csv.rb: foreach enumerator

* lib/csv.rb (CSV.foreach): support enumerator.  based on a patch by
  Hanmac (Hans Mackowiak) at [ruby-core:57643].  [ruby-core:57283]
  [Feature #8929]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43135 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 13 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index befeadb615..c1a01556bb 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Fri Oct  4 09:32:33 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/csv.rb (CSV.foreach): support enumerator.  based on a patch by
+	  Hanmac (Hans Mackowiak) at [ruby-core:57643].  [ruby-core:57283]
+	  [Feature #8929]
+
 Thu Oct  3 18:20:47 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* win32/win32.c (console_emulator_p, constat_handle): disable built-in
diff --git a/lib/csv.rb b/lib/csv.rb
index b6d9121146..15f06c96f8 100644
--- a/lib/csv.rb
+++ b/lib/csv.rb
@@ -1116,6 +1116,7 @@ class CSV
   # but transcode it to UTF-8 before CSV parses it.
   #
   def self.foreach(path, options = Hash.new, &block)
+    return to_enum(__method__, path, options) unless block
     open(path, options) do |csv|
       csv.each(&block)
     end
diff --git a/test/csv/test_interface.rb b/test/csv/test_interface.rb
index 73e6ca9a4a..ad310fae49 100755
--- a/test/csv/test_interface.rb
+++ b/test/csv/test_interface.rb
@@ -40,6 +40,12 @@ class TestCSV::Interface < TestCSV
     end
   end
 
+  def test_foreach_enum
+    CSV.foreach(@path, col_sep: "\t", row_sep: "\r\n").zip(@expected) do |row, exp|
+      assert_equal(exp, row)
+    end
+  end
+
   def test_open_and_close
     csv = CSV.open(@path, "r+", col_sep: "\t", row_sep: "\r\n")
     assert_not_nil(csv)