(defcustom fill-individual-varying-indent nil
"*Controls criterion for a new paragraph in `fill-individual-paragraphs'.
Non-nil means changing indent doesn't end a paragraph.
That mode can handle paragraphs with extra indentation on the first line,
but it requires separator lines between paragraphs.
A value of nil means that any change in indentation starts a new paragraph."
:type 'boolean
:group 'fill)
(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'.
If you change this, you should also change `sentence-end'. See Info
node `Sentences'."
:type 'boolean
:group 'fill)
(defcustom colon-double-space nil
"*Non-nil means put two spaces after a colon when filling."
: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."
:type 'boolean
:group 'fill)
(defvar fill-paragraph-function nil
"Mode-specific function to fill a paragraph, or nil if there is none.
If the function returns nil, then `fill-paragraph' does its normal work.")
(defvar enable-kinsoku t
"*Non-nil means enable \"kinsoku\" processing on filling paragraph.
Kinsoku processing is designed to prevent certain characters from being
placed at the beginning or end of a line by filling.
See the documentation of `kinsoku' for more information.")
(defun set-fill-prefix ()
"Set the fill prefix to the current line up to point.
Filling expects lines to start with the fill prefix and
reinserts the fill prefix in each resulting line."
(interactive)
(let ((left-margin-pos (save-excursion (move-to-left-margin) (point))))
(if (> (point) left-margin-pos)
(progn
(setq fill-prefix (buffer-substring left-margin-pos (point)))
(if (equal fill-prefix "")
(setq fill-prefix nil)))
(setq fill-prefix nil)))
(if fill-prefix
(message "fill-prefix: \"%s\"" fill-prefix)
(message "fill-prefix cancelled")))
(defcustom adaptive-fill-mode t
"*Non-nil means determine a paragraph's fill prefix from its text."
:type 'boolean
:group 'fill)
(defcustom adaptive-fill-regexp
(purecopy "[ \t]*\\([-|#;>*]+[ \t]*\\|(?[0-9]+[.)][ \t]*\\)*")
"*Regexp to match text at start of line that constitutes indentation.
If Adaptive Fill mode is enabled, a prefix matching this pattern
on the first and second lines of a paragraph is used as the
standard indentation for the whole paragraph.
If the paragraph has just one line, the indentation is taken from that
line, but in that case `adaptive-fill-first-line-regexp' also plays
a role."
:type 'regexp
:group 'fill)
(defcustom adaptive-fill-first-line-regexp "\\`[ \t]*\\'"
"*Regexp specifying whether to set fill prefix from a one-line paragraph.
When a paragraph has just one line, then after `adaptive-fill-regexp'
finds the prefix at the beginning of the line, if it doesn't
match this regexp, it is replaced with whitespace.
By default, this regexp matches sequences of just spaces and tabs.
However, we never use a prefix from a one-line paragraph
if it would act as a paragraph-starter on the second line."
:type 'regexp
:group 'fill)
(defcustom adaptive-fill-function nil
"*Function to call to choose a fill prefix for a paragraph, or nil.
This function is used when `adaptive-fill-regexp' does not match."
:type '(choice (const nil) function)
:group 'fill)
(defvar fill-indent-according-to-mode nil
"Whether or not filling should try to use the major mode's indentation.")
(defun current-fill-column ()
"Return the fill-column to use for this line.
The fill-column to use for a buffer is stored in the variable `fill-column',
but can be locally modified by the `right-margin' text property, which is
subtracted from `fill-column'.
The fill column to use for a line is the first column at which the column
number equals or exceeds the local fill-column - right-margin difference."
(save-excursion
(if fill-column
(let* ((here (progn (beginning-of-line) (point)))
(here-col 0)
(eol (progn (end-of-line) (point)))
margin fill-col change col)
(while (and (setq margin (get-text-property here 'right-margin)
fill-col (- fill-column (or margin 0))
change (text-property-not-all
here eol 'right-margin margin))
(progn (goto-char (1- change))
(setq col (current-column))
(< col fill-col)))
(setq here change
here-col col))
(max here-col fill-col)))))
(defun canonically-space-region (beg end)
"Remove extra spaces between words in region.
Leave one space between words, two at end of sentences or after colons
\(depending on values of `sentence-end-double-space', `colon-double-space',
and `sentence-end-without-period').
Remove indentation from each line."
