`slide' and `eq': moved engine-specific code in separate modules.

* src/guile/skribilo/package/slide.scm: Moved engine-specific code to
  `slide/ENGINE.scm'.

* src/guile/skribilo/package/eq.scm: Likewise.

* configure.ac: Produce the new Makefiles.

* src/guile/skribilo/engine/lout.scm: Export more stuff.
  Moved the slide-related things out of here.

* src/guile/skribilo/utils/compat.scm (skribe-load): Removed `call/cc'
  (not needed).

git-archimport-id: lcourtes@laas.fr--2004-libre/skribilo--devel--1.2--patch-51

12 files changed, 897 insertions, 717 deletions

diff --git a/configure.ac b/configure.ac
index 17f914d..90ae155 100644
--- a/configure.ac
+++ b/configure.ac
@@ -35,6 +35,8 @@ AC_OUTPUT([Makefile
 	   src/guile/skribilo/engine/Makefile
 	   src/guile/skribilo/reader/Makefile
 	   src/guile/skribilo/package/Makefile
+	   src/guile/skribilo/package/slide/Makefile
+	   src/guile/skribilo/package/eq/Makefile
 	   src/guile/skribilo/skribe/Makefile
 	   src/guile/skribilo/coloring/Makefile
 	   doc/Makefile
diff --git a/src/guile/skribilo/engine/lout.scm b/src/guile/skribilo/engine/lout.scm
index de6fb3e..17eb237 100644
--- a/src/guile/skribilo/engine/lout.scm
+++ b/src/guile/skribilo/engine/lout.scm
@@ -28,10 +28,11 @@
   :autoload (ice-9 rdelim)  (read-line))
 
 
+
 ;*---------------------------------------------------------------------*/
 ;*    lout-verbatim-encoding ...                                       */
 ;*---------------------------------------------------------------------*/
-(define lout-verbatim-encoding
+(define-public lout-verbatim-encoding
    '((#\/ "\"/\"")
      (#\\ "\"\\\\\"")
      (#\| "\"|\"")
@@ -48,7 +49,7 @@
 ;*---------------------------------------------------------------------*/
 ;*    lout-encoding ...                                                */
 ;*---------------------------------------------------------------------*/
-(define lout-encoding
+(define-public lout-encoding
   `(,@lout-verbatim-encoding
     (#\ç "{ @Char ccedilla }")
     (#\Ç "{ @Char Ccdeilla }")
@@ -349,7 +350,7 @@
 		     (current-error-port))))
        #t))
 
-(define (lout-tagify ident)
+(define-public (lout-tagify ident)
   ;; Return an "clean" identifier (a string) based on `ident' (a string),
   ;; suitable for Lout as an `@Tag' value.
   (let ((tag-encoding '((#\, "-")
@@ -776,7 +777,7 @@
 					     `(,node ,engine ,@children)))))
 		nodes))))
 
-(define (lout-embedded-postscript-code postscript)
+(define-public (lout-embedded-postscript-code postscript)
   ;; Return a string embedding PostScript code `postscript' into Lout code.
   (string-append "\n"
 		 "{ @BackEnd @Case {\n"
@@ -785,7 +786,7 @@
 		 "        }\n"
 		 "} } @Graphic { }\n"))
 
-(define (lout-pdf-docinfo doc engine)
+(define-public (lout-pdf-docinfo doc engine)
   ;; Produce PostScript code that will produce PDF document information once
   ;; converted to PDF.
   (let* ((filter-string (make-string-replace `(,@lout-verbatim-encoding
@@ -845,7 +846,7 @@
 				   extra-fields)))
 		   "\"/\"DOCINFO pdfmark\n")))
 
-(define (lout-output-pdf-meta-info doc engine)
+(define-public (lout-output-pdf-meta-info doc engine)
   ;; Produce PDF bookmarks (aka. "outline") for document `doc', as well as
   ;; document meta-information (or "docinfo").  This function makes sure that
   ;; both are only produced once, and only if the relevant customs ask for
@@ -2872,98 +2873,6 @@
 	    (image :file output alt))))))
 
 
-
-;*---------------------------------------------------------------------*/
-;*    Slides                                                           */
-;*                                                                     */
-;* At some point, we might want to move this to `slide.scm'.           */
-;*---------------------------------------------------------------------*/
-
-(use-modules (skribilo package slide))
-
-(markup-writer 'slide
-   :options '(:title :number :toc :ident) ;; '(:bg :vspace :image)
-
-   :validate (lambda (n e)
-		(eq? (engine-custom e 'document-type) 'slides))
-
-   :before (lambda (n e)
-	      (display "\n@Overhead\n")
-	      (display "  @Title { ")
-	      (output (markup-option n :title) e)
-	      (display " }\n")
-	      (if (markup-ident n)
-		  (begin
-		     (display "  @Tag { ")
-		     (display (lout-tagify (markup-ident n)))
-		     (display " }\n")))
-	      (if (markup-option n :number)
-		  (begin
-		     (display "  @BypassNumber { ")
-		     (output (markup-option n :number) e)
-		     (display " }\n")))
-	      (display "@Begin\n")
-
-	      ;; `doc' documents produce their PDF outline right after
-	      ;; `@Text @Begin'; other types of documents must produce it
-	      ;; as part of their first chapter.
-	      (lout-output-pdf-meta-info (ast-document n) e))
-
-   :after "@End @Overhead\n")
-
-(markup-writer 'slide-vspace
-   :options '(:unit)
-   :validate (lambda (n e)
-		(and (pair? (markup-body n))
-		     (number? (car (markup-body n)))))
-   :action (lambda (n e)
-	      (printf "\n//~a~a # slide-vspace\n"
-		      (car (markup-body n))
-		      (case (markup-option n :unit)
-			 ((cm)              "c")
-			 ((point points pt) "p")
-			 ((inch inches)     "i")
-			 (else
-			  (skribe-error 'lout
-					"Unknown vspace unit"
-					(markup-option n :unit)))))))
-
-(markup-writer 'slide-pause
-   ;; FIXME:  Use a `pdfmark' custom action and a PDF transition action.
-   ;; << /Type /Action
-   ;; << /S /Trans
-   ;; entry in the trans dict
-   ;; << /Type /Trans  /S /Dissolve >>
-   :action (lambda (n e)
-	     (let ((filter (make-string-replace lout-verbatim-encoding))
-		   (pdfmark "
-[ {ThisPage} << /Trans << /S /Wipe /Dm /V /D 3 /M /O >> >> /PUT pdfmark"))
-               (display (lout-embedded-postscript-code
-                         (filter pdfmark))))))
-
-;; For movies, see
-;; http://www.tug.org/tex-archive/macros/latex/contrib/movie15/movie15.sty .
-(markup-writer 'slide-embed
-   :options '(:alt :geometry :rgeometry :geometry-opt :command)
-   ;; FIXME:  `pdfmark'.
-   ;; << /Type /Action   /S /Launch
-   :action (lambda (n e)
-	     (let ((command (markup-option n :command))
-		   (filter (make-string-replace lout-verbatim-encoding))
-		   (pdfmark "[ /Rect [ 0 ysize xsize 0 ]
-  /Name /Comment
-  /Contents (This is an embedded application)
-  /ANN pdfmark
-
-[ /Type /Action
-  /S    /Launch
-  /F    (~a)
-  /OBJ pdfmark"))
-	     (display (string-append
-		       "4c @Wide 3c @High "
-		       (lout-embedded-postscript-code
-			(filter (format #f pdfmark command))))))))
-
 ;*---------------------------------------------------------------------*/
 ;*    Restore the base engine                                          */
 ;*---------------------------------------------------------------------*/
diff --git a/src/guile/skribilo/package/Makefile.am b/src/guile/skribilo/package/Makefile.am
index 781b1aa..6cb30b9 100644
--- a/src/guile/skribilo/package/Makefile.am
+++ b/src/guile/skribilo/package/Makefile.am
@@ -4,3 +4,4 @@ dist_guilemodule_DATA = acmproc.scm french.scm jfp.scm letter.scm	\
 			slide.scm web-article.scm web-book.scm		\
 			eq.scm
 
+SUBDIRS = slide eq
diff --git a/src/guile/skribilo/package/eq.scm b/src/guile/skribilo/package/eq.scm
index 9be8f61..410f04f 100644
--- a/src/guile/skribilo/package/eq.scm
+++ b/src/guile/skribilo/package/eq.scm
@@ -44,6 +44,7 @@
 
