mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-11 09:20:51 +00:00
58 lines
2.1 KiB
EmacsLisp
58 lines
2.1 KiB
EmacsLisp
;;; env.el --- functions to manipulate environment variables.
|
|
|
|
;;; Copyright Free Software Foundation 1991
|
|
|
|
;; Maintainer: FSF
|
|
;; Keywords: processes, unix
|
|
|
|
;;; 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 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.
|
|
|
|
;;; 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.
|
|
|
|
;;; Code:
|
|
|
|
;;;###autoload
|
|
(defun setenv (variable &optional value)
|
|
"Set the value of the environment variable named VARIABLE to VALUE.
|
|
VARIABLE should be a string. VALUE is optional; if not provided or is
|
|
`nil', the environment variable VARIABLE will be removed.
|
|
This function works by modifying `process-environment'."
|
|
(interactive "sSet environment variable: \nsSet %s to value: ")
|
|
(if (string-match "=" variable)
|
|
(error "Environment variable name `%s' contains `='" variable)
|
|
(let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
|
|
(scan process-environment))
|
|
(while scan
|
|
(cond
|
|
((string-match pattern (car scan))
|
|
(if (eq nil value)
|
|
(setq process-environment (delq (car scan) process-environment))
|
|
(setcar scan (concat variable "=" value)))
|
|
(setq scan nil))
|
|
((null (setq scan (cdr scan)))
|
|
(setq process-environment
|
|
(cons (concat variable "=" value) process-environment))))))))
|
|
|
|
(provide 'env)
|
|
|
|
;;; env.el ends here
|