68 lines
2.2 KiB
Scheme
68 lines
2.2 KiB
Scheme
;;; Gash -- Guile As SHell
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;;; Copyright © 2018 Timothy Sample <samplet@ngyro.com>
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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
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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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;;; Gash 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 Gash. If not, see <http://www.gnu.org/licenses/>.
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(define-module (gash built-ins trap)
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#:use-module (gash environment)
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#:use-module (ice-9 match))
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;;; Commentary:
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;;;
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;;; The 'trap' utility.
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;;;
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;;; Code:
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(define sh:eval (@@ (gash built-ins eval) main))
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(define (action->handler action)
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(let ((n (string->number action)))
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(cond
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((and n (integer? n) (>= n 0)) SIG_DFL)
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((string=? action "-") SIG_DFL)
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((string-null? action) SIG_IGN)
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(else (lambda () (sh:eval action))))))
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(define (condition->signum condition)
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(let ((n (string->number condition)))
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(cond
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((and n (integer? n)) n)
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((string-ci=? condition "EXIT") 0)
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(else (let* ((name (if (string-prefix-ci? "SIG" condition)
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(string-upcase condition)
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(string-append "SIG" (string-upcase condition))))
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(symb (string->symbol name)))
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(or (and=> (module-variable (current-module) symb)
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variable-ref)
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-1))))))
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(define (main . args)
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(match args
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(() "print")
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(("--" . args) (main args))
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((action conditions ..1)
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(let ((handler (action->handler action)))
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(for-each (lambda (condition)
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(match (condition->signum condition)
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(0 (set-atexit! handler))
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(n (sigaction n handler))))
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conditions))
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EXIT_SUCCESS)
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(_ (format (current-error-port)
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"~a: trap: Invalid options ~s.~%"
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(car (program-arguments)) args)
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EXIT_FAILURE)))
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