Index: NEWS
===================================================================
RCS file: /cvsroot/emacs/emacs/etc/NEWS,v
retrieving revision 1.661
diff -u -u -r1.661 NEWS
--- NEWS	28 Apr 2002 21:16:32 -0000	1.661
+++ NEWS	29 Apr 2002 04:30:49 -0000
@@ -49,6 +48,13 @@
 
 
 * Changes in Emacs 21.4
+
++++
+** The key `M-y' has been extended to display a menu of kill ring
+entries, if the previous command was not a 'C-y'.  Previously, `M-y'
+ran the command `yank-pop'.  Now it runs `yank-previous', which will
+either display a menu (`kill-ring-menu') or call `yank-pop'.  See the
+node "Yanking Earlier Kills" in the Emacs manual for more information.
 
 ---
 ** The new options `buffers-menu-show-directories' and
--- killing.texi.~1.26.~	Wed Sep 12 17:01:34 2001
+++ killing.texi	Sun Apr 28 16:25:50 2002
@@ -270,8 +270,7 @@
 @item C-y
 Yank last killed text (@code{yank}).
 @item M-y
-Replace text just yanked with an earlier batch of killed text
-(@code{yank-pop}).
+Choose previously yanked text to insert (@code{yank-previous}).
 @item M-w
 Save region as last killed text without actually killing it
 (@code{kill-ring-save}).
@@ -374,49 +373,94 @@
 
 @cindex yanking previous kills
 @kindex M-y
+@findex yank-previous
 @findex yank-pop
-  To recover killed text that is no longer the most recent kill, use the
-@kbd{M-y} command (@code{yank-pop}).  It takes the text previously
-yanked and replaces it with the text from an earlier kill.  So, to
-recover the text of the next-to-the-last kill, first use @kbd{C-y} to
-yank the last kill, and then use @kbd{M-y} to replace it with the
-previous kill.  @kbd{M-y} is allowed only after a @kbd{C-y} or another
-@kbd{M-y}.
-
-  You can understand @kbd{M-y} in terms of a ``last yank'' pointer which
-points at an entry in the kill ring.  Each time you kill, the ``last
-yank'' pointer moves to the newly made entry at the front of the ring.
-@kbd{C-y} yanks the entry which the ``last yank'' pointer points to.
-@kbd{M-y} moves the ``last yank'' pointer to a different entry, and the
-text in the buffer changes to match.  Enough @kbd{M-y} commands can move
-the pointer to any entry in the ring, so you can get any entry into the
+@findex kill-ring-menu
+  To recover killed text that is no longer the most recent kill, use
+the @kbd{M-y} command (@code{yank-previous}).  This command can act in
+two different ways.  If the previous command was not a yank, then
+@kbd{M-y} will display a menu of kill ring entries, which you can
+choose from (@code{kill-ring-menu}).  If the previous command was a
+yank, then @kbd{M-y} will replace the previously yanked text with the
+text from an earlier kill (@code{yank-pop}).
+
+@subsubsection The Kill Ring Menu 
+If you are not sure how long ago you killed the piece of text you're
+loooking for, it can often be easiest to use the kill ring menu.
+Simply type @kbd{M-y} (which was not preceeded by a @kbd{C-y}), and a
+window should pop up, which will display the text previously killed,
+one entry on each line.  In this special mode, keys do not insert
+themselves; instead, they choose actions to perform.
+
+@table @kbd
+@item RET
+Choose the text at point to yank (@code{kill-ring-menu-insert}).
+@item n
+Move point forward by one kill ring entry
+(@code{kill-ring-menu-forward}).
+@item p
+Move point backwards by one kill ring entry
+(@code{kill-ring-menu-backward}).
+@item q
+Quit the kill ring menu without yanking any text
+(@code{kill-ring-menu-quit}).
+@item d
+Remove the text at point from the kill ring
+(@code{kill-ring-menu-delete}).
+@end table
+
+The kill ring menu can display multi-line text; In the default display
+style, all text is shown on one line, and newlines are shown as a
+@samp{\n}.
+
+@subsubsection Cycling Through Yanked Text
+
+If you know precisely where the text you previously yanked is in the
+@code{kill-ring}, or it was very recently yanked, you may find using
+the @code{yank-pop} functionality of @kbd{M-y} to be faster than the
+kill ring menu.  For example, to recover the text of the
+next-to-the-last kill, you could first use @kbd{C-y} to yank the last
+kill, and then type @kbd{M-y} to replace it with the previous kill.
+
+  You can understand @code{yank-pop} in terms of a ``last yank''
+pointer which points at an entry in the kill ring.  Each time you
+kill, the ``last yank'' pointer moves to the newly made entry at the
+front of the ring.  @kbd{C-y} yanks the entry which the ``last yank''
+pointer points to.  After that, typing @kbd{M-y} moves the ``last
+yank'' pointer to a different entry, and the text in the buffer
+changes to match.  Enough @code{yank-pop} commands can move the
+pointer to any entry in the ring, so you can get any entry into the
 buffer.  Eventually the pointer reaches the end of the ring; the next
 @kbd{M-y} loops back around to the first entry again.
 
