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;;;; prompt.lisp -- a function using readlline to collect text from the user
;; 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.prompt)
(defun prompt (prompt
&key
(expect (constantly t))
retry-text
(prefill ""))
;; register a prefill hook
(rl:register-hook
:pre-input
(lambda ()
(rl:insert-text prefill)
(rl:redisplay)))
(unwind-protect
(loop
with prompt-text = prompt
with should-retry-p = t
while should-retry-p
for line = (rl:readline :prompt prompt-text)
when (funcall expect line)
do (setf should-retry-p nil)
when retry-text
do (setf prompt-text retry-text)
finally (return line))
;; unregisters the hook.
(rl:register-hook :pre-input nil)))
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