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;;; odraw.lisp - 2025-02-11
;; Copyright (C) 2025 Aryadev Chavali
;; 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 General Public License Version 2 for
;; details.
;; You may distribute and modify this code under the terms of the GNU General
;; Public License Version 2, which you should have received a copy of along with
;; this program. If not, please go to <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Implementation of `odraw' package. Defines the entrypoint of the program,
;; handling any input from the user and passing it into the system.
;;; Code:
(in-package :odraw)
(fn read-input (&optional (prompt "> ")) (-> (&optional string) string)
(format t "~a" prompt)
(force-output)
(read-line))
(fn parse-integers (input) (-> (string) list)
(->> input
uiop:split-string
(mapcar #'parse-integer*)
(remove-if #'null)))
(fn read-integers () (-> nil list)
(->> (read-input "Enter numbers: ")
parse-integers))
(fn read-until-integers () (-> nil list)
(let ((inp (read-integers)))
(while (null inp)
(format t "Need at least one integer...~%")
(force-output)
(setq inp (read-integers)))
inp))
(defun start ()
(--> (read-until-integers)
(cons '+ _)
(format t "~a = ~a~%" _ (eval _))))
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