(interactive "*r")
(save-excursion
(goto-char beg)
(subst-char-in-region beg end ?\t ?\ )
(while (and (< (point) end)
(re-search-forward " *" end t))
(delete-region
(+ (match-beginning 0)
(save-excursion
(skip-chars-backward " ]})\"'")
(cond ((and sentence-end-double-space
(or (memq (preceding-char) '(?. ?? ?!))
(and sentence-end-without-period
(= (char-syntax (preceding-char)) ?w)))) 2)
((and colon-double-space
(= (preceding-char) ?:)) 2)
((char-equal (preceding-char) ?\n) 0)
(t 1))))
(match-end 0)))
(goto-char beg)
(let ((eol-double-space-re (if colon-double-space
"[.?!:][])}\"']*$"
"[.?!][])}\"']*$")))
(while (and (< (point) end)
(re-search-forward eol-double-space-re end t))
(insert-before-markers-and-inherit ? )))))
(defun fill-common-string-prefix (s1 s2)
"Return the longest common prefix of strings S1 and S2, or nil if none."
(let ((cmp (compare-strings s1 nil nil s2 nil nil)))
(if (eq cmp t)
s1
(setq cmp (1- (abs cmp)))
(unless (zerop cmp)
(substring s1 0 cmp)))))
(defun fill-context-prefix (from to &optional first-line-regexp)
"Compute a fill prefix from the text between FROM and TO.
This uses the variables `adaptive-fill-regexp' and `adaptive-fill-function'
and `adaptive-fill-first-line-regexp'. `paragraph-start' also plays a role;
we reject a prefix based on a one-line paragraph if that prefix would
act as a paragraph-separator."
(or first-line-regexp
(setq first-line-regexp adaptive-fill-first-line-regexp))
(save-excursion
(goto-char from)
(if (eolp) (forward-line 1))
(let ((firstline (point))
first-line-prefix
at-second
second-line-prefix
start)
(move-to-left-margin)
(setq start (point))
(setq first-line-prefix
(cond ((and adaptive-fill-regexp (looking-at adaptive-fill-regexp))
(buffer-substring-no-properties start (match-end 0)))
(adaptive-fill-function (funcall adaptive-fill-function))))
(forward-line 1)
(if (>= (point) to)
(goto-char firstline)
(setq at-second t)
(move-to-left-margin)
(setq start (point))
(setq second-line-prefix
(cond ((looking-at paragraph-start) nil)
((and adaptive-fill-regexp
(looking-at adaptive-fill-regexp))
(buffer-substring-no-properties start (match-end 0)))
(adaptive-fill-function
(funcall adaptive-fill-function)))))
(if at-second
(and second-line-prefix first-line-prefix
(if (or (string-match (concat "\\`"
(regexp-quote second-line-prefix)
"\\(\\'\\|[ \t]\\)")
first-line-prefix)
(string-match "\\`[ \t]+\\'" second-line-prefix))
second-line-prefix
(fill-common-string-prefix first-line-prefix
second-line-prefix)))
(if first-line-prefix
(let ((result
(if (or (and first-line-regexp
(string-match first-line-regexp
first-line-prefix))
(and comment-start-skip
(string-match comment-start-skip
first-line-prefix)))
first-line-prefix
(make-string (string-width first-line-prefix) ?\ ))))
(if (not (eq 0 (string-match paragraph-start
(concat result "a"))))
result)))))))
(defvar fill-nobreak-predicate nil
"If non-nil, a predicate for recognizing places not to break a line.
The predicate is called with no arguments, with point at the place
to be tested. If it returns t, fill commands do not break the line there.")
(let ((alist '((katakana-jisx0201 . kinsoku)
(chinese-gb2312 . kinsoku)
(japanese-jisx0208 . kinsoku)
(japanese-jisx0212 . kinsoku)
(chinese-big5-1 . kinsoku)
(chinese-big5-2 . kinsoku))))
(while alist
(put-charset-property (car (car alist)) 'fill-find-break-point-function
(cdr (car alist)))
(setq alist (cdr alist))))
(defun fill-find-break-point (limit)
"Move point to a proper line breaking position of the current line.
Don't move back past the buffer position LIMIT.
This function is called when we are going to break the current line
after or before a non-ascii character. If the charset of the
character has the property `fill-find-break-point-function', this
function calls the property value as a function with one arg LINEBEG.
If the charset has no such property, do nothing."