-  @kbd{M-y} moves the ``last yank'' pointer around the ring, but it does
-not change the order of the entries in the ring, which always runs from
-the most recent kill at the front to the oldest one still remembered.
-
-  @kbd{M-y} can take a numeric argument, which tells it how many entries
-to advance the ``last yank'' pointer by.  A negative argument moves the
-pointer toward the front of the ring; from the front of the ring, it
-moves ``around'' to the last entry and continues forward from there.
-
-  Once the text you are looking for is brought into the buffer, you can
-stop doing @kbd{M-y} commands and it will stay there.  It's just a copy
-of the kill ring entry, so editing it in the buffer does not change
-what's in the ring.  As long as no new killing is done, the ``last
-yank'' pointer remains at the same place in the kill ring, so repeating
-@kbd{C-y} will yank another copy of the same previous kill.
-
-  If you know how many @kbd{M-y} commands it would take to find the
-text you want, you can yank that text in one step using @kbd{C-y} with
-a numeric argument.  @kbd{C-y} with an argument restores the text from
-the specified kill ring entry, counting back from the most recent as
-1.  Thus, @kbd{C-u 2 C-y} gets the next-to-the-last block of killed
+  @code{yank-pop} moves the ``last yank'' pointer around the ring, but
+it does not change the order of the entries in the ring, which always
+runs from the most recent kill at the front to the oldest one still
+remembered.
+
+  @code{yank-pop} can take a numeric argument, which tells it how many
+entries to advance the ``last yank'' pointer by.  A negative argument
+moves the pointer toward the front of the ring; from the front of the
+ring, it moves ``around'' to the last entry and continues forward from
+there.
+
+  Once the text you are looking for is brought into the buffer, you
+can stop doing @code{yank-pop} commands and it will stay there.  It's
+just a copy of the kill ring entry, so editing it in the buffer does
+not change what's in the ring.  As long as no new killing is done, the
+``last yank'' pointer remains at the same place in the kill ring, so
+repeating @kbd{C-y} will yank another copy of the same previous kill.
+
+  If you know how many @code{yank-pop} commands it would take to find
+the text you want, you can yank that text in one step using @kbd{C-y}
+with a numeric argument.  @kbd{C-y} with an argument restores the text
+from the specified kill ring entry, counting back from the most recent
+as 1.  Thus, @kbd{C-u 2 C-y} gets the next-to-the-last block of killed
 text---it is equivalent to @kbd{C-y M-y}.  @kbd{C-y} with a numeric
 argument starts counting from the ``last yank'' pointer, and sets the
 ``last yank'' pointer to the entry that it yanks.
+
+@subsubsection The Kill Ring Data
 
 @vindex kill-ring-max
   The length of the kill ring is controlled by the variable
Index: simple.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/simple.el,v
retrieving revision 1.539
diff -u -u -r1.539 simple.el
--- simple.el	27 Apr 2002 23:16:18 -0000	1.539
+++ simple.el	29 Apr 2002 04:29:23 -0000
@@ -1713,9 +1713,69 @@
   :type 'integer
   :group 'killing)
 
