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+;; Fill commands for Emacs
+;; Copyright (C) 1985, 1986 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.
+
+
+(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))
+    (goto-char (point-max))
+    (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.
+    ;; loses on split abbrevs ("Mr.\nSmith")
+    (goto-char from)
+    (while (re-search-forward "[.?!][])\"']*$" nil t)
+      (insert ? ))
+
+    ;; Then 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")
+    ;; nuke tabs while we're at it; they get screwed up in a fill
+    ;; this is quick, but loses when a sole tab follows the end of a sentence.
+    ;; actually, it is difficult to tell that from "Mr.\tSmith".
+    ;; blame the typist.
+    (subst-char-in-region (point) (point-max) ?\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))
+      (while (not (eobp))
+	(move-to-column (1+ fill-column))
+	(if (eobp)
+	    nil
+	  (skip-chars-backward "^ \n")
+	  (if (if (zerop prefixcol) (bolp) (>= prefixcol (current-column)))
+	      (skip-chars-forward "^ \n")
+	    (forward-char -1)))
+	;; Inserting the newline first prevents losing track of point.
+	(skip-chars-backward " ")
+	(insert ?\n)
+	(delete-horizontal-space)
+	(and (not (eobp)) fill-prefix (not (equal fill-prefix ""))
+	     (progn
+	       (insert fill-prefix)
+	       (setq prefixcol (current-column))))
+	(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 beg)
+      (beginning-of-line)
+      (forward-char (length fill-prefix))
+      (skip-chars-forward " \t")
+      (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))
+      (setq ncols (- fill-column (current-column)))
+      (if (search-backward " " nil t)
+	  (while (> ncols 0)
+	    (let ((nmove (+ 3 (random 3))))
+	      (while (> nmove 0)
+		(or (search-backward " " nil t)
+		    (progn
+		     (goto-char (point-max))
+		     (search-backward " ")))
+		(skip-chars-backward " ")
+		(setq nmove (1- nmove))))
+	    (insert " ")
+	    (skip-chars-backward " ")
+	    (setq ncols (1- ncols))))))))
+
+(defun fill-individual-paragraphs (min max &optional justifyp mailp)
+  "Fill each paragraph in region according to its individual fill prefix.
+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")
+  (let (fill-prefix)
+    (save-restriction
+      (save-excursion
+	(narrow-to-region min max)
+	(goto-char (point-min))
+	(while (progn
+		 (skip-chars-forward " \t\n")
+		 (not (eobp)))
+	  (setq fill-prefix (buffer-substring (point) (progn (beginning-of-line) (point))))
+	  (let ((fin (save-excursion (forward-paragraph) (point)))
+		(start (point)))
+	    (if mailp
+		(while (re-search-forward "^[ \t]*[^ \t\n]*:" fin t)
+		  (forward-line 1)))
+	    (cond ((= start (point))
+		   (fill-region-as-paragraph (point) fin justifyp)
+		   (goto-char fin)))))))))
+