(let* ((ch (following-char))
(charset (char-charset ch))
func)
(if (eq charset 'ascii)
(setq ch (preceding-char)
charset (char-charset ch)))
(if (charsetp charset)
(setq func
(get-charset-property charset 'fill-find-break-point-function)))
(if (and func (fboundp func))
(funcall func limit))))
(defun fill-region-as-paragraph (from to &optional justify
nosqueeze squeeze-after)
"Fill the region as one paragraph.
It removes any paragraph breaks in the region and extra newlines at the end,
indents and fills lines between the margins given by the
`current-left-margin' and `current-fill-column' functions.
\(In most cases, the variable `fill-column' controls the width.)
It leaves point at the beginning of the line following the paragraph.
Normally performs justification according to the `current-justification'
function, but with a prefix arg, does full justification instead.
From a program, optional third arg JUSTIFY can specify any type of
justification. Fourth arg NOSQUEEZE non-nil means not to make spaces
between words canonical before filling. Fifth arg SQUEEZE-AFTER, if non-nil,
means don't canonicalize spaces before that position.
Return the fill-prefix used for filling.
If `sentence-end-double-space' is non-nil, then period followed by one
space does not end a sentence, so don't break a line there."
(interactive (progn
(barf-if-buffer-read-only)
(list (region-beginning) (region-end)
(if current-prefix-arg 'full))))
(unless (memq justify '(t nil none full center left right))
(setq justify 'full))
(if (and buffer-undo-list (not (eq buffer-undo-list t)))
(setq buffer-undo-list (cons (point) buffer-undo-list)))
(goto-char (min from to))
(setq to (max from to))
(skip-chars-forward " \t\n")
(let ((from-plus-indent (point))
(oneleft nil))
(beginning-of-line)
(setq from (point))
(goto-char to)
(while (and (> (point) from) (eq ?\n (char-after (1- (point)))))
(if (and oneleft
(not (and use-hard-newlines
(get-text-property (1- (point)) 'hard))))
(delete-backward-char 1)
(backward-char 1)
(setq oneleft t)))
(setq to (point))
(goto-char from-plus-indent))
(if (not (> to (point)))
nil
(or justify (setq justify (current-justification)))
(let ((fill-prefix fill-prefix))
(if (and adaptive-fill-mode
(or (null fill-prefix) (string= fill-prefix "")))
(setq fill-prefix (fill-context-prefix from to)))
(save-restriction
(goto-char from)
(beginning-of-line)
(narrow-to-region (point) to)
(if (not justify) (progn
(goto-char from)
(while (not (eobp))
(if (and (not (eolp))
(< (current-indentation) (current-left-margin)))
(indent-to-left-margin))
(forward-line 1)))
(if use-hard-newlines
(remove-text-properties from (point-max) '(hard nil)))
(if (or (memq justify '(right center))
(< (current-indentation) (current-left-margin)))
(indent-to-left-margin))
(goto-char from)
(let ((fpre (and fill-prefix (not (equal fill-prefix ""))
(concat "[ \t]*"
(regexp-quote fill-prefix)
"[ \t]*"))))
(and fpre
(progn
(if (>= (+ (current-left-margin) (length fill-prefix))
(current-fill-column))
(error "fill-prefix too long for specified width"))
(goto-char from)
(forward-line 1)
(while (not (eobp))
(if (looking-at fpre)
(delete-region (point) (match-end 0)))
(forward-line 1))
(goto-char from)
(if (looking-at fpre)
(goto-char (match-end 0)))
(setq from (point)))))
(beginning-of-line 2)
(indent-region (point) (point-max) 0)
(goto-char from)
(let ((eol-double-space-re (if colon-double-space
"[.?!:][])}\"']*$"
"[.?!][])}\"']*$")))
(while (re-search-forward eol-double-space-re nil t)
(or (eobp) (insert-and-inherit ?\ ))))
(goto-char from)
(if enable-multibyte-characters
(while (search-forward "\n" nil t)
(let ((prev (char-before (match-beginning 0)))
(next (following-char)))
(if (and (or (aref (char-category-set next) ?|)
(aref (char-category-set prev) ?|))
(or (get-charset-property (char-charset prev)
'nospace-between-words)
(get-text-property (1- (match-beginning 0))
'nospace-between-words)))
(delete-char -1)))))
(goto-char from)
(skip-chars-forward " \t")
(subst-char-in-region from (point-max) ?\n ?\ )
(if (and nosqueeze (not (eq justify 'full)))
nil
(canonically-space-region (or squeeze-after (point)) (point-max))
(goto-char (point-max))
(delete-horizontal-space)
(insert-and-inherit " "))
(goto-char (point-min))
(let ((prefixcol 0) linebeg)
(while (not (eobp))
(setq linebeg (point))
(move-to-column (1+ (current-fill-column)))
(if (eobp)
(or nosqueeze (delete-horizontal-space))
(if (re-search-backward " \\|\\c|.\\|.\\c|" linebeg 0)
(forward-char 1))
(while (and (> (point) linebeg)
(or (and sentence-end-double-space
(> (point) (+ linebeg 2))
(eq (preceding-char) ?\ )
(not (eq (following-char) ?\ ))
(eq (char-after (- (point) 2)) ?\.)
