;;; env.el --- functions to manipulate environment variables
;; Copyright (C) 1991, 1994, 2000, 2001, 2002, 2003, 2004,
-;; 2005, 2006 Free Software Foundation, Inc.
+;; 2005, 2006, 2007 Free Software Foundation, Inc.
;; Maintainer: FSF
;; Keywords: processes, unix
;; 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)
+;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
If it is also not t, RET does not exit if it does non-null completion."
(completing-read prompt
(mapcar (lambda (enventry)
- (list (if enable-multibyte-characters
- (decode-coding-string
- (substring enventry 0
- (string-match "=" enventry))
- locale-coding-system t)
- (substring enventry 0
- (string-match "=" enventry)))))
+ (let ((str (substring enventry 0
+ (string-match "=" enventry))))
+ (if (multibyte-string-p str)
+ (decode-coding-string
+ str locale-coding-system t)
+ str)))
(append process-environment
- (frame-parameter (frame-with-environment) 'environment)))
+ ;;(frame-environment)
+ ))
nil mustmatch nil 'read-envvar-name-history))
;; History list for VALUE argument to setenv.
;; Fixme: Should the environment be recoded if LC_CTYPE &c is set?
-(defun setenv (variable &optional value substitute-env-vars frame)
+(defun setenv (variable &optional value substitute-env-vars)
"Set the value of the environment variable named VARIABLE to VALUE.
VARIABLE should be a string. VALUE is optional; if not provided or
nil, the environment variable VARIABLE will be removed.
variables in VALUE with `substitute-env-vars', which see.
This is normally used only for interactive calls.
-If optional parameter FRAME is non-nil, this function modifies
-only the frame-local value of VARIABLE on FRAME, ignoring
-`process-environment'. Note that frames on the same terminal
-device usually share their environment, so calling `setenv' on
-one of them affects the others as well.
-
-If FRAME is nil, `setenv' changes the global value of VARIABLE by
-modifying `process-environment'. Note that the global value
-overrides any frame-local values.
-
The return value is the new value of VARIABLE, or nil if
it was removed from the environment.
+This function works by modifying `process-environment'.
+
As a special case, setting variable `TZ' calls `set-time-zone-rule' as
a side-effect."
(interactive
(error "Environment variable name `%s' contains `='" variable))
(if (string-equal "TZ" variable)
(set-time-zone-rule value))
- (if (null frame)
- (setq process-environment (setenv-internal process-environment
- variable value t))
- (setq frame (frame-with-environment frame))
- (set-frame-parameter frame 'environment
- (setenv-internal (frame-parameter frame 'environment)
- variable value nil)))
+ (setq process-environment (setenv-internal process-environment
+ variable value t))
value)
(defun getenv (variable &optional frame)
(let ((value (getenv-internal (if (multibyte-string-p variable)
(encode-coding-string
variable locale-coding-system)
- variable))))
+ variable)
+ frame)))
(if (and enable-multibyte-characters value)
(setq value (decode-coding-string value locale-coding-system)))
(when (interactive-p)
(message "%s" (if value value "Not set")))
value))
-(defun environment ()
+(defun environment (&optional frame)
"Return a list of environment variables with their values.
Each entry in the list is a string of the form NAME=VALUE.
The returned list can not be used to change environment
variables, only read them. See `setenv' to do that.
+If optional parameter FRAME is non-nil, then it should be a
+frame. The function returns the environment of that frame.
+
The list is constructed by concatenating the elements of
`process-environment' and the 'environment parameter of the
selected frame, and removing duplicated and empty values.
`locale-coding-system', i.e. the elements must normally be decoded for use.
See `setenv' and `getenv'."
(let* ((env (append process-environment
- (frame-parameter (frame-with-environment)
- 'environment)
+ ;; (frame-environment frame)
nil))
(scan env)
prev seen)
scan (cdr scan))))
env))
-(defmacro let-environment (varlist &rest body)
- "Evaluate BODY with environment variables set according to VARLIST.
-The environment variables are then restored to their previous
-values.
-The value of the last form in BODY is returned.
-
-Each element of VARLIST is either a string (which variable is
-then removed from the environment), or a list (NAME
-VALUEFORM) (which sets NAME to the value of VALUEFORM, a string).
-All the VALUEFORMs are evaluated before any variables are set."
- (declare (indent 2))
- (let ((old-env (make-symbol "old-env"))
- (name (make-symbol "name"))
- (value (make-symbol "value"))
- (entry (make-symbol "entry"))
- (frame (make-symbol "frame")))
- `(let ((,frame (selected-frame))
- ,old-env)
- ;; Evaluate VALUEFORMs and replace them in VARLIST with their values.
- (dolist (,entry ,varlist)
- (unless (stringp ,entry)
- (if (cdr (cdr ,entry))
- (error "`let-environment' bindings can have only one value-form"))
- (setcdr ,entry (eval (cadr ,entry)))))
- ;; Set the variables.
- (dolist (,entry ,varlist)
- (let ((,name (if (stringp ,entry) ,entry (car ,entry)))
- (,value (if (consp ,entry) (cdr ,entry))))
- (setq ,old-env (cons (cons ,name (getenv ,name)) ,old-env))
- (setenv ,name ,value)))
- (unwind-protect
- (progn ,@body)
- ;; Restore old values.
- (with-selected-frame (if (frame-live-p ,frame)
- ,frame
- (selected-frame))
- (dolist (,entry ,old-env)
- (setenv (car ,entry) (cdr ,entry))))))))
-
(provide 'env)
-;;; arch-tag: b7d6a8f7-bc81-46db-8e39-8d721d4ed0b8
+;; arch-tag: b7d6a8f7-bc81-46db-8e39-8d721d4ed0b8
;;; env.el ends here