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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 ui)
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-37)
#:use-module (srt2vtt subrip)
#:use-module (srt2vtt webvtt)
#:export (main))
(define (show-help-and-exit)
(format #t "Usage: srt2vtt [OPTIONS]
Convert SubRip formatted subtitles to WebVTT format.~%")
(display "
-h, --help display this help and exit")
(display "
-v, --version display version and exit")
(display "
-i, --input=FILE-NAME read input from FILE-NAME")
(display "
-o, --output=FILE-NAME write output to FILE-NAME")
(newline)
(exit 0))
(define (show-version-and-exit)
(format #t "srt2vtt 0.2~%")
(exit 0))
(define (show-usage-and-exit)
(format #t "Try `srt2vtt --help' for more information.~%")
(exit 1))
(define (show-wrong-args-and-exit)
(format #t "Invalid arguments~%")
(show-usage-and-exit))
(define %default-args
`((input . ,(current-input-port))
(output . ,(current-output-port))))
(define %options
(list (option '(#\h "help") #f #f
(lambda (opt name arg args)
(show-help-and-exit)))
(option '(#\v "version") #f #f
(lambda (opt name arg args)
(show-version-and-exit)))
(option '(#\i "input") #t #f
(lambda (opt name arg args)
(alist-cons 'input arg args)))
(option '(#\o "output") #t #f
(lambda (opt name arg args)
(alist-cons 'output arg args)))))
(define (make-call-with-port-or-file file-proc)
"Create a new procedure that accepts two arguments: a port or file,
and a procedure. When the returned procedure is called with a port as
the first argument, the second argument is simply applied with that
port. If the first argument is a string, the second argument is
applied with the port corresponding to the file name contained in the
string as opened by FILE-PROC."
(lambda (port-or-file proc)
(if (port? port-or-file)
(proc port-or-file)
(file-proc port-or-file proc))))
(define call-with-port-or-input-file
(make-call-with-port-or-file call-with-input-file))
(define call-with-port-or-output-file
(make-call-with-port-or-file call-with-output-file))
(define (parse-opts args)
"Parse the list of ARGS and return a list of option/value pairs.
When an option isn't specified in ARGS, it defaults to the value in
'%default-args'."
(args-fold args
%options
(lambda (opt name arg args)
(error "Unrecognized option '~a'" name))
(lambda (arg args)
(error "Extraneous argument '~a'" arg))
%default-args))
(define (convert input-port output-port)
"Read the SubRip formatted subtitles from INPUT-PORT and write the
WebVTT equivalents to OUTPUT-PORT."
(write-webvtts (read-subrips input-port) output-port))
(define (main args)
"srt2vtt entry point."
(let ((opts (parse-opts args)))
(call-with-port-or-input-file (assoc-ref opts 'input)
(lambda (input-port)
(call-with-port-or-output-file (assoc-ref opts 'output)
(lambda (output-port)
(convert input-port output-port)))))))
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