;;; env.el --- functions to manipulate environment variables.
-;;; Copyright 1991, 1994 Free Software Foundation, Inc.
+;; Copyright (C) 1991, 1994 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: processes, unix
-;;; This file is part of GNU Emacs.
+;; This file is part of GNU Emacs.
-;;; GNU Emacs is free software; you can redistribute it and/or modify
-;;; it under the terms of the GNU General Public License as published by
-;;; the Free Software Foundation; either version 2, or (at your option)
-;;; any later version.
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
-;;; GNU Emacs is distributed in the hope that it will be useful,
-;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
-;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;;; GNU General Public License for more details.
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+;; GNU General Public License for more details.
-;;; You should have received a copy of the GNU General Public License
-;;; along with GNU Emacs; see the file COPYING. If not, write to
-;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
;;; Commentary:
-;; UNIX processes inherit a list of name-to-string associations from
-;; their parents called their `environment'; these are commonly used
-;; to control program options. This package permits you to set
-;; environment variables to be passed to any sub-process run under Emacs.
+;; UNIX processes inherit a list of name-to-string associations from their
+;; parents called their `environment'; these are commonly used to control
+;; program options. This package permits you to set environment variables
+;; to be passed to any sub-process run under Emacs.
;;; Code:
;; History list for VALUE argument to setenv.
(defvar setenv-history nil)
-;;;###autoload
(defun setenv (variable &optional value unset)
"Set the value of the environment variable named VARIABLE to VALUE.
VARIABLE should be a string. VALUE is optional; if not provided or is
(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)
(case-fold-search nil)
(scan process-environment)
found)
+ (if (string-equal "TZ" variable)
+ (set-time-zone-rule value))
(while scan
(cond ((string-match pattern (car scan))
(setq found t)
(cons (concat variable "=" value)
process-environment)))))))
+(defun getenv (variable)
+ "Get the value of environment variable VARIABLE.
+VARIABLE should be a string. Value is nil if VARIABLE is undefined in
+the environment. Otherwise, value is a string.
+
+This function consults the variable `process-environment'
+for its value."
+ (interactive (list (read-envvar-name "Get environment variable: " t)))
+ (let ((value (getenv-internal variable)))
+ (when (interactive-p)
+ (message "%s" (if value value "Not set")))
+ value))
+
(provide 'env)
;;; env.el ends here