Pathname#empty? implemented.

* ext/pathname/pathname.c (Pathname#empty?): New method.
  [ruby-core:76404] [Feature#12596] Proposed by John Backus.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56571 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Author: akr

ChangeLog

@@ -1,3 +1,8 @@
+Sat Nov  5 12:14:31 2016  Tanaka Akira  <akr@fsij.org>
+
+	* ext/pathname/pathname.c (Pathname#empty?): New method.
+	  [ruby-core:76404] [Feature#12596] Proposed by John Backus.
+
 Sat Nov  5 11:53:02 2016  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* test/ruby/test_refinement.rb (test_refine_alias_in_subclass):

NEWS

@@ -180,6 +180,9 @@ with all sufficient information, see the ChangeLog file or Redmine
 
   * Add an into option. [Feature #11191]
 
+* pathname
+  * New method: Pathname#empty? [Feature#12596]
+
 * WEBrick
 
   * Don't allow , as a separator [Bug #12791]

ext/pathname/pathname.c

@@ -990,6 +990,22 @@ path_zero_p(VALUE self)
     return rb_funcall(rb_mFileTest, rb_intern("zero?"), 1, get_strpath(self));
 }
 
+/*
+ * Tests the file is empty.
+ *
+ * See Dir#empty? and FileTest.empty?.
+ */
+static VALUE
+path_empty_p(VALUE self)
+{
+
+    VALUE path = get_strpath(self);
+    if (RTEST(rb_funcall(rb_mFileTest, rb_intern("directory?"), 1, path)))
+        return rb_funcall(rb_cDir, rb_intern("empty?"), 1, path);
+    else
+        return rb_funcall(rb_mFileTest, rb_intern("empty?"), 1, path);
+}
+
 static VALUE
 glob_i(RB_BLOCK_CALL_FUNC_ARGLIST(elt, klass))
 {
@@ -1452,6 +1468,7 @@ Init_pathname(void)
     rb_define_method(rb_cPathname, "world_writable?", path_world_writable_p, 0);
     rb_define_method(rb_cPathname, "writable_real?", path_writable_real_p, 0);
     rb_define_method(rb_cPathname, "zero?", path_zero_p, 0);
+    rb_define_method(rb_cPathname, "empty?", path_empty_p, 0);
     rb_define_singleton_method(rb_cPathname, "glob", path_s_glob, -1);
     rb_define_singleton_method(rb_cPathname, "getwd", path_s_getwd, 0);
     rb_define_singleton_method(rb_cPathname, "pwd", path_s_getwd, 0);

test/pathname/test_pathname.rb

@@ -1212,6 +1212,20 @@ def test_zero?
     }
   end
 
+  def test_empty?
+    with_tmpchdir('rubytest-pathname') {|dir|
+      open("nonemptyfile", "w") {|f| f.write "abc" }
+      open("emptyfile", "w") {|f| }
+      Dir.mkdir("nonemptydir")
+      open("nonemptydir/somefile", "w") {|f| }
+      Dir.mkdir("emptydir")
+      assert_equal(true, Pathname("emptyfile").empty?)
+      assert_equal(false, Pathname("nonemptyfile").empty?)
+      assert_equal(true, Pathname("emptydir").empty?)
+      assert_equal(false, Pathname("nonemptydir").empty?)
+    }
+  end
+
   def test_s_glob
     with_tmpchdir('rubytest-pathname') {|dir|
       open("f", "w") {|f| f.write "abc" }