home *** CD-ROM | disk | FTP | other *** search
- ;; Fill commands for Emacs
- ;; Copyright (C) 1985, 1986, 1992 Free Software Foundation, Inc.
-
- ;; 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 1, 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; see the file COPYING. If not, write to
- ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
- (defconst 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.
- Nil means that any change in indentation starts a new paragraph.")
-
- (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)
- (setq fill-prefix (buffer-substring
- (save-excursion (beginning-of-line) (point))
- (point)))
- (if (equal fill-prefix "")
- (setq fill-prefix nil))
- (if fill-prefix
- (message "fill-prefix: \"%s\"" fill-prefix)
- (message "fill-prefix cancelled")))
-
- (defun fill-region-as-paragraph (from to &optional justify-flag)
- "Fill region as one paragraph: break lines to fit fill-column.
- Prefix arg means justify too.
- From program, pass args FROM, TO and JUSTIFY-FLAG."
- (interactive "r\nP")
- (save-restriction
- (narrow-to-region from to)
- (goto-char (point-min))
- (skip-chars-forward "\n")
- (narrow-to-region (point) (point-max))
- (setq from (point))
- (let ((fpre (and fill-prefix (not (equal fill-prefix ""))
- (regexp-quote fill-prefix))))
- ;; Delete the fill prefix from every line except the first.
- ;; The first line may not even have a fill prefix.
- (and fpre
- (progn
- (if (>= (length fill-prefix) fill-column)
- (error "fill-prefix too long for specified width"))
- (goto-char (point-min))
- (forward-line 1)
- (while (not (eobp))
- (if (looking-at fpre)
- (delete-region (point) (match-end 0)))
- (forward-line 1))
- (goto-char (point-min))
- (and (looking-at fpre) (forward-char (length fill-prefix)))
- (setq from (point)))))
- ;; from is now before the text to fill,
- ;; but after any fill prefix on the first line.
-
- ;; Make sure sentences ending at end of line get an extra space.
- (goto-char from)
- (while (re-search-forward "[.?!][])""']*$" nil t)
- (insert ? ))
- ;; The change all newlines to spaces.
- (subst-char-in-region from (point-max) ?\n ?\ )
- ;; Flush excess spaces, except in the paragraph indentation.
- (goto-char from)
- (skip-chars-forward " \t")
- (while (re-search-forward " *" nil t)
- (delete-region
- (+ (match-beginning 0)
- (if (save-excursion
- (skip-chars-backward " ])\"'")
- (memq (preceding-char) '(?. ?? ?!)))
- 2 1))
- (match-end 0)))
- (goto-char (point-max))
- (delete-horizontal-space)
- (insert " ")
- (goto-char (point-min))
- (let ((prefixcol 0) linebeg)
- (while (not (eobp))
- (setq linebeg (point))
- (move-to-column (1+ fill-column))
- (if (eobp)
- nil
- ;; Move back to start of word.
- (skip-chars-backward "^ \n" linebeg)
- (if (if (zerop prefixcol) (bolp) (>= prefixcol (current-column)))
- ;; Keep at least one word even if fill prefix exceeds margin.
- ;; This handles all but the first line of the paragraph.
- (progn
- (skip-chars-forward " ")
- (skip-chars-forward "^ \n"))
- ;; Normally, move back over the single space between the words.
- (forward-char -1)))
- (if (and fill-prefix (zerop prefixcol)
- (< (- (point) (point-min)) (length fill-prefix))
- (string= (buffer-substring (point-min) (point))
- (substring fill-prefix 0 (- (point) (point-min)))))
- ;; Keep at least one word even if fill prefix exceeds margin.
- ;; This handles the first line of the paragraph.
- (progn
- (skip-chars-forward " ")
- (skip-chars-forward "^ \n")))
- ;; Replace all whitespace here with one newline.
- ;; Insert before deleting, so we don't forget which side of
- ;; the whitespace point or markers used to be on.
- (skip-chars-backward " ")
- (insert ?\n)
- (delete-horizontal-space)
- ;; Insert the fill prefix at start of each line.
- ;; Set prefixcol so whitespace in the prefix won't get lost.
- (and (not (eobp)) fill-prefix (not (equal fill-prefix ""))
- (progn
- (insert fill-prefix)
- (setq prefixcol (current-column))))
- ;; Justify the line just ended, if desired.
- (and justify-flag (not (eobp))
- (progn
- (forward-line -1)
- (justify-current-line)
- (forward-line 1)))))))
-
- (defun fill-paragraph (arg)
- "Fill paragraph at or after point.
- Prefix arg means justify as well."
- (interactive "P")
- (save-excursion
- (forward-paragraph)
- (or (bolp) (newline 1))
- (let ((end (point)))
- (backward-paragraph)
- (fill-region-as-paragraph (point) end arg))))
-
- (defun fill-region (from to &optional justify-flag)
- "Fill each of the paragraphs in the region.
- Prefix arg (non-nil third arg, if called from program)
- means justify as well."
