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newcomment.el
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;;; newcomment.el --- (un)comment regions of buffers -*- lexical-binding: t -*-
;; Copyright (C) 1999-2023 Free Software Foundation, Inc.
;; Author: code extracted from Emacs-20's simple.el
;; Maintainer: Stefan Monnier <[email protected]>
;; Keywords: comment uncomment
;; Package: emacs
;; 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:
;; This library contains functions and variables for commenting and
;; uncommenting source code.
;; Prior to calling any `comment-*' function, you should ensure that
;; `comment-normalize-vars' is first called to set up the appropriate
;; variables; except for the `comment-*' commands, which call
;; `comment-normalize-vars' automatically as a subroutine.
;;; Bugs:
;; - boxed comments in Perl are not properly uncommented because they are
;; uncommented one-line at a time.
;; - nested comments in sgml-mode are not properly quoted.
;; - single-char nestable comment-start can only do the "\\s<+" stuff
;; if the corresponding closing marker happens to be right.
;; - uncomment-region with a numeric argument can render multichar
;; comment markers invalid.
;; - comment-indent or comment-region when called inside a comment
;; will happily break the surrounding comment.
;; - comment-quote-nested will not (un)quote properly all nested comment
;; markers if there are more than just comment-start and comment-end.
;; For example, in Pascal where {...*) and (*...} are possible.
;;; Todo:
;; - rebox.el-style refill.
;; - quantized steps in comment-alignment.
;; - try to align tail comments.
;; - check what c-comment-line-break-function has to say.
;; - spill auto-fill of comments onto the end of the next line.
;; - uncomment-region with a consp (for blocks) or somehow make the
;; deletion of continuation markers less dangerous.
;; - drop block-comment-<foo> unless it's really used.
;; - uncomment-region on a subpart of a comment.
;; - support gnu-style "multi-line with space in continue".
;; - somehow allow comment-dwim to use the region even if transient-mark-mode
;; is not turned on.
;; - when auto-filling a comment, try to move the comment to the left
;; rather than break it (if possible).
;; - sometimes default the comment-column to the same
;; one used on the preceding line(s).
;;; Code:
(eval-when-compile
(require 'subr-x))
;;;###autoload
(defalias 'indent-for-comment 'comment-indent)
;;;###autoload
(defalias 'set-comment-column 'comment-set-column)
;;;###autoload
(defalias 'kill-comment 'comment-kill)
;;;###autoload
(defalias 'indent-new-comment-line 'comment-indent-new-line)
(defgroup comment nil
"Indenting and filling of comments."
:prefix "comment-"
:version "21.1"
:group 'fill)
;; Autoload this to avoid warnings, since some major modes define it.
;;;###autoload
(defvar comment-use-syntax 'undecided
"Non-nil if syntax-tables can be used instead of regexps.
Can also be `undecided' which means that a somewhat expensive test will
be used to try to determine whether syntax-tables should be trusted
to understand comments or not in the given buffer.
Major modes should set this variable.")
(defcustom comment-fill-column nil
"Column to use for `comment-indent'. If nil, use `fill-column' instead."
:type '(choice (const nil) integer)
:group 'comment)
;;;###autoload
(defcustom comment-column 32
"Column to indent right-margin comments to.
Each mode may establish a different default value for this variable; you
can set the value for a particular mode using that mode's hook.
Comments might be indented to a different value in order not to go beyond
`comment-fill-column' or in order to align them with surrounding comments."
:type 'integer
:group 'comment)
(make-variable-buffer-local 'comment-column)
;;;###autoload
(put 'comment-column 'safe-local-variable 'integerp)
;;;###autoload
(defvar comment-start nil
"String to insert to start a new comment, or nil if no comment syntax.")
;;;###autoload
(put 'comment-start 'safe-local-variable 'string-or-null-p)
;;;###autoload
(defvar comment-start-skip nil
"Regexp to match the start of a comment plus everything up to its body.
If there are any \\(...\\) pairs and `comment-use-syntax' is nil,
the comment delimiter text is held to begin at the place matched
by the close of the first pair.")
;;;###autoload
(put 'comment-start-skip 'safe-local-variable 'stringp)
;;;###autoload
(defvar comment-end-skip nil
"Regexp to match the end of a comment plus everything back to its body.")
;;;###autoload
(put 'comment-end-skip 'safe-local-variable 'stringp)
;;;###autoload
(defvar comment-end (purecopy "")
"String to insert to end a new comment.
Should be an empty string if comments are terminated by end-of-line.")
;;;###autoload
(put 'comment-end 'safe-local-variable 'stringp)
;;;###autoload
(defvar comment-indent-function 'comment-indent-default
"Function to compute desired indentation for a comment.