 (fluid-set! current-reader %skribilo-module-reader)
 
+
 
 ;;;
 ;;; Utilities.
@@ -140,147 +141,6 @@
 
 
 ;;;
-;;; Lout implementation
-;;;
-
-(let ((lout (find-engine 'lout)))
-  (if (not lout)
-      (skribe-error 'eq "Lout engine not found" lout)
-      (let ((includes (engine-custom lout 'includes)))
-	;; Append the `eq' include file
-	(engine-custom-set! lout 'includes
-			    (string-append includes "\n"
-					   "@SysInclude { eq }\n")))))
-
-;; FIXME:  Reimplement the `symbol' writer so that `@Sym' is not used within
-;; equations (e.g. output `alpha' instead of `{ @Sym alpha }').
-
-(markup-writer 'eq (find-engine 'lout)
-   :before "\n@Eq { "
-   :action (lambda (node engine)
-	      (let ((eq (markup-body node)))
-		 ;(fprint (current-error-port) "eq=" eq)
-		 (output eq engine)))
-   :after  " }\n")
-
-
-;;
-;; `+' and `-' have lower precedence than `*', `/', `=', etc., so their
-;; operands do not need to be enclosed in braces.
-;;
-
-(markup-writer 'eq:+ (find-engine 'lout)
-   :action (lambda (node engine)
-	      (let loop ((operands (markup-body node)))
-		 (if (null? operands)
-		     #t
-		     (begin
-		       ;; no braces
-		       (output (car operands) engine)
-		       (if (pair? (cdr operands))
-			   (display " + "))
-		       (loop (cdr operands)))))))
-
-(markup-writer 'eq:- (find-engine 'lout)
-   :action (lambda (node engine)
-	      (let loop ((operands (markup-body node)))
-		 (if (null? operands)
-		     #t
-		     (begin
-		       ;; no braces
-		       (output (car operands) engine)
-		       (if (pair? (cdr operands))
-			   (display " - "))
-		       (loop (cdr operands)))))))
-
-(define-macro (simple-lout-markup-writer sym . lout-name)
-  `(markup-writer ',(symbol-append 'eq: sym)
-		  (find-engine 'lout)
-      :action (lambda (node engine)
-		(let loop ((operands (markup-body node)))
-		  (if (null? operands)
-		      #t
-		      (begin
-			(display " { ")
-			(output (car operands) engine)
-			(display " }")
-			(if (pair? (cdr operands))
-			    (display ,(string-append " "
-						     (if (null? lout-name)
-							 (symbol->string sym)
-							 (car lout-name))
-						     " ")))
-			(loop (cdr operands))))))))
-
-(simple-lout-markup-writer * "times")
-(simple-lout-markup-writer / "over")
-(simple-lout-markup-writer =)
-(simple-lout-markup-writer <)
-(simple-lout-markup-writer >)
-(simple-lout-markup-writer <=)
-(simple-lout-markup-writer >=)
-
-(markup-writer 'eq:expt (find-engine 'lout)
-   :action (lambda (node engine)
-	     (let ((body (markup-body node)))
-	       (if (= (length body) 2)
-		   (let ((base (car body))
-			 (expt (cadr body)))
-		     (display " { { ")
-		     (if (markup? base) (display "("))
-		     (output base engine)
-		     (if (markup? base) (display ")"))
-		     (display " } sup { ")
-		     (output expt engine)
-		     (display " } } "))
-		   (skribe-error 'eq:expt "wrong number of arguments"
-				 body)))))
-
-
-;;;
-;;; Sums, products, integrals, etc.
-;;;
-
-(define-macro (range-lout-markup-writer sym lout-name)
-  `(markup-writer ',(symbol-append 'eq: sym) (find-engine 'lout)
-      :action (lambda (node engine)
-		(let ((from (markup-option node :from))
-		      (to (markup-option node :to))
-		      (body (markup-body node)))
-		  (display ,(string-append " { big " lout-name
-					   " from { "))
-		  (output from engine)
-		  (display " } to { ")
-		  (output to engine)
-		  (display " } { ")
-		  (output body engine)
-		  (display " } } ")))))
-
-(range-lout-markup-writer sum "sum")
-(range-lout-markup-writer product "prod")
-
-(markup-writer 'eq:script (find-engine 'lout)
-   :action (lambda (node engine)
-	     (let ((body (markup-body node))
-		   (sup (markup-option node :sup))
-		   (sub (markup-option node :sub)))
-	       (display " { { ")
-	       (output body engine)
-	       (display " } ")
-	       (if sup
-		   (begin
-		     (display (if sub " supp { " " sup { "))
-		     (output sup engine)
-		     (display " } ")))
-	       (if sub
-		   (begin
-		     (display " on { ")
-		     (output sub engine)
-		     (display " } ")))
-	       (display " } "))))
-
-
-;;;
 ;;; Text-only implementation.
 ;;;
 
@@ -301,6 +161,16 @@
 			 (display " / "))
 		     (loop (cdr operands)))))))
 
+
+;;;
+;;; Initialization.
+;;;
+
+(when-engine-is-loaded 'lout
+  (lambda ()
+    (resolve-module '(skribilo package eq lout))))
+
+
 ;;; arch-tag: 58764650-2684-47a6-8cc7-6288f2b474da
 
