Function: c-indent-new-comment-line
c-indent-new-comment-line is an interactive and byte-compiled function
defined in cc-cmds.el.gz.
Signature
(c-indent-new-comment-line &optional SOFT ALLOW-AUTO-FILL)
Documentation
Break line at point and indent, continuing comment or macro if within one.
If inside a comment and comment-multi-line is non-nil, the
indentation and line prefix are preserved (see the
c-comment-prefix-regexp and c-block-comment-prefix variables for
details). If inside a single line comment and comment-multi-line is
nil, a new comment of the same type is started on the next line and
indented as appropriate for comments. If inside a macro, a line
continuation backslash is inserted and aligned as appropriate, and the
new line is indented according to c-syntactic-indentation.
If a fill prefix is specified, it overrides all the above.
Key Bindings
Aliases
c-comment-line-break-function (obsolete since 21.1)
Source Code
;; Defined in /usr/src/emacs/lisp/progmodes/cc-cmds.el.gz
(defun c-indent-new-comment-line (&optional soft allow-auto-fill)
"Break line at point and indent, continuing comment or macro if within one.
If inside a comment and `comment-multi-line' is non-nil, the
indentation and line prefix are preserved (see the
`c-comment-prefix-regexp' and `c-block-comment-prefix' variables for
details). If inside a single line comment and `comment-multi-line' is
nil, a new comment of the same type is started on the next line and
indented as appropriate for comments. If inside a macro, a line
continuation backslash is inserted and aligned as appropriate, and the
new line is indented according to `c-syntactic-indentation'.
If a fill prefix is specified, it overrides all the above."
;; allow-auto-fill is used from c-context-line-break to allow auto
;; filling to break the line more than once. Since this function is
;; used from auto-fill itself, that's normally disabled to avoid
;; unnecessary recursion.
(interactive)
(c-with-string-fences
(let ((fill-prefix fill-prefix)
(do-line-break
(lambda ()
(delete-horizontal-space)
(if soft
(insert-and-inherit ?\n)
(newline (if allow-auto-fill nil 1)))))
;; Already know the literal type and limits when called from
;; c-context-line-break.
(c-lit-limits c-lit-limits)
(c-lit-type c-lit-type)
(c-macro-start c-macro-start))
(c-save-buffer-state ()
(when (not (eq c-auto-fill-prefix t))
;; Called from do-auto-fill.
(unless c-lit-limits
(setq c-lit-limits (c-literal-limits nil nil t)))
(unless c-lit-type
(setq c-lit-type (c-literal-type c-lit-limits)))
(if (memq (cond ((c-query-and-set-macro-start) 'cpp)
((null c-lit-type) 'code)
(t c-lit-type))
c-ignore-auto-fill)
(setq fill-prefix t) ; Used as flag in the cond.
(if (and (null c-auto-fill-prefix)
(eq c-lit-type 'c)
(<= (c-point 'bol) (car c-lit-limits)))
;; The adaptive fill function has generated a prefix, but
;; we're on the first line in a block comment so it'll be
;; wrong. Ignore it to guess a better one below.
(setq fill-prefix nil)
(when (and (eq c-lit-type 'c++)
(not (string-match (concat "\\`[ \t]*"
c-line-comment-starter)
(or fill-prefix ""))))
;; Kludge: If the function that adapted the fill prefix
;; doesn't produce the required comment starter for line
;; comments, then we ignore it.
(setq fill-prefix nil)))
)))
(cond ((eq fill-prefix t)
;; A call from do-auto-fill which should be ignored.
)
(fill-prefix
;; A fill-prefix overrides anything.
(funcall do-line-break)
(insert-and-inherit fill-prefix))
((c-save-buffer-state ()
(unless c-lit-limits
(setq c-lit-limits (c-literal-limits)))
(unless c-lit-type
(setq c-lit-type (c-literal-type c-lit-limits)))
(memq c-lit-type '(c c++)))
;; Some sort of comment.
(if (or comment-multi-line
(save-excursion
(goto-char (car c-lit-limits))
(end-of-line)
(< (point) (cdr c-lit-limits))))
;; Inside a comment that should be continued.
(let ((fill (c-save-buffer-state nil
(c-guess-fill-prefix
(setq c-lit-limits
(c-collect-line-comments c-lit-limits))
c-lit-type)))
(pos (point))
(comment-text-end
(or (and (eq c-lit-type 'c)
(save-excursion
(goto-char (- (cdr c-lit-limits) 2))
(if (looking-at "\\*/") (point))))
(cdr c-lit-limits))))
;; Skip forward past the fill prefix in case
;; we're standing in it.
;;
;; FIXME: This doesn't work well in cases like
;;
;; /* Bla bla bla bla bla
;; bla bla
;;
;; If point is on the 'B' then the line will be
;; broken after "Bla b".
;;
;; If we have an empty comment, /* */, the next
;; lot of code pushes point to the */. We fix
;; this by never allowing point to end up to the
;; right of where it started.
(while (and (< (current-column) (cdr fill))
(not (eolp)))
(forward-char 1))
(if (and (> (point) comment-text-end)
(> (c-point 'bol) (car c-lit-limits)))
(progn
;; The skip takes us out of the (block)
;; comment; insert the fill prefix at bol
;; instead and keep the position.
(setq pos (copy-marker pos t))
(beginning-of-line)
(insert-and-inherit (car fill))
(if soft (insert-and-inherit ?\n) (newline 1))
(goto-char pos)
(set-marker pos nil))
;; Don't break in the middle of a comment starter
;; or ender.
(cond ((> (point) comment-text-end)
(goto-char comment-text-end))
((< (point) (+ (car c-lit-limits) 2))
(goto-char (+ (car c-lit-limits) 2))))
(funcall do-line-break)
(insert-and-inherit (car fill))
(if (and (looking-at c-block-comment-ender-regexp)
(memq (char-before) '(?\ ?\t)))
(backward-char)))) ; can this hit the
; middle of a TAB?
;; Inside a comment that should be broken.
(let ((comment-start comment-start)
(comment-end comment-end)
col)
(if (eq c-lit-type 'c)
(unless (string-match "[ \t]*/\\*" comment-start)
(setq comment-start "/* " comment-end " */"))
(unless (string-match "[ \t]*//" comment-start)
(setq comment-start "// " comment-end "")))
(setq col (save-excursion
(back-to-indentation)
(current-column)))
(funcall do-line-break)
(when (and comment-end (not (equal comment-end "")))
(forward-char -1)
(insert-and-inherit comment-end)
(forward-char 1))
;; c-comment-indent may look at the current
;; indentation, so let's start out with the same
;; indentation as the previous one.
(indent-to col)
(insert-and-inherit comment-start)
(indent-for-comment))))
((c-query-and-set-macro-start)
;; In a macro.
(unless (looking-at "[ \t]*\\\\$")
;; Do not clobber the alignment of the line continuation
;; slash; c-backslash-region might look at it.
(delete-horizontal-space))
;; Got an asymmetry here: In normal code this command
;; doesn't indent the next line syntactically, and otoh a
;; normal syntactically indenting newline doesn't continue
;; the macro.
(c-newline-and-indent (if allow-auto-fill nil 1)))
(t
;; Somewhere else in the code.
(let ((col (save-excursion
(beginning-of-line)
(while (and (looking-at "[ \t]*\\\\?$")
(= (forward-line -1) 0)))
(current-indentation))))
(funcall do-line-break)
(indent-to col)))))))