This function is called with no args with point at the beginning
of the comment's starting delimiter and should return either the
desired column indentation, a range of acceptable
indentation (MIN . MAX), or nil.
If nil is returned, indentation is delegated to `indent-according-to-mode'.")
;;;###autoload
(defvar comment-insert-comment-function nil
"Function to insert a comment when a line doesn't contain one.
The function has no args.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
(defvar-local comment-combine-change-calls t
"If non-nil (the default), use `combine-change-calls' around
calls of `comment-region-function' and
`uncomment-region-function'. This Substitutes a single call to
each of the hooks `before-change-functions' and
`after-change-functions' in place of those hooks being called
for each individual buffer change.")
(defvar comment-region-function 'comment-region-default
"Function to comment a region.
Its args are the same as those of `comment-region', but BEG and END are
guaranteed to be correctly ordered. It is called within `save-excursion'.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
(defvar uncomment-region-function 'uncomment-region-default
"Function to uncomment a region.
Its args are the same as those of `uncomment-region', but BEG and END are
guaranteed to be correctly ordered. It is called within `save-excursion'.
Applicable at least in modes for languages like fixed-format Fortran where
comments always start in column zero.")
;; ?? never set
(defvar block-comment-start nil)
(defvar block-comment-end nil)
(defvar comment-quote-nested t
"Non-nil if nested comments should be quoted.
This should be locally set by each major mode if needed.")
(defvar comment-quote-nested-function #'comment-quote-nested-default
"Function to quote nested comments in a region.
It takes the same arguments as `comment-quote-nested-default',
and is called with the buffer narrowed to a single comment.")
(defvar comment-continue nil
"Continuation string to insert for multiline comments.
This string will be added at the beginning of each line except the very
first one when commenting a region with a commenting style that allows
comments to span several lines.
It should generally have the same length as `comment-start' in order to
preserve indentation.
If it is nil a value will be automatically derived from `comment-start'
by replacing its first character with a space.")
(defvar comment-add 0
"How many more comment chars should be inserted by `comment-region'.
This determines the default value of the numeric argument of `comment-region'.
The `plain' comment style doubles this value.
This should generally stay 0, except for a few modes like Lisp where
it is 1 so that regions are commented with two or three semi-colons.")
;;;###autoload
(defconst comment-styles
'((plain nil nil nil nil
"Start in column 0 (do not indent), as in Emacs-20")
(indent-or-triple nil nil nil multi-char
"Start in column 0, but only for single-char starters")
(indent nil nil nil t
"Full comment per line, ends not aligned")
(aligned nil t nil t
"Full comment per line, ends aligned")
(box nil t t t
"Full comment per line, ends aligned, + top and bottom")
(extra-line t nil t t
"One comment for all lines, end on a line by itself")
(multi-line t nil nil t
"One comment for all lines, end on last commented line")
(box-multi t t t t
"One comment for all lines, + top and bottom"))
"Comment region style definitions.
Each style is defined with a form (STYLE . (MULTI ALIGN EXTRA INDENT DOC)).
DOC should succinctly describe the style.
STYLE should be a mnemonic symbol.
MULTI specifies that comments are allowed to span multiple lines.
e.g. in C it comments regions as
/* blabla
* bli */
rather than
/* blabla */
/* bli */
if `comment-end' is empty, this has no effect.
ALIGN specifies that the `comment-end' markers should be aligned.
e.g. in C it comments regions as
/* blabla */
/* bli */
rather than
/* blabla */
/* bli */
if `comment-end' is empty, this has no effect, unless EXTRA is also set,
in which case the comment gets wrapped in a box.
EXTRA specifies that an extra line should be used before and after the
region to comment (to put the `comment-end' and `comment-start').
e.g. in C it comments regions as
/*
* blabla
* bli
*/
rather than
/* blabla
* bli */
if the comment style is not multi line, this has no effect, unless ALIGN
is also set, in which case the comment gets wrapped in a box.
INDENT specifies that the `comment-start' markers should not be put at the
left margin but at the current indentation of the region to comment.
If INDENT is `multi-char', that means indent multi-character
comment starters, but not one-character comment starters.")
;;;###autoload
(defcustom comment-style 'indent
"Style to be used for `comment-region'.
See `comment-styles' for a list of available styles."
:type (if (boundp 'comment-styles)
`(choice
,@(mapcar (lambda (s)
`(const :tag ,(format "%s: %s" (car s) (nth 5 s))
,(car s)))
comment-styles))
'symbol)
:version "23.1"
:group 'comment)
;;;###autoload
(defcustom comment-padding (purecopy " ")
"Padding string that `comment-region' puts between comment chars and text.