 ;;; eq.scm ends here
diff --git a/src/guile/skribilo/package/eq/Makefile.am b/src/guile/skribilo/package/eq/Makefile.am
new file mode 100644
index 0000000..c7b4f93
--- /dev/null
+++ b/src/guile/skribilo/package/eq/Makefile.am
@@ -0,0 +1,4 @@
+guilemoduledir = $(GUILE_SITE)/skribilo/package/eq
+dist_guilemodule_DATA = lout.scm
+
+## arch-tag: 3e816c9a-7989-4baa-b38b-a095a5428ba1
diff --git a/src/guile/skribilo/package/eq/lout.scm b/src/guile/skribilo/package/eq/lout.scm
new file mode 100644
index 0000000..30a6d39
--- /dev/null
+++ b/src/guile/skribilo/package/eq/lout.scm
@@ -0,0 +1,184 @@
+;;; lout.scm  --  Lout implementation of the `eq' package.
+;;;
+;;; Copyright 2005, 2006  Ludovic Courtès <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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
+(define-module (skribilo package eq lout)
+  :use-module (skribilo package eq)
+  :use-module (skribilo ast)
+  :autoload   (skribilo output) (output)
+  :use-module (skribilo writer)
+  :use-module (skribilo engine)
+  :use-module (skribilo lib)
+  :use-module (skribilo utils syntax)
+  :use-module (skribilo skribe utils) ;; `the-options', etc.
+  :use-module (ice-9 optargs))
+
+(fluid-set! current-reader %skribilo-module-reader)
+
+
+
+;;;
+;;; Initialization.
+;;;
+
+(let ((lout (find-engine 'lout)))
+  (if (not lout)
+      (skribe-error 'eq "Lout engine not found" lout)
+      (let ((includes (engine-custom lout 'includes)))
+	;; Append the `eq' include file
+	(engine-custom-set! lout 'includes
+			    (string-append includes "\n"
+					   "@SysInclude { eq }\n")))))
+
+
+;;;
+;;; Simple markup writers.
+;;;
+
+
+;; FIXME:  Reimplement the `symbol' writer so that `@Sym' is not used within
+;; equations (e.g. output `alpha' instead of `{ @Sym alpha }').
+
+(markup-writer 'eq (find-engine 'lout)
+   :before "\n@Eq { "
+   :action (lambda (node engine)
+	      (let ((eq (markup-body node)))
+		 ;(fprint (current-error-port) "eq=" eq)
+		 (output eq engine)))
+   :after  " }\n")
+
+
+;;
+;; `+' and `-' have lower precedence than `*', `/', `=', etc., so their
+;; operands do not need to be enclosed in braces.
+;;
+
+(markup-writer 'eq:+ (find-engine 'lout)
+   :action (lambda (node engine)
+	      (let loop ((operands (markup-body node)))
+		 (if (null? operands)
+		     #t
+		     (begin
+		       ;; no braces
+		       (output (car operands) engine)
+		       (if (pair? (cdr operands))
+			   (display " + "))
+		       (loop (cdr operands)))))))
+
+(markup-writer 'eq:- (find-engine 'lout)
+   :action (lambda (node engine)
+	      (let loop ((operands (markup-body node)))
+		 (if (null? operands)
+		     #t
+		     (begin
+		       ;; no braces
+		       (output (car operands) engine)
+		       (if (pair? (cdr operands))
+			   (display " - "))
+		       (loop (cdr operands)))))))
+
+(define-macro (simple-lout-markup-writer sym . lout-name)
+  `(markup-writer ',(symbol-append 'eq: sym)
+		  (find-engine 'lout)
+      :action (lambda (node engine)
+		(let loop ((operands (markup-body node)))
+		  (if (null? operands)
+		      #t
+		      (begin
+			(display " { ")
+			(output (car operands) engine)
+			(display " }")
+			(if (pair? (cdr operands))
+			    (display ,(string-append " "
+						     (if (null? lout-name)
+							 (symbol->string sym)
+							 (car lout-name))
+						     " ")))
+			(loop (cdr operands))))))))
+
+(simple-lout-markup-writer * "times")
+(simple-lout-markup-writer / "over")
+(simple-lout-markup-writer =)
+(simple-lout-markup-writer <)
+(simple-lout-markup-writer >)
+(simple-lout-markup-writer <=)
+(simple-lout-markup-writer >=)
+
+(markup-writer 'eq:expt (find-engine 'lout)
+   :action (lambda (node engine)
+	     (let ((body (markup-body node)))
+	       (if (= (length body) 2)
+		   (let ((base (car body))
+			 (expt (cadr body)))
+		     (display " { { ")
+		     (if (markup? base) (display "("))
+		     (output base engine)
+		     (if (markup? base) (display ")"))
+		     (display " } sup { ")
+		     (output expt engine)
+		     (display " } } "))
+		   (skribe-error 'eq:expt "wrong number of arguments"
+				 body)))))
+
+
+
+;;;
+;;; Sums, products, integrals, etc.
+;;;
+
+(define-macro (range-lout-markup-writer sym lout-name)
+  `(markup-writer ',(symbol-append 'eq: sym) (find-engine 'lout)
+      :action (lambda (node engine)
+		(let ((from (markup-option node :from))
+		      (to (markup-option node :to))
+		      (body (markup-body node)))
+		  (display ,(string-append " { big " lout-name
+					   " from { "))
+		  (output from engine)
+		  (display " } to { ")
+		  (output to engine)
+		  (display " } { ")
+		  (output body engine)
+		  (display " } } ")))))
+
+(range-lout-markup-writer sum "sum")
+(range-lout-markup-writer product "prod")
+
+(markup-writer 'eq:script (find-engine 'lout)
+   :action (lambda (node engine)
+	     (let ((body (markup-body node))
+		   (sup (markup-option node :sup))
+		   (sub (markup-option node :sub)))
+	       (display " { { ")
+	       (output body engine)
+	       (display " } ")
+	       (if sup
+		   (begin
+		     (display (if sub " supp { " " sup { "))
+		     (output sup engine)
+		     (display " } ")))
+	       (if sub
+		   (begin
+		     (display " on { ")
+		     (output sub engine)
+		     (display " } ")))
+	       (display " } "))))
+
+
+;;; arch-tag: 2a1410e5-977e-4600-b781-3d57f4409b35
diff --git a/src/guile/skribilo/package/slide.scm b/src/guile/skribilo/package/slide.scm
index 5b39239..8968d00 100644
--- a/src/guile/skribilo/package/slide.scm
+++ b/src/guile/skribilo/package/slide.scm
@@ -1,82 +1,60 @@
-;*=====================================================================*/
-;*    serrano/prgm/project/skribe/skr/slide.skr                        */
-;*    -------------------------------------------------------------    */
-;*    Author      :  Manuel Serrano                                    */
-;*    Creation    :  Fri Oct  3 12:22:13 2003                          */
-;*    Last change :  Mon Aug 23 09:08:21 2004 (serrano)                */
-;*    Copyright   :  2003-04 Manuel Serrano                            */
-;*    -------------------------------------------------------------    */
-;*    Skribe style for slides                                          */
-;*=====================================================================*/
+;;; slide.scm  --  Overhead transparencies.
+;;;
+;;; Copyright 2003, 2004  Manuel Serrano
+;;; Copyright 2006  Ludovic Courtès <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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
 
 (define-skribe-module (skribilo package slide)
-  :autoload (skribilo engine html) (html-width html-title-authors))
+  :autoload (skribilo engine html) (html-width html-title-authors)
+  :autoload (skribilo package slide html) (%slide-html-initialize!)
+  :autoload (skribilo package slide lout) (%slide-lout-initialize!)
+  :autoload (skribilo package slide latex) (%slide-latex-initialize!))
 
 
 ;*---------------------------------------------------------------------*/
 ;*    slide-options                                                    */
 ;*---------------------------------------------------------------------*/
-(define &slide-load-options (skribe-load-options))
-
-;*---------------------------------------------------------------------*/
-;*    &slide-seminar-predocument ...                                   */
-;*---------------------------------------------------------------------*/
-(define &slide-seminar-predocument
-   "\\special{landscape}
-   \\slideframe{none}
-   \\centerslidesfalse
-   \\raggedslides[0pt]
-   \\renewcommand{\\slideleftmargin}{0.2in}
-   \\renewcommand{\\slidetopmargin}{0.3in}
-   \\newdimen\\slidewidth \\slidewidth 9in")
-
-;*---------------------------------------------------------------------*/
-;*    &slide-seminar-maketitle ...                                     */
-;*---------------------------------------------------------------------*/
-(define &slide-seminar-maketitle
-   "\\def\\labelitemi{$\\bullet$}
-   \\def\\labelitemii{$\\circ$}
-   \\def\\labelitemiii{$\\diamond$}
-   \\def\\labelitemiv{$\\cdot$}
-   \\pagestyle{empty}
-   \\slideframe{none}
-   \\centerslidestrue
-   \\begin{slide}
-   \\date{}
-   \\maketitle
-   \\end{slide}
-   \\slideframe{none}
-   \\centerslidesfalse")
+(define-public &slide-load-options (skribe-load-options))
 
-;*---------------------------------------------------------------------*/
-;*    &slide-prosper-predocument ...                                   */
-;*---------------------------------------------------------------------*/
-(define &slide-prosper-predocument
-   "\\slideCaption{}\n")
 
 ;*---------------------------------------------------------------------*/
 ;*    %slide-the-slides ...                                            */
 ;*---------------------------------------------------------------------*/
 (define %slide-the-slides '())
 (define %slide-the-counter 0)
-(define %slide-initialized #f)
-(define %slide-latex-mode 'seminar)
 
 ;*---------------------------------------------------------------------*/
 ;*    %slide-initialize! ...                                           */
 ;*---------------------------------------------------------------------*/
-(define (%slide-initialize!)
-   (unless %slide-initialized
-      (set! %slide-initialized #t)
-      (case %slide-latex-mode
-	 ((seminar)
-	  (%slide-seminar-setup!))
-	 ((advi)
-	  (%slide-advi-setup!))
-	 ((prosper)
-	  (%slide-prosper-setup!))
-	 (else
-	  (skribe-error 'slide "Illegal latex mode" %slide-latex-mode)))))
+(format (current-error-port) "Slides initializing...~%")
+
+;; Register specific implementations for lazy loading.
+(when-engine-is-loaded 'latex
+  (lambda ()
+    (%slide-latex-initialize!)))
+(when-engine-is-loaded 'html
+  (lambda ()
+    (%slide-html-initialize!)))
+(when-engine-is-loaded 'lout
+  (lambda ()
+    (%slide-lout-initialize!)))
+
 
 ;*---------------------------------------------------------------------*/
 ;*    slide ...                                                        */
@@ -89,7 +67,6 @@
 		      (vspace #f) (vfill #f)
 		      (transition #f)
 		      (bg #f) (image #f))
-   (%slide-initialize!)
    (let ((s (new container
 	       (markup 'slide)
 	       (ident (if (not ident)
@@ -288,403 +265,12 @@
       :action (lambda (n e)
 		 (output (markup-option n :alt) e))))
 
