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;; Calculator for GNU Emacs, part II [calc-undo.el]
;; Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
;; Written by Dave Gillespie, daveg@synaptics.com.
;; This file is part of GNU Emacs.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY. No author or distributor
;; accepts responsibility to anyone for the consequences of using it
;; or for whether it serves any particular purpose or works at all,
;; unless he says so in writing. Refer to the GNU Emacs General Public
;; License for full details.
;; Everyone is granted permission to copy, modify and redistribute
;; GNU Emacs, but only under the conditions described in the
;; GNU Emacs General Public License. A copy of this license is
;; supposed to have been given to you along with GNU Emacs so you
;; can know your rights and responsibilities. It should be in a
;; file named COPYING. Among other things, the copyright notice
;; and this notice must be preserved on all copies.
;; This file is autoloaded from calc-ext.el.
(require 'calc-ext)
(require 'calc-macs)
(defun calc-Need-calc-undo () nil)
;;; Undo.
(defun calc-undo (n)
(interactive "p")
(and calc-executing-macro
(error "Use C-x e, not X, to run a keyboard macro that uses Undo."))
(if (<= n 0)
(if (< n 0)
(calc-redo (- n))
(calc-last-args 1))
(calc-wrapper
(if (null (nthcdr (1- n) calc-undo-list))
(error "No further undo information available"))
(setq calc-undo-list
(prog1
(nthcdr n calc-undo-list)
(let ((saved-stack-top calc-stack-top))
(let ((calc-stack-top 0))
(calc-handle-undos calc-undo-list n))
(setq calc-stack-top saved-stack-top))))
(message "Undo!")))
)
(defun calc-handle-undos (cl n)
(if (> n 0)
(progn
(let ((old-redo calc-redo-list))
(setq calc-undo-list nil)
(calc-handle-undo (car cl))
(setq calc-redo-list (append calc-undo-list old-redo)))
(calc-handle-undos (cdr cl) (1- n))))
)
(defun calc-handle-undo (list)
(and list
(let ((action (car list)))
(cond
((eq (car action) 'push)
(calc-pop-stack 1 (nth 1 action) t))
((eq (car action) 'pop)
(calc-push-list (nth 2 action) (nth 1 action)))
((eq (car action) 'set)
(calc-record-undo (list 'set (nth 1 action)
(symbol-value (nth 1 action))))
(set (nth 1 action) (nth 2 action)))
((eq (car action) 'store)
(let ((v (intern (nth 1 action))))
(calc-record-undo (list 'store (nth 1 action)
(and (boundp v) (symbol-value v))))
(if (y-or-n-p (format "Un-store variable %s? " (nth 1 action)))
(progn
(if (nth 2 action)
(set v (nth 2 action))
(makunbound v))
(calc-refresh-evaltos v)))))
((eq (car action) 'eval)
(calc-record-undo (append (list 'eval (nth 2 action) (nth 1 action))
(cdr (cdr (cdr action)))))
(apply (nth 1 action) (cdr (cdr (cdr action))))))
(calc-handle-undo (cdr list))))
)
(defun calc-redo (n)
(interactive "p")
(and calc-executing-macro
(error "Use C-x e, not X, to run a keyboard macro that uses Redo."))
(if (<= n 0)
(calc-undo (- n))
(calc-wrapper
(if (null (nthcdr (1- n) calc-redo-list))
(error "Unable to redo"))
(setq calc-redo-list
(prog1
(nthcdr n calc-redo-list)
(let ((saved-stack-top calc-stack-top))
(let ((calc-stack-top 0))
(calc-handle-redos calc-redo-list n))
(setq calc-stack-top saved-stack-top))))
(message "Redo!")))
)
(defun calc-handle-redos (cl n)
(if (> n 0)
(progn
(let ((old-undo calc-undo-list))
(setq calc-undo-list nil)
(calc-handle-undo (car cl))
(setq calc-undo-list (append calc-undo-list old-undo)))
(calc-handle-redos (cdr cl) (1- n))))
)
(defun calc-last-args (n)
(interactive "p")
(and calc-executing-macro
(error "Use C-x e, not X, to run a keyboard macro that uses last-args."))
(calc-wrapper
(let ((urec (calc-find-last-x calc-undo-list n)))
(if urec
(calc-handle-last-x urec)
(error "Not enough undo information available"))))
)
(defun calc-handle-last-x (list)
(and list
(let ((action (car list)))
(if (eq (car action) 'pop)
(calc-pop-push-record-list 0 "larg"
(delq 'top-of-stack (nth 2 action))))
(calc-handle-last-x (cdr list))))
)
(defun calc-find-last-x (ul n)
(and ul
(if (calc-undo-does-pushes (car ul))
(if (<= n 1)
(car ul)
(calc-find-last-x (cdr ul) (1- n)))
(calc-find-last-x (cdr ul) n)))
)
(defun calc-undo-does-pushes (list)
(and list
(or (eq (car (car list)) 'pop)
(calc-undo-does-pushes (cdr list))))
)
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