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;;; lncs.scm  --  The Skribilo style for LNCS articles.
;;; -*- coding: iso-8859-1 -*-
;;;
;;; Copyright 2003, 2004  Manuel Serrano
;;; Copyright 2007  Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program 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 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program 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 this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.

(define-module (skribilo package lncs)
  :use-module (skribilo ast)
  :use-module (skribilo engine)
  :use-module (skribilo writer)
  :autoload   (skribilo output)         (output)
  :autoload   (skribilo package base)   (chapter font flush
                                         toc the-bibliography)
  :autoload   (skribilo utils keywords) (the-options the-body)
  :autoload   (skribilo biblio template)(output-bib-entry-template
                                         make-bib-entry-template/default)
  :autoload   (skribilo biblio author)  (bib-sort/first-author-last-name)
  :autoload   (skribilo evaluator)      (evaluate-document)

  :use-module (skribilo lib)
  :use-module (skribilo utils syntax)

  :use-module (ice-9 optargs)
  :use-module (srfi srfi-1)
  :use-module (srfi srfi-13)

  :export (abstract references))

(skribilo-module-syntax)

;;; Author: Manuel Serrano, Ludovic Court�s
;;;
;;; Commentary:
;;;
;;; This module provides support for writing articles for the ``Lecture Notes
;;; in Computer Science'' series (LNCS) published by Springer-Verlag.
;;;
;;; Since Springer provides a LaTeX class (called `llncs') and expects you to
;;; submit articles only in LaTeX, this module tries hard to use native LaTeX
;;; constructs when the LaTeX engine is being used, so that you can pass the
;;; generated TeX file to Springer-Verlag and make them happy.
;;;
;;; Code:


;*---------------------------------------------------------------------*/
;*    LaTeX global customizations                                      */
;*---------------------------------------------------------------------*/
(let ((le (find-engine 'latex)))
   (engine-custom-set! le 'documentclass "\\documentclass{llncs}")
   (engine-custom-set! le 'class-has-chapters? #f)
   ;; &latex-author
   (markup-writer '&latex-author le
      :action (lambda (n e)
		 (define (&latex-inst-body n)
		    (let ((affiliation (markup-option n :affiliation))
			  (address (markup-option n :address)))
		       (when affiliation (output affiliation e) (display ", "))
		       (when address
			  (for-each (lambda (a) (output a e) (display " "))
				    address)
			  (newline))))
		 (define (&latex-inst-n i)
		    (display "\\institute{\n")
		    (&latex-inst-body (car i))
		    (for-each (lambda (n)
				 (display "\\and\n")
				 (&latex-inst-body n))
			      (cdr i))
		    (display "}\n"))
		 (define (&latex-author-1 n)
		    (display "\\author{\n")
		    (output n e)
		    (display "}\n"))
		 (define (&latex-author-n n)
		    (display "\\author{\n")
		    (output (car n) e)
		    (for-each (lambda (a)
				 (display " and ")
				 (output a e))
			      (cdr n))
		    (display "}\n"))
		 (let ((body (markup-body n)))
                    (define (institute=? n1 n2)
                      (let ((aff1 (markup-option n1 :affiliation))
                            (add1 (markup-option n1 :address))
                            (aff2 (markup-option n2 :affiliation))
                            (add2 (markup-option n2 :address)))
                        (and (equal? aff1 aff2) (equal? add1 add2))))
                    (define (search-institute n i j)
                      (cond
                       ((null? i)
                        #f)
                       ((institute=? n (car i))
                        j)
                       (else
                        (search-institute n (cdr i) (- j 1)))))

		    (cond
		       ((is-markup? body 'author)
			(markup-option-add! n 'inst 1)
			(&latex-author-1 body)
			(&latex-inst-n (list body)))
		       ((and (list? body)
			     (every (lambda (b) (is-markup? b 'author))
                                    body))
			(if (null? (cdr body))
			    (begin
			       (markup-option-add! (car body) 'inst 1)
			       (&latex-author-1 (car body))
			       (&latex-inst-n body))
			    ;; collect the institutes
			    (let loop ((ns body)
				       (is '())
				       (j 1))
			       (if (null? ns)
				   (begin
				      (&latex-author-n body)
				      (&latex-inst-n (reverse! is)))
				   (let* ((n (car ns))
					  (si (search-institute n is (- j 1))))
				      (if (integer? si)
					  (begin
					     (markup-option-add! n 'inst si)
					     (loop (cdr ns) is j))
					  (begin
					     (markup-option-add! n 'inst j)
					     (loop (cdr ns)
						   (cons n is)
						   (+ 1 j)))))))))
		       (else
			(skribe-error 'author
				      "Illegal `lncs' author"
				      body))))))
   ;; author
   (let ((old-author (markup-writer-get 'author le)))
      (markup-writer 'author le
         :options (writer-options old-author)		     
         :action (lambda (n e)
		    (let ((name (markup-option n :name))
			  (title (markup-option n :title))
			  (inst (markup-option n 'inst)))
		       (if name (output name e))
		       (if title (output title e))
		       (if inst (format #t "\\inst{~a}\n" inst)))))))