-;*---------------------------------------------------------------------*/
-;*    slide-body-width ...                                             */
-;*---------------------------------------------------------------------*/
-(define (slide-body-width e)
-   (let ((w (engine-custom e 'body-width)))
-      (if (or (number? w) (string? w)) w 95.)))
-
-;*---------------------------------------------------------------------*/
-;*    html-slide-title ...                                             */
-;*---------------------------------------------------------------------*/
-(define (html-slide-title n e)
-   (let* ((title (markup-body n))
-	  (authors (markup-option n 'author))
-	  (tbg (engine-custom e 'title-background))
-	  (tfg (engine-custom e 'title-foreground))
-	  (tfont (engine-custom e 'title-font)))
-      (printf "<center><table cellspacing='0' cellpadding='0' width=\"~a\" class=\"skribetitle\"><tbody>\n<tr>"
-	      (html-width (slide-body-width e)))
-      (if (string? tbg)
-	  (printf "<td bgcolor=\"~a\">" tbg)
-	  (display "<td>"))
-      (if (string? tfg)
-	  (printf "<font color=\"~a\">" tfg))
-      (if title
-	  (begin
-	     (display "<center>")
-	     (if (string? tfont)
-		 (begin
-		    (printf "<font ~a><strong>" tfont)
-		    (output title e)
-		    (display "</strong></font>"))
-		 (begin
-		    (printf "<div class=\"skribetitle\"><strong><big><big><big>")
-		    (output title e)
-		    (display "</big></big></big></strong</div>")))
-	     (display "</center>\n")))
-      (if (not authors)
-	  (display "\n")
-	  (html-title-authors authors e))
-      (if (string? tfg)
-	  (display "</font>"))
-      (display "</td></tr></tbody></table></center>\n")))
 
