."
  :version "29.1"
  :type 'integer
  :safe 'integerp
  :group 'c)

(defcustom c-ts-mode-indent-style 'gnu
  "Style used for indentation.

The selected style could be one of GNU, K&R, LINUX or BSD.  If
one of the supplied styles doesn't suffice a function could be
set instead.  This function is expected return a list that
follows the form of `treesit-simple-indent-rules'."
  :version "29.1"
  :type '(choice (symbol :tag "Gnu" 'gnu)
                 (symbol :tag "K&R" 'k&r)
                 (symbol :tag "Linux" 'linux)
                 (symbol :tag "BSD" 'bsd)
                 (function :tag "A function for user customized style" ignore))
  :group 'c)

(defvar c-ts-mode--syntax-table
  (let ((table (make-syntax-table)))
    ;; Taken from the cc-langs version
    (modify-syntax-entry ?_  "_"     table)
    (modify-syntax-entry ?\\ "\\"    table)
    (modify-syntax-entry ?+  "."     table)
    (modify-syntax-entry ?-  "."     table)
    (modify-syntax-entry ?=  "."     table)
    (modify-syntax-entry ?%  "."     table)
    (modify-syntax-entry ?<  "."     table)
    (modify-syntax-entry ?>  "."     table)
    (modify-syntax-entry ?&  "."     table)
    (modify-syntax-entry ?|  "."     table)
    (modify-syntax-entry ?\' "\""    table)
    (modify-syntax-entry ?\240 "."   table)
    (modify-syntax-entry ?/  ". 124b" table)
    (modify-syntax-entry ?*  ". 23"   table)
    table)
  "Syntax table for `c-ts-mode'.")

(defun c-ts-mode--indent-styles (mode)
  "Indent rules supported by `c-ts-mode'.
MODE is either `c' or `cpp'."
  (let ((common
         `(((parent-is "translation_unit") parent-bol 0)
           ((node-is ")") parent 1)
           ((node-is "]") parent-bol 0)
           ((node-is "}") (and parent parent-bol) 0)
           ((node-is "else") parent-bol 0)
           ((node-is "case") parent-bol 0)
           ((node-is "preproc_arg") no-indent)
           ((and (parent-is "comment") comment-end) comment-start -1)
           ((parent-is "comment") comment-start-skip 0)
           ((node-is "labeled_statement") parent-bol 0)
           ((parent-is "labeled_statement") parent-bol c-ts-mode-indent-offset)
           ((match "preproc_ifdef" "compound_statement") point-min 0)
           ((match "#endif" "preproc_ifdef") point-min 0)
           ((match "preproc_if" "compound_statement") point-min 0)
           ((match "#endif" "preproc_if") point-min 0)
           ((match "preproc_function_def" "compound_statement") point-min 0)
           ((match "preproc_call" "compound_statement") point-min 0)
           ((parent-is "compound_statement") (and parent parent-bol) c-ts-mode-indent-offset)
           ((parent-is "function_definition") parent-bol 0)
           ((parent-is "conditional_expression") first-sibling 0)
           ((parent-is "assignment_expression") parent-bol c-ts-mode-indent-offset)
           ((parent-is "comma_expression") first-sibling 0)
           ((parent-is "init_declarator") parent-bol c-ts-mode-indent-offset)
           ((parent-is "parenthesized_expression") first-sibling 1)
           ((parent-is "argument_list") first-sibling 1)
           ((parent-is "parameter_list") first-sibling 1)
           ((parent-is "binary_expression") parent 0)
           ((query "(for_statement initializer: (_) @indent)") parent-bol 5)
           ((query "(for_statement condition: (_) @indent)") parent-bol 5)
           ((query "(for_statement update: (_) @indent)") parent-bol 5)
           ((query "(call_expression arguments: (_) @indent)") parent c-ts-mode-indent-offset)
           ((parent-is "call_expression") parent 0)
           ((parent-is "enumerator_list") parent-bol c-ts-mode-indent-offset)
           ((parent-is "field_declaration_list") parent-bol c-ts-mode-indent-offset)
           ((parent-is "initializer_list") parent-bol c-ts-mode-indent-offset)
           ((parent-is "if_statement") parent-bol c-ts-mode-indent-offset)
           ((parent-is "for_statement") parent-bol c-ts-mode-indent-offset)
           ((parent-is "while_statement") parent-bol c-ts-mode-indent-offset)
           ((parent-is "switch_statement") parent-bol c-ts-mode-indent-offset)
           ((parent-is "case_statement") parent-bol c-ts-mode-indent-offset)
           ((parent-is "do_statement") parent-bol c-ts-mode-indent-offset)
           ,@(when (eq mode 'cpp)
               `(((node-is "field_initializer_list") parent-bol ,(* c-ts-mode-indent-offset 2)))))))
    `((gnu
       ;; Prepend rules to set highest priority
       ((match "while" "do_statement") parent 0)
       ,@common)
      (k&r ,@common)
      (linux ,@common)
      (bsd
       ((parent-is "if_statement") parent-bol 0)
       ((parent-is "for_statement") parent-bol 0)
       ((parent-is "while_statement") parent-bol 0)
       ((parent-is "switch_statement") parent-bol 0)
       ((parent-is "case_statement") parent-bol 0)
       ((parent-is "do_statement") parent-bol 0)
       ,@common))))

