Modularize!

[srt2vtt.git] / srt2vtt / webvtt.scm

diff --git a/srt2vtt/webvtt.scm b/srt2vtt/webvtt.scm
new file mode 100644 (file)
index 0000000..f4cd91b
--- /dev/null
+++ b/srt2vtt/webvtt.scm
@@ -0,0 +1,45 @@
+;;; 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))