 ;*---------------------------------------------------------------------*/
 ;*    slide-number ...                                                 */
 ;*---------------------------------------------------------------------*/
-(define (slide-number)
+(define-public (slide-number)
    (length (filter (lambda (n)
 		      (and (is-markup? n 'slide)
 			   (markup-option n :number)))
 		   %slide-the-slides)))
-
-;*---------------------------------------------------------------------*/
-;*    html                                                             */
-;*---------------------------------------------------------------------*/
-(let ((he (find-engine 'html)))
-   (skribe-message "HTML slides setup...\n")
-   ;; &html-page-title
-   (markup-writer '&html-document-title he
-      :predicate (lambda (n e) %slide-initialized)
-      :action html-slide-title)
-   ;; slide
-   (markup-writer 'slide he
-      :options '(:title :number :transition :toc :bg)
-      :before (lambda (n e)
-		 (printf "<a name=\"~a\">" (markup-ident n))
-		 (display "<br>\n"))
-      :action (lambda (n e)
-		 (let ((nb (markup-option n :number))
-		       (t (markup-option n :title)))
-		    (skribe-eval
-		     (center
-			(color :width (slide-body-width e)
-			   :bg (or (markup-option n :bg) "#ffffff")
-			   (table :width 100.
-			      (tr (th :align 'left
-				     (list
-				      (if nb
-					  (format #f "~a / ~a -- " nb
-						  (slide-number)))
-				      t)))
-			      (tr (td (hrule)))
-			      (tr (td :width 100. :align 'left
-				     (markup-body n))))
-			   (linebreak)))
-		     e)))
-      :after "<br>")
-   ;; slide-vspace
-   (markup-writer 'slide-vspace he
-      :action (lambda (n e) (display "<br>"))))
-
-;*---------------------------------------------------------------------*/
-;*    latex                                                            */
-;*---------------------------------------------------------------------*/
-(define &latex-slide #f)
-(define &latex-pause #f)
-(define &latex-embed #f)
-(define &latex-record #f)
-(define &latex-play #f)
-(define &latex-play* #f)
-
-;;; FIXME: We shouldn't load `latex.scm' from here.  Instead, we should
-;;; register a hook on its load.
-(let ((le (find-engine 'latex)))
-   ;; slide-vspace
-   (markup-writer 'slide-vspace le
-      :options '(:unit)
-      :action (lambda (n e)
-		 (display "\n\\vspace{")
-		 (output (markup-body n) e)
-		 (printf " ~a}\n\n" (markup-option n :unit))))
-   ;; slide-slide
-   (markup-writer 'slide le
-      :options '(:title :number :transition :vfill :toc :vspace :image)
-      :action (lambda (n e)
-		 (if (procedure? &latex-slide)
-		     (&latex-slide n e))))
-   ;; slide-pause
-   (markup-writer 'slide-pause le
-      :options '()
-      :action (lambda (n e)
-		 (if (procedure? &latex-pause)
-		     (&latex-pause n e))))
-   ;; slide-embed
-   (markup-writer 'slide-embed le
-      :options '(:alt :command :geometry-opt :geometry
-		      :rgeometry :transient :transient-opt)
-      :action (lambda (n e)
-		 (if (procedure? &latex-embed)
-		     (&latex-embed n e))))
-   ;; slide-record
-   (markup-writer 'slide-record le
-      :options '(:tag :play)
-      :action (lambda (n e)
-		 (if (procedure? &latex-record)
-		     (&latex-record n e))))
-   ;; slide-play
-   (markup-writer 'slide-play le
-      :options '(:tag :color)
-      :action (lambda (n e)
-		 (if (procedure? &latex-play)
-		     (&latex-play n e))))
-   ;; slide-play*
-   (markup-writer 'slide-play* le
-      :options '(:tag :color :scolor)
-      :action (lambda (n e)
-		 (if (procedure? &latex-play*)
-		     (&latex-play* n e)))))
-
-;*---------------------------------------------------------------------*/
-;*    %slide-seminar-setup! ...                                        */
-;*---------------------------------------------------------------------*/
-(define (%slide-seminar-setup!)
-   (skribe-message "Seminar slides setup...\n")
-   (let ((le (find-engine 'latex))
-	 (be (find-engine 'base)))
-      ;; latex configuration
-      (define (seminar-slide n e)
-	 (let ((nb (markup-option n :number))
-	       (t (markup-option n :title)))
-	    (display "\\begin{slide}\n")
-	    (if nb (printf "~a/~a -- " nb (slide-number)))
-	    (output t e)
-	    (display "\\hrule\n"))
-	 (output (markup-body n) e)
-	 (if (markup-option n :vill) (display "\\vfill\n"))
-	 (display "\\end{slide}\n"))
-      (engine-custom-set! le 'documentclass
-	 "\\documentclass[landscape]{seminar}\n")
-      (let ((o (engine-custom le 'predocument)))
-	 (engine-custom-set! le 'predocument
-	    (if (string? o)
-		(string-append &slide-seminar-predocument o)
-		&slide-seminar-predocument)))
-      (engine-custom-set! le 'maketitle
-	 &slide-seminar-maketitle)
-      (engine-custom-set! le 'hyperref-usepackage
-	 "\\usepackage[setpagesize=false]{hyperref}\n")
-      ;; slide-slide
-      (set! &latex-slide seminar-slide)))
-
-;*---------------------------------------------------------------------*/
-;*    %slide-advi-setup! ...                                           */
-;*---------------------------------------------------------------------*/
-(define (%slide-advi-setup!)
-   (skribe-message "Generating `Advi Seminar' slides...\n")
-   (let ((le (find-engine 'latex))
-	 (be (find-engine 'base)))
-      (define (advi-geometry geo)
-	 (let ((r (pregexp-match "([0-9]+)x([0-9]+)" geo)))
-	    (if (pair? r)
-		(let* ((w (cadr r))
-		       (w' (string->integer w))
-		       (w'' (number->string (/ w' *skribe-slide-advi-scale*)))
-		       (h (caddr r))
-		       (h' (string->integer h))
-		       (h'' (number->string (/ h' *skribe-slide-advi-scale*))))
-		   (values "" (string-append w "x" h "+!x+!y")))
-		(let ((r (pregexp-match "([0-9]+)x([0-9]+)[+](-?[0-9]+)[+](-?[0-9]+)" geo)))
-		   (if (pair? r)
-		       (let ((w (number->string (/ (string->integer (cadr r))
-						   *skribe-slide-advi-scale*)))
-			     (h (number->string (/ (string->integer (caddr r))
-						   *skribe-slide-advi-scale*)))
-			     (x (cadddr r))
-			     (y (car (cddddr r))))
-			  (values (string-append "width=" w "cm,height=" h "cm")
-				  "!g"))
-		       (values "" geo))))))
-      (define (advi-transition trans)
-	 (cond
-	    ((string? trans)
-	     (printf "\\advitransition{~s}" trans))
-	    ((and (symbol? trans)
-		  (memq trans '(wipe block slide)))
-	     (printf "\\advitransition{~s}" trans))
-	    (else
-	     #f)))
-      ;; latex configuration
-      (define (advi-slide n e)
-	 (let ((i (markup-option n :image))
-	       (n (markup-option n :number))
-	       (t (markup-option n :title))
-	       (lt (markup-option n :transition))
-	       (gt (engine-custom e 'transition)))
-	    (if (and i (engine-custom e 'advi))
-		(printf "\\advibg[global]{image=~a}\n"
-			(if (and (pair? i)
-				 (null? (cdr i))
-				 (string? (car i)))
-			    (car i)
-			    i)))
-	    (display "\\begin{slide}\n")
-	    (advi-transition (or lt gt))
-	    (if n (printf "~a/~a -- " n (slide-number)))
-	    (output t e)
-	    (display "\\hrule\n"))
-	 (output (markup-body n) e)
-	 (if (markup-option n :vill) (display "\\vfill\n"))
-	 (display "\\end{slide}\n\n\n"))
-      ;; advi record
-      (define (advi-record n e)
-	 (display "\\advirecord")
-	 (when (markup-option n :play) (display "[play]"))
-	 (printf "{~a}{" (markup-option n :tag))
-	 (output (markup-body n) e)
-	 (display "}"))
-      ;; advi play
-      (define (advi-play n e)
-	 (display "\\adviplay")
-	 (let ((c (markup-option n :color)))
-	    (when c
-	       (display "[")
-	       (display (skribe-get-latex-color c))
-	       (display "]")))
-	 (printf "{~a}" (markup-option n :tag)))
-      ;; advi play*
-      (define (advi-play* n e)
-	 (let ((c (skribe-get-latex-color (markup-option n :color)))
-	       (d (skribe-get-latex-color (markup-option n :scolor))))
-	    (let loop ((lbls (markup-body n))
-		       (last #f))
-	       (when last
-		  (display "\\adviplay[")
-		  (display d)
-		  (printf "]{~a}" last))
-	       (when (pair? lbls)
-		  (let ((lbl (car lbls)))
-		     (match-case lbl
-			((?id ?col)
-			 (display "\\adviplay[")
-			 (display (skribe-get-latex-color col))
-			 (printf "]{" ~a "}" id)
-			 (skribe-eval (slide-pause) e)
-			 (loop (cdr lbls) id))
-			(else
-			 (display "\\adviplay[")
-			 (display c)
-			 (printf "]{~a}" lbl)
-			 (skribe-eval (slide-pause) e)
-			 (loop (cdr lbls) lbl))))))))
-      (engine-custom-set! le 'documentclass
-	 "\\documentclass{seminar}\n")
-      (let ((o (engine-custom le 'predocument)))
-	 (engine-custom-set! le 'predocument
-	    (if (string? o)
-		(string-append &slide-seminar-predocument o)
-		&slide-seminar-predocument)))
-      (engine-custom-set! le 'maketitle
-	 &slide-seminar-maketitle)
-      (engine-custom-set! le 'usepackage
-	 (string-append "\\usepackage{advi}\n"
-			(engine-custom le 'usepackage)))
-      ;; slide
-      (set! &latex-slide advi-slide)
-      (set! &latex-pause
-	    (lambda (n e) (display "\\adviwait\n")))
-      (set! &latex-embed
-	    (lambda (n e)
-	       (let ((geometry-opt (markup-option n :geometry-opt))
-		     (geometry (markup-option n :geometry))
-		     (rgeometry (markup-option n :rgeometry))
-		     (transient (markup-option n :transient))
-		     (transient-opt (markup-option n :transient-opt))
-		     (cmd (markup-option n :command)))
-		  (let* ((a (string-append "ephemeral="
-					   (symbol->string (gensym))))
-			 (c (cond
-			       (geometry
-				(string-append cmd " "
-					       geometry-opt " "
-					       geometry))
-			       (rgeometry
-				(multiple-value-bind (aopt dopt)
-				   (advi-geometry rgeometry)
-				   (set! a (string-append a "," aopt))
-				   (string-append cmd " "
-						  geometry-opt " "
-						  dopt)))
-			       (else
-				cmd)))
-			 (c (if (and transient transient-opt)
-				(string-append c " " transient-opt " !p")
-				c)))
-		     (printf "\\adviembed[~a]{~a}\n" a c)))))
-      (set! &latex-record advi-record)
-      (set! &latex-play advi-play)
-      (set! &latex-play* advi-play*)))
-
-;*---------------------------------------------------------------------*/
-;*    %slide-prosper-setup! ...                                        */
-;*---------------------------------------------------------------------*/
-(define (%slide-prosper-setup!)
-   (skribe-message "Generating `Prosper' slides...\n")
-   (let ((le (find-engine 'latex))
-	 (be (find-engine 'base))
-	 (overlay-count 0))
-      ;; transitions
-      (define (prosper-transition trans)
-	 (cond
-	    ((string? trans)
-	     (printf "[~s]" trans))
-	    ((eq? trans 'slide)
-	     (printf "[Blinds]"))
-	    ((and (symbol? trans)
-		  (memq trans '(split blinds box wipe dissolve glitter)))
-	     (printf "[~s]"
-		     (string-upcase (symbol->string trans))))
-	    (else
-	     #f)))
-      ;; latex configuration
-      (define (prosper-slide n e)
-	 (let* ((i (markup-option n :image))
-		(t (markup-option n :title))
-		(lt (markup-option n :transition))
-		(gt (engine-custom e 'transition))
-		(pa (search-down (lambda (x) (is-markup? x 'slide-pause)) n))
-		(lpa (length pa)))
-	    (set! overlay-count 1)
-	    (if (>= lpa 1) (printf "\\overlays{~a}{%\n" (+ 1 lpa)))
-	    (display "\\begin{slide}")
-	    (prosper-transition (or lt gt))
-	    (display "{")
-	    (output t e)
-	    (display "}\n")
-	    (output (markup-body n) e)
