file.c: File.empty?

* file.c (Init_File): add alias File.empty? to File.zero?.
  [Feature #9969]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54559 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 13 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index f704ffef55..dc21137af3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Apr 13 14:47:47 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* file.c (Init_File): add alias File.empty? to File.zero?.
+	  [Feature #9969]
+
 Wed Apr 13 14:36:24 2016  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (assign_in_cond): allow multiple assignment in
diff --git a/file.c b/file.c
index bcadaefd9e..f2e299623f 100644
--- a/file.c
+++ b/file.c
@@ -5886,6 +5886,7 @@ Init_File(void)
     define_filetest_function("executable_real?", rb_file_executable_real_p, 1);
     define_filetest_function("file?", rb_file_file_p, 1);
     define_filetest_function("zero?", rb_file_zero_p, 1);
+    define_filetest_function("empty?", rb_file_zero_p, 1);
     define_filetest_function("size?", rb_file_size_p, 1);
     define_filetest_function("size", rb_file_s_size, 1);
     define_filetest_function("owned?", rb_file_owned_p, 1);
diff --git a/test/ruby/test_file_exhaustive.rb b/test/ruby/test_file_exhaustive.rb
index 3e030309b6..4538cf3b61 100644
--- a/test/ruby/test_file_exhaustive.rb
+++ b/test/ruby/test_file_exhaustive.rb
@@ -399,6 +399,13 @@ class TestFileExhaustive < Test::Unit::TestCase
     assert_file.not_zero?(nofile)
   end
 
+  def test_empty_p
+    assert_nothing_raised { File.empty?(@dir) }
+    assert_file.not_empty?(regular_file)
+    assert_file.empty?(zerofile)
+    assert_file.not_empty?(nofile)
+  end
+
   def test_size_p
     assert_nothing_raised { File.size?(@dir) }
     assert_equal(3, File.size?(regular_file))