resolves #577 display title for open block (PR #581)

* resolves #577 display title of open block
* slighly reduce font size of block title (aka caption) in default theme

data/themes/default-theme.yml

@@ -117,6 +117,7 @@ block:
   margin_bottom: $vertical_rhythm
 caption:
   align: left
+  font_size: $base_font_size * 0.95
   font_style: italic
   # FIXME perhaps set line_height instead of / in addition to margins?
   margin_inside: $vertical_rhythm / 3

lib/asciidoctor-pdf/converter.rb

@@ -523,18 +523,15 @@ def convert_example node
   end
 
   def convert_open node
-    case node.style
-    when 'abstract'
+    if node.style == 'abstract'
       convert_abstract node
-    when 'partintro'
-      if node.blocks.size == 1 && node.blocks.first.style == 'abstract'
-        convert_abstract node.blocks.first
-      else
-        add_dest_for_block node if node.id
-        convert_content_for_block node
-      end
+    elsif node.style == 'partintro' && node.blocks.size == 1 && node.blocks.first.style == 'abstract'
+      # TODO process block title and id
+      # TODO process abstract child even when partintro has multiple blocks
+      convert_abstract node.blocks.first
     else
       add_dest_for_block node if node.id
+      layout_caption node.title if node.title?
       convert_content_for_block node
     end
   end