+(defcustom browse-kill-ring-display-style 'one-line
+  "How to display the kill ring menu items.
+
+If `one-line', then replace newlines with \"\\n\" for display.
+
+If `separated', then display `browse-kill-ring-separator' between
+entries."
+  :type '(choice (const :tag "One line" one-line)
+		 (const :tag "Separated" separated))
+  :group 'killing)
+
+(defcustom browse-kill-ring-quit-action 'bury-and-delete-window
+  "What action to take when `browse-kill-ring-quit' is called.
+
+If `bury-buffer', then simply bury the *Kill Ring* buffer, but keep
+the window.
+
+If `bury-and-delete-window', then bury the buffer, and (if there is
+more than one window) delete the window.  This is the default.
+
+If `kill-and-delete-window', then kill the *Kill Ring* buffer, and
+delete the window on close.
+
+Otherwise, it should be a function to call."
+  :type '(choice (const :tag "Bury buffer" :value bury-buffer)
+		 (const :tag "Delete window" :value delete-window)
+		 (const :tag "Bury buffer and delete window" :value bury-and-delete-window)
+		 (const :tag "Kill buffer and delete window" :value kill-and-delete-window))
+  :group 'killing)
+
+(defcustom browse-kill-ring-maximum-display-length nil
+  "Whether or not to limit the length of displayed items.
+
+If this variable is an integer, the display of `kill-ring' will be
+limited to that many characters.
+Setting this variable to nil means no limit."
+  :type '(choice (const :tag "None" nil)
+		 integer)
+  :group 'browse-kill-ring)
+
+(defcustom browse-kill-ring-separator "-------"
+  "The string separating entries in the `separated' style.
+See `browse-kill-ring-display-style'."
+  :type 'string
+  :group 'killing)
+
+(defcustom browse-kill-ring-highlight-current-entry nil
+  "If non-nil, highlight the currently selected `kill-ring' entry."
+  :type 'boolean
+  :group 'killing)
+
+(defface browse-kill-ring-separator-face '((t :inherit bold))
+  "The face in which to highlight the `browse-kill-ring-separator'."
+  :group 'killing)
+
 (defvar kill-ring-yank-pointer nil
   "The tail of the kill ring whose car is the last thing yanked.")
 
+(defvar browse-kill-ring-original-window nil
+  "The window in which chosen kill ring data will be inserted.
+It is probably not a good idea to set this variable directly; simply
+call `browse-kill-ring' again.")
+
 (defun kill-new (string &optional replace)
   "Make STRING the latest kill in the kill ring.
 Set `kill-ring-yank-pointer' to point to it.
@@ -1770,8 +1830,6 @@
 	    (setq kill-ring-yank-pointer ARGth-kill-element))
 	(car ARGth-kill-element)))))
 
-
-
 ;;;; Commands for manipulating the kill ring.
 
 (defcustom kill-read-only-ok nil
@@ -1921,8 +1979,8 @@
 The sequence of kills wraps around, so that after the oldest one
 comes the newest one."
   (interactive "*p")
-  (if (not (eq last-command 'yank))
-      (error "Previous command was not a yank"))
+  (unless (eq last-command 'yank)
+    (error "Previous command was not a yank"))
   (setq this-command 'yank)
   (let ((inhibit-read-only t)
 	(before (< (point) (mark t))))
@@ -1937,6 +1995,18 @@
 		     (set-marker (mark-marker) (point) (current-buffer))))))
   nil)
 
