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109 lines
4.0 KiB
EmacsLisp
109 lines
4.0 KiB
EmacsLisp
;;; env.el --- functions to manipulate environment variables.
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;; Copyright (C) 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 the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; UNIX processes inherit a list of name-to-string associations from their
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;; parents called their `environment'; these are commonly used to control
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;; program options. This package permits you to set environment variables
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;; to be passed to any sub-process run under Emacs.
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;;; Code:
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;; History list for environment variable names.
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(defvar read-envvar-name-history nil)
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(defun read-envvar-name (prompt &optional mustmatch)
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"Read environment variable name, prompting with PROMPT.
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Optional second arg MUSTMATCH, if non-nil, means require existing envvar name.
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If it is also not t, RET does not exit if it does non-null completion."
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(completing-read prompt
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(mapcar (function
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(lambda (enventry)
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(list (substring enventry 0
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(string-match "=" enventry)))))
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process-environment)
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nil mustmatch nil 'read-envvar-name-history))
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;; History list for VALUE argument to setenv.
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(defvar setenv-history nil)
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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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Interactively, the current value (if any) of the variable
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appears at the front of the history list when you type in the new value.
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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-envvar-name "Clear environment variable: " 'exact) nil t)
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(let ((var (read-envvar-name "Set environment variable: " nil)))
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;; Here finally we specify the args to give call setenv with.
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(list var (read-from-minibuffer (format "Set %s to value: " var)
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nil nil nil 'setenv-history
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(getenv 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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(if (string-equal "TZ" variable)
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(set-time-zone-rule value))
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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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(defun getenv (variable)
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"Get the value of environment variable VARIABLE.
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VARIABLE should be a string. Value is nil if VARIABLE is undefined in
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the environment. Otherwise, value is a string.
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This function consults the variable `process-environment'
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for its value."
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(interactive (list (read-envvar-name "Get environment variable: " t)))
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(let ((value (getenv-internal variable)))
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(when (interactive-p)
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(message "%s" (if value value "Not set")))
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value))
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(provide 'env)
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;;; env.el ends here
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