67 lines
2.3 KiB
Scheme
67 lines
2.3 KiB
Scheme
;;; Gash --- Guile As SHell
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;;; Copyright © 2018 R.E.W. van Beusekom <rutger.van.beusekom@gmail.com>
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;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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;;;
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;;; This file is part of Gash.
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;;;
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;;; Gash 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 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; Gash is distributed in the hope that it will be useful, but WITHOUT ANY
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;;; WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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;;; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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;;; details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Gash. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gash environment)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (gash io)
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#:export (
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%global-variables
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assignment
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set-shell-opt!
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shell-opt?
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variable
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))
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;; FIXME: export/env vs set
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(define %global-variables
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(map identity ;; FIXME: make mutable
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`(,(cons "SHELLOPTS" "")
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,(cons "PIPESTATUS" "([0]=\"0\"")
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,(cons "?" "0")
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,@(map (lambda (key-value)
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(let* ((key-value (string-split key-value #\=))
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(key (car key-value))
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(value (cadr key-value)))
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(cons key value)))
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(environ)))))
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(define (assignment name value)
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(set! %global-variables
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(assoc-set! %global-variables name value))
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#t)
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(define (variable name)
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(let ((name (if (string-prefix? "$" name) (string-drop name 1) name)))
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(or (assoc-ref %global-variables name) "")))
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(define (set-shell-opt! name set?)
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(let* ((shell-opts (variable "SHELLOPTS"))
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(options (if (string-null? shell-opts) '()
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(string-split shell-opts #\:)))
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(new-options (if set? (delete-duplicates (sort (cons name options) string<))
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(filter (negate (cut equal? <> name)) options)))
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(new-shell-opts (string-join new-options ":")))
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(assignment "SHELLOPTS" new-shell-opts)))
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(define (shell-opt? name)
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(member name (string-split (assoc-ref %global-variables "SHELLOPTS") #\:)))
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