Allow access to other XML docs in docx file like the headers and footers

lib/docx/document.rb

@@ -18,15 +18,24 @@ module Docx
   #     puts d.text
   #   end
   class Document
-    attr_reader :xml, :doc, :zip, :styles
+
+    # A path with * indicates that there are possibly multiple documents
+    # matching that glob, eg. word/header1.xml, word/header2.xml
+    DOCUMENT_PATHS = {
+      doc: "word/document.xml",
+      styles: "word/styles.xml",
+      headers: "word/header*.xml",
+      footers: "word/footer*.xml",
+      numbering: "word/numbering.xml"
+    }
+
+    attr_reader :xml, :doc, :zip, :styles, :headers, :footers, :numbering
 
     def initialize(path, &block)
       @replace = {}
       @zip = Zip::File.open(path)
-      @document_xml = @zip.read('word/document.xml')
-      @doc = Nokogiri::XML(@document_xml)
-      @styles_xml = @zip.read('word/styles.xml')
-      @styles = Nokogiri::XML(@styles_xml)
+      extract_documents
+
       if block_given?
         yield self
         @zip.close
@@ -123,13 +132,49 @@ def replace_entry(entry_path, file_contents)
 
     private
 
+    def extract_documents
+      DOCUMENT_PATHS.each do |attr_name, path|
+        if path.match /\*/
+          extract_multiple_documents_from_globbed_path(attr_name, path)
+        else
+          extract_single_document_from_path(attr_name, path)
+        end
+      end
+    end
+
+    def extract_single_document_from_path(attr_name, path)
+      if @zip.find_entry(path)
+        xml_doc = @zip.read(path)
+        self.instance_variable_set(:"@#{attr_name}", Nokogiri::XML(xml_doc))
+      end
+    end
+
+    def extract_multiple_documents_from_globbed_path(hash_attr_name, glob_path)
+      files = @zip.glob(glob_path).map { |h| h.name }
+      filename_and_contents_pairs = files.map do |file|
+        simple_file_name = file.sub(/^word\//, "").sub(/\.xml$/, "")
+        [simple_file_name, Nokogiri::XML(@zip.read(file))]
+      end 
+      hash = Hash[filename_and_contents_pairs]
+      self.instance_variable_set(:"@#{hash_attr_name}", hash)
+    end
+
     #--
     # TODO: Flesh this out to be compatible with other files
     # TODO: Method to set flag on files that have been edited, probably by inserting something at the
     # end of methods that make edits?
     #++
     def update
-      replace_entry "word/document.xml", doc.serialize(:save_with => 0)
+      DOCUMENT_PATHS.each do |attr_name, path|
+        if path.match /\*/
+          self.instance_variable_get("@#{attr_name}").each do |simple_file_name, contents|
+            replace_entry("word/#{simple_file_name}.xml", contents.serialize(:save_with => 0))
+          end
+        else
+          xml_document = self.instance_variable_get("@#{attr_name}")
+          replace_entry path, xml_document.serialize(:save_with => 0) if xml_document
+        end
+      end 
     end
 
     # generate Elements::Containers::Paragraph from paragraph XML node

spec/docx/document_spec.rb

@@ -279,6 +279,22 @@
     end
   end
 
+  describe 'multiple documents' do
+    before do
+      @doc = Docx::Document.open(@fixtures_path + '/multi_doc.docx')
+    end
+
+    it 'should extract all inner documents' do
+      expect(@doc.doc).to_not be_nil
+      expect(@doc.styles).to_not be_nil
+      expect(@doc.headers).to_not be_nil
+      expect(@doc.headers["header1"].text).to eq "Hello from the header."
+      expect(@doc.footers).to_not be_nil
+      expect(@doc.footers["footer1"].text).to eq "Hello from the footer."
+      expect(@doc.numbering).to_not be_nil
+    end
+  end
+
   describe 'saving' do
     before do
       @doc = Docx::Document.open(@fixtures_path + '/saving.docx')