(defgroup paragraphs nil
"Paragraph and sentence parsing."
:group 'editing)
(put 'use-hard-newlines 'permanent-local t)
(define-minor-mode use-hard-newlines
"Minor mode to distinguish hard and soft newlines.
When active, the functions `newline' and `open-line' add the
text-property `hard' to newlines that they insert, and a line is
only considered as a candidate to match `paragraph-start' or
`paragraph-separate' if it follows a hard newline.
Prefix argument says to turn mode on if positive, off if negative.
When the mode is turned on, if there are newlines in the buffer but no hard
newlines, ask the user whether to mark as hard any newlines preceeding a
`paragraph-start' line. From a program, second arg INSERT specifies whether
to do this; it can be `never' to change nothing, t or `always' to force
marking, `guess' to try to do the right thing with no questions, nil
or anything else to ask the user.
Newlines not marked hard are called \"soft\", and are always internal
to paragraphs. The fill functions insert and delete only soft newlines."
:group 'paragraphs
:extra-args (insert)
(when use-hard-newlines
(if (or (eq insert t) (eq insert 'always)
(and (not (eq 'never insert))
(not (text-property-any (point-min) (point-max) 'hard t))
(save-excursion
(goto-char (point-min))
(search-forward "\n" nil t))
(or (eq insert 'guess)
(y-or-n-p "Make newlines between paragraphs hard? "))))
(save-excursion
(goto-char (point-min))
(while (search-forward "\n" nil t)
(let ((pos (point)))
(move-to-left-margin)
(when (looking-at paragraph-start)
(set-hard-newline-properties (1- pos) pos))
(when (looking-at paragraph-separate)
(set-hard-newline-properties (1- pos) pos)
(end-of-line)
(unless (eobp)
(set-hard-newline-properties (point) (1+ (point)))))))))))
(defcustom paragraph-start "\f\\|[ \t]*$" "\
Regexp for beginning of a line that starts OR separates paragraphs.
This regexp should match lines that separate paragraphs
and should also match lines that start a paragraph
\(and are part of that paragraph).
This is matched against the text at the left margin, which is not necessarily
the beginning of the line, so it should never use \"^\" as an anchor. This
ensures that the paragraph functions will work equally well within a region
of text indented by a margin setting.
The variable `paragraph-separate' specifies how to distinguish
lines that start paragraphs from lines that separate them.
If the variable `use-hard-newlines' is non-nil, then only lines following a
hard newline are considered to match."
:group 'paragraphs
:type 'regexp)
(defcustom paragraph-separate "[ \t\f]*$"
"Regexp for beginning of a line that separates paragraphs.
If you change this, you may have to change `paragraph-start' also.
This is matched against the text at the left margin, which is not necessarily
the beginning of the line, so it should not use \"^\" as an anchor. This
ensures that the paragraph functions will work equally within a region of
text indented by a margin setting."
:group 'paragraphs
:type 'regexp)
(defcustom sentence-end-double-space t
"Non-nil means a single space does not end a sentence.
This is relevant for filling. See also `sentence-end-without-period'
and `colon-double-space'.
This value is used by the function `sentence-end' to construct the
regexp describing the end of a sentence, when the value of the variable
`sentence-end' is nil. See Info node `(elisp)Standard Regexps'."
:type 'boolean
:group 'fill)
(defcustom sentence-end-without-period nil
"Non-nil means a sentence will end without a period.
For example, a sentence in Thai text ends with double space but
without a period.
This value is used by the function `sentence-end' to construct the
regexp describing the end of a sentence, when the value of the variable
`sentence-end' is nil. See Info node `(elisp)Standard Regexps'."
:type 'boolean
:group 'fill)
(defcustom sentence-end-without-space
"$B!#!%!)!*$A!##.#?#!$(0!$!%!)!*$(G!$!%!)!*(B"
"String of characters that end sentence without following spaces.
This value is used by the function `sentence-end' to construct the
regexp describing the end of a sentence, when the value of the variable
`sentence-end' is nil. See Info node `(elisp)Standard Regexps'."
:group 'paragraphs
:type 'string)
(defcustom sentence-end nil
"Regexp describing the end of a sentence.
The value includes the whitespace following the sentence.
All paragraph boundaries also end sentences, regardless.
The value nil means to use the default value defined by the
function `sentence-end'. You should always use this function
to obtain the value of this variable."
:group 'paragraphs
:type '(choice regexp (const :tag "Use default value" nil)))
(defcustom sentence-end-base "[.?!][]\"'$B!I$,1r}(B)}]*"
"Regexp matching the basic end of a sentence, not including following space."
:group 'paragraphs
:type 'string
:version "22.1")
(defun sentence-end ()
"Return the regexp describing the end of a sentence.
This function returns either the value of the variable `sentence-end'
if it is non-nil, or the default value constructed from the
variables `sentence-end-base', `sentence-end-double-space',
`sentence-end-without-period' and `sentence-end-without-space'.