(defun c-ts-mode--set-indent-style (mode)
  "Helper function to set indentation style.
MODE is either `c' or `cpp'."
  (let ((style
         (if (functionp c-ts-mode-indent-style)
             (funcall c-ts-mode-indent-style)
           (pcase c-ts-mode-indent-style
             ('gnu   (alist-get 'gnu (c-ts-mode--indent-styles mode)))
             ('k&r   (alist-get 'k&r (c-ts-mode--indent-styles mode)))
             ('bsd   (alist-get 'bsd (c-ts-mode--indent-styles mode)))
             ('linux (alist-get 'linux (c-ts-mode--indent-styles mode)))))))
    `((,mode ,@style))))

(defvar c-ts-mode--preproc-keywords
  '("#define" "#if" "#ifdef" "#ifndef"
    "#else" "#elif" "#endif" "#include")
  "C/C++ keywords for tree-sitter font-locking.")

(defun c-ts-mode--keywords (mode)
  "C/C++ keywords for tree-sitter font-locking.
MODE is either `c' or `cpp'."
  (let ((c-keywords
         '("break" "case" "const" "continue"
           "default" "do" "else" "enum"
           "extern" "for" "goto" "if" "inline"
           "register" "return"
           "sizeof" "static" "struct"
           "switch" "typedef" "union"
           "volatile" "while")))
    (if (eq mode 'cpp)
        (append c-keywords
                '("and" "and_eq" "bitand" "bitor"
                  "catch" "class" "co_await" "co_return"
                  "co_yield" "compl" "concept" "consteval"
                  "constexpr" "constinit" "decltype" "delete"
                  "explicit" "final" "friend"
                  "mutable" "namespace" "new" "noexcept"
                  "not" "not_eq" "operator" "or"
                  "or_eq" "override" "private" "protected"
                  "public" "requires" "template" "throw"
                  "try" "typename" "using" "virtual"
                  "xor" "xor_eq"))
      (append '("auto") c-keywords))))

(defvar c-ts-mode--type-keywords
  '("long" "short" "signed" "unsigned")
  "Keywords that should be considered as part of a type.")

(defvar c-ts-mode--operators
  '("=" "-" "*" "/" "+" "%" "~" "|" "&" "^" "<<" ">>" "->"
    "." "<" "<=" ">=" ">" "==" "!=" "!" "&&" "||" "-="
    "+=" "*=" "/=" "%=" "|=" "&=" "^=" ">>=" "<<=" "--" "++")
  "C/C++ operators for tree-sitter font-locking.")

