1 ;;; srt2vtt --- SRT to WebVTT converter
2 ;;; Copyright © 2015 David Thompson <davet@gnu.org>
4 ;;; srt2vtt is free software; you can redistribute it and/or modify it
5 ;;; under the terms of the GNU General Public License as published by
6 ;;; the Free Software Foundation; either version 3 of the License, or
7 ;;; (at your option) any later version.
9 ;;; srt2vtt is distributed in the hope that it will be useful, but
10 ;;; WITHOUT ANY WARRANTY; without even the implied warranty of
11 ;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 ;;; General Public License for more details.
14 ;;; You should have received a copy of the GNU General Public License
15 ;;; along with srt2vtt. If not, see <http://www.gnu.org/licenses/>.
17 (define-module (srt2vtt ui)
18 #:use-module (ice-9 format)
19 #:use-module (ice-9 match)
20 #:use-module (srfi srfi-1)
21 #:use-module (srfi srfi-37)
22 #:use-module (srt2vtt subrip)
23 #:use-module (srt2vtt webvtt)
26 (define (show-help-and-exit)
27 (format #t "Usage: srt2vtt [OPTIONS]
28 Convert SubRip formatted subtitles to WebVTT format.~%")
30 -h, --help display this help and exit")
32 -v, --version display version and exit")
34 -i, --input=FILE-NAME read input from FILE-NAME")
36 -o, --output=FILE-NAME write output to FILE-NAME")
40 (define (show-version-and-exit)
41 (format #t "srt2vtt 0.1~%")
44 (define (show-usage-and-exit)
45 (format #t "Try `srt2vtt --help' for more information.~%")
48 (define (show-wrong-args-and-exit)
49 (format #t "Invalid arguments~%")
50 (show-usage-and-exit))
53 `((input . ,(current-input-port))
54 (output . ,(current-output-port))))
57 (list (option '(#\h "help") #f #f
58 (lambda (opt name arg args)
59 (show-help-and-exit)))
60 (option '(#\v "version") #f #f
61 (lambda (opt name arg args)
62 (show-version-and-exit)))
63 (option '(#\i "input") #t #f
64 (lambda (opt name arg args)
65 (alist-cons 'input arg args)))
66 (option '(#\o "output") #t #f
67 (lambda (opt name arg args)
68 (alist-cons 'output arg args)))))
70 (define (make-call-with-port-or-file file-proc)
71 "Create a new procedure that accepts two arguments: a port or file,
72 and a procedure. When the returned procedure is called with a port as
73 the first argument, the second argument is simply applied with that
74 port. If the first argument is a string, the second argument is
75 applied with the port corresponding to the file name contained in the
76 string as opened by FILE-PROC."
77 (lambda (port-or-file proc)
78 (if (port? port-or-file)
80 (file-proc port-or-file proc))))
82 (define call-with-port-or-input-file
83 (make-call-with-port-or-file call-with-input-file))
85 (define call-with-port-or-output-file
86 (make-call-with-port-or-file call-with-output-file))
88 (define (parse-opts args)
89 "Parse the list of ARGS and return a list of option/value pairs.
90 When an option isn't specified in ARGS, it defaults to the value in
94 (lambda (opt name arg args)
95 (error "Unrecognized option '~a'" name))
97 (error "Extraneous argument '~a'" arg))
100 (define (convert input-port output-port)
101 "Read the SubRip formatted subtitles from INPUT-PORT and write the
102 WebVTT equivalents to OUTPUT-PORT."
103 (write-webvtts (read-subrips input-port) output-port))
106 "srt2vtt entry point."
107 (let ((opts (parse-opts args)))
108 (call-with-port-or-input-file (assoc-ref opts 'input)
110 (call-with-port-or-output-file (assoc-ref opts 'output)
111 (lambda (output-port)
112 (convert input-port output-port)))))))