support book doctype, streamline doc title accessors

- add doctype accessor to Document
- support the book doctype (multiple level-0 headings)
- polish and document logic for retrieving the document and header titles
- subtitute attributes in section titles
- tests for everything mentioned above

1 files changed, 24 insertions, 0 deletions

diff --git a/test/preamble_test.rb b/test/preamble_test.rb
index 1b3b4fc6..5ae997c8 100644
--- a/test/preamble_test.rb
+++ b/test/preamble_test.rb
@@ -85,4 +85,28 @@ Section paragraph 1.
     assert_xpath '//h2[@id="_first_section"]/preceding::p', result, 1
   end
 
+  test 'preamble in book doctype' do
+      input = <<-EOS
+Book
+====
+:doctype: book
+
+Back then...
+
+= Chapter One
+
+It was a dark and stormy night...
+
+= Chapter Two
+
+They couldn't believe their eyes when...
+      EOS
+
+      d = document_from_string(input)
+      assert_equal 'book', d.doctype 
+      output = d.render
+      assert_xpath '//h1', output, 3
+      assert_xpath '//*[@id="preamble"]//p[text() = "Back then..."]', output, 1
+  end
+
 end