Can also be an integer which will be automatically turned into a string
of the corresponding number of spaces.
Extra spacing between the comment characters and the comment text
makes the comment easier to read. Default is 1. nil means 0."
:type '(choice string integer (const nil))
:group 'comment)
(defcustom comment-inline-offset 1
"Inline comments have to be preceded by at least this many spaces.
This is useful when style-conventions require a certain minimal offset.
Python's PEP8 for example recommends two spaces, so you could do:
\(add-hook \\='python-mode-hook
(lambda () (setq-local comment-inline-offset 2)))
See `comment-padding' for whole-line comments."
:version "24.3"
:type 'integer
:group 'comment)
;;;###autoload
(defcustom comment-multi-line nil
"Non-nil means `comment-indent-new-line' continues comments.
That is, it inserts no new terminator or starter.
This affects `auto-fill-mode', which is the main reason to
customize this variable.
It also affects \\[indent-new-comment-line]. However, if you want this
behavior for explicit filling, you might as well use \\[newline-and-indent]."
:type 'boolean
:safe #'booleanp
:group 'comment)
(defcustom comment-empty-lines nil
"If nil, `comment-region' does not comment out empty lines.
If t, it always comments out empty lines.
If `eol', it only comments out empty lines if comments are
terminated by the end of line (i.e., `comment-end' is empty)."
:type '(choice (const :tag "Never" nil)
(const :tag "Always" t)
(const :tag "EOL-terminated" eol))
:group 'comment)
;;;;
;;;; Helpers
;;;;
(defun comment-string-strip (str beforep afterp)
"Strip STR of any leading (if BEFOREP) and/or trailing (if AFTERP) space."
(string-match (concat "\\`" (if beforep "\\s-*")
"\\(.*?\\)" (if afterp "\\s-*\n?")
"\\'") str)
(match-string 1 str))
(defun comment-string-reverse (s)
"Return the mirror image of string S, without any trailing space."
(comment-string-strip (concat (nreverse (string-to-list s))) nil t))
;;;###autoload
(defun comment-normalize-vars (&optional noerror)
"Check and set up variables needed by other commenting functions.
All the `comment-*' commands call this function to set up various
variables, like `comment-start', to ensure that the commenting
functions work correctly. Lisp callers of any other `comment-*'
function should first call this function explicitly."
(unless (and (not comment-start) noerror)
(unless comment-start
(let ((cs (read-string "No comment syntax is defined. Use: ")))
(if (zerop (length cs))
(error "No comment syntax defined")
(setq-local comment-start cs)
(setq-local comment-start-skip cs))))
;; comment-use-syntax
(when (eq comment-use-syntax 'undecided)
(setq-local comment-use-syntax
(let ((st (syntax-table))
(cs comment-start)
(ce (if (string= "" comment-end) "\n" comment-end)))
;; Try to skip over a comment using forward-comment
;; to see if the syntax tables properly recognize it.
(with-temp-buffer
(set-syntax-table st)
(insert cs " hello " ce)
(goto-char (point-min))
(and (forward-comment 1) (eobp))))))
;; comment-padding
(unless comment-padding (setq comment-padding 0))
(when (integerp comment-padding)
(setq comment-padding (make-string comment-padding ? )))
;; comment markers
;;(setq comment-start (comment-string-strip comment-start t nil))
;;(setq comment-end (comment-string-strip comment-end nil t))
;; comment-continue
(unless (or comment-continue (string= comment-end ""))
(setq-local comment-continue
(concat (if (string-match "\\S-\\S-" comment-start) " " "|")
(substring comment-start 1)))
;; Hasn't been necessary yet.
;; (unless (string-match comment-start-skip comment-continue)
;; (kill-local-variable 'comment-continue))
)
;; comment-skip regexps
(unless (and comment-start-skip
;; In case comment-start has changed since last time.
(string-match comment-start-skip comment-start))
(setq-local comment-start-skip
(concat (unless (eq comment-use-syntax t)
;; `syntax-ppss' will detect escaping.
"\\(\\(^\\|[^\\\n]\\)\\(\\\\\\\\\\)*\\)")
"\\(?:\\s<+\\|"
(regexp-quote (comment-string-strip comment-start t t))
;; Let's not allow any \s- but only [ \t] since \n
;; might be both a comment-end marker and \s-.
"+\\)[ \t]*")))
(unless (and comment-end-skip
;; In case comment-end has changed since last time.
