logger.rb: end of week should be Saturday

* lib/logger.rb (Logger::Period#previous_period_end): as weekly
  rotation shifts the log file on Sundays, the end date of the
  previous period should be Saturdays.  fix r45072.
  [ruby-dev:49314] [Bug #11622]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@52297 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Tue Oct 27 16:18:12 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* lib/logger.rb (Logger::Period#previous_period_end): as weekly
+	  rotation shifts the log file on Sundays, the end date of the
+	  previous period should be Saturdays.  fix r45072.
+	  [ruby-dev:49314] [Bug #11622]
+
 Tue Oct 27 16:12:37 2015  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* vm_dump.c (rb_print_backtrace): our addr2line doesn't work on sparc.

lib/logger.rb

@@ -556,7 +556,7 @@ private
       when 'daily'
         t = Time.mktime(now.year, now.month, now.mday) - SiD / 2
       when 'weekly'
-        t = Time.mktime(now.year, now.month, now.mday) - (SiD * (now.wday + 1) + SiD / 2)
+        t = Time.mktime(now.year, now.month, now.mday) - (SiD * now.wday + SiD / 2)
       when 'monthly'
         t = Time.mktime(now.year, now.month, 1) - SiD / 2
       else

test/logger/test_logdevice.rb

@@ -367,6 +367,49 @@ class TestLogDevice < Test::Unit::TestCase
 
   env_tz_works = /linux|darwin|freebsd/ =~ RUBY_PLATFORM # borrow from test/ruby/test_time_tz.rb
 
+  def test_shifting_weekly
+    Dir.mktmpdir do |tmpdir|
+      assert_in_out_err([{"TZ"=>"UTC"}, *%W"-rlogger -C#{tmpdir} -"], <<-'end;')
+        begin
+          module FakeTime
+            attr_accessor :now
+          end
+
+          class << Time
+            prepend FakeTime
+          end
+
+          log = "log"
+          File.open(log, "w") {}
+
+          Time.now = Time.utc(2015, 12, 14, 0, 1, 1)
+          dev = Logger::LogDevice.new("log", shift_age: 'weekly')
+
+          Time.now = Time.utc(2015, 12, 19, 12, 34, 56)
+          dev.write("#{Time.now} hello-1\n")
+          File.utime(Time.now, Time.now, log)
+
+          Time.now = Time.utc(2015, 12, 20, 0, 1, 1)
+          File.utime(Time.now, Time.now, log)
+          dev.write("#{Time.now} hello-2\n")
+        ensure
+          dev.close if dev
+        end
+      end;
+      log = File.join(tmpdir, "log")
+      cont = File.read(log)
+      assert_match(/hello-2/, cont)
+      assert_not_match(/hello-1/, cont)
+      log = Dir.glob(log+".*")
+      assert_equal(1, log.size)
+      log, = *log
+      cont = File.read(log)
+      assert_match(/hello-1/, cont)
+      assert_equal("2015-12-19", cont[/^[-\d]+/])
+      assert_equal("20151219", log[/\d+\z/])
+    end
+  end if env_tz_works
+
   def test_shifting_dst_change
     Dir.mktmpdir do |tmpdir|
       assert_in_out_err([{"TZ"=>"Europe/London"}, *%W"--disable=gems -rlogger -C#{tmpdir} -"], <<-'end;')