Use BFS to detect ro-crate-metadata.json. Fixes #32

Author: fbacall

lib/ro_crate/reader.rb

@@ -306,12 +306,16 @@ def self.extract_root_entity(entities)
     # @param source [String, ::File, Pathname] The location of the directory.
     # @return [Pathname, nil] The path to the root, or nil if not found.
     def self.detect_root_directory(source)
-      Pathname(source).find do |entry|
+      queue = [source]
+      until queue.empty?
+        entry = Pathname(queue.shift)
         if entry.file?
           name = entry.basename.to_s
           if name == ROCrate::Metadata::IDENTIFIER || name == ROCrate::Metadata::IDENTIFIER_1_0
             return entry.parent
           end
+        elsif entry.directory?
+          queue += entry.children
         end
       end
 

test/fixtures/multi_metadata_crate.crate.zip

@@ -367,6 +367,12 @@ class ReaderTest < Test::Unit::TestCase
     assert_empty crate.data_entities
   end
 
+  test 'reads first metadata file it encounters' do
+    crate = ROCrate::Reader.read(fixture_file('multi_metadata_crate.crate.zip').path)
+
+    assert_equal 'At the root', crate.name
+  end
+
   private
 
   def check_exception(exception_class)