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(setenv): Simplify reading of args by passing old value as the default.

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Richard M. Stallman 1998-03-17 08:14:28 +00:00
parent 85cac557cd
commit 80370c1cec
1 changed files with 4 additions and 22 deletions
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26
lisp/env.el
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@ -63,29 +63,11 @@ This function works by modifying `process-environment'."
(interactive
(if current-prefix-arg
(list (read-envvar-name "Clear environment variable: " 'exact) nil t)
(let* ((var (read-envvar-name "Set environment variable: " nil))
(oldval (getenv var))
newval
oldhist)
;; Don't put the current value on the history
;; if it is already there.
(if (equal oldval (car setenv-history))
(setq oldval nil))
;; Now if OLDVAL is non-nil, we should add it to the history.
(if oldval
(setq setenv-history (cons oldval setenv-history)))
(setq oldhist setenv-history)
(setq newval (read-from-minibuffer (format "Set %s to value: " var)
nil nil nil 'setenv-history))
;; If we added the current value to the history, remove it.
;; Note that read-from-minibuffer may have added the new value.
;; Don't remove that!
(if oldval
(if (eq oldhist setenv-history)
(setq setenv-history (cdr setenv-history))
(setcdr setenv-history (cdr (cdr setenv-history)))))
(let ((var (read-envvar-name "Set environment variable: " nil)))
;; Here finally we specify the args to give call setenv with.
(list var newval))))
(list var (read-from-minibuffer (format "Set %s to value: " var)
nil nil nil 'setenv-history
(getenv var))))))
(if unset (setq value nil))
(if (string-match "=" variable)
(error "Environment variable name `%s' contains `='" variable)