+(defun yank-previous (arg)
+  "Replace previously yanked text, or display a kill ring menu.
+If the last command was a `yank', `yank-previous', or `yank-pop', then
+this command will replace a just-yanked section of text with a prevous
+entry in the kill ring, using ARG.  See `yank-pop'.
+Otherwise, this command will display a menu of kill ring entries; see
+`browse-kill-ring'."
+  (interactive "*p")
+  (if (not (memq last-command '(yank yank-previous)))
+      (browse-kill-ring)
+    (yank-pop arg)))
+
 (defun yank (&optional arg)
   "Reinsert the last stretch of killed text.
 More precisely, reinsert the stretch of killed text most recently
@@ -1983,6 +2053,251 @@
   (if (listp arg) (setq arg (car arg)))
   (if (eq arg '-) (setq arg -1))
   (kill-region (point) (forward-point (- arg))))
+
+(put 'browse-kill-ring-mode 'mode-class 'special)
+(define-derived-mode browse-kill-ring-mode fundamental-mode
+  "Kill Ring"
+  "A major mode for browsing the `kill-ring'.
+You most likely do not want to call `browse-kill-ring-mode' directly; use
+`browse-kill-ring' instead.
+
+\\{browse-kill-ring-mode-map}"
+  (set (make-local-variable 'browse-kill-ring-original-window) nil)
+  (set (make-local-variable 'font-lock-defaults)
+       '(nil t nil nil nil
+	     (font-lock-fontify-region-function . browse-kill-ring-fontify-region-function)
+	     (font-lock-unfontify-region-function . browse-kill-ring-unfontify-region-function)))
+  (define-key browse-kill-ring-mode-map (kbd "q") 'browse-kill-ring-quit)
+  (define-key browse-kill-ring-mode-map (kbd "C-g") 'browse-kill-ring-quit)
+  (define-key browse-kill-ring-mode-map (kbd "d") 'browse-kill-ring-delete)
+  (define-key browse-kill-ring-mode-map (kbd "g") 'browse-kill-ring-update)
+  (define-key browse-kill-ring-mode-map (kbd "n") 'browse-kill-ring-forward)
+  (define-key browse-kill-ring-mode-map (kbd "p") 'browse-kill-ring-backward)
+  (define-key browse-kill-ring-mode-map [(mouse-2)] 'browse-kill-ring-mouse-insert)
+  (define-key browse-kill-ring-mode-map (kbd "?") 'describe-mode)
+  (define-key browse-kill-ring-mode-map (kbd "h") 'describe-mode)
+  (define-key browse-kill-ring-mode-map (kbd "RET") 'browse-kill-ring-insert))
+
+(defun browse-kill-ring-fontify-region-function (beg end &optional verbose)
+  (when verbose (message "Fontifying..."))
+  (let ((inhibit-read-only t))
+    (font-lock-fontify-on-text-properties
+     beg end 'browse-kill-ring-special 'bold)
+    (when verbose (message "Fontifying...done"))))
+
+(defun browse-kill-ring-unfontify-region-function (beg end)
+  (let ((inhibit-read-only t))
+    (remove-text-properties beg end '(face nil))))
+
+(defun browse-kill-ring-elide (str)
+  (if (and browse-kill-ring-maximum-display-length
+	   (> (length str)
+	      browse-kill-ring-maximum-display-length))
+      (concat (substring str 0 (- browse-kill-ring-maximum-display-length 3))
+	      (propertize "..." 'browse-kill-ring-special t)))
+  str)
+
+(defmacro browse-kill-ring-add-overlays-for (item &rest body)
+  (let ((beg (gensym "browse-kill-ring-add-overlays-"))
+	(end (gensym "browse-kill-ring-add-overlays-")))
+    `(let ((,beg (point))
+	   (,end
+	    (progn
+	      ,@body
+	      (point))))
+       (let ((o (make-overlay ,beg ,end)))
+	 (overlay-put o 'browse-kill-ring-target ,item)
+	 (overlay-put o 'mouse-face 'highlight)))))
+;; (put 'browse-kill-ring-add-overlays-for 'lisp-indent-function 1)
+
+(defun browse-kill-ring-insert-as-one-line (items)
+  (dolist (item items)
+    (browse-kill-ring-add-overlays-for item
+      (let* ((item (browse-kill-ring-elide item))
+	     (len (length item))
+	     (start 0)
+	     (newl (propertize "\\n" 'browse-kill-ring-special t)))
+	(while (and (< start len)
+		    (string-match "\n" item start))
+	  (insert (substring item start (match-beginning 0))
+		  newl)
+	  (setq start (match-end 0)))
+	(insert (substring item start len))))
+    (insert "\n")))
+
+(defun browse-kill-ring-insert-as-separated (items)
+  (while (cdr items)
+    (browse-kill-ring-insert-as-separated-1 (car items) t)
+    (setq items (cdr items)))
+  (when items
+    (browse-kill-ring-insert-as-separated-1 (car items) nil)))
+
+(defun browse-kill-ring-insert-as-separated-1 (origitem separatep)
+  (let* ((item (browse-kill-ring-elide origitem))
+	 (len (length item)))
+    (browse-kill-ring-add-overlays-for origitem
+	(insert item))
+    (insert "\n")
+    (when separatep
+      (insert (propertize browse-kill-ring-separator
+			  'browse-kill-ring-special t))
+      (insert "\n"))))
+
+;; (unintern 'browse-kill-ring-add-overlays-for)
+
+(defun browse-kill-ring-quit ()
+  "Take the action specified by `browse-kill-ring-quit-action'."
+  (interactive)
+  (case browse-kill-ring-quit-action
+    (kill-and-delete-window
+     (kill-buffer (current-buffer))
+     (unless (= (count-windows) 1)
+       (delete-window)))
+    (bury-and-delete-window
+     (bury-buffer)
+     (unless (= (count-windows) 1)
+       (delete-window)))
+    (t
