diff options
Diffstat (limited to 'tissue/utils.scm')
-rw-r--r-- | tissue/utils.scm | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tissue/utils.scm b/tissue/utils.scm new file mode 100644 index 0000000..5fce26d --- /dev/null +++ b/tissue/utils.scm @@ -0,0 +1,45 @@ +;;; 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)) + +(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)))) |