* Result block value for SevenZipReader.open & .open_file

They were always returning `nil` (from SevenZipReader#close_file)

Also changed &block + block.call to block_given? + yield

Author: PikachuEXE

lib/seven_zip_ruby/seven_zip_reader.rb

@@ -98,13 +98,17 @@ class << self
       #   SevenZipRuby::Reader.open(stream) do |szr|
       #     szr.extract(:all, "path_to_dir")
       #   end
-      def open(stream, param = {}, &block)  # :yield: szr
+      def open(stream, param = {})  # :yield: szr
         szr = self.new
         szr.open(stream, param)
-        if (block)
+        # Using `block_given?`, `yield` & omitting `&block`
+        # is faster
+        # Ref: https://github.com/JuanitoFatas/fast-ruby#proccall-and-block-arguments-vs-yieldcode
+        if block_given?
           begin
-            block.call(szr)
-            szr.close
+            yield(szr).tap do
+              szr.close
+            end
           ensure
             szr.close_file
           end
@@ -135,13 +139,17 @@ def open(stream, param = {}, &block)  # :yield: szr
       #   szr = SevenZipRuby::SevenZipReader.open_file("filename.7z")
       #   # Read and extract archive.
       #   szr.close
-      def open_file(filename, param = {}, &block)  # :yield: szr
+      def open_file(filename, param = {})  # :yield: szr
         szr = self.new
         szr.open_file(filename, param)
-        if (block)
+        # Using `block_given?`, `yield` & omitting `&block`
+        # is faster
+        # Ref: https://github.com/JuanitoFatas/fast-ruby#proccall-and-block-arguments-vs-yieldcode
+        if block_given?
           begin
-            block.call(szr)
-            szr.close
+            yield(szr).tap do
+              szr.close
+            end
           ensure
             szr.close_file
           end

spec/seven_zip_ruby_spec.rb

@@ -97,6 +97,40 @@
       end
     end
 
+    describe "singleton method: open" do
+      context "called with block" do
+        let(:block_value) { "Block value" }
+
+        subject(:returned_result) do
+          File.open(SevenZipRubySpecHelper::SEVEN_ZIP_FILE, "rb") do |file|
+            SevenZipRuby::SevenZipReader.open(file) do |_szr|
+              block_value
+            end
+          end
+        end
+
+        it "returns block value" do
+          should eq(block_value)
+        end
+      end
+    end
+
+    describe "singleton method: open_file" do
+      context "called with block" do
+        let(:block_value) { "Block value" }
+
+        subject(:returned_result) do
+          SevenZipRuby::SevenZipReader.open_file(SevenZipRubySpecHelper::SEVEN_ZIP_FILE) do |_szr|
+            block_value
+          end
+        end
+
+        it "returns block value" do
+          should eq(block_value)
+        end
+      end
+    end
+
     example "extract archive" do
       File.open(SevenZipRubySpecHelper::SEVEN_ZIP_FILE, "rb") do |file|
         SevenZipRuby::SevenZipReader.open(file) do |szr|