slide: Add `:unfold?' option to `slide-topic'.

* doc/user/slide.skb: Update.

* src/guile/skribilo/package/slide.scm (slide-topic,
  slide-subtopic)[:unfold?]: New argument.

* src/guile/skribilo/package/slide/base.scm (make-outline-slide): Honor
  `:unfold?'.
  (slide-topic, slide-subtopic): Mark `:unfold?' as supported.

2 files changed, 14 insertions, 11 deletions

diff --git a/src/guile/skribilo/package/slide.scm b/src/guile/skribilo/package/slide.scm
index 2f5d8a8..3195515 100644
--- a/src/guile/skribilo/package/slide.scm
+++ b/src/guile/skribilo/package/slide.scm
@@ -251,7 +251,7 @@
 ;*    slide-topic ...                                                  */
 ;*---------------------------------------------------------------------*/
 (define-markup (slide-topic :rest opt
-			    :key title (outline? #t)
+			    :key title (outline? #t) (unfold? #t)
                             (ident #f) (class #f))
    (new container
       (markup 'slide-topic)
@@ -260,14 +260,15 @@
       (class class)
       (loc   &invocation-location)
       (options `((:outline? ,outline?)
-                 ,@(the-options opt :outline? :class)))
+                 (:unfold?  ,unfold?)
+                 ,@(the-options opt :outline? :unfold? :class)))
       (body (the-body opt))))
 
 ;*---------------------------------------------------------------------*/
 ;*    slide-subtopic ...                                               */
 ;*---------------------------------------------------------------------*/
 (define-markup (slide-subtopic :rest opt
-			       :key title (outline? #f)
+			       :key title (outline? #f) (unfold? #f)
                                (ident #f) (class #f))
    (new container
       (markup 'slide-subtopic)
@@ -276,6 +277,7 @@
       (class class)
       (loc   &invocation-location)
       (options `((:outline? ,outline?)
+                 (:unfold?  ,unfold?)
                  ,@(the-options opt :outline? :class)))
       (body (the-body opt))))
 
diff --git a/src/guile/skribilo/package/slide/base.scm b/src/guile/skribilo/package/slide/base.scm
index 2532221..f2d0209 100644
--- a/src/guile/skribilo/package/slide/base.scm
+++ b/src/guile/skribilo/package/slide/base.scm
@@ -148,23 +148,24 @@
 
 
 (define (make-outline-slide topic engine)
-  (let ((parent-topic (if (is-markup? topic 'slide-topic)
-                          topic
-                          (find1-up (lambda (n)
-                                      (is-markup? n 'slide-topic))
-                                    topic))))
+  (let* ((parent-topic (if (is-markup? topic 'slide-topic)
+                           topic
+                           (find1-up (lambda (n)
+                                       (is-markup? n 'slide-topic))
+                                     topic)))
+         (unfold?      (markup-option topic :unfold?)))
     (output (slide :title %slide-outline-title :toc #f
                    :class (markup-class topic)
                    ;; The mark below is needed for cross-referencing by PDF
                    ;; bookmarks.
                    (if (markup-ident topic) (mark (markup-ident topic)) "")
-                   (p (make-topic-list parent-topic #t
+                   (p (make-topic-list parent-topic unfold?
                                        make-topic-entry)))
             engine)))
 
 
 (markup-writer 'slide-topic (find-engine 'base)
-   :options '(:title :outline? :class :ident)
+   :options '(:title :outline? :class :ident :unfold?)
    :action (lambda (n e)
 	      (if (markup-option n :outline?)
 		  (make-outline-slide n e))
@@ -173,7 +174,7 @@
 
 (markup-writer 'slide-subtopic (find-engine 'base)
    ;; FIXME: Largely untested.
-   :options '(:title :outline? :class :ident)
+   :options '(:title :outline? :class :ident :unfold?)
    :action (lambda (n e)
 	      (if (markup-option n :outline?)
 		  (make-outline-slide n e))