Implement styles

lib/ezdoc/xml/relationships.rb

@@ -21,24 +21,38 @@ module Ezdoc
 
     class DocumentRelationships
       NAMESPACE = "http://schemas.openxmlformats.org/package/2006/relationships"
+      STYLES_TYPE = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/styles"
+      NUMBERING_TYPE = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering"
       IMAGE_TYPE = "http://schemas.openxmlformats.org/officeDocument/2006/relationships/image"
 
-      def initialize(has_numbering: false, images: [])
+      def initialize(has_numbering: false, images: [], has_styles: false)
         @has_numbering = has_numbering
         @images = images
+        @has_styles = has_styles
       end
 
       def to_xml
         builder = Nokogiri::XML::Builder.new(encoding: "UTF-8") do |xml|
           xml.Relationships(xmlns: NAMESPACE) do
-            if @has_numbering
+            # rId1 = styles.xml (always first when present)
+            if @has_styles
               xml.Relationship(
                 Id: "rId1",
-                Type: "http://schemas.openxmlformats.org/officeDocument/2006/relationships/numbering",
+                Type: STYLES_TYPE,
+                Target: "styles.xml"
+              )
+            end
+
+            # rId2 = numbering.xml (if lists present)
+            if @has_numbering
+              xml.Relationship(
+                Id: "rId2",
+                Type: NUMBERING_TYPE,
                 Target: "numbering.xml"
               )
             end
 
+            # Images start at rId2 or rId3 depending on numbering
             @images.each do |image|
               xml.Relationship(
                 Id: image.rid,