(string-match comment-end-skip
(if (string= "" comment-end) "\n" comment-end)))
(let ((ce (if (string= "" comment-end) "\n"
(comment-string-strip comment-end t t))))
(setq-local comment-end-skip
;; We use [ \t] rather than \s- because we don't want to
;; remove ^L in C mode when uncommenting.
(concat "[ \t]*\\(\\s>" (if comment-quote-nested "" "+")
"\\|" (regexp-quote (substring ce 0 1))
(if (and comment-quote-nested (<= (length ce) 1)) "" "+")
(regexp-quote (substring ce 1))
"\\)"))))))
(defun comment-quote-re (str unp)
(concat (regexp-quote (substring str 0 1))
"\\\\" (if unp "+" "*")
(regexp-quote (substring str 1))))
(defun comment-quote-nested (cs ce unp)
"Quote or unquote nested comments.
If UNP is non-nil, unquote nested comment markers."
(setq cs (comment-string-strip cs t t))
(setq ce (comment-string-strip ce t t))
(when (and comment-quote-nested
(> (length ce) 0))
(funcall comment-quote-nested-function cs ce unp)))
(defun comment-quote-nested-default (cs ce unp)
"Quote comment delimiters in the buffer.
It expects to be called with the buffer narrowed to a single comment.
It is used as a default for `comment-quote-nested-function'.
The arguments CS and CE are strings matching comment starting and
ending delimiters respectively.
If UNP is non-nil, comments are unquoted instead.
To quote the delimiters, a \\ is inserted after the first
character of CS or CE. If CE is a single character it will
change CE into !CS."
(let ((re (concat (comment-quote-re ce unp)
"\\|" (comment-quote-re cs unp))))
(goto-char (point-min))
(while (re-search-forward re nil t)
(goto-char (match-beginning 0))
(forward-char 1)
(if unp (delete-char 1) (insert "\\"))
(when (= (length ce) 1)
;; If the comment-end is a single char, adding a \ after that
;; "first" char won't deactivate it, so we turn such a CE
;; into !CS. I.e. for pascal, we turn } into !{
(if (not unp)
(when (string= (match-string 0) ce)
(replace-match (concat "!" cs) t t))
(when (and (< (point-min) (match-beginning 0))
(string= (buffer-substring (1- (match-beginning 0))
(1- (match-end 0)))
(concat "!" cs)))
(backward-char 2)
(delete-char (- (match-end 0) (match-beginning 0)))
(insert ce)))))))
;;;;
;;;; Navigation
;;;;
(defvar comment-use-global-state t
"Non-nil means that the global syntactic context is used.
More specifically, it means that `syntax-ppss' is used to find out whether
point is within a string or not. Major modes whose syntax is not faithfully
described by the syntax-tables (or where `font-lock-syntax-table' is radically
different from the main syntax table) can set this to nil,
then `syntax-ppss' cache won't be used in comment-related routines.")
(make-obsolete-variable 'comment-use-global-state 'comment-use-syntax "24.4")
(defun comment-search-forward (limit &optional noerror)
"Find a comment start between point and LIMIT.
Moves point to inside the comment and returns the position of the
comment-starter. If no comment is found, moves point to LIMIT
and raises an error or returns nil if NOERROR is non-nil.
Ensure that `comment-normalize-vars' has been called before you use this."
(if (not comment-use-syntax)
(if (re-search-forward comment-start-skip limit noerror)
(or (match-end 1) (match-beginning 0))
(goto-char limit)
(unless noerror (error "No comment")))
(let* ((pt (point))
;; Assume (at first) that pt is outside of any string.
(s (parse-partial-sexp pt (or limit (point-max)) nil nil
(if comment-use-global-state (syntax-ppss pt))
t)))
(when (and (nth 8 s) (nth 3 s) (not comment-use-global-state))
;; The search ended at eol inside a string. Try to see if it
;; works better when we assume that pt is inside a string.
(setq s (parse-partial-sexp
pt (or limit (point-max)) nil nil
(list nil nil nil (nth 3 s) nil nil nil nil)
t)))
(if (or (not (and (nth 8 s) (not (nth 3 s))))
;; Make sure the comment starts after PT.
(< (nth 8 s) pt))
(unless noerror (error "No comment"))
;; We found the comment.
(let ((pos (point))
(start (nth 8 s))
(bol (line-beginning-position))
(end nil))
(while (and (null end) (>= (point) bol))
(if (looking-at comment-start-skip)
(setq end (min (or limit (point-max)) (match-end 0)))
(backward-char)))
(goto-char (or end pos))
start)))))
(defun comment-search-backward (&optional limit noerror)
"Find a comment start between LIMIT and point.
