36 lines
1.2 KiB
Scheme
36 lines
1.2 KiB
Scheme
;;; The Geesh Shell Interpreter
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;;; Copyright 2018 Timothy Sample <samplet@ngyro.com>
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;;;
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;;; This file is part of Geesh.
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;;;
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;;; Geesh is free software: you can redistribute it and/or modify
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;;; it 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
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;;; (at your option) any later version.
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;;;
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;;; Geesh is distributed in the hope that it will be useful,
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;;; but 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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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with Geesh. If not, see <http://www.gnu.org/licenses/>.
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(define-module (geesh built-ins utils)
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#:use-module (ice-9 match)
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#:export (split-assignment))
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;;; Commentary:
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;;;
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;;; Utility functions shared by built-ins.
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;;;
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;;; Code:
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(define (split-assignment assignment)
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(match (string-index assignment #\=)
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(#f (values assignment #f))
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(index (let ((name (substring assignment 0 index)))
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(match (substring assignment (1+ index))
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((? string-null?) (values name #f))
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(value (values name value)))))))
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