(defun c-ts-mode--font-lock-settings (mode)
  "Tree-sitter font-lock settings.
MODE is either `c' or `cpp'."
  (treesit-font-lock-rules
   :language mode
   :feature 'comment
   `((comment) @font-lock-comment-face
     (comment) @contextual)

   :language mode
   :feature 'preprocessor
   `((preproc_directive) @font-lock-preprocessor-face

     (preproc_def
      name: (identifier) @font-lock-variable-name-face)

     (preproc_ifdef
      name: (identifier) @font-lock-variable-name-face)

     (preproc_function_def
      name: (identifier) @font-lock-function-name-face)

     (preproc_params
      (identifier) @font-lock-variable-name-face)

     (preproc_defined) @font-lock-preprocessor-face
     (preproc_defined (identifier) @font-lock-variable-name-face)
     [,@c-ts-mode--preproc-keywords] @font-lock-preprocessor-face)

   :language mode
   :feature 'constant
   `((true) @font-lock-constant-face
     (false) @font-lock-constant-face
     (null) @font-lock-constant-face
     ,@(when (eq mode 'cpp)
         '((this) @font-lock-constant-face)))

   :language mode
   :feature 'keyword
   `([,@(c-ts-mode--keywords mode)] @font-lock-keyword-face
     ,@(when (eq mode 'cpp)
         '((auto) @font-lock-keyword-face)))

   :language mode
   :feature 'operator
   `([,@c-ts-mode--operators] @font-lock-operator-face
     "!" @font-lock-negation-char-face)

   :language mode
   :feature 'string
   `((string_literal) @font-lock-string-face
     (system_lib_string) @font-lock-string-face)

   :language mode
   :feature 'literal
   `((number_literal) @font-lock-number-face
     (char_literal) @font-lock-constant-face)

   :language mode
   :feature 'type
   `((primitive_type) @font-lock-type-face
     (type_identifier) @font-lock-type-face
     (sized_type_specifier) @font-lock-type-face
     ,@(when (eq mode 'cpp)
         '((type_qualifier) @font-lock-type-face

           (qualified_identifier
            scope: (namespace_identifier) @font-lock-type-face)

           (operator_cast) type: (type_identifier) @font-lock-type-face))
     [,@c-ts-mode--type-keywords] @font-lock-type-face)

   :language mode
   :feature 'definition
   ;; Highlights identifiers in declarations.
   `((declaration
      declarator: (_) @c-ts-mode--fontify-declarator)

     (field_declaration
      declarator: (_) @c-ts-mode--fontify-declarator)

     (function_definition
      declarator: (_) @c-ts-mode--fontify-declarator))

   ;; Should we highlight identifiers in the parameter list?
   ;; (parameter_declaration
   ;;  declarator: (_) @c-ts-mode--fontify-declarator))

   :language mode
   :feature 'assignment
   ;; TODO: Recursively highlight identifiers in parenthesized
   ;; expressions, see `c-ts-mode--fontify-struct-declarator' for
   ;; inspiration.
   '((assignment_expression
      left: (identifier) @font-lock-variable-name-face)
     (assignment_expression
      left: (field_expression field: (_) @font-lock-property-face))
     (assignment_expression
      left: (pointer_expression
             (identifier) @font-lock-variable-name-face))
     (assignment_expression
      left: (subscript_expression
             (identifier) @font-lock-variable-name-face))
     (init_declarator declarator: (_) @c-ts-mode--fontify-declarator))

   :language mode
   :feature 'function
   '((call_expression
      function: (identifier) @font-lock-function-name-face))

   :language mode
   :feature 'variable
   '((identifier) @c-ts-mode--fontify-variable)

   :language mode
   :feature 'label
   '((labeled_statement
      label: (statement_identifier) @font-lock-constant-face))