The default value specifies that in order to be recognized as the
end of a sentence, the ending period, question mark, or exclamation point
must be followed by two spaces, with perhaps some closing delimiters
in between. See Info node `(elisp)Standard Regexps'."
(or sentence-end
(concat (if sentence-end-without-period "\\w \\|")
"\\("
sentence-end-base
(if sentence-end-double-space
"\\($\\| $\\|\t\\| \\)" "\\($\\|[\t ]\\)")
"\\|[" sentence-end-without-space "]+"
"\\)"
"[ \t\n]*")))
(defcustom page-delimiter "^\014"
"Regexp describing line-beginnings that separate pages."
:group 'paragraphs
:type 'regexp)
(defcustom paragraph-ignore-fill-prefix nil
"Non-nil means the paragraph commands are not affected by `fill-prefix'.
This is desirable in modes where blank lines are the paragraph delimiters."
:group 'paragraphs
:type 'boolean)
(defun forward-paragraph (&optional arg)
"Move forward to end of paragraph.
With argument ARG, do it ARG times;
a negative argument ARG = -N means move backward N paragraphs.
A line which `paragraph-start' matches either separates paragraphs
\(if `paragraph-separate' matches it also) or is the first line of a paragraph.
A paragraph end is the beginning of a line which is not part of the paragraph
to which the end of the previous line belongs, or the end of the buffer.
Returns the count of paragraphs left to move."
(interactive "p")
(or arg (setq arg 1))
(let* ((opoint (point))
(fill-prefix-regexp
(and fill-prefix (not (equal fill-prefix ""))
(not paragraph-ignore-fill-prefix)
(regexp-quote fill-prefix)))
(parstart (if (and (not (equal "" paragraph-start))
(equal ?^ (aref paragraph-start 0)))
(substring paragraph-start 1)
paragraph-start))
(parsep (if (and (not (equal "" paragraph-separate))
(equal ?^ (aref paragraph-separate 0)))
(substring paragraph-separate 1)
paragraph-separate))
(parsep
(if fill-prefix-regexp
(concat parsep "\\|"
fill-prefix-regexp "[ \t]*$")
parsep))
(sp-parstart (concat "^[ \t]*\\(?:" parstart "\\|" parsep "\\)"))
start found-start)
(while (and (< arg 0) (not (bobp)))
(if (and (not (looking-at parsep))
(re-search-backward "^\n" (max (1- (point)) (point-min)) t)
(looking-at parsep))
(setq arg (1+ arg))
(setq start (point))
(forward-char -1) (beginning-of-line)
(while (and (not (bobp))
(progn (move-to-left-margin)
(looking-at parsep)))
(forward-line -1))
(if (bobp)
nil
(setq arg (1+ arg))
(end-of-line)
(if (if fill-prefix-regexp
(let (multiple-lines)
(while (and (progn (beginning-of-line) (not (bobp)))
(progn (move-to-left-margin)
(not (looking-at parsep)))
(looking-at fill-prefix-regexp))
(unless (= (point) start)
(setq multiple-lines t))
(forward-line -1))
(move-to-left-margin)
(not (bobp)))
(while (and (re-search-backward sp-parstart nil 1)
(setq found-start t)
(progn (setq start (point))
(move-to-left-margin)
(not (looking-at parsep)))
(not (and (looking-at parstart)
(or (not use-hard-newlines)
(bobp)
(get-text-property
(1- start) 'hard)))))
(setq found-start nil)
(goto-char start))
found-start)
(progn
(while (and (not (eobp))
(progn (move-to-left-margin)
(looking-at parsep)))
(forward-line 1))
(end-of-line 0)
(if (> (current-column) (current-left-margin))
(forward-char 1)
(skip-chars-backward " \t")
(if (not (bolp))
(forward-line 1))))
(goto-char (point-min))))))
(while (and (> arg 0) (not (eobp)))
(while (and (not (eobp))
(progn (move-to-left-margin) (not (eobp)))
(looking-at parsep))
(forward-line 1))
(unless (eobp) (setq arg (1- arg)))
(forward-line 1)
(if fill-prefix-regexp
(while (and (not (eobp))
(progn (move-to-left-margin) (not (eobp)))
(not (looking-at parsep))
(looking-at fill-prefix-regexp))
(forward-line 1))
(while (and (re-search-forward sp-parstart nil 1)
(progn (setq start (match-beginning 0))
(goto-char start)
(not (eobp)))
(progn (move-to-left-margin)
(not (looking-at parsep)))
(or (not (looking-at parstart))
(and use-hard-newlines
(not (get-text-property (1- start) 'hard)))))
(forward-char 1))
(if (< (point) (point-max))
(goto-char start))))
(constrain-to-field nil opoint t)
arg))
(defun backward-paragraph (&optional arg)
"Move backward to start of paragraph.
With argument ARG, do it ARG times;
a negative argument ARG = -N means move forward N paragraphs.
A paragraph start is the beginning of a line which is a
`first-line-of-paragraph' or which is ordinary text and follows a
paragraph-separating line; except: if the first real line of a
paragraph is preceded by a blank line, the paragraph starts at that
blank line.
