emacs/lisp/emacs-lisp/lucid.el

(defun add-timeout (secs function object &optional resignal)
  (run-at-time secs resignal function object))

(defun disable-timeout (timeout)
  (cancel-timer timeout))

(defun copy-tree (tree)
  (if (consp tree)
      (cons (copy-tree (car tree))
	    (copy-tree (cdr tree)))
    (if (vectorp tree)
	(let ((new (copy-sequence tree))
	      (i (1- (length new))))
	  (while (>= i 0)
	    (aset new i (copy-tree (aref new i)))
	    (setq i (1- i)))
	  new)
      tree)))

(fset 'current-time-seconds 'current-time)

(defun keymap-parent (keymap)
  (let ((tail (cdr keymap)))
    (while (and tail (not (eq (car tail) 'keymap)))
      (setq tail (cdr tail)))
    tail))

(defun set-keymap-parent (keymap new-parent)
  (let ((tail (cdr keymap)))
    (while (and tail (cdr tail) (not (eq (car (cdr tail)) 'keymap)))
      (setq tail (cdr tail)))
    (if tail
	(setcdr tail new-parent))))

(defun remove-hook (hook-var function)
  (if (boundp 'hook-var)
      (set hook-var (delq function (symbol-value hook-var)))))

(defun remprop (symbol prop)
  (let ((plist (symbol-plist symbol)))
    (while (eq (car plist) prop)
      (setplist symbol (setq plist (cdr (cdr plist)))))
    (while plist
      (if (eq (nth 2 plist) prop)
	  (setcdr (cdr plist) (nthcdr 4 plist)))
      (setq plist (cdr (cdr plist))))))