   :language mode
   :feature 'error
   '((ERROR) @c-ts-mode--fontify-error)

   :feature 'escape-sequence
   :language mode
   :override t
   '((escape_sequence) @font-lock-escape-face)

   :language mode
   :feature 'property
   '((field_identifier) @font-lock-property-face
     (enumerator
      name: (identifier) @font-lock-property-face))

   :language mode
   :feature 'bracket
   '((["(" ")" "[" "]" "{" "}"]) @font-lock-bracket-face)

   :language mode
   :feature 'delimiter
   '((["," ":" ";"]) @font-lock-delimiter-face)

   :language mode
   :feature 'emacs-devel
   :override t
   '(((call_expression
       (call_expression function: (identifier) @fn)
       @c-ts-mode--fontify-defun)
      (:match "^DEFUN$" @fn)))))

(defun c-ts-mode--fontify-declarator (node override start end &rest args)
  "Fontify a declarator (whatever under the \"declarator\" field).
For NODE, OVERRIDE, START, END, and ARGS, see
`treesit-font-lock-rules'."
  (pcase (treesit-node-type node)
    ((or "attributed_declarator" "parenthesized_declarator")
     (apply #'c-ts-mode--fontify-declarator
            (treesit-node-child node 0 t) override start end args))
    ("pointer_declarator"
     (apply #'c-ts-mode--fontify-declarator
            (treesit-node-child node -1) override start end args))
    ((or "function_declarator" "array_declarator" "init_declarator")
     (apply #'c-ts-mode--fontify-declarator
            (treesit-node-child-by-field-name node "declarator")
            override start end args))
    ((or "identifier" "field_identifier")
     (treesit-fontify-with-override
      (treesit-node-start node) (treesit-node-end node)
      (pcase (treesit-node-type (treesit-node-parent node))
        ("function_declarator" 'font-lock-function-name-face)
        (_ 'font-lock-variable-name-face))
      override start end))))

(defun c-ts-mode--fontify-variable (node override start end &rest _)
  "Fontify an identifier node if it is a variable.
Don't fontify if it is a function identifier.  For NODE,
OVERRIDE, START, END, and ARGS, see `treesit-font-lock-rules'."
  (when (not (equal (treesit-node-type
                     (treesit-node-parent node))
                    "call_expression"))
    (treesit-fontify-with-override
     (treesit-node-start node) (treesit-node-end node)
     'font-lock-variable-name-face override start end)))

(defun c-ts-mode--fontify-defun (node override start end &rest _)
  "Correctly fontify the DEFUN macro.
For NODE, OVERRIDE, START, and END, see
`treesit-font-lock-rules'.  The captured NODE is a
call_expression where DEFUN is the function.

This function corrects the fontification on the colon in
\"doc:\", and the parameter list."
  (let* ((parent (treesit-node-parent node))
         ;; ARG-LIST-1 and 2 are like this:
         ;;
         ;; DEFUN (ARG-LIST-1)
         ;; (ARG-LIST-2)
         (arg-list-1 (treesit-node-children
                      (treesit-node-child-by-field-name
                       node "arguments")))
         ;; ARG-LIST-2 is the
         (arg-list-2 (treesit-node-children
                      (treesit-node-child-by-field-name
                       parent "arguments") t)))
    ;; Fix the colon.
    (dolist (node arg-list-1)
      (when (equal (treesit-node-text node t) ":")
        (treesit-fontify-with-override
         (treesit-node-start node) (treesit-node-end node)
         'default override start end)))
    ;; Fix the parameter list.
    (while arg-list-2
      (let ((type (and arg-list-2 (pop arg-list-2)))
            (arg (and arg-list-2 (pop arg-list-2))))
        (when type
          (treesit-fontify-with-override
           (treesit-node-start type) (treesit-node-end type)
           'font-lock-type-face override start end))
        (when arg
          (treesit-fontify-with-override
           (treesit-node-start arg) (treesit-node-end arg)
           'default override start end))))))