+     (funcall browse-kill-ring-quit-action))))
+
+(defun browse-kill-ring-forward (&optional arg)
+  "Move forward by ARG `kill-ring' entries."
+  (interactive "p")
+  (beginning-of-line)
+  (while (not (zerop arg))
+    (if (< arg 0)
+	(progn
+	  (incf arg)
+	  (if (overlays-at (point))
+	      (progn
+		(goto-char (overlay-start (car (overlays-at (point)))))
+		(goto-char (previous-overlay-change (point)))
+		(goto-char (previous-overlay-change (point))))
+	    (progn
+	      (goto-char (1- (previous-overlay-change (point))))
+	      (unless (bobp)
+		(goto-char (overlay-start (car (overlays-at (point)))))))))
+      (progn
+	(decf arg)
+	(if (overlays-at (point))
+	    (progn
+	      (goto-char (overlay-end (car (overlays-at (point)))))
+	      (goto-char (next-overlay-change (point))))
+	  (goto-char (next-overlay-change (point)))
+	  (unless (eobp)
+	    (goto-char (overlay-start (car (overlays-at (point))))))))))
+  ;; This could probably be implemented in a more intelligent manner.
+  ;; Perhaps keep track over the overlay we started from?  That would
+  ;; break when the user moved manually, though.
+  (when (and browse-kill-ring-highlight-current-entry
+	     (overlays-at (point)))
+    (let ((overs (overlay-lists))
+	  (current-overlay (car (overlays-at (point)))))
+      (mapcar #'(lambda (o)
+		  (overlay-put o 'face nil))
+	      (nconc (car overs) (cdr overs)))
+      (overlay-put current-overlay 'face 'highlight))))
+
+(defun browse-kill-ring-backward (&optional arg)
+  "Move backward by ARG `kill-ring' entries."
+  (interactive "p")
+  (browse-kill-ring-forward (- arg)))
+
+(defun browse-kill-ring-do-insert (buf pt)
+  (let ((str (with-current-buffer buf
+	       (let ((overs (overlays-at pt)))
+		 (or (and overs
+			  (overlay-get (car overs) 'browse-kill-ring-target))
+		     (error "No kill ring item here"))))))
+    (let ((orig (current-buffer)))
+      (unwind-protect
+	  (progn
+	    (unless (window-live-p browse-kill-ring-original-window)
+	      (browse-kill-ring-quit)
+	      (error (substitute-command-keys "Window %s has been deleted; Try calling '\\[yank-previous]' again")
+		     browse-kill-ring-original-window))
+	    (set-buffer (window-buffer browse-kill-ring-original-window))
+	    (save-excursion
+	      (insert str)))
+	(set-buffer orig)))))
+
+(defun browse-kill-ring-mouse-insert (e)
+  "Insert the chosen text in the last selected buffer."
+  (interactive "e")
+  (let* ((end (event-end e))
+	 (win (posn-window end))
+	 (buf (window-buffer win)))
+    (select-window win)
+    (browse-kill-ring-do-insert buf (posn-point end))
+    (browse-kill-ring-quit)))
+
+(defun browse-kill-ring-insert (&optional noquit)
+  "Insert the kill ring item at point, and close the kill ring menu.
+If optional argument NOQUIT is non-nil, don't close the menu."
+  (interactive "P")
+  (browse-kill-ring-do-insert (current-buffer) (point))
+  (unless noquit
+    (browse-kill-ring-quit)))
+
+(defun browse-kill-ring-update ()
+  "Update the buffer to reflect outside changes to `kill-ring'."
+  (interactive)
+  (assert (eq major-mode 'browse-kill-ring-mode))
+  (browse-kill-ring-setup (current-buffer)
+			  browse-kill-ring-original-window))
+
+(defun browse-kill-ring-setup (buf window &optional regexp)
+  (with-current-buffer buf
+    (unwind-protect
+	(progn
+	  (browse-kill-ring-mode)
+	  (setq buffer-read-only nil)
+	  (when (eq browse-kill-ring-display-style
+		    'one-line)
+	    (setq truncate-lines t))
+	  (erase-buffer)
+	  (setq browse-kill-ring-original-window window)
+	  (let ((browse-kill-ring-maximum-display-length
+		 (if (and browse-kill-ring-maximum-display-length
+			  (<= browse-kill-ring-maximum-display-length 3))
+		     4
+		   browse-kill-ring-maximum-display-length))
+		(items (mapcar #'copy-sequence kill-ring)))
+;; 	    (when (not browse-kill-ring-display-duplicates)
+;; 	      (setq items (delete-duplicates items :test #'equal)))
+	    (when (stringp regexp)
+	      (setq items (delq nil
+				(mapcar
+				 #'(lambda (item)
+				     (when (string-match regexp item)
+				       item))
+				 items))))
+	    (funcall (intern
+		      (concat "browse-kill-ring-insert-as-"
+			      (symbol-name browse-kill-ring-display-style)))
+		     items)
+	    (if (not regexp)
+		(message "%s entries in the kill ring" (length kill-ring))
+	      (message "%s (of %s) entries in the kill ring shown"
+		       (length items) (length kill-ring)))
+	    (set-buffer-modified-p nil)
+	    (goto-char (point-min))
+	    (browse-kill-ring-forward 0)
+	    (when regexp
+	      (setq mode-name (concat "Kill Ring [" regexp "]")))
+	    (run-hooks 'browse-kill-ring-hook)))
+      (progn
+	(setq buffer-read-only t)))))
+
+;;;###autoload
+(defun browse-kill-ring ()
+  "Display items in the `kill-ring' in another buffer."
+  (interactive)
+  (let ((orig-buf (current-buffer))
+	(buf (get-buffer-create "*Kill Ring*")))
+    (browse-kill-ring-setup buf (selected-window))
+    (pop-to-buffer buf)
+    nil))
 
