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;;;; running.lisp -- functions for running oneliners
;; Copyright (C) 2022 Colin Okay
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program 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 Affero General Public License for more details.
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
(in-package :oneliners.cli.running)
(defmacro wait-until ((&key (timeout 1) (poll-every 0.01)) &body check)
"Run CHECK every POLL-EVERY seconds until either TIMEOUT seconds
have passed or CHECK returns non-nil."
(let ((clockvar (gensym))
(var (gensym)))
`(loop
for ,clockvar from 0 by ,poll-every to ,timeout
for ,var = (progn ,@check)
when ,var
return ,var
do (sleep ,poll-every)
finally (return nil))))
(defun run-with-shell
(command
&key
shell-name
await-output-p
(output-stream *standard-output*))
"run COMMAND, a string, in a fresh shell environment, initialized
with SHELL-NAME. The output from the command read line by line and is
printed to OUTPUT-STREAM. "
(let ((shell
(uiop:launch-program shell-name :input :stream :output :stream)))
(let ((shell-input (uiop:process-info-input shell))
(shell-output (uiop:process-info-output shell)))
(write-line command shell-input)
(finish-output shell-input)
(when (and await-output-p (plusp await-output-p))
(loop while (wait-until (:timeout await-output-p :poll-every 0.05)
(listen shell-output))
do (princ (read-line shell-output) output-stream)
(terpri output-stream))))))
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