-	    (display "\\end{slide}\n")
-	    (if (>= lpa 1) (display "}\n"))
-	    (newline)
-	    (newline)))
-      (engine-custom-set! le 'documentclass "\\documentclass[pdf,skribe,slideColor,nototal]{prosper}\n")
-      (let* ((cap (engine-custom le 'slide-caption))
-	     (o (engine-custom le 'predocument))
-	     (n (if (string? cap)
-		    (format #f "~a\\slideCaption{~a}\n"
-			    &slide-prosper-predocument
-			    cap)
-		    &slide-prosper-predocument)))
-	 (engine-custom-set! le 'predocument
-	    (if (string? o) (string-append n o) n)))
-      (engine-custom-set! le 'hyperref-usepackage "\\usepackage{hyperref}\n")
-      ;; writers
-      (set! &latex-slide prosper-slide)
-      (set! &latex-pause
-	    (lambda (n e)
-	       (set! overlay-count (+ 1 overlay-count))
-	       (printf "\\FromSlide{~s}%\n" overlay-count)))))
-
-;*---------------------------------------------------------------------*/
-;*    Setup ...                                                        */
-;*---------------------------------------------------------------------*/
-(let* ((opt &slide-load-options)
-       (p (memq :prosper opt)))
-   (if (and (pair? p) (pair? (cdr p)) (cadr p))
-       ;; prosper
-       (set! %slide-latex-mode 'prosper)
-       (let ((a (memq :advi opt)))
-	  (if (and (pair? a) (pair? (cdr a)) (cadr a))
-	      ;; advi
-	      (set! %slide-latex-mode 'advi)))))
diff --git a/src/guile/skribilo/package/slide/Makefile.am b/src/guile/skribilo/package/slide/Makefile.am
new file mode 100644
index 0000000..e5fb908
--- /dev/null
+++ b/src/guile/skribilo/package/slide/Makefile.am
@@ -0,0 +1,4 @@
+guilemoduledir = $(GUILE_SITE)/skribilo/package/slide
+dist_guilemodule_DATA = latex.scm html.scm lout.scm
+
+## arch-tag: 56b5fa5c-bb6a-4692-b929-74bdd032431c
diff --git a/src/guile/skribilo/package/slide/html.scm b/src/guile/skribilo/package/slide/html.scm
new file mode 100644
index 0000000..5398fbf
--- /dev/null
+++ b/src/guile/skribilo/package/slide/html.scm
@@ -0,0 +1,106 @@
+;;; html.scm  --  HTML implementation of the `slide' package.
+;;;
+;;; Copyright 2003, 2004  Manuel Serrano
+;;;
+;;;
+;;; 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
+(define-skribe-module (skribilo package slide html)
+  :use-module (skribilo package slide))
+
+
+(define-public (%slide-html-initialize!)
+  (let ((he (find-engine 'html)))
+    (skribe-message "HTML slides setup...\n")
+    ;; &html-page-title
+    (markup-writer '&html-document-title he
+       ;;:predicate (lambda (n e) %slide-initialized)
+       :action html-slide-title)
+    ;; slide
+    (markup-writer 'slide he
+       :options '(:title :number :transition :toc :bg)
+       :before (lambda (n e)
+		  (printf "<a name=\"~a\">" (markup-ident n))
+		  (display "<br>\n"))
+       :action (lambda (n e)
+		  (let ((nb (markup-option n :number))
+			(t (markup-option n :title)))
+		     (skribe-eval
+		      (center
+			 (color :width (slide-body-width e)
+			    :bg (or (markup-option n :bg) "#ffffff")
+			    (table :width 100.
+			       (tr (th :align 'left
+				      (list
+				       (if nb
+					   (format #f "~a / ~a -- " nb
+						   (slide-number)))
+				       t)))
+			       (tr (td (hrule)))
+			       (tr (td :width 100. :align 'left
+				      (markup-body n))))
+			    (linebreak)))
+		      e)))
+       :after "<br>")
+    ;; slide-vspace
+    (markup-writer 'slide-vspace he
+       :action (lambda (n e) (display "<br>")))))
+
+;*---------------------------------------------------------------------*/
+;*    slide-body-width ...                                             */
+;*---------------------------------------------------------------------*/
+(define (slide-body-width e)
+   (let ((w (engine-custom e 'body-width)))
+      (if (or (number? w) (string? w)) w 95.)))
+
+;*---------------------------------------------------------------------*/
+;*    html-slide-title ...                                             */
+;*---------------------------------------------------------------------*/
+(define (html-slide-title n e)
+   (let* ((title (markup-body n))
+	  (authors (markup-option n 'author))
+	  (tbg (engine-custom e 'title-background))
+	  (tfg (engine-custom e 'title-foreground))
+	  (tfont (engine-custom e 'title-font)))
+      (printf "<center><table cellspacing='0' cellpadding='0' width=\"~a\" class=\"skribetitle\"><tbody>\n<tr>"
+	      (html-width (slide-body-width e)))
+      (if (string? tbg)
+	  (printf "<td bgcolor=\"~a\">" tbg)
+	  (display "<td>"))
+      (if (string? tfg)
+	  (printf "<font color=\"~a\">" tfg))
+      (if title
+	  (begin
+	     (display "<center>")
+	     (if (string? tfont)
+		 (begin
+		    (printf "<font ~a><strong>" tfont)
+		    (output title e)
+		    (display "</strong></font>"))
+		 (begin
+		    (printf "<div class=\"skribetitle\"><strong><big><big><big>")
+		    (output title e)
+		    (display "</big></big></big></strong</div>")))
+	     (display "</center>\n")))
+      (if (not authors)
+	  (display "\n")
+	  (html-title-authors authors e))
+      (if (string? tfg)
+	  (display "</font>"))
+      (display "</td></tr></tbody></table></center>\n")))
+
+
+;;; arch-tag: 8be0cdf2-b755-4baa-baf6-739cdd00e193
diff --git a/src/guile/skribilo/package/slide/latex.scm b/src/guile/skribilo/package/slide/latex.scm
new file mode 100644
index 0000000..15f4535
--- /dev/null
+++ b/src/guile/skribilo/package/slide/latex.scm
@@ -0,0 +1,385 @@
+;;; latex.scm  --  LaTeX implementation of the `slide' package.
+;;;
+;;; Copyright 2003, 2004  Manuel Serrano
+;;;
+;;;
+;;; 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
+(define-skribe-module (skribilo package slide latex)
+  :use-module (skribilo package slide))
+
+
+(define-public %slide-latex-mode 'seminar)
+
+(define-public (%slide-latex-initialize!)
+  (case %slide-latex-mode
+    ((seminar)
+     (%slide-seminar-setup!))
+    ((advi)
+     (%slide-advi-setup!))
+    ((prosper)
+     (%slide-prosper-setup!))
+    (else
+     (skribe-error 'slide "Illegal latex mode" %slide-latex-mode))))
+
+;*---------------------------------------------------------------------*/
+;*    &slide-seminar-predocument ...                                   */
+;*---------------------------------------------------------------------*/
+(define &slide-seminar-predocument
+   "\\special{landscape}
+   \\slideframe{none}
+   \\centerslidesfalse
+   \\raggedslides[0pt]
+   \\renewcommand{\\slideleftmargin}{0.2in}
+   \\renewcommand{\\slidetopmargin}{0.3in}
+   \\newdimen\\slidewidth \\slidewidth 9in")
+
+;*---------------------------------------------------------------------*/
+;*    &slide-seminar-maketitle ...                                     */
+;*---------------------------------------------------------------------*/
+(define &slide-seminar-maketitle
+   "\\def\\labelitemi{$\\bullet$}
+   \\def\\labelitemii{$\\circ$}
+   \\def\\labelitemiii{$\\diamond$}
+   \\def\\labelitemiv{$\\cdot$}
+   \\pagestyle{empty}
+   \\slideframe{none}
+   \\centerslidestrue
+   \\begin{slide}
+   \\date{}
+   \\maketitle
+   \\end{slide}
+   \\slideframe{none}
+   \\centerslidesfalse")
+
+;*---------------------------------------------------------------------*/
+;*    &slide-prosper-predocument ...                                   */
+;*---------------------------------------------------------------------*/
+(define &slide-prosper-predocument
+   "\\slideCaption{}\n")
+
+;*---------------------------------------------------------------------*/
+;*    latex                                                            */
+;*---------------------------------------------------------------------*/
+(define &latex-slide #f)
+(define &latex-pause #f)
+(define &latex-embed #f)
+(define &latex-record #f)
+(define &latex-play #f)
+(define &latex-play* #f)
+
+;;; FIXME: We shouldn't load `latex.scm' from here.  Instead, we should
+;;; register a hook on its load.
+(let ((le (find-engine 'latex)))
+   ;; slide-vspace
+   (markup-writer 'slide-vspace le
+      :options '(:unit)
+      :action (lambda (n e)
+		 (display "\n\\vspace{")
+		 (output (markup-body n) e)
+		 (printf " ~a}\n\n" (markup-option n :unit))))
+   ;; slide-slide
+   (markup-writer 'slide le
+      :options '(:title :number :transition :vfill :toc :vspace :image)
+      :action (lambda (n e)
+		 (if (procedure? &latex-slide)
+		     (&latex-slide n e))))
+   ;; slide-pause
+   (markup-writer 'slide-pause le
+      :options '()
+      :action (lambda (n e)
+		 (if (procedure? &latex-pause)
+		     (&latex-pause n e))))
+   ;; slide-embed
+   (markup-writer 'slide-embed le
+      :options '(:alt :command :geometry-opt :geometry
+		      :rgeometry :transient :transient-opt)
+      :action (lambda (n e)
+		 (if (procedure? &latex-embed)
+		     (&latex-embed n e))))
+   ;; slide-record
+   (markup-writer 'slide-record le
+      :options '(:tag :play)
+      :action (lambda (n e)
+		 (if (procedure? &latex-record)
+		     (&latex-record n e))))
+   ;; slide-play
+   (markup-writer 'slide-play le
+      :options '(:tag :color)
+      :action (lambda (n e)
+		 (if (procedure? &latex-play)
+		     (&latex-play n e))))
+   ;; slide-play*
+   (markup-writer 'slide-play* le
+      :options '(:tag :color :scolor)
+      :action (lambda (n e)
+		 (if (procedure? &latex-play*)
+		     (&latex-play* n e)))))
+
+;*---------------------------------------------------------------------*/
+;*    %slide-seminar-setup! ...                                        */
+;*---------------------------------------------------------------------*/
+(define (%slide-seminar-setup!)
+   (skribe-message "Seminar slides setup...\n")
+   (let ((le (find-engine 'latex))
+	 (be (find-engine 'base)))
+      ;; latex configuration
+      (define (seminar-slide n e)
+	 (let ((nb (markup-option n :number))
+	       (t (markup-option n :title)))
+	    (display "\\begin{slide}\n")
+	    (if nb (printf "~a/~a -- " nb (slide-number)))
+	    (output t e)
+	    (display "\\hrule\n"))
+	 (output (markup-body n) e)
+	 (if (markup-option n :vill) (display "\\vfill\n"))
+	 (display "\\end{slide}\n"))
+      (engine-custom-set! le 'documentclass
+	 "\\documentclass[landscape]{seminar}\n")
+      (let ((o (engine-custom le 'predocument)))
+	 (engine-custom-set! le 'predocument
+	    (if (string? o)
+		(string-append &slide-seminar-predocument o)
+		&slide-seminar-predocument)))
+      (engine-custom-set! le 'maketitle
+	 &slide-seminar-maketitle)
+      (engine-custom-set! le 'hyperref-usepackage
+	 "\\usepackage[setpagesize=false]{hyperref}\n")
+      ;; slide-slide
+      (set! &latex-slide seminar-slide)))
+
+;*---------------------------------------------------------------------*/
+;*    %slide-advi-setup! ...                                           */
+;*---------------------------------------------------------------------*/
+(define (%slide-advi-setup!)
+   (skribe-message "Generating `Advi Seminar' slides...\n")
+   (let ((le (find-engine 'latex))
+	 (be (find-engine 'base)))
+      (define (advi-geometry geo)
+	 (let ((r (pregexp-match "([0-9]+)x([0-9]+)" geo)))
+	    (if (pair? r)
+		(let* ((w (cadr r))
+		       (w' (string->integer w))
+		       (w'' (number->string (/ w' *skribe-slide-advi-scale*)))
+		       (h (caddr r))
+		       (h' (string->integer h))
+		       (h'' (number->string (/ h' *skribe-slide-advi-scale*))))
