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;;;; main.lisp -- oneliners.cli entrypoint
(defpackage oneliners.cli
(:use :cl))
(in-package :oneliners.cli)
;;; CLI OPTIONS
;; (opts:define-opts
;; (:name ))
;;; UTILITIES
(defun parent-process-name ()
"Prints the name of the parent process of the current process."
(let ((ppidfile (format nil "/proc/~a/status" (osicat-posix:getppid))))
(first (last
(ppcre:split "\\s"
(with-open-file (input ppidfile)
(read-line input)))))))
(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))))
(defun run-with-shell
(command
&key
(shell-name (parent-process-name))
(await-output-p 0.8)
(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)))
(symbol-macrolet ((shell-input (uiop:process-info-input shell))
(shell-output (uiop:process-info-output shell)))
(write-line command shell-input)
(finish-output shell-input)
(when await-output-p
(wait-until (:timeout await-output-p :poll-every 0.005)
(listen shell-output))
(loop while (listen shell-output)
do (princ (read-line shell-output) output-stream)
(terpri output-stream))))))
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