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;;;; prompt.lisp -- a function using readlline to collect text from the user
(defpackage #:oneliners.cli.prompt
(:use #:cl)
(:local-nicknames (#:rl #:cl-readline))
(:export #:prompt))
(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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