(progn (forward-char -2) t))
(and fill-nobreak-predicate
(funcall fill-nobreak-predicate)
(skip-chars-backward " \t"))))
(if (re-search-backward " \\|\\c|.\\|.\\c|" linebeg 0)
(forward-char 1)))
(if (if (zerop prefixcol)
(save-excursion
(skip-chars-backward " \t" linebeg)
(bolp))
(>= prefixcol (current-column)))
(let ((first t))
(move-to-column prefixcol)
(while (and (not (eobp))
(or first
(and (not (bobp))
sentence-end-double-space
(save-excursion
(forward-char -1)
(and (looking-at "\\. ")
(not (looking-at "\\. ")))))
(and fill-nobreak-predicate
(funcall fill-nobreak-predicate))))
(skip-chars-forward " \t")
(if (looking-at "\\c|")
(forward-char 1)
(let ((pos (save-excursion
(skip-chars-forward "^ \n\t")
(point))))
(if (re-search-forward "\\c|" pos t)
(forward-char -1)
(goto-char pos))))
(setq first nil)))
(if (= (preceding-char) ?\ ) (forward-char -1))
(if enable-multibyte-characters
(if (not (and (eq (charset-after (1- (point))) 'ascii)
(eq (charset-after (point)) 'ascii)))
(fill-find-break-point
(save-excursion
(goto-char linebeg)
(move-to-column prefixcol)
(point))))))
(if (and (zerop prefixcol)
(let ((fill-point (point)) nchars)
(save-excursion
(move-to-left-margin)
(setq nchars (- fill-point (point)))
(or (< nchars 0)
(and fill-prefix
(< nchars (length fill-prefix))
(string= (buffer-substring (point)
fill-point)
(substring fill-prefix
0 nchars)))))))
(let ((first t))
(while (and (not (eobp))
(or first
(and (not (bobp))
sentence-end-double-space
(save-excursion
(forward-char -1)
(and (looking-at "\\. ")
(not (looking-at "\\. ")))))
(and fill-nobreak-predicate
(funcall fill-nobreak-predicate))))
(skip-chars-forward " \t")
(if (looking-at "\\c|")
(forward-char 1)
(let ((pos (save-excursion
(skip-chars-forward "^ \n\t")
(point))))
(if (re-search-forward "\\c|" pos t)
(forward-char -1)
(goto-char pos))))
(setq first nil))))
(if (save-excursion (skip-chars-forward " \t") (eobp))
(or nosqueeze (delete-horizontal-space))
(skip-chars-backward " \t")
(if (and (= (following-char) ?\ )
(or (aref (char-category-set (preceding-char)) ?|)
(looking-at "[ \t]+\\c|")))
(forward-char 1))
(insert ?\n)
(set-text-properties (1- (point)) (point)
(text-properties-at (point)))
(if (or fill-prefix
(not fill-indent-according-to-mode)
(memq indent-line-function
'(indent-relative-maybe indent-relative)))
(indent-to-left-margin)
(indent-according-to-mode))
(and fill-prefix (not (equal fill-prefix ""))
(progn
(insert-and-inherit fill-prefix)
(setq prefixcol (current-column))))))
(if justify
(if (save-excursion (skip-chars-forward " \t") (eobp))
(progn
(delete-horizontal-space)
(justify-current-line justify t t))
(forward-line -1)
(justify-current-line justify nil t)
(forward-line 1))))))
(goto-char (point-max)))
(unless (eobp)
(forward-char 1))
fill-prefix)))
(defsubst skip-line-prefix (prefix)
"If point is inside the string PREFIX at the beginning of line, move past it."
