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+;; Generate key binding summary for Emacs
+;; Copyright (C) 1985 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 make-command-summary ()
+  "Make a summary of current key bindings in the buffer *Summary*.
+Previous contents of that buffer are killed first."
+  (interactive)
+  (message "Making command summary...")
+  ;; This puts a description of bindings in a buffer called *Help*.
+  (save-window-excursion
+   (describe-bindings))
+  (with-output-to-temp-buffer "*Summary*"
+    (save-excursion
+     (let ((cur-mode mode-name))
+       (set-buffer standard-output)
+       (erase-buffer)
+       (insert-buffer-substring "*Help*")
+       (goto-char (point-min))
+       (delete-region (point) (progn (forward-line 1) (point)))
+       (while (search-forward "         " nil t)
+	 (replace-match "  "))
+       (goto-char (point-min))
+       (while (search-forward "-@ " nil t)
+	 (replace-match "-SP"))
+       (goto-char (point-min))
+       (while (search-forward "  .. ~ " nil t)
+	 (replace-match "SP .. ~"))
+       (goto-char (point-min))
+       (while (search-forward "C-?" nil t)
+	 (replace-match "DEL"))
+       (goto-char (point-min))
+       (while (search-forward "C-i" nil t)
+	 (replace-match "TAB"))
+       (goto-char (point-min))
+       (if (re-search-forward "^Local Bindings:" nil t)
+	   (progn
+	    (forward-char -1)
+	    (insert " for " cur-mode " Mode")
+	    (while (search-forward "??\n" nil t)
+	      (delete-region (point)
+			     (progn
+			      (forward-line -1)
+			      (point))))))
+       (goto-char (point-min))
+       (insert "Emacs command summary, " (substring (current-time-string) 0 10)
+	       ".\n")
+       ;; Delete "key    binding" and underlining of dashes.
+       (delete-region (point) (progn (forward-line 2) (point)))
+       (forward-line 1)			;Skip blank line
+       (while (not (eobp))
+	 (let ((beg (point)))
+	   (or (re-search-forward "^$" nil t)
+	       (goto-char (point-max)))
+	   (double-column beg (point))
+	   (forward-line 1)))
+       (goto-char (point-min)))))
+  (message "Making command summary...done"))
+
+(defun double-column (start end)
+  (interactive "r")
+  (let (half cnt
+        line lines nlines
+	(from-end (- (point-max) end)))
+    (setq nlines (count-lines start end))
+    (if (<= nlines 1)
+	nil
+      (setq half (/ (1+ nlines) 2))
+      (goto-char start)
+      (save-excursion
+       (forward-line half)
+       (while (< half nlines)
+	 (setq half (1+ half))
+	 (setq line (buffer-substring (point) (save-excursion (end-of-line) (point))))
+	 (setq lines (cons line lines))
+	 (delete-region (point) (progn (forward-line 1) (point)))))
+      (setq lines (nreverse lines))
+      (while lines
+	(end-of-line)
+	(indent-to 41)
+	(insert (car lines))
+	(forward-line 1)
+	(setq lines (cdr lines))))
+    (goto-char (- (point-max) from-end))))