See `forward-paragraph' for more information."
(interactive "p")
(or arg (setq arg 1))
(forward-paragraph (- arg)))
(defun mark-paragraph (&optional arg allow-extend)
"Put point at beginning of this paragraph, mark at end.
The paragraph marked is the one that contains point or follows point.
With argument ARG, puts mark at end of a following paragraph, so that
the number of paragraphs marked equals ARG.
If ARG is negative, point is put at end of this paragraph, mark is put
at beginning of this or a previous paragraph.
Interactively, if this command is repeated
or (in Transient Mark mode) if the mark is active,
it marks the next ARG paragraphs after the ones already marked."
(interactive "p\np")
(unless arg (setq arg 1))
(when (zerop arg)
(error "Cannot mark zero paragraphs"))
(cond ((and allow-extend
(or (and (eq last-command this-command) (mark t))
(and transient-mark-mode mark-active)))
(set-mark
(save-excursion
(goto-char (mark))
(forward-paragraph arg)
(point))))
(t
(forward-paragraph arg)
(push-mark nil t t)
(backward-paragraph arg))))
(defun kill-paragraph (arg)
"Kill forward to end of paragraph.
With arg N, kill forward to Nth end of paragraph;
negative arg -N means kill backward to Nth start of paragraph."
(interactive "p")
(kill-region (point) (progn (forward-paragraph arg) (point))))
(defun backward-kill-paragraph (arg)
"Kill back to start of paragraph.
With arg N, kill back to Nth start of paragraph;
negative arg -N means kill forward to Nth end of paragraph."
(interactive "p")
(kill-region (point) (progn (backward-paragraph arg) (point))))
(defun transpose-paragraphs (arg)
"Interchange this (or next) paragraph with previous one."
(interactive "*p")
(transpose-subr 'forward-paragraph arg))
(defun start-of-paragraph-text ()
(let ((opoint (point)) npoint)
(forward-paragraph -1)
(setq npoint (point))
(skip-chars-forward " \t\n")
(if (and (>= (point) opoint) (< npoint opoint))
(progn
(goto-char npoint)
(if (> npoint (point-min))
(start-of-paragraph-text))))))
(defun end-of-paragraph-text ()
(let ((opoint (point)))
(forward-paragraph 1)
(if (eq (preceding-char) ?\n) (forward-char -1))
(if (<= (point) opoint)
(progn
(forward-char 1)
(if (< (point) (point-max))
(end-of-paragraph-text))))))
(defun forward-sentence (&optional arg)
"Move forward to next `sentence-end'. With argument, repeat.
With negative argument, move backward repeatedly to `sentence-beginning'.
The variable `sentence-end' is a regular expression that matches ends of
sentences. Also, every paragraph boundary terminates sentences as well."
(interactive "p")
(or arg (setq arg 1))
(let ((opoint (point))
(sentence-end (sentence-end)))
(while (< arg 0)
(let ((pos (point))
(par-beg (save-excursion (start-of-paragraph-text) (point))))
(if (and (re-search-backward sentence-end par-beg t)
(or (< (match-end 0) pos)
(re-search-backward sentence-end par-beg t)))
(goto-char (match-end 0))
(goto-char par-beg)))
(setq arg (1+ arg)))
(while (> arg 0)
(let ((par-end (save-excursion (end-of-paragraph-text) (point))))
(if (re-search-forward sentence-end par-end t)
(skip-chars-backward " \t\n")
(goto-char par-end)))
(setq arg (1- arg)))
(constrain-to-field nil opoint t)))
(defun repunctuate-sentences ()
"Put two spaces at the end of sentences from point to the end of buffer.
It works using `query-replace-regexp'."
(interactive)
(query-replace-regexp "\\([]\"')]?\\)\\([.?!]\\)\\([]\"')]?\\) +"
"\\1\\2\\3 "))
(defun backward-sentence (&optional arg)
"Move backward to start of sentence. With arg, do it arg times.
See `forward-sentence' for more information."
(interactive "p")
(or arg (setq arg 1))
(forward-sentence (- arg)))
(defun kill-sentence (&optional arg)
"Kill from point to end of sentence.
With arg, repeat; negative arg -N means kill back to Nth start of sentence."
(interactive "p")
(kill-region (point) (progn (forward-sentence arg) (point))))
(defun backward-kill-sentence (&optional arg)
"Kill back from point to start of sentence.
With arg, repeat, or kill forward to Nth end of sentence if negative arg -N."
(interactive "p")
(kill-region (point) (progn (backward-sentence arg) (point))))
(defun mark-end-of-sentence (arg)
"Put mark at end of sentence. Arg works as in `forward-sentence'.
If this command is repeated, it marks the next ARG sentences after the
ones already marked."
(interactive "p")
(push-mark
(save-excursion
(if (and (eq last-command this-command) (mark t))
(goto-char (mark)))
(forward-sentence arg)
(point))
nil t))
(defun transpose-sentences (arg)
"Interchange this (next) and previous sentence."
(interactive "*p")
(transpose-subr 'forward-sentence arg))