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;;; tissue --- Text based issue tracker
;;; Copyright © 2022 Arun Isaac <arunisaac@systemreboot.net>
;;;
;;; This file is part of tissue.
;;;
;;; tissue is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation, either version 3 of the License, or
;;; (at your option) any later version.
;;;
;;; tissue is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with tissue. If not, see <https://www.gnu.org/licenses/>.
(define-module (tissue utils)
#:use-module (rnrs io ports)
#:use-module (srfi srfi-26)
#:use-module (ice-9 popen)
#:export (call-with-input-pipe
get-line-dos-or-unix
memoize-thunk))
(define (call-with-input-pipe proc program . args)
"Execute PROGRAM ARGS ... in a subprocess with a pipe to it. Call
PROC with an input port to that pipe. Close the pipe once PROC exits,
even if it exits non-locally. Return the value returned by PROC."
(let ((port #f))
(dynamic-wind (lambda () (set! port (apply open-pipe* OPEN_READ program args)))
(cut proc port)
(lambda ()
(let ((return-value (status:exit-val (close-pipe port))))
(unless (and return-value
(zero? return-value))
(error "Invocation of program failed" (cons program args))))))))
(define (get-line-dos-or-unix port)
"Read line from PORT. This differs from `get-line' in (rnrs io
ports) in that it also supports DOS line endings."
(let ((line (get-line port)))
(if (eof-object? line)
line
(string-trim-right line #\return))))
(define (memoize-thunk thunk)
"Return a function memoizing THUNK."
(let ((result #f))
(lambda ()
(unless result
(set! result (thunk)))
result)))
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