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;; This file is part of Idest
;; Copyright (C) 2011 Sergey Poznyakoff
;;
;; Idest 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, or (at your option)
;; any later version.
;;
;; Idest 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 Idest. If not, see <http://www.gnu.org/licenses/>.
(define-module (idest format lyrics))
(use-modules (ice-9 getopt-long)
(ice-9 popen))
(define-public idest-main #f)
(let* ((cmd (command-line))
(progname (car cmd))
(lang #f)
(condesc #f)
(grammar `((lang (single-char #\l) (value #t))
(content (single-char #\c) (value #t))
(help (single-char #\h)))))
(catch 'misc-error
(lambda ()
(for-each
(lambda (x)
(case (car x)
((file)
(set! file (cdr x)))
((lang)
(set! lang (cdr x)))
((content)
(set! condesc (cdr x)))
((help)
(format #t "usage: idest --format=~A [OPTIONS] FILE...\n"
progname)
(format #t "displays the USLT (unsynchronised lyric text) frame\n")
(format #t "OPTIONS are:\n")
(format #t " -l, --lang NAME set language in which the lyrics is writen (default: eng)\n")
(format #t " -c, --content TEXT set content description\n")
(exit 0))
(else
(set-program-arguments (cons progname (cdr x))))))
(getopt-long cmd grammar)))
(lambda (key . args)
(with-output-to-port
(current-error-port)
(lambda ()
(format #t "~A: " progname)
(apply format #t (list-ref args 1) (list-ref args 2))
(newline)
(exit 1)))))
(set! idest-main
(lambda (name frames)
(force-output (current-output-port))
(force-output (current-error-port))
(letrec ((title #f)
(print-lyrics (lambda (text)
(display (or title name))
(newline)
(newline)
(display text)
(newline))))
(call-with-current-continuation
(lambda (return)
(for-each
(lambda (elt)
(let ((frame-name (car elt))
(frame-attr (cdr elt)))
(cond
((string=? frame-name "TIT2")
(set! title (assoc-ref frame-attr 'text)))
((and (string=? frame-name "USLT")
(or (not lang)
(string=? lang (assoc-ref frame-attr 'lang)))
(or (not condesc)
(string=? condesc
(assoc-ref frame-attr 'condesc))))
(let ((text (assoc-ref frame-attr 'text)))
(cond
((getenv "PAGER") =>
(lambda (pag)
(let ((port (open-output-pipe pag)))
(with-output-to-port
port
(lambda ()
(print-lyrics text)))
(close-pipe port))))
(else
(print-lyrics text)))
(return))))))
frames)
(format (current-error-port) "~A: no lyrics~%" name)))))))
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