;;; 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 environment variable names.
+(defvar read-envvar-name-history nil)
+
+(defun read-envvar-name (prompt &optional mustmatch)
+ "Read environment variable name, prompting with PROMPT.
+Optional second arg MUSTMATCH, if non-nil, means require existing envvar name.
+If it is also not t, RET does not exit if it does non-null completion."
+ (completing-read prompt
+ (mapcar (function
+ (lambda (enventry)
+ (list (substring enventry 0
+ (string-match "=" enventry)))))
+ process-environment)
+ nil mustmatch nil 'read-envvar-name-history))
+
+;; 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.
`nil', the environment variable VARIABLE will be removed.
Interactively, a prefix argument means to unset the variable.
+Interactively, the current value (if any) of the variable
+appears at the front of the history list when you type in the new value.
+
This function works by modifying `process-environment'."
(interactive
(if current-prefix-arg
- (list (read-string "Clear environment variable: ") nil t)
- (let ((var (read-string "Set environment variable: ")))
- (list var (read-string (format "Set %s to value: " var))))))
+ (list (read-envvar-name "Clear environment variable: " 'exact) nil t)
+ (let ((var (read-envvar-name "Set environment variable: " nil)))
+ ;; Here finally we specify the args to give call setenv with.
+ (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)