- (interactive "r\nP")
- (save-restriction
- (narrow-to-region from to)
- (goto-char (point-min))
- (while (not (eobp))
- (let ((initial (point))
- (end (progn
- (forward-paragraph 1) (point))))
- (forward-paragraph -1)
- (if (>= (point) initial)
- (fill-region-as-paragraph (point) end justify-flag)
- (goto-char end))))))
-
- (defun justify-current-line ()
- "Add spaces to line point is in, so it ends at fill-column."
- (interactive)
- (save-excursion
- (save-restriction
- (let (ncols nwhites beg indent flags)
- (beginning-of-line)
- (forward-char (length fill-prefix))
- (skip-chars-forward " \t")
- (setq indent (current-column))
- (setq beg (point))
- (end-of-line)
- (narrow-to-region beg (point))
- (goto-char beg)
- (while (re-search-forward " *" nil t)
- (delete-region
- (+ (match-beginning 0)
- (if (save-excursion
- (skip-chars-backward " ])\"'")
- (memq (preceding-char) '(?. ?? ?!)))
- 2 1))
- (match-end 0)))
- (goto-char beg)
- (while (re-search-forward "[.?!][])""']*\n" nil t)
- (forward-char -1)
- (insert ? ))
- (goto-char (point-max))
- ;; Note that the buffer bounds start after the indentation,
- ;; so the columns counted by INDENT don't appear in (current-column).
- (setq ncols (- fill-column (current-column) indent))
- ;; Count word-boundaries in the line.
- (setq nwhites 0)
- (while (search-backward " " nil t)
- (skip-chars-backward " ")
- (setq nwhites (1+ nwhites)))
- (if (> nwhites 0)
- (progn
- ;; Add space uniformly as far as we can.
- (goto-char (point-max))
- (while (search-backward " " nil t)
- (insert-char ?\ (/ ncols nwhites))
- (skip-chars-backward " "))
- ;; Make a bit vector for where to add the rest.
- (setq ncols (% ncols nwhites))
- (setq flags (make-string nwhites 0))
- ;; Randomly set NCOLS different bits.
- (while (> ncols 0)
- (let ((where (% (logand 262143 (random)) nwhites)))
- (or (> (aref flags where) 0)
- (progn
- (aset flags where 1)
- (setq ncols (1- ncols))))))
- ;; Insert a space at the boundaries flagged in the vector.
- (goto-char (point-max))
- (let ((where 0))
- (while (search-backward " " nil t)
- (if (> (aref flags where) 0)
- (insert " "))
- (setq where (1+ where))
- (skip-chars-backward " ")))))))))
-
- (defun fill-individual-paragraphs (min max &optional justifyp mailp)
- "Fill each paragraph in region according to its individual fill prefix.
-
- If `fill-individual-varying-indent' is non-nil,
- then a mere change in indentation does not end a paragraph. In this mode,
- the indentation for a paragraph is the minimum indentation of any line in it.
-
- Calling from a program, pass range to fill as first two arguments.
-
- Optional third and fourth arguments JUSTIFY-FLAG and MAIL-FLAG:
- JUSTIFY-FLAG to justify paragraphs (prefix arg),
- MAIL-FLAG for a mail message, i. e. don't fill header lines."
- (interactive "r\nP")
- (save-restriction
- (save-excursion
- (goto-char min)
- (beginning-of-line)
- (if mailp
- (while (looking-at "[^ \t\n]*:")
- (forward-line 1)))
- (narrow-to-region (point) max)
- ;; Loop over paragraphs.
- (while (progn (skip-chars-forward " \t\n") (not (eobp)))
- (beginning-of-line)
- (let ((start (point))
- fill-prefix fill-prefix-regexp)
- ;; Find end of paragraph, and compute the smallest fill-prefix
- ;; that fits all the lines in this paragraph.
- (while (progn
- ;; Update the fill-prefix on the first line
- ;; and whenever the prefix good so far is too long.
- (if (not (and fill-prefix
- (looking-at fill-prefix-regexp)))
- (setq fill-prefix
- (buffer-substring (point)
- (save-excursion (skip-chars-forward " \t") (point)))
- fill-prefix-regexp
- (regexp-quote fill-prefix)))
- (forward-line 1)
- ;; Now stop the loop if end of paragraph.
- (and (not (eobp))
- (if fill-individual-varying-indent
- ;; If this line is a separator line, with or
- ;; without prefix, end the paragraph.
- (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))))))
- ;; If this line has more or less indent
- ;; than the fill prefix wants, end the paragraph.
- (and (looking-at fill-prefix-regexp)
- (save-excursion
- (not (progn (forward-char (length fill-prefix))
- (or (looking-at paragraph-separate)
- (looking-at paragraph-start))))))))))
- ;; Fill this paragraph, but don't add a newline at the end.
- (let ((had-newline (bolp)))
- (fill-region-as-paragraph start (point) justifyp)
- (or had-newline (delete-char -1))))))))
-
-