resolves #1164 add support for default theme alignment for tables

CHANGELOG.adoc

@@ -19,6 +19,7 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/master[
 * allow theme to control background and border of inline kbd (#313, #1004)
 * add support for link on image in running content (#1002)
 * allow theme to disable font kerning
+* add support for default theme alignment for tables (#1164)
 
 == 1.5.0.beta.1 (2019-07-08) - @mojavelinux
 

lib/asciidoctor-pdf/converter.rb

@@ -1957,7 +1957,7 @@ def convert_table node
         (alignment = (node.roles & BlockAlignmentNames)[-1])
       alignment = alignment.to_sym
     else
-      alignment = :left
+      alignment = (theme.table_align || :left).to_sym
     end
 
     caption_side = (theme.table_caption_side || :top).to_sym

spec/table_spec.rb

@@ -497,4 +497,29 @@
       (expect caption_texts.map {|it| it[:x] }.uniq).to have_size 1
     end
   end
+
+  context 'Table alignment' do
+    it 'should allow theme to customize default alignment of table ' do
+      pdf = to_pdf <<~'EOS', pdf_theme: { table_align: 'right' }, analyze: true
+      [cols=3*,width=50%]
+      |===
+      |RIGHT |B1 |C1
+      |A2 |B2 |C2
+      |A3 |B3 |C3
+      |===
+
+      [cols=3*,width=50%,align=left]
+      |===
+      |LEFT |B1 |C1
+      |A2 |B2 |C2
+      |A3 |B3 |C3
+      |===
+      EOS
+
+      cell_right = (pdf.find_text 'RIGHT')[0]
+      cell_left = (pdf.find_text 'LEFT')[0]
+
+      (expect cell_right[:x]).to be > cell_left[:x]
+    end
+  end
 end