Moves point to inside the comment and returns the position of the
comment-starter. If no comment is found, moves point to LIMIT
and raises an error or returns nil if NOERROR is non-nil.
Ensure that `comment-normalize-vars' has been called before you use this."
;; FIXME: If a comment-start appears inside a comment, we may erroneously
;; stop there. This can be rather bad in general, but since
;; comment-search-backward is only used to find the comment-column (in
;; comment-set-column) and to find the comment-start string (via
;; comment-beginning) in indent-new-comment-line, it should be harmless.
(if (not (re-search-backward comment-start-skip limit 'move))
(unless noerror (error "No comment"))
(beginning-of-line)
(let* ((end (match-end 0))
(cs (comment-search-forward end t))
(pt (point)))
(if (not cs)
(progn (beginning-of-line)
(comment-search-backward limit noerror))
(while (progn (goto-char cs)
(comment-forward)
(and (< (point) end)
(setq cs (comment-search-forward end t))))
(setq pt (point)))
(goto-char pt)
cs))))
(defun comment-beginning ()
"Find the beginning of the enclosing comment.
Returns nil if not inside a comment, else moves point and returns
the same as `comment-search-backward'."
(if (and comment-use-syntax comment-use-global-state)
(let ((state (syntax-ppss)))
(when (nth 4 state)
(goto-char (nth 8 state))
(prog1 (point)
(when (save-restriction
;; `comment-start-skip' sometimes checks that the
;; comment char is not escaped. (Bug#16971)
(narrow-to-region (point) (point-max))
(looking-at comment-start-skip))
(goto-char (match-end 0))))))
;; Can't rely on the syntax table, let's guess based on font-lock.
(unless (eq (get-text-property (point) 'face) 'font-lock-string-face)
(let ((pt (point))
(cs (comment-search-backward nil t)))
(when cs
(if (save-excursion
(goto-char cs)
(and
;; For modes where comment-start and comment-end are the same,
;; the search above may have found a `ce' rather than a `cs'.
(or (if comment-end-skip (not (looking-at comment-end-skip)))
;; Maybe font-lock knows that it's a `cs'?
(eq (get-text-property (match-end 0) 'face)
'font-lock-comment-face)
(unless (eq (get-text-property (point) 'face)
'font-lock-comment-face)
;; Let's assume it's a `cs' if we're on the same line.
(>= (line-end-position) pt)))
;; Make sure that PT is not past the end of the comment.
(if (comment-forward 1) (> (point) pt) (eobp))))
cs
(goto-char pt)
nil))))))
(defun comment-forward (&optional n)
"Skip forward over N comments.
Just like `forward-comment' but only for positive N
and can use regexps instead of syntax."
(setq n (or n 1))
(if (< n 0) (error "No comment-backward")
(if comment-use-syntax (forward-comment n)
(while (> n 0)
(setq n
(if (or (forward-comment 1)
(and (looking-at comment-start-skip)
(goto-char (match-end 0))
(re-search-forward comment-end-skip nil 'move)))
(1- n) -1)))
(= n 0))))
(defun comment-enter-backward ()
"Move from the end of a comment to the end of its content.
Point is assumed to be just at the end of a comment."
(if (bolp)
;; comment-end = ""
(progn (backward-char) (skip-syntax-backward " "))
(cond
((save-excursion
(save-restriction
(narrow-to-region (line-beginning-position) (point))
(goto-char (point-min))
(re-search-forward (concat comment-end-skip "\\'") nil t)))
(goto-char (match-beginning 0)))
;; comment-end-skip not found probably because it was not set
;; right. Since \\s> should catch the single-char case, let's
;; check that we're looking at a two-char comment ender.
((not (or (<= (- (point-max) (line-beginning-position)) 1)
(zerop (logand (car (syntax-after (- (point) 1)))
;; Here we take advantage of the fact that
;; the syntax class " " is encoded to 0,
;; so " 4" gives us just the 4 bit.
(car (string-to-syntax " 4"))))
(zerop (logand (car (syntax-after (- (point) 2)))
(car (string-to-syntax " 3"))))))
(backward-char 2)
(skip-chars-backward (string (char-after)))
(skip-syntax-backward " "))
;; No clue what's going on: maybe we're really not right after the
;; end of a comment. Maybe we're at the "end" because of EOB rather
;; than because of a marker.
(t (skip-syntax-backward " ")))))
;;;;
;;;; Commands
;;;;
;;;###autoload
(defun comment-indent-default ()
"Default for `comment-indent-function'."
(if (and (looking-at "\\s<\\s<\\(\\s<\\)?")
