-;;; 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
+;;; env.el --- functions to manipulate environment variables
+
+;; Copyright (C) 1991, 1994 Free Software Foundation, Inc.
+
+;; 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, 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.
+
+;;; 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)
+
+(defun setenv (variable &optional value unset)
+ "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.
+
+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-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)
+ (let ((pattern (concat "\\`" (regexp-quote (concat 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)
+ (if (eq nil value)
+ (setq process-environment (delq (car scan) process-environment))
+ (setcar scan (concat variable "=" value)))
+ (setq scan nil)))
+ (setq scan (cdr scan)))
+ (or found
+ (if value
+ (setq process-environment
+ (cons (concat variable "=" value)
+ process-environment)))))))
+
+(defun getenv (variable)
+ "Get the value of environment variable VARIABLE.
+VARIABLE should be a string. Value is nil if VARIABLE is undefined in
+the environment. Otherwise, value is a string.
+
+This function consults the variable `process-environment'
+for its value."
+ (interactive (list (read-envvar-name "Get environment variable: " t)))
+ (let ((value (getenv-internal variable)))
+ (when (interactive-p)
+ (message "%s" (if value value "Not set")))
+ value))
+
+(provide 'env)
+
+;;; env.el ends here
HCoop / bpt / emacs.git / blobdiff