lisp/env.el

   1 ;;; setenv.el --- functions to manipulate environment variables.
   2
   3 ;;; Copyright Free Software Foundation 1991
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: extensions
   7
   8 ;;; This file is part of GNU Emacs.
   9
  10 ;;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;;; it under the terms of the GNU General Public License as published by
  12 ;;; the Free Software Foundation; either version 2, or (at your option)
  13 ;;; any later version.
  14
  15 ;;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;;; GNU General Public License for more details.
  19
  20 ;;; You should have received a copy of the GNU General Public License
  21 ;;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 (defun setenv (variable value)
  27   "Set the value of the environment variable named VARIABLE to VALUE.
  28 VARIABLE and VALUE should both be strings.
  29 This function works by modifying `process-environment'."
  30   (interactive "sSet environment variable: \nsSet %s to value: ")
  31   (if (string-match "=" variable)
  32       (error "Environment variable name contains `='")
  33     (let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
  34           (scan process-environment))
  35       (while scan
  36         (cond
  37          ((string-match pattern (car scan))
  38           (setcar scan (concat variable "=" value))
  39           (setq scan nil))
  40          ((null (setq scan (cdr scan)))
  41           (setq process-environment
  42                 (cons (concat variable "=" value) process-environment))))))))
  43
  44 (provide 'setenv)
  45
  46 ;;; setenv.el ends here