;*---------------------------------------------------------------------*/
;*    HTML global customizations                                       */
;*---------------------------------------------------------------------*/
(let ((he (find-engine 'html)))
   (markup-writer '&html-lncs-abstract he
      :action (lambda (n e)
		 (let* ((bg (or (engine-custom e 'abstract-background)
				"#cccccc"))
			(exp (p (center (color :bg bg :width 90. 
					   (markup-body n))))))
		    (evaluate-document exp e)))))

;*---------------------------------------------------------------------*/
;*    abstract ...                                                     */
;*---------------------------------------------------------------------*/
(define-markup (abstract :rest opt :key postscript)
   (let ((w (markup-writer-get 'lncs-abstract (*current-engine*))))
     (if (writer? w)
         (new markup
            (markup 'lncs-abstract)
            (options (the-options opt))
            (loc  &invocation-location)
            (body (the-body opt)))
         (let ((a (new markup
                     (markup '&html-lncs-abstract)
                     (body (the-body opt)))))
           (list (if postscript
                     (chapter :number #f :toc #f :title "Postscript Download"
                              postscript))
                 (chapter :number #f :toc #f :title "Abstract" a)
                 (chapter :number #f :toc #f :title "Table of Contents"
                          (toc :subsection #t)))))))

;*---------------------------------------------------------------------*/
;*    references ...                                                   */
;*---------------------------------------------------------------------*/
(define* (references :key (sort #f))
   (let ((sort-proc (or sort bib-sort/first-author-last-name)))
     (list "\n\n"
           (if (engine-format? "latex")
               (font :size -1
                     (flush :side 'left
                            (the-bibliography :sort sort-proc)))
               (chapter :title "References"
                        (font :size -1
                              (the-bibliography :sort sort-proc)))))))


;;;
;;; Writers for LaTeX's `llncs' document class.
;;;

(when-engine-is-loaded 'latex
  (lambda ()
    (let ((latex (find-engine 'latex)))

      ;; Use the `abstract' command provided by the `llncs' class.
      (markup-writer 'lncs-abstract latex
         :before "\n\\begin{abstract}\n"
         :after  "\n\\end{abstract}\n")


      ;; Use the native bibliography system (BibTeX).

      (markup-writer 'bib-ref latex
         :options '(:text :bib)
         :action (lambda (n e)
                   (let ((entry (handle-ast (markup-body n))))
                     (format #t "\\cite{~a}" (markup-ident entry)))))

      (markup-writer 'bib-ref+ latex
         :options '(:text :bib :sort-bib-refs)
         :action (lambda (n e)
                   (let ((entries   (map (lambda (bib-ref)
                                           (handle-ast (markup-body bib-ref)))
                                         (markup-body n)))
                         (sort-proc (markup-option n :sort-bib-refs)))
                     (format #t "\\cite{~a}"
                             (string-join (map markup-ident
                                               (if (procedure? sort-proc)
                                                   (sort entries sort-proc)
                                                   entries))
                                          ",")))))

      (markup-writer '&the-bibliography latex
         :before (lambda (n e)
                   (let ((count (length (markup-body n))))
                     (format #t "\\begin{thebibliography}{~a}\n"
                             count)))
         :after  "\\end{thebibliography}\n")

      (markup-writer '&bib-entry-body
         :action (lambda (n e)
                   (let* ((kind (markup-option n 'kind))
                          (template (make-bib-entry-template/default kind)))
                     (output-bib-entry-template n e template))))

      (markup-writer '&bib-entry latex
         :action (lambda (n e)
                   (display "%\n\\bibitem[")
                   (output (markup-option n :title) e)
                   (format #t "]{~a}\n" (markup-ident n))
                   (output n e (markup-writer-get '&bib-entry-body e)))
         :after "\n%\n"))))


;;; lncs.scm ends here