module/srfi/srfi-98.scm

   1 ;;; srfi-98.scm --- An interface to access environment variables
   2
   3 ;; Copyright (C) 2009 Free Software Foundation, Inc.
   4 ;;
   5 ;; This library is free software; you can redistribute it and/or
   6 ;; modify it under the terms of the GNU Lesser General Public
   7 ;; License as published by the Free Software Foundation; either
   8 ;; version 3 of the License, or (at your option) any later version.
   9 ;;
  10 ;; This library is distributed in the hope that it will be useful,
  11 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 ;; Lesser General Public License for more details.
  14 ;;
  15 ;; You should have received a copy of the GNU Lesser General Public
  16 ;; License along with this library; if not, write to the Free Software
  17 ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18
  19 ;;; Author: Julian Graham <julian.graham@aya.yale.edu>
  20 ;;; Date: 2009-05-26
  21
  22 ;;; Commentary:
  23
  24 ;; This is an implementation of SRFI-98 (An interface to access environment
  25 ;; variables).
  26 ;;
  27 ;; This module is fully documented in the Guile Reference Manual.
  28
  29 ;;; Code:
  30
  31 (define-module (srfi srfi-98)
  32   :use-module (srfi srfi-1)
  33   :export (get-environment-variable
  34            get-environment-variables))
  35
  36 (cond-expand-provide (current-module) '(srfi-98))
  37
  38 (define get-environment-variable getenv)
  39 (define (get-environment-variables)
  40   (define (string->alist-entry str)
  41     (let ((pvt (string-index str #\=))
  42           (len (string-length str)))
  43       (and pvt (cons (substring str 0 pvt) (substring str (+ pvt 1) len)))))
  44   (filter-map string->alist-entry (environ)))