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;;; srt2vtt --- SRT to WebVTT converter
;;; Copyright © 2015 David Thompson <davet@gnu.org>
;;;
;;; srt2vtt 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.
;;;
;;; srt2vtt 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 srt2vtt. If not, see <http://www.gnu.org/licenses/>.
(define-module (srt2vtt webvtt)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-26)
#:use-module (srt2vtt)
#:export (write-webvtt
write-webvtts))
(define (write-time time port)
"Write TIME as a WebVTT formatted timestamp to PORT."
(match time
((h m s ms)
(format port "~a:~a:~a.~a" h m s ms))))
(define (write-webvtt subtitle port)
"Write SUBTITLE as a WebVTT formatted subtitle to PORT."
(format port "~a~%" (subtitle-id subtitle))
(write-time (subtitle-start subtitle) port)
(display " --> " port)
(write-time (subtitle-end subtitle) port)
(newline port)
(format port "~a~%" (string-join (subtitle-text subtitle) "\n"))
(newline port))
(define (write-webvtts subtitles port)
"Write all SUBTITLES as WebVTT formatted subtitles to PORT."
(format port "WEBVTT~%~%")
(for-each (cut write-webvtt <> port) subtitles))
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