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#| environ.jl -- Functions to manipulate the process-environment
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$Id: environ.jl,v 1.7 2000/08/13 19:14:52 john Exp $
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Copyright (C) 1998 John Harper <john@dcs.warwick.ac.uk>
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This file is part of librep.
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librep is free software; you can redistribute it and/or modify it
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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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librep is distributed in the hope that it will be useful, but
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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 librep; 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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(declare (in-module rep.system))
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(open-structures '(rep.regexp
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"Return the value of the environment variable NAME, a string. The variable
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`process-environment' is used to find the value."
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(let ((regexp (concat (quote-regexp name) ?=)))
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(let loop ((rest process-environment))
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(cond ((null rest) nil)
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((string-looking-at regexp (car rest))
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(substring (car rest) (match-end)))
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(t (loop (cdr rest)))))))
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(defun setenv (name value)
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"Set the current value of the environment variable NAME to the string VALUE.
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The `process-environment' variable is destructively modified."
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(let ((regexp (concat (quote-regexp name) ?=)))
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(let loop ((rest process-environment))
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(setq process-environment (cons (concat name #\= value)
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process-environment)))
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((string-looking-at regexp (car rest))
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(rplaca rest (concat name #\= value)))
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(t (loop (cdr rest)))))))
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(defun unsetenv (name)
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"Delete the environment variable called NAME."
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(let ((re (concat (quote-regexp name) ?=)))
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(setq process-environment
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(delete-if (lambda (x)
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(string-looking-at re x)) process-environment))))
added
removed
lisp/rep/system/environ.jl
