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;;; images.scm -- Images handling utilities.
;;;
;;; Copyright 2005, 2006, 2007, 2008, 2020 Ludovic Court�s <ludo@gnu.org>
;;; Copyright 2003, 2004 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;
;;;
;;; This file is part of Skribilo.
;;;
;;; Skribilo 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.
;;;
;;; Skribilo 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 Skribilo. If not, see <http://www.gnu.org/licenses/>.
(define-module (skribilo utils images)
#:export (convert-image
*fig-convert-program* *generic-convert-program*)
#:autoload (skribilo utils files) (file-suffix file-prefix)
#:use-module (skribilo parameters)
#:autoload (skribilo condition) (&file-search-error)
#:autoload (srfi srfi-34) (raise)
#:use-module (srfi srfi-35)
#:use-module (srfi srfi-39))
;;; Commentary:
;;;
;;; This module provides convenience functions to handle image files, notably
;;; for format conversion via ImageMagick's `convert'.
;;;
;;; Code:
(define *fig-convert-program* (make-parameter "@FIG2DEV@ -L"))
(define *generic-convert-program* (make-parameter "@CONVERT@"))
(define (builtin-convert-image from fmt dir)
(let* ((s (file-suffix from))
(f (string-append (file-prefix (basename from)) "." fmt))
(to (string-append dir "/" f))) ;; FIXME:
(cond
((string=? s fmt)
to)
((file-exists? to)
to)
(else
(let ((c (if (string=? s "fig")
(string-append (*fig-convert-program*) " "
fmt " " from " > " to)
(string-append (*generic-convert-program*) " "
from " " to))))
(cond
((> (*verbose*) 1)
(format (current-error-port) " [converting image: ~S (~S)]~%" from c))
((> (*verbose*) 0)
(format (current-error-port) " [converting image: ~S]~%" from)))
(and (zero? (system c))
to))))))
(define (convert-image file formats)
(let ((path (search-path (*image-path*) file)))
(if (not path)
(raise (condition (&file-search-error (file-name file)
(path (*image-path*)))))
(let ((suf (file-suffix file)))
(if (member suf formats)
(let* ((dir (if (string? (*destination-file*))
(dirname (*destination-file*))
#f)))
(if dir
(let* ((dest (basename path))
(dest-path (string-append dir "/" dest)))
(if (and (not (string=? path dest-path))
(not (file-exists? dest-path)))
(copy-file path dest-path))
dest)
path))
(let loop ((fmts formats))
(if (null? fmts)
#f
(let* ((dir (if (string? (*destination-file*))
(dirname (*destination-file*))
"."))
(p (builtin-convert-image path (car fmts) dir)))
(if (string? p)
p
(loop (cdr fmts)))))))))))
;;; Local Variables:
;;; coding: latin-1
;;; End:
;;; images.scm ends here
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