(when (and prefix
(< (- (point) (line-beginning-position)) (length prefix))
(save-excursion
(beginning-of-line)
(looking-at (regexp-quote prefix))))
(goto-char (match-end 0))))
(defun fill-paragraph (arg)
"Fill paragraph at or after point. Prefix ARG means justify as well.
If `sentence-end-double-space' is non-nil, then period followed by one
space does not end a sentence, so don't break a line there.
the variable `fill-column' controls the width for filling.
If `fill-paragraph-function' is non-nil, we call it (passing our
argument to it), and if it returns non-nil, we simply return its value.
If `fill-paragraph-function' is nil, return the `fill-prefix' used for filling."
(interactive (progn
(barf-if-buffer-read-only)
(list (if current-prefix-arg 'full))))
(or (and fill-paragraph-function
(let ((function fill-paragraph-function)
fill-paragraph-function)
(funcall function arg)))
(let ((before (point))
fill-pfx
fill-paragraph-function)
(save-excursion
(forward-paragraph)
(or (bolp) (newline 1))
(let ((end (point))
(beg (progn (backward-paragraph) (point))))
(goto-char before)
(setq fill-pfx
(if use-hard-newlines
(fill-region beg end arg)
(fill-region-as-paragraph beg end arg)))))
(skip-line-prefix fill-pfx)
fill-pfx)))
(defun fill-region (from to &optional justify nosqueeze to-eop)
"Fill each of the paragraphs in the region.
A prefix arg means justify as well.
Ordinarily the variable `fill-column' controls the width.
Noninteractively, the third argument JUSTIFY specifies which
kind of justification to do: `full', `left', `right', `center',
or `none' (equivalent to nil). t means handle each paragraph
as specified by its text properties.
The fourth arg NOSQUEEZE non-nil means to leave
whitespace other than line breaks untouched, and fifth arg TO-EOP
non-nil means to keep filling to the end of the paragraph (or next
hard newline, if `use-hard-newlines' is on).
Return the fill-prefix used for filling the last paragraph.
If `sentence-end-double-space' is non-nil, then period followed by one
space does not end a sentence, so don't break a line there."
(interactive (progn
(barf-if-buffer-read-only)
(list (region-beginning) (region-end)
(if current-prefix-arg 'full))))
(unless (memq justify '(t nil none full center left right))
(setq justify 'full))
(let (end beg fill-pfx)
(save-restriction
(goto-char (max from to))
(when to-eop
(skip-chars-backward "\n")
(forward-paragraph))
(setq end (point))
(goto-char (setq beg (min from to)))
(beginning-of-line)
(narrow-to-region (point) end)
(while (not (eobp))
(let ((initial (point))
end)
(if use-hard-newlines
(progn
(while (and (setq end (text-property-any (point) (point-max)
'hard t))
(not (= ?\n (char-after end)))
(not (= end (point-max))))
(goto-char (1+ end)))
(setq end (if end (min (point-max) (1+ end)) (point-max)))
(goto-char initial))
(forward-paragraph 1)
(setq end (point))
(forward-paragraph -1))
(if (< (point) beg)
(goto-char beg))
(if (>= (point) initial)
(setq fill-pfx
(fill-region-as-paragraph (point) end justify nosqueeze))
(goto-char end))))
fill-pfx)))
(defcustom default-justification 'left
"*Method of justifying text not otherwise specified.
Possible values are `left', `right', `full', `center', or `none'.
The requested kind of justification is done whenever lines are filled.
The `justification' text-property can locally override this variable.
This variable automatically becomes buffer-local when set in any fashion."
:type '(choice (const left)
(const right)
(const full)
(const center)
(const none))
:group 'fill)
(make-variable-buffer-local 'default-justification)
(defun current-justification ()
"How should we justify this line?
This returns the value of the text-property `justification',
or the variable `default-justification' if there is no text-property.
However, it returns nil rather than `none' to mean \"don't justify\"."
(let ((j (or (get-text-property
(save-excursion (skip-chars-forward " \t")
(if (and (eobp) (not (bobp)))
(1- (point)) (point)))
'justification)
default-justification)))
(if (eq 'none j)
nil
j)))
(defun set-justification (begin end value &optional whole-par)
"Set the region's justification style.