(defun c-ts-mode--fontify-error (node override start end &rest _)
  "Fontify the error nodes.
For NODE, OVERRIDE, START, and END, see
`treesit-font-lock-rules'."
  (let ((parent (treesit-node-parent node))
        (child (treesit-node-child node 0)))
    (treesit-fontify-with-override
     (treesit-node-start node) (treesit-node-end node)
     (cond
      ;; This matches the case MACRO(struct a, b, c)
      ;; where struct is seen as error.
      ((and (equal (treesit-node-type child) "identifier")
            (equal (treesit-node-type parent) "argument_list")
            (member (treesit-node-text child)
                    '("struct" "long" "short" "enum" "union")))
       'font-lock-keyword-face)
      (t 'font-lock-warning-face))
     override start end)))

(defun c-ts-mode--imenu-1 (node)
  "Helper for `c-ts-mode--imenu'.
Find string representation for NODE and set marker, then recurse
the subtrees."
  (let* ((ts-node (car node))
         (subtrees (mapcan #'c-ts-mode--imenu-1 (cdr node)))
         (name (when ts-node
                 (treesit-node-text
                  (pcase (treesit-node-type ts-node)
                    ("function_definition"
                     (treesit-node-child-by-field-name
                      (treesit-node-child-by-field-name
                       ts-node "declarator")
                      "declarator"))
                    ("declaration"
                     (let ((child (treesit-node-child ts-node -1 t)))
                       (pcase (treesit-node-type child)
                         ("identifier" child)
                         (_ (treesit-node-child-by-field-name
                             child "declarator")))))
                    ("struct_specifier"
                     (treesit-node-child-by-field-name
                      ts-node "name"))))))
         (marker (when ts-node
                   (set-marker (make-marker)
                               (treesit-node-start ts-node)))))
    (cond
     ;; A struct_specifier could be inside a parameter list, another
     ;; struct definition, a variable declaration, a function
     ;; declaration.  In those cases we don't include it.
     ((string-match-p
       (rx (or "parameter_declaration" "field_declaration"
               "declaration" "function_definition"))
       (or (treesit-node-type (treesit-node-parent ts-node))
           ""))
      nil)
     ;; Ignore function local variable declarations.
     ((and (equal (treesit-node-type ts-node) "declaration")
           (not (equal (treesit-node-type (treesit-node-parent ts-node))
                       "translation_unit")))
      nil)
     ((or (null ts-node) (null name)) subtrees)
     (subtrees
      `((,name ,(cons name marker) ,@subtrees)))
     (t
      `((,name . ,marker))))))

(defun c-ts-mode--imenu ()
  "Return Imenu alist for the current buffer."
  (let* ((node (treesit-buffer-root-node))
         (func-tree (treesit-induce-sparse-tree
                     node "^function_definition$" nil 1000))
         (var-tree (treesit-induce-sparse-tree
                    node "^declaration$" nil 1000))
         (struct-tree (treesit-induce-sparse-tree
                       node "^struct_specifier$" nil 1000))
         (func-index (c-ts-mode--imenu-1 func-tree))
         (var-index (c-ts-mode--imenu-1 var-tree))
         (struct-index (c-ts-mode--imenu-1 struct-tree)))
    (append
     (when struct-index `(("Struct" . ,struct-index)))
     (when var-index `(("Variable" . ,var-index)))
     (when func-index `(("Function" . ,func-index))))))

(defun c-ts-mode--end-of-defun ()
  "`end-of-defun-function' of `c-ts-mode'."
  ;; A struct/enum/union_specifier node doesn't include the ; at the
  ;; end, so we manually skip it.
  (treesit-end-of-defun)
  (when (looking-at (rx (* " ") ";"))
    (goto-char (match-end 0))
    ;; This part is copied from `end-of-defun'.
    (unless (bolp)
      (skip-chars-forward " \t")
      (if (looking-at "\\s<\\|\n")
	  (forward-line 1)))))