(or (match-end 1) (/= (current-column) (current-indentation))))
0
(when (or (/= (current-column) (current-indentation))
(and (> comment-add 0) (looking-at "\\s<\\(\\S<\\|\\'\\)")))
comment-column)))
(defun comment-choose-indent (&optional indent)
"Choose the indentation to use for a right-hand-side comment.
The criteria are (in this order):
- try to keep the comment's text within `comment-fill-column'.
- try to align with surrounding comments.
- prefer INDENT (or `comment-column' if nil).
Point is expected to be at the start of the comment."
(unless indent (setq indent comment-column))
(let ((other nil)
min max)
(pcase indent
(`(,lo . ,hi) (setq min lo) (setq max hi)
(setq indent comment-column))
(_ ;; Avoid moving comments past the fill-column.
(setq max (+ (current-column)
(- (or comment-fill-column fill-column)
(save-excursion (end-of-line) (current-column)))))
(setq min (save-excursion
(skip-chars-backward " \t")
;; Leave at least `comment-inline-offset' space after
;; other nonwhite text on the line.
(if (bolp) 0 (+ comment-inline-offset (current-column)))))))
;; Fix up the range.
(if (< max min) (setq max min))
;; Don't move past the fill column.
(if (<= max indent) (setq indent max))
;; We can choose anywhere between min..max.
;; Let's try to align to a comment on the previous line.
(save-excursion
(when (and (zerop (forward-line -1))
(setq other (comment-search-forward
(line-end-position) t)))
(goto-char other) (setq other (current-column))))
(if (and other (<= other max) (>= other min))
;; There is a comment and it's in the range: bingo!
other
;; Can't align to a previous comment: let's try to align to comments
;; on the following lines, then. These have not been re-indented yet,
;; so we can't directly align ourselves with them. All we do is to try
;; and choose an indentation point with which they will be able to
;; align themselves.
(save-excursion
(while (and (zerop (forward-line 1))
(setq other (comment-search-forward
(line-end-position) t)))
(goto-char other)
(let ((omax (+ (current-column)
(- (or comment-fill-column fill-column)
(save-excursion (end-of-line) (current-column)))))
(omin (save-excursion (skip-chars-backward " \t")
(1+ (current-column)))))
(if (and (>= omax min) (<= omin max))
(progn (setq min (max omin min))
(setq max (min omax max)))
;; Can't align with this anyway, so exit the loop.
(goto-char (point-max))))))
;; Return the closest point to indent within min..max.
(max min (min max indent)))))
;;;###autoload
(defun comment-indent (&optional continue)
"Indent this line's comment to `comment-column', or insert an empty comment.
If CONTINUE is non-nil, use the `comment-continue' markers if any."
(interactive "*")
(comment-normalize-vars)
(let* ((empty (save-excursion (beginning-of-line)
(looking-at "[ \t]*$")))
(starter (or (and continue comment-continue)
(and empty block-comment-start) comment-start))
(ender (or (and continue comment-continue "")
(and empty block-comment-end) comment-end)))
(unless starter (error "No comment syntax defined"))
(beginning-of-line)
(let* ((eolpos (line-end-position))
(begpos (comment-search-forward eolpos t))
cpos indent)
(if (and comment-insert-comment-function (not begpos))
;; If no comment and c-i-c-f is set, let it do everything.
(funcall comment-insert-comment-function)
;; An existing comment?
(if begpos
(progn
(if (and (not (looking-at "[\t\n ]"))
(looking-at comment-end-skip))
;; The comment is empty and we have skipped all its space
;; and landed right before the comment-ender:
;; Go back to the middle of the space.
(forward-char (/ (skip-chars-backward " \t") -2)))
(setq cpos (point-marker)))
;; If none, insert one.
(save-excursion
;; Some `comment-indent-function's insist on not moving
;; comments that are in column 0, so we first go to the
;; likely target column.
(indent-to comment-column)
;; Ensure there's a space before the comment for things
;; like sh where it matters (as well as being neater).
(unless (memq (char-before) '(nil ?\n ?\t ?\s))
(insert ?\s))
(setq begpos (point))
(insert starter)
(setq cpos (point-marker))
(insert ender)))
(goto-char begpos)
;; Compute desired indent.
(setq indent (save-excursion (funcall comment-indent-function)))
;; If `indent' is nil and there's code before the comment, we can't
;; use `indent-according-to-mode', so we default to comment-column.
(unless (or indent (save-excursion (skip-chars-backward " \t") (bolp)))
(setq indent comment-column))
(if (not indent)
;; comment-indent-function refuses: delegate to line-indent.
(indent-according-to-mode)
;; If the comment is at the right of code, adjust the indentation.