The kind of justification to use is prompted for.
If the mark is not active, this command operates on the current paragraph.
If the mark is active, the region is used. However, if the beginning and end
of the region are not at paragraph breaks, they are moved to the beginning and
end of the paragraphs they are in.
If `use-hard-newlines' is true, all hard newlines are taken to be paragraph
breaks.
When calling from a program, operates just on region between BEGIN and END,
unless optional fourth arg WHOLE-PAR is non-nil. In that case bounds are
extended to include entire paragraphs as in the interactive command."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))
(let ((s (completing-read
"Set justification to: "
'(("left") ("right") ("full")
("center") ("none"))
nil t)))
(if (equal s "") (error ""))
(intern s))
t))
(save-excursion
(save-restriction
(if whole-par
(let ((paragraph-start (if use-hard-newlines "." paragraph-start))
(paragraph-ignore-fill-prefix (if use-hard-newlines t
paragraph-ignore-fill-prefix)))
(goto-char begin)
(while (and (bolp) (not (eobp))) (forward-char 1))
(backward-paragraph)
(setq begin (point))
(goto-char end)
(skip-chars-backward " \t\n" begin)
(forward-paragraph)
(setq end (point))))
(narrow-to-region (point-min) end)
(unjustify-region begin (point-max))
(put-text-property begin (point-max) 'justification value)
(fill-region begin (point-max) nil t))))
(defun set-justification-none (b e)
"Disable automatic filling for paragraphs in the region.
If the mark is not active, this applies to the current paragraph."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))))
(set-justification b e 'none t))
(defun set-justification-left (b e)
"Make paragraphs in the region left-justified.
This is usually the default, but see the variable `default-justification'.
If the mark is not active, this applies to the current paragraph."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))))
(set-justification b e 'left t))
(defun set-justification-right (b e)
"Make paragraphs in the region right-justified:
Flush at the right margin and ragged on the left.
If the mark is not active, this applies to the current paragraph."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))))
(set-justification b e 'right t))
(defun set-justification-full (b e)
"Make paragraphs in the region fully justified:
This makes lines flush on both margins by inserting spaces between words.
If the mark is not active, this applies to the current paragraph."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))))
(set-justification b e 'full t))
(defun set-justification-center (b e)
"Make paragraphs in the region centered.
If the mark is not active, this applies to the current paragraph."
(interactive (list (if mark-active (region-beginning) (point))
(if mark-active (region-end) (point))))
(set-justification b e 'center t))
(defun justify-current-line (&optional how eop nosqueeze)
"Do some kind of justification on this line.
Normally does full justification: adds spaces to the line to make it end at
the column given by `current-fill-column'.
Optional first argument HOW specifies alternate type of justification:
it can be `left', `right', `full', `center', or `none'.
If HOW is t, will justify however the `current-justification' function says to.
If HOW is nil or missing, full justification is done by default.
Second arg EOP non-nil means that this is the last line of the paragraph, so
it will not be stretched by full justification.
Third arg NOSQUEEZE non-nil means to leave interior whitespace unchanged,
otherwise it is made canonical."
