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;;; The Inevitable Game
;;; Copyright © 2018 Ricardo Wurmus <rekado@elephly.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU 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
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (utils)
#:use-module (srfi srfi-1)
#:use-module (ice-9 match)
#:use-module (config)
#:export (arrange-text))
(define* (arrange-text text #:key
(character-width 8.0)
(margin 0.0)
(max-width %width))
"Take the string TEXT and split it at spaces so that it fits in the
given MAX-WIDTH. Return a list of lines."
(match (fold (lambda (chunk acc)
(match acc
((#:width width #:result (and (current-line . tail) lines))
(let* ((len (+ 1 (string-length chunk)))
(chunk-width (* len character-width))
(new-width (+ chunk-width width)))
(if (< (+ new-width margin) max-width)
`(#:width ,new-width
#:result ,(cons (string-append current-line " " chunk) tail))
`(#:width ,chunk-width
#:result ,(cons chunk lines)))))))
'(#:width 0 #:result (""))
(string-tokenize text))
((#:width _ #:result lines)
(reverse lines))))
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