;;;###autoload
(define-derived-mode c-ts-base-mode prog-mode "C"
  "Major mode for editing C, powered by tree-sitter."
  :syntax-table c-ts-mode--syntax-table

  ;; Navigation.
  (setq-local treesit-defun-type-regexp
              (regexp-opt '("function_definition"
                            "type_definition"
                            "struct_specifier"
                            "enum_specifier"
                            "union_specifier")))

  ;; Nodes like struct/enum/union_specifier can appear in
  ;; function_definitions, so we need to find the top-level node.
  (setq-local treesit-defun-prefer-top-level t)

  ;; Indent.
  (when (eq c-ts-mode-indent-style 'linux)
    (setq-local indent-tabs-mode t))

  ;; Electric
  (setq-local electric-indent-chars
              (append "{}():;," electric-indent-chars))

  ;; Imenu.
  (setq-local imenu-create-index-function #'c-ts-mode--imenu)
  (setq-local which-func-functions nil)

  (setq-local treesit-font-lock-feature-list
              '(( comment definition)
                ( keyword preprocessor string type)
                ( assignment constant escape-sequence label literal property )
                ( bracket delimiter error function operator variable))))

;;;###autoload
(define-derived-mode c-ts-mode c-ts-base-mode "C"
  "Major mode for editing C, powered by tree-sitter."
  :group 'c

  (unless (treesit-ready-p 'c)
    (error "Tree-sitter for C isn't available"))

  (treesit-parser-create 'c)

  ;; Comments.
  (setq-local comment-start "/* ")
  (setq-local comment-end " */")
  (setq-local comment-start-skip (rx (or (seq "/" (+ "/"))
                                         (seq "/" (+ "*")))
                                     (* (syntax whitespace))))
  (setq-local comment-end-skip
              (rx (* (syntax whitespace))
                  (group (or (syntax comment-end)
                             (seq (+ "*") "/")))))

  (setq-local treesit-simple-indent-rules
              (c-ts-mode--set-indent-style 'c))

  ;; Font-lock.
  (setq-local treesit-font-lock-settings (c-ts-mode--font-lock-settings 'c))

  (treesit-major-mode-setup)

  ;; Override default value of end-of-defun-function set by
  ;; `treesit-major-mode-setup'.
  (setq-local end-of-defun-function #'c-ts-mode--end-of-defun))

;;;###autoload
(define-derived-mode c++-ts-mode c-ts-base-mode "C++"
  "Major mode for editing C++, powered by tree-sitter."
  :group 'c++

  (unless (treesit-ready-p 'cpp)
    (error "Tree-sitter for C++ isn't available"))

  ;; Comments.
  (setq-local comment-start "// ")
  (setq-local comment-end "")
  (setq-local comment-start-skip (rx (or (seq "/" (+ "/"))
                                         (seq "/" (+ "*")))
                                     (* (syntax whitespace))))
  (setq-local comment-end-skip
              (rx (* (syntax whitespace))
                  (group (or (syntax comment-end)
                             (seq (+ "*") "/")))))

  (treesit-parser-create 'cpp)

  (setq-local treesit-simple-indent-rules
              (c-ts-mode--set-indent-style 'cpp))

  ;; Font-lock.
  (setq-local treesit-font-lock-settings (c-ts-mode--font-lock-settings 'cpp))

  (treesit-major-mode-setup)

  ;; Override default value of end-of-defun-function set by
  ;; `treesit-major-mode-setup'.
  (setq-local end-of-defun-function #'c-ts-mode--end-of-defun))

(provide 'c-ts-mode)

;;; c-ts-mode.el ends here

debug log:

solving 08b03d5666 ...
found 08b03d5666 in https://git.savannah.gnu.org/cgit/emacs.git

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).