(unless (save-excursion (skip-chars-backward " \t") (bolp))
(setq indent (comment-choose-indent indent)))
;; If that's different from comment's current position, change it.
(unless (= (current-column) indent)
(delete-region (point) (progn (skip-chars-backward " \t") (point)))
(indent-to indent)))
(goto-char cpos)
(set-marker cpos nil)))))
;;;###autoload
(defun comment-set-column (arg)
"Set the comment column based on point.
With no ARG, set the comment column to the current column.
With just minus as arg, kill any comment on this line.
With any other arg, set comment column to indentation of the previous comment
and then align or create a comment on this line at that column."
(interactive "P")
(cond
((eq arg '-) (comment-kill nil))
(arg
(comment-normalize-vars)
(save-excursion
(beginning-of-line)
(comment-search-backward)
(beginning-of-line)
(goto-char (comment-search-forward (line-end-position)))
(setq comment-column (current-column))
(message "Comment column set to %d" comment-column))
(comment-indent))
(t (setq comment-column (current-column))
(message "Comment column set to %d" comment-column))))
;;;###autoload
(defun comment-kill (arg)
"Kill the first comment on this line, if any.
With prefix ARG, kill comments on that many lines starting with this one."
(interactive "P")
(comment-normalize-vars)
(dotimes (_i (prefix-numeric-value arg))
(save-excursion
(beginning-of-line)
(let ((cs (comment-search-forward (line-end-position) t)))
(when cs
(goto-char cs)
(skip-syntax-backward " ")
(setq cs (point))
(comment-forward)
(kill-region cs (if (bolp) (1- (point)) (point)))
(indent-according-to-mode))))
(if arg (forward-line 1))))
(defun comment-padright (str &optional n)
"Construct a string composed of STR plus `comment-padding'.
It also adds N copies of the last non-whitespace chars of STR.
If STR already contains padding, the corresponding amount is
ignored from `comment-padding'.
N defaults to 0.
If N is `re', a regexp is returned instead, that would match
the string for any N.
Ensure that `comment-normalize-vars' has been called before you use this."
(setq n (or n 0))
(when (and (stringp str) (string-match "\\S-" str))
;; Separate the actual string from any leading/trailing padding
(string-match "\\`\\s-*\\(.*?\\)\\s-*\\'" str)
(let ((s (match-string 1 str)) ;actual string
(lpad (substring str 0 (match-beginning 1))) ;left padding
(rpad (concat
(substring str (match-end 1)) ;original right padding
(if (numberp comment-padding)
(make-string (min comment-padding
(- (match-end 0) (match-end 1)))
?\s)
(if (not (string-match-p "\\`\\s-" comment-padding))
;; If the padding isn't spaces, then don't
;; shorten the padding.
comment-padding
(substring comment-padding ;additional right padding
(min (- (match-end 0) (match-end 1))
(length comment-padding)))))))
;; We can only duplicate C if the comment-end has multiple chars
;; or if comments can be nested, else the comment-end `}' would
;; be turned into `}}}' where only the first ends the comment
;; and the rest becomes bogus junk.
(multi (not (and comment-quote-nested
;; comment-end is a single char
(string-match "\\`\\s-*\\S-\\s-*\\'" comment-end)))))
(if (not (symbolp n))
(concat lpad s (when multi (make-string n (aref str (1- (match-end 1))))) rpad)
;; construct a regexp that would match anything from just S
;; to any possible output of this function for any N.
(concat (mapconcat (lambda (c) (concat (regexp-quote (string c)) "?"))
lpad "") ;padding is not required
(regexp-quote s)
(when multi "+") ;the last char of S might be repeated
(mapconcat (lambda (c) (concat (regexp-quote (string c)) "?"))
rpad "")))))) ;padding is not required
(defun comment-padleft (str &optional n)
"Construct a string composed of `comment-padding' plus STR.
It also adds N copies of the first non-whitespace chars of STR.
If STR already contains padding, the corresponding amount is
ignored from `comment-padding'.
N defaults to 0.
If N is `re', a regexp is returned instead, that would match the
string for any N.
Ensure that `comment-normalize-vars' has been called before you use this."
(setq n (or n 0))
(when (and (stringp str) (not (string= "" str)))
;; Only separate the left pad because we assume there is no right pad.