+		   (values "" (string-append w "x" h "+!x+!y")))
+		(let ((r (pregexp-match "([0-9]+)x([0-9]+)[+](-?[0-9]+)[+](-?[0-9]+)" geo)))
+		   (if (pair? r)
+		       (let ((w (number->string (/ (string->integer (cadr r))
+						   *skribe-slide-advi-scale*)))
+			     (h (number->string (/ (string->integer (caddr r))
+						   *skribe-slide-advi-scale*)))
+			     (x (cadddr r))
+			     (y (car (cddddr r))))
+			  (values (string-append "width=" w "cm,height=" h "cm")
+				  "!g"))
+		       (values "" geo))))))
+      (define (advi-transition trans)
+	 (cond
+	    ((string? trans)
+	     (printf "\\advitransition{~s}" trans))
+	    ((and (symbol? trans)
+		  (memq trans '(wipe block slide)))
+	     (printf "\\advitransition{~s}" trans))
+	    (else
+	     #f)))
+      ;; latex configuration
+      (define (advi-slide n e)
+	 (let ((i (markup-option n :image))
+	       (n (markup-option n :number))
+	       (t (markup-option n :title))
+	       (lt (markup-option n :transition))
+	       (gt (engine-custom e 'transition)))
+	    (if (and i (engine-custom e 'advi))
+		(printf "\\advibg[global]{image=~a}\n"
+			(if (and (pair? i)
+				 (null? (cdr i))
+				 (string? (car i)))
+			    (car i)
+			    i)))
+	    (display "\\begin{slide}\n")
+	    (advi-transition (or lt gt))
+	    (if n (printf "~a/~a -- " n (slide-number)))
+	    (output t e)
+	    (display "\\hrule\n"))
+	 (output (markup-body n) e)
+	 (if (markup-option n :vill) (display "\\vfill\n"))
+	 (display "\\end{slide}\n\n\n"))
+      ;; advi record
+      (define (advi-record n e)
+	 (display "\\advirecord")
+	 (when (markup-option n :play) (display "[play]"))
+	 (printf "{~a}{" (markup-option n :tag))
+	 (output (markup-body n) e)
+	 (display "}"))
+      ;; advi play
+      (define (advi-play n e)
+	 (display "\\adviplay")
+	 (let ((c (markup-option n :color)))
+	    (when c
+	       (display "[")
+	       (display (skribe-get-latex-color c))
+	       (display "]")))
+	 (printf "{~a}" (markup-option n :tag)))
+      ;; advi play*
+      (define (advi-play* n e)
+	 (let ((c (skribe-get-latex-color (markup-option n :color)))
+	       (d (skribe-get-latex-color (markup-option n :scolor))))
+	    (let loop ((lbls (markup-body n))
+		       (last #f))
+	       (when last
+		  (display "\\adviplay[")
+		  (display d)
+		  (printf "]{~a}" last))
+	       (when (pair? lbls)
+		  (let ((lbl (car lbls)))
+		     (match-case lbl
+			((?id ?col)
+			 (display "\\adviplay[")
+			 (display (skribe-get-latex-color col))
+			 (printf "]{" ~a "}" id)
+			 (skribe-eval (slide-pause) e)
+			 (loop (cdr lbls) id))
+			(else
+			 (display "\\adviplay[")
+			 (display c)
+			 (printf "]{~a}" lbl)
+			 (skribe-eval (slide-pause) e)
+			 (loop (cdr lbls) lbl))))))))
+      (engine-custom-set! le 'documentclass
+	 "\\documentclass{seminar}\n")
+      (let ((o (engine-custom le 'predocument)))
+	 (engine-custom-set! le 'predocument
+	    (if (string? o)
+		(string-append &slide-seminar-predocument o)
+		&slide-seminar-predocument)))
+      (engine-custom-set! le 'maketitle
+	 &slide-seminar-maketitle)
+      (engine-custom-set! le 'usepackage
+	 (string-append "\\usepackage{advi}\n"
+			(engine-custom le 'usepackage)))
+      ;; slide
+      (set! &latex-slide advi-slide)
+      (set! &latex-pause
+	    (lambda (n e) (display "\\adviwait\n")))
+      (set! &latex-embed
+	    (lambda (n e)
+	       (let ((geometry-opt (markup-option n :geometry-opt))
+		     (geometry (markup-option n :geometry))
+		     (rgeometry (markup-option n :rgeometry))
+		     (transient (markup-option n :transient))
+		     (transient-opt (markup-option n :transient-opt))
+		     (cmd (markup-option n :command)))
+		  (let* ((a (string-append "ephemeral="
+					   (symbol->string (gensym))))
+			 (c (cond
+			       (geometry
+				(string-append cmd " "
+					       geometry-opt " "
+					       geometry))
+			       (rgeometry
+				(multiple-value-bind (aopt dopt)
+				   (advi-geometry rgeometry)
+				   (set! a (string-append a "," aopt))
+				   (string-append cmd " "
+						  geometry-opt " "
+						  dopt)))
+			       (else
+				cmd)))
+			 (c (if (and transient transient-opt)
+				(string-append c " " transient-opt " !p")
+				c)))
+		     (printf "\\adviembed[~a]{~a}\n" a c)))))
+      (set! &latex-record advi-record)
+      (set! &latex-play advi-play)
+      (set! &latex-play* advi-play*)))
+
+;*---------------------------------------------------------------------*/
+;*    %slide-prosper-setup! ...                                        */
+;*---------------------------------------------------------------------*/
+(define (%slide-prosper-setup!)
+   (skribe-message "Generating `Prosper' slides...\n")
+   (let ((le (find-engine 'latex))
+	 (be (find-engine 'base))
+	 (overlay-count 0))
+      ;; transitions
+      (define (prosper-transition trans)
+	 (cond
+	    ((string? trans)
+	     (printf "[~s]" trans))
+	    ((eq? trans 'slide)
+	     (printf "[Blinds]"))
+	    ((and (symbol? trans)
+		  (memq trans '(split blinds box wipe dissolve glitter)))
+	     (printf "[~s]"
+		     (string-upcase (symbol->string trans))))
+	    (else
+	     #f)))
+      ;; latex configuration
+      (define (prosper-slide n e)
+	 (let* ((i (markup-option n :image))
+		(t (markup-option n :title))
+		(lt (markup-option n :transition))
+		(gt (engine-custom e 'transition))
+		(pa (search-down (lambda (x) (is-markup? x 'slide-pause)) n))
+		(lpa (length pa)))
+	    (set! overlay-count 1)
+	    (if (>= lpa 1) (printf "\\overlays{~a}{%\n" (+ 1 lpa)))
+	    (display "\\begin{slide}")
+	    (prosper-transition (or lt gt))
+	    (display "{")
+	    (output t e)
+	    (display "}\n")
+	    (output (markup-body n) e)
+	    (display "\\end{slide}\n")
+	    (if (>= lpa 1) (display "}\n"))
+	    (newline)
+	    (newline)))
+      (engine-custom-set! le 'documentclass "\\documentclass[pdf,skribe,slideColor,nototal]{prosper}\n")
+      (let* ((cap (engine-custom le 'slide-caption))
+	     (o (engine-custom le 'predocument))
+	     (n (if (string? cap)
+		    (format #f "~a\\slideCaption{~a}\n"
+			    &slide-prosper-predocument
+			    cap)
+		    &slide-prosper-predocument)))
+	 (engine-custom-set! le 'predocument
+	    (if (string? o) (string-append n o) n)))
+      (engine-custom-set! le 'hyperref-usepackage "\\usepackage{hyperref}\n")
+      ;; writers
+      (set! &latex-slide prosper-slide)
+      (set! &latex-pause
+	    (lambda (n e)
+	       (set! overlay-count (+ 1 overlay-count))
+	       (printf "\\FromSlide{~s}%\n" overlay-count)))))
+
+;*---------------------------------------------------------------------*/
+;*    Setup ...                                                        */
+;*---------------------------------------------------------------------*/
+(let* ((opt &slide-load-options)
+       (p (memq :prosper opt)))
+   (if (and (pair? p) (pair? (cdr p)) (cadr p))
+       ;; prosper
+       (set! %slide-latex-mode 'prosper)
+       (let ((a (memq :advi opt)))
+	  (if (and (pair? a) (pair? (cdr a)) (cadr a))
+	      ;; advi
+	      (set! %slide-latex-mode 'advi)))))
+
+
+;;; arch-tag: b99e2c65-55f7-462c-8482-f47c7e223538
diff --git a/src/guile/skribilo/package/slide/lout.scm b/src/guile/skribilo/package/slide/lout.scm
new file mode 100644
index 0000000..f816469
--- /dev/null
+++ b/src/guile/skribilo/package/slide/lout.scm
@@ -0,0 +1,131 @@
+;;; lout.scm  --  Lout implementation of the `slide' package.
+;;;
+;;; Copyright 2005, 2006  Ludovic Courtès <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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+;;; USA.
+
+(define-skribe-module (skribilo package slide lout)
+  :use-module (skribilo utils syntax)
+
+  ;; FIXME: For some reason, changing the following `autoload' in
+  ;; `use-modules' doesn't work.
+
+  :autoload (skribilo engine lout) (lout-tagify lout-output-pdf-meta-info)
+  )
+
+
+(fluid-set! current-reader %skribilo-module-reader)
+
+;;; TODO:
+;;;
+;;; Make some more PS/PDF trickery.
+
+(format (current-error-port) "slide/lout.scm~%")
+
+(define-public (%slide-lout-initialize!)
+  (format (current-error-port) "Lout slides initializing...~%")
+
+  (let ((le (find-engine 'lout)))
+
+    ;; Automatically switch to the `slides' document type.
+    (engine-custom-set! le 'document-type 'slides)
+
+    (markup-writer 'slide le
+       :options '(:title :number :toc :ident) ;; '(:bg :vspace :image)
+
+       :validate (lambda (n e)
+		    (eq? (engine-custom e 'document-type) 'slides))
+
+       :before (lambda (n e)
+		  (display "\n@Overhead\n")
+		  (display "  @Title { ")
+		  (output (markup-option n :title) e)
+		  (display " }\n")
+		  (if (markup-ident n)
+		      (begin
+			 (display "  @Tag { ")
+			 (display (lout-tagify (markup-ident n)))
+			 (display " }\n")))
+		  (if (markup-option n :number)
+		      (begin
+			 (display "  @BypassNumber { ")
+			 (output (markup-option n :number) e)
+			 (display " }\n")))
+		  (display "@Begin\n")
+
+		  ;; `doc' documents produce their PDF outline right after
+		  ;; `@Text @Begin'; other types of documents must produce it
+		  ;; as part of their first chapter.
+		  (lout-output-pdf-meta-info (ast-document n) e))
+
+       :after "@End @Overhead\n")
+
+    (markup-writer 'slide-vspace le
+       :options '(:unit)
+       :validate (lambda (n e)
+		    (and (pair? (markup-body n))
+			 (number? (car (markup-body n)))))
+       :action (lambda (n e)
+		  (printf "\n//~a~a # slide-vspace\n"
+			  (car (markup-body n))
+			  (case (markup-option n :unit)
+			     ((cm)              "c")
+			     ((point points pt) "p")
+			     ((inch inches)     "i")
+			     (else
+			      (skribe-error 'lout
+					    "Unknown vspace unit"
+					    (markup-option n :unit)))))))
+
+    (markup-writer 'slide-pause le
+       ;; FIXME:  Use a `pdfmark' custom action and a PDF transition action.
+       ;; << /Type /Action
+       ;; << /S /Trans
+       ;; entry in the trans dict
+       ;; << /Type /Trans  /S /Dissolve >>
+       :action (lambda (n e)
+		 (let ((filter (make-string-replace lout-verbatim-encoding))
+		       (pdfmark "
+[ {ThisPage} << /Trans << /S /Wipe /Dm /V /D 3 /M /O >> >> /PUT pdfmark"))
+		   (display (lout-embedded-postscript-code
+			     (filter pdfmark))))))
+
+    ;; For movies, see
+    ;; http://www.tug.org/tex-archive/macros/latex/contrib/movie15/movie15.sty .
+    (markup-writer 'slide-embed le
+       :options '(:alt :geometry :rgeometry :geometry-opt :command)
+       ;; FIXME:  `pdfmark'.
+       ;; << /Type /Action   /S /Launch
+       :action (lambda (n e)
+		 (let ((command (markup-option n :command))
+		       (filter (make-string-replace lout-verbatim-encoding))
+		       (pdfmark "[ /Rect [ 0 ysize xsize 0 ]
+  /Name /Comment
+  /Contents (This is an embedded application)
+  /ANN pdfmark
+
+[ /Type /Action
+  /S    /Launch
+  /F    (~a)
+  /OBJ pdfmark"))
+		 (display (string-append
+			   "4c @Wide 3c @High "
+			   (lout-embedded-postscript-code
+			    (filter (format #f pdfmark command))))))))))
+
+
+;;; arch-tag: 0c717553-5cbb-46ed-937a-f844b6aeb145
diff --git a/src/guile/skribilo/utils/compat.scm b/src/guile/skribilo/utils/compat.scm
index 3fce068..9ed9f3e 100644
--- a/src/guile/skribilo/utils/compat.scm
+++ b/src/guile/skribilo/utils/compat.scm
@@ -136,30 +136,28 @@
     ("acmproc.skr"      . (skribilo package acmproc))))
 