(interactive "*")
(if (eq t how) (setq how (or (current-justification) 'none))
(if (null how) (setq how 'full)
(or (memq how '(none left right center))
(setq how 'full))))
(or (memq how '(none left)) (let ((fc (current-fill-column))
(pos (point-marker))
fp-end beg end indent endcol ncols (nspaces 0) fracspace (curr-fracspace 0) count)
(end-of-line)
(if (and use-hard-newlines (null eop)
(get-text-property (point) 'hard))
(setq eop t))
(skip-chars-backward " \t")
(if (or (bolp)
(and (memq how '(full right))
(= (current-column) fc)))
nil
(setq end (point))
(beginning-of-line)
(skip-chars-forward " \t")
(if (and fill-prefix
(not (string-equal fill-prefix ""))
(equal fill-prefix
(buffer-substring
(point) (min (point-max) (+ (length fill-prefix)
(point))))))
(forward-char (length fill-prefix))
(if (and adaptive-fill-mode
(looking-at adaptive-fill-regexp))
(goto-char (match-end 0))))
(setq fp-end (point))
(skip-chars-forward " \t")
(setq indent (current-column))
(setq beg (point))
(goto-char end)
(setq endcol (current-column))
(cond ((eq 'right how)
(setq ncols (- fc endcol))
(if (< ncols 0)
(delete-region
(progn (goto-char fp-end)
(if (< (current-column) (+ indent ncols))
(move-to-column (+ indent ncols) t))
(point))
(progn (move-to-column indent) (point)))
(goto-char beg)
(indent-to (+ indent ncols))
(if (= beg pos)
(move-marker pos (point)))))
((eq 'center how)
(setq ncols (+ (current-left-margin)
(/ (- fc (current-left-margin) (- endcol indent)) 2)))
(if (< ncols indent)
(delete-region
(progn (goto-char fp-end)
(if (< (current-column) ncols)
(move-to-column ncols t))
(point))
(progn (move-to-column indent) (point)))
(goto-char beg)
(indent-to ncols)
(if (= beg pos)
(move-marker pos (point)))))
((eq 'full how)
(save-restriction
(narrow-to-region beg end)
(or nosqueeze
(canonically-space-region beg end))
(goto-char (point-max))
(while (search-backward " " nil t)
(setq nspaces (1+ nspaces))
(skip-chars-backward " "))
(setq ncols (- fc endcol))
(if (and (> ncols 0) (> nspaces 0) (not eop))
(progn
(setq curr-fracspace (+ ncols (/ (1+ nspaces) 2))
count nspaces)
(while (> count 0)
(skip-chars-forward " ")
(insert-and-inherit
(make-string (/ curr-fracspace nspaces) ?\ ))
(search-forward " " nil t)
(setq count (1- count)
curr-fracspace
(+ (% curr-fracspace nspaces) ncols)))))))
(t (error "Unknown justification value"))))
(goto-char pos)
(move-marker pos nil)))
nil)
(defun unjustify-current-line ()
"Remove justification whitespace from current line.
If the line is centered or right-justified, this function removes any
indentation past the left margin. If the line is full-justified, it removes
extra spaces between words. It does nothing in other justification modes."
(let ((justify (current-justification)))
(cond ((eq 'left justify) nil)
((eq nil justify) nil)
((eq 'full justify) (beginning-of-line-text)
(canonically-space-region (point) (line-end-position)))
((memq justify '(center right))
(save-excursion
(move-to-left-margin nil t)
(if (and fill-prefix
(not (string-equal fill-prefix ""))
(equal fill-prefix
(buffer-substring
(point) (min (point-max) (+ (length fill-prefix)
(point))))))
(forward-char (length fill-prefix)))
(delete-region (point) (progn (skip-chars-forward " \t")
(point))))))))
(defun unjustify-region (&optional begin end)
"Remove justification whitespace from region.
For centered or right-justified regions, this function removes any indentation
past the left margin from each line. For full-justified lines, it removes
extra spaces between words. It does nothing in other justification modes.
Arguments BEGIN and END are optional; default is the whole buffer."
(save-excursion
(save-restriction
(if end (narrow-to-region (point-min) end))
(goto-char (or begin (point-min)))
(while (not (eobp))
(unjustify-current-line)
(forward-line 1)))))
(defun fill-nonuniform-paragraphs (min max &optional justifyp citation-regexp)
"Fill paragraphs within the region, allowing varying indentation within each.
This command divides the region into \"paragraphs\",
only at paragraph-separator lines, then fills each paragraph
using as the fill prefix the smallest indentation of any line
in the paragraph.
When calling from a program, pass range to fill as first two arguments.
Optional third and fourth arguments JUSTIFY and MAIL-FLAG:
JUSTIFY to justify paragraphs (prefix arg),
When filling a mail message, pass a regexp for CITATION-REGEXP
which will match the prefix of a line which is a citation marker
plus whitespace, but no other kind of prefix.
Also, if CITATION-REGEXP is non-nil, don't fill header lines."
(interactive (progn
(barf-if-buffer-read-only)
(list (region-beginning) (region-end)
(if current-prefix-arg 'full))))
(let ((fill-individual-varying-indent t))
(fill-individual-paragraphs min max justifyp citation-regexp)))
(defun fill-individual-paragraphs (min max &optional justify citation-regexp)
"Fill paragraphs of uniform indentation within the region.
This command divides the region into \"paragraphs\",
treating every change in indentation level or prefix as a paragraph boundary,
then fills each paragraph using its indentation level as the fill prefix.