(string-match "\\`\\s-*" str)
(let ((s (substring str (match-end 0)))
(pad (concat (if (not (string-match-p "\\`\\s-" comment-padding))
;; If the padding isn't spaces, then don't
;; shorten the padding.
comment-padding
(substring comment-padding
(min (- (match-end 0) (match-beginning 0))
(length comment-padding))))
(match-string 0 str)))
(c (aref str (match-end 0))) ;the first non-space char of STR
;; We can only duplicate C if the comment-end has multiple chars
;; or if comments can be nested, else the comment-end `}' would
;; be turned into `}}}' where only the first ends the comment
;; and the rest becomes bogus junk.
(multi (not (and comment-quote-nested
;; comment-end is a single char
(string-match "\\`\\s-*\\S-\\s-*\\'" comment-end)))))
(if (not (symbolp n))
(concat pad (when multi (make-string n c)) s)
;; Construct a regexp that would match anything from just S
;; to any possible output of this function for any N.
;; We match any number of leading spaces because this regexp will
;; be used for uncommenting where we might want to remove
;; uncomment markers with arbitrary leading space (because
;; they were aligned).
(concat "\\s-*"
(if multi (concat (regexp-quote (string c)) "*"))
(regexp-quote s))))))
;;;###autoload
(defun uncomment-region (beg end &optional arg)
"Uncomment each line in the BEG .. END region.
The numeric prefix ARG can specify a number of chars to remove from the
comment delimiters."
(interactive "*r\nP")
(comment-normalize-vars)
(when (> beg end) (setq beg (prog1 end (setq end beg))))
;; Bind `comment-use-global-state' to nil. While uncommenting a region
;; (which works a line at a time), a comment can appear to be
;; included in a mult-line string, but it is actually not.
(let ((comment-use-global-state nil))
(save-excursion
(funcall uncomment-region-function beg end arg))))
(defun uncomment-region-default-1 (beg end &optional arg)
"Uncomment each line in the BEG .. END region.
The numeric prefix ARG can specify a number of chars to remove from the
comment delimiters.
This function is the default value of `uncomment-region-function'."
(goto-char beg)
(setq end (copy-marker end))
(let* ((numarg (prefix-numeric-value arg))
(ccs comment-continue)
(srei (or (comment-padright ccs 're)
(and (stringp comment-continue) comment-continue)))
(csre (comment-padright comment-start 're))
(sre (and srei (concat "^\\s-*?\\(" srei "\\)")))
spt)
(while (and (< (point) end)
(setq spt (comment-search-forward end t)))
(let ((ipt (point))
;; Find the end of the comment.
(ept (progn
(goto-char spt)
(unless (or (comment-forward)
;; Allow non-terminated comments.
(eobp))
(error "Can't find the comment end"))
(point)))
(box nil)
(box-equal nil)) ;Whether we might be using `=' for boxes.
(save-restriction
(narrow-to-region spt ept)
;; Remove the comment-start.
(goto-char ipt)
(skip-syntax-backward " ")
;; A box-comment starts with a looong comment-start marker.
(when (and (or (and (= (- (point) (point-min)) 1)
(setq box-equal t)
(looking-at "=\\{7\\}")
(not (eq (char-before (point-max)) ?\n))
(skip-chars-forward "="))
(> (- (point) (point-min) (length comment-start)) 7))
(> (count-lines (point-min) (point-max)) 2))
(setq box t))
;; Skip the padding. Padding can come from comment-padding and/or
;; from comment-start, so we first check comment-start.
(if (or (save-excursion (goto-char (point-min)) (looking-at csre))
(looking-at (regexp-quote comment-padding)))
(goto-char (match-end 0)))
(when (and sre (looking-at (concat "\\s-*\n\\s-*" srei)))
(goto-char (match-end 0)))
(if (null arg) (delete-region (point-min) (point))
(let ((opoint (point-marker)))
(skip-syntax-backward " ")
(delete-char (- numarg))
(unless (and (not (bobp))
(save-excursion (goto-char (point-min))
(looking-at comment-start-skip)))
;; If there's something left but it doesn't look like
;; a comment-start any more, just remove it.
(delete-region (point-min) opoint))))
;; Remove the end-comment (and leading padding and such).
(goto-char (point-max)) (comment-enter-backward)
;; Check for special `=' used sometimes in comment-box.
(when (and box-equal (not (eq (char-before (point-max)) ?\n)))
(let ((pos (point)))
;; skip `=' but only if there are at least 7.
(when (> (skip-chars-backward "=") -7) (goto-char pos))))
(unless (looking-at "\\(\n\\|\\s-\\)*\\'")
(when (and (bolp) (not (bobp))) (backward-char))
(if (null arg) (delete-region (point) (point-max))
(skip-syntax-forward " ")
(delete-char numarg)
(unless (or (eobp) (looking-at comment-end-skip))
;; If there's something left but it doesn't look like
;; a comment-end any more, just remove it.