 (define*-public (skribe-load file :rest args)
-  (call/cc
-   (lambda (return)
-     (guard (c ((file-search-error? c)
-		;; Regular file loading failed.  Try built-ins.
-		(let ((mod-name (assoc-ref %skribe-known-files file)))
-		  (if mod-name
-		      (begin
-			(if (> (*verbose*) 1)
-			    (format (current-error-port)
-				    "  skribe-load: `~a' -> `~a'~%"
-				    file mod-name))
-			(let ((mod (false-if-exception
-				    (resolve-module mod-name))))
-			  (if (not mod)
-			      (raise c)
-			      (begin
-				(set-module-uses!
-				 (current-module)
-				 (cons mod (module-uses (current-module))))
-				(return #t)))))
-		      (raise c)))))
-
-	    ;; Try a regular `load-document'.
-	    (apply load-document file args)))))
+  (guard (c ((file-search-error? c)
+	     ;; Regular file loading failed.  Try built-ins.
+	     (let ((mod-name (assoc-ref %skribe-known-files file)))
+	       (if mod-name
+		   (begin
+		     (if (> (*verbose*) 1)
+			 (format (current-error-port)
+				 "  skribe-load: `~a' -> `~a'~%"
+				 file mod-name))
+		     (let ((mod (false-if-exception
+				 (resolve-module mod-name))))
+		       (if (not mod)
+			   (raise c)
+			   (begin
+			     (set-module-uses!
+			      (current-module)
+			      (cons mod (module-uses (current-module))))
+			     #t))))
+		   (raise c)))))
+
+	 ;; Try a regular `load-document'.
+	 (apply load-document file args)))
 
 
 (define-public skribe-include      include-document)