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;; Calculator for GNU Emacs, part II [calcundo.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 calcext.el.
(require 'calcext)
(require 'calcmacs)
(defun calcNeedcalcundo () nil)
;;; Undo.
(defun calcundo (n)
(interactive "p")
(and calcexecutingmacro
(error "Use Cx e, not X, to run a keyboard macro that uses Undo."))
(if (<= n 0)
(if (< n 0)
(calcredo ( n))
(calclastargs 1))
(calcwrapper
(if (null (nthcdr (1 n) calcundolist))
(error "No further undo information available"))
(setq calcundolist
(prog1
(nthcdr n calcundolist)
(let ((savedstacktop calcstacktop))
(let ((calcstacktop 0))
(calchandleundos calcundolist n))
(setq calcstacktop savedstacktop))))
(message "Undo!")))
)
(defun calchandleundos (cl n)
(if (> n 0)
(progn
(let ((oldredo calcredolist))
(setq calcundolist nil)
(calchandleundo (car cl))
(setq calcredolist (append calcundolist oldredo)))
(calchandleundos (cdr cl) (1 n))))
)
(defun calchandleundo (list)
(and list
(let ((action (car list)))
(cond
((eq (car action) 'push)
(calcpopstack 1 (nth 1 action) t))
((eq (car action) 'pop)
(calcpushlist (nth 2 action) (nth 1 action)))
((eq (car action) 'set)
(calcrecordundo (list 'set (nth 1 action)
(symbolvalue (nth 1 action))))
(set (nth 1 action) (nth 2 action)))
((eq (car action) 'store)
(let ((v (intern (nth 1 action))))
(calcrecordundo (list 'store (nth 1 action)
(and (boundp v) (symbolvalue v))))
(if (yornp (format "Unstore variable %s? " (nth 1 action)))
(progn
(if (nth 2 action)
(set v (nth 2 action))
(makunbound v))
(calcrefreshevaltos v)))))
((eq (car action) 'eval)
(calcrecordundo (append (list 'eval (nth 2 action) (nth 1 action))
(cdr (cdr (cdr action)))))
(apply (nth 1 action) (cdr (cdr (cdr action))))))
(calchandleundo (cdr list))))
)
(defun calcredo (n)
(interactive "p")
(and calcexecutingmacro
(error "Use Cx e, not X, to run a keyboard macro that uses Redo."))
(if (<= n 0)
(calcundo ( n))
(calcwrapper
(if (null (nthcdr (1 n) calcredolist))
(error "Unable to redo"))
(setq calcredolist
(prog1
(nthcdr n calcredolist)
(let ((savedstacktop calcstacktop))
(let ((calcstacktop 0))
(calchandleredos calcredolist n))
(setq calcstacktop savedstacktop))))
(message "Redo!")))
)
(defun calchandleredos (cl n)
(if (> n 0)
(progn
(let ((oldundo calcundolist))
(setq calcundolist nil)
(calchandleundo (car cl))
(setq calcundolist (append calcundolist oldundo)))
(calchandleredos (cdr cl) (1 n))))
)
(defun calclastargs (n)
(interactive "p")
(and calcexecutingmacro
(error "Use Cx e, not X, to run a keyboard macro that uses lastargs."))
(calcwrapper
(let ((urec (calcfindlastx calcundolist n)))
(if urec
(calchandlelastx urec)
(error "Not enough undo information available"))))
)
(defun calchandlelastx (list)
(and list
(let ((action (car list)))
(if (eq (car action) 'pop)
(calcpoppushrecordlist 0 "larg"
(delq 'topofstack (nth 2 action))))
(calchandlelastx (cdr list))))
)
(defun calcfindlastx (ul n)
(and ul
(if (calcundodoespushes (car ul))
(if (<= n 1)
(car ul)
(calcfindlastx (cdr ul) (1 n)))
(calcfindlastx (cdr ul) n)))
)
(defun calcundodoespushes (list)
(and list
(or (eq (car (car list)) 'pop)
(calcundodoespushes (cdr list))))
)