 (defcustom backward-delete-char-untabify-method 'untabify
   "*The method for untabifying when deleting backward.
--- font-lock.el.~1.195.~	Fri Apr  5 04:37:40 2002
+++ font-lock.el	Sun Apr 28 22:31:57 2002
@@ -1358,6 +1358,32 @@
       (put-text-property start next prop value object)
       (setq start (text-property-any next end prop nil object)))))
 
+(defun font-lock-fontify-on-text-properties (beg end &rest plist)
+  "Match areas of text which have non-nil text properties with faces.
+Only areas of text between BEG and END are considered.  The remaining
+arguments should form a property list which looks like
+ (PROPERTY FACE PROPERTY FACE ...)."
+  (save-excursion
+    (let ((change-end nil))
+      (while plist
+	(goto-char beg)
+	(while (and plist
+		    (setq change-end (font-lock-fontify-on-text-property
+				      (car plist) (cadr plist) (point) end)))
+	  (goto-char change-end))
+	(setq plist (cddr plist))))))
+
+(defun font-lock-fontify-on-text-property (prop face beg end)
+  "Add face FACE to areas of text which have non-nil text property PROP.
+Only areas of text between BEG and END are considered."
+  (let ((prop-beg (or (and (get-text-property (point) prop) (point))
+		      (next-single-property-change (point) prop nil end))))
+    (when (and prop-beg (not (= prop-beg end)))
+      (let ((prop-end (next-single-property-change beg prop nil end)))
+	(when (and prop-end (not (= prop-end end)))
+	  (put-text-property prop-beg prop-end 'face face)
+	  prop-end)))))
+
 ;; For completeness: this is to `remove-text-properties' as `put-text-property'
 ;; is to `add-text-properties', etc.
 ;(defun remove-text-property (start end property &optional object)
--- bindings.el.~1.100.~	Wed Apr 17 17:38:22 2002
+++ bindings.el	Sun Apr 28 02:09:00 2002
@@ -643,7 +643,7 @@
 (define-key esc-map "w" 'kill-ring-save)
 (define-key esc-map "\C-w" 'append-next-kill)
 (define-key global-map "\C-y" 'yank)
-(define-key esc-map "y" 'yank-pop)
+(define-key esc-map "y" 'yank-previous)
 
 ;; (define-key ctl-x-map "a" 'append-to-buffer)