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70 lines
2.5 KiB
EmacsLisp
70 lines
2.5 KiB
EmacsLisp
;;; env.el --- functions to manipulate environment variables.
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;;; Copyright 1991, 1994 Free Software Foundation, Inc.
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;; Maintainer: FSF
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;; Keywords: processes, unix
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;;; This file is part of GNU Emacs.
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;;; GNU Emacs is free software; you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 2, or (at your option)
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;;; any later version.
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;;; GNU Emacs is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Emacs; see the file COPYING. If not, write to
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;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;;; Commentary:
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;; UNIX processes inherit a list of name-to-string associations from
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;; their parents called their `environment'; these are commonly used
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;; to control program options. This package permits you to set
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;; environment variables to be passed to any sub-process run under Emacs.
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;;; Code:
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;;;###autoload
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(defun setenv (variable &optional value unset)
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"Set the value of the environment variable named VARIABLE to VALUE.
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VARIABLE should be a string. VALUE is optional; if not provided or is
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`nil', the environment variable VARIABLE will be removed.
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Interactively, a prefix argument means to unset the variable.
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This function works by modifying `process-environment'."
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(interactive
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(if current-prefix-arg
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(list (read-string "Clear environment variable: ") nil t)
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(let ((var (read-string "Set environment variable: ")))
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(list var (read-string (format "Set %s to value: " var))))))
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(if unset (setq value nil))
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(if (string-match "=" variable)
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(error "Environment variable name `%s' contains `='" variable)
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(let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
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(case-fold-search nil)
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(scan process-environment)
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found)
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(while scan
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(cond ((string-match pattern (car scan))
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(setq found t)
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(if (eq nil value)
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(setq process-environment (delq (car scan) process-environment))
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(setcar scan (concat variable "=" value)))
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(setq scan nil)))
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(setq scan (cdr scan)))
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(or found
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(if value
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(setq process-environment
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(cons (concat variable "=" value)
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process-environment)))))))
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(provide 'env)
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;;; env.el ends here
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