Implement Tree#find_blob (#25)

* Add Tree#find_blob
* Require latest RJGit
* Decomplicate file mode logic

gollum-rjgit_adapter.gemspec

@@ -12,7 +12,7 @@ Gem::Specification.new do |s|
   s.summary     = %q{Adapter for Gollum to use RJGit at the backend.}
   s.description = %q{Adapter for Gollum to use RJGit at the backend.}
 
-  s.add_runtime_dependency "rjgit", "~> 6.1"
+  s.add_runtime_dependency "rjgit", "~> 6.5"
   s.add_development_dependency "rspec", "3.4.0"
 
   s.files         = Dir['lib/**/*.rb'] + ["README.md", "Gemfile"]

lib/rjgit_adapter/git_layer_rjgit.rb

@@ -437,7 +437,7 @@ def log(ref = Gollum::Git.default_ref_for_repo(@repo), path = nil, options = {})
       def lstree(sha, options={})
         entries = RJGit::Porcelain.ls_tree(@repo.jrepo, nil, @repo.find(sha, :tree), {:recursive => options[:recursive]})
         entries.map! do |entry| 
-          entry[:mode] = entry[:mode].to_s(8)
+          entry[:mode] = entry[:mode]
           entry[:sha]  = entry[:id]
           entry
         end
@@ -478,13 +478,21 @@ def id
       end
 
       def /(file)
-        @tree.send(:/, file)
+        obj = @tree.send(:/, file)
+        return nil if obj.nil?
+        obj.is_a?(RJGit::Tree) ? Gollum::Git::Tree.new(obj) : Gollum::Git::Blob.new(obj)
       end
 
       def blobs
         return Array.new if @tree == {}
         @tree.blobs.map{|blob| Gollum::Git::Blob.new(blob) }
       end
+
+      def find_blob(&block)
+        return nil unless block_given?
+        blob = @tree.find_blob {|blob| yield blob[:name] }
+        blob ? Gollum::Git::Blob.new(blob) : nil
+      end
     end
 
     class NoSuchShaFound < StandardError