There is one special case where a change in indentation does not start
a new paragraph. This is for text of this form:
foo> This line with extra indentation starts
foo> a paragraph that continues on more lines.
These lines are filled together.
When calling from a program, pass the range to fill
as the first two arguments.
Optional third and fourth arguments JUSTIFY and MAIL-FLAG:
JUSTIFY to justify paragraphs (prefix arg),
When filling a mail message, pass a regexp for CITATION-REGEXP
which will match the prefix of a line which is a citation marker
plus whitespace, but no other kind of prefix.
Also, if CITATION-REGEXP is non-nil, don't fill header lines."
(interactive (progn
(barf-if-buffer-read-only)
(list (region-beginning) (region-end)
(if current-prefix-arg 'full))))
(save-restriction
(save-excursion
(goto-char min)
(beginning-of-line)
(narrow-to-region (point) max)
(if citation-regexp
(while (and (not (eobp))
(or (looking-at "[ \t]*[^ \t\n]+:")
(looking-at "[ \t]*$")))
(if (looking-at "[ \t]*[^ \t\n]+:")
(search-forward "\n\n" nil 'move)
(forward-line 1))))
(narrow-to-region (point) max)
(while (let ((here (point)))
(while (and (not (eobp))
(progn (move-to-left-margin)
(and (not (eobp))
(looking-at paragraph-separate))))
(forward-line 1))
(skip-chars-forward " \t\n") (not (eobp)))
(move-to-left-margin)
(let ((start (point))
fill-prefix fill-prefix-regexp)
(while (progn
(if (not (and fill-prefix
(looking-at fill-prefix-regexp)))
(setq fill-prefix
(fill-individual-paragraphs-prefix
citation-regexp)
fill-prefix-regexp (regexp-quote fill-prefix)))
(forward-line 1)
(if (bolp)
(move-to-left-margin))
(and (not (eobp))
(if fill-individual-varying-indent
(and
(not (looking-at paragraph-separate))
(save-excursion
(not (and (looking-at fill-prefix-regexp)
(progn (forward-char
(length fill-prefix))
(looking-at
paragraph-separate))))))
(and (looking-at fill-prefix-regexp)
(let ((this-line-fill-prefix
(fill-individual-paragraphs-prefix
citation-regexp)))
(>= (length fill-prefix)
(length this-line-fill-prefix)))
(save-excursion
(not (progn (forward-char
(length fill-prefix))
(or (looking-at "[ \t]")
(looking-at paragraph-separate)
(looking-at paragraph-start)))))
(not (and (equal fill-prefix "")
citation-regexp
(looking-at citation-regexp))))))))
(let ((had-newline (bolp)))
(fill-region-as-paragraph start (point) justify)
(if (and (bolp) (not had-newline))
(delete-char -1))))))))
(defun fill-individual-paragraphs-prefix (citation-regexp)
(or (let ((adaptive-fill-first-line-regexp "")
just-one-line-prefix
two-lines-prefix
one-line-citation-part
two-lines-citation-part
adjusted-two-lines-citation-part)
(setq just-one-line-prefix
(fill-context-prefix
(point)
(line-beginning-position 2)))
(setq two-lines-prefix
(fill-context-prefix
(point)
(line-beginning-position 3)))
(when just-one-line-prefix
(setq one-line-citation-part
(if citation-regexp
(fill-individual-paragraphs-citation just-one-line-prefix
citation-regexp)
just-one-line-prefix)))
(when two-lines-prefix
(setq two-lines-citation-part
(if citation-regexp
(fill-individual-paragraphs-citation two-lines-prefix
citation-regexp)
just-one-line-prefix))
(or two-lines-citation-part (setq two-lines-citation-part ""))
(setq adjusted-two-lines-citation-part
(substring two-lines-citation-part 0
(string-match "[ \t]*\\'"
two-lines-citation-part))))
(if (and just-one-line-prefix
two-lines-prefix
(string-match (concat "\\`"
(regexp-quote
adjusted-two-lines-citation-part)
"[ \t]*\\'")
one-line-citation-part)
(>= (string-width one-line-citation-part)
(string-width two-lines-citation-part)))
two-lines-prefix
just-one-line-prefix))
(buffer-substring
(point)
(save-excursion (skip-chars-forward " \t")
(point)))))
(defun fill-individual-paragraphs-citation (string citation-regexp)
(string-match citation-regexp
string)
(match-string 0 string))