added utils.pm with get_rd_week

5 files changed, 67 insertions, 6 deletions

diff --git a/MANIFEST b/MANIFEST
index cbe0e68..e553989 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -1,6 +1,7 @@
 ChangeLog
 lib/RHRD.pm
 lib/RHRD/rddb.pm
+lib/RHRD/utils.pm
 Makefile.PL
 MANIFEST
 META.yml
diff --git a/META.yml b/META.yml
index 5add8b0..8d1b6a6 100644
--- a/META.yml
+++ b/META.yml
@@ -20,4 +20,6 @@ no_index:
 requires:
   Config::IniFiles: '0'
   DBI: '0'
-version: '0.1'
+  DateTime: '0'
+  DateTime::TimeZone: '0'
+version: '0.2'
diff --git a/Makefile.PL b/Makefile.PL
index c9f1b5e..cceb48c 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -2,13 +2,15 @@ use ExtUtils::MakeMaker;
 use 5.004;
 
 WriteMakefile(
-	NAME	     => 'RHRD',
-	VERSION_FROM => 'lib/RHRD.pm',
+  NAME       => 'RHRD',
+  VERSION_FROM => 'lib/RHRD.pm',
   LICENSE => 'gpl_3',
   AUTHOR    => 'Christian Pointner <equinox@helsinki.at>',
   ABSTRACT  => 'Radio Helsinki Rivendell libraries and utils',
   PREREQ_PM => {
-		"Config::IniFiles" => 0,
-		"DBI" => 0
+    "Config::IniFiles" => 0,
+    "DBI" => 0,
+    "DateTime" => 0,
+    "DateTime::TimeZone" => 0
   },
 );
diff --git a/lib/RHRD.pm b/lib/RHRD.pm
index dce995f..859641f 100644
--- a/lib/RHRD.pm
+++ b/lib/RHRD.pm
@@ -26,6 +26,6 @@ use strict;
 use vars qw($VERSION);
 use 5.004;
 
-$VERSION = "0.1"
+$VERSION = "0.2"
 
 ##########################################################################
diff --git a/lib/RHRD/utils.pm b/lib/RHRD/utils.pm
new file mode 100755
index 0000000..3a49ebb
--- /dev/null
+++ b/lib/RHRD/utils.pm
@@ -0,0 +1,56 @@
+# rddb.pm
+#
+#  rhrdlibs
+#
+#  Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
+#
+#  This file is part of rhrdlibs.
+#
+#  rhrdlibs is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU Affero General Public License as published by
+#  the Free Software Foundation, either version 3 of the License, or
+#  any later version.
+#
+#  rhrdlibs is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU Affero General Public License for more details.
+#
+#  You should have received a copy of the GNU Affero General Public License
+#  along with rhrdlibs. If not, see <http://www.gnu.org/licenses/>.
+#
+
+package RHRD::rddb;
+
+use strict;
+use DateTime;
+use DateTime::TimeZone;
+
+sub get_rd_week
+{
+  #
+  # This computes the current Rivendell Week based on the number
+  # of weeks since epoch.
+  #
+  # Explanation:
+  #  epoch was at 01.01.1970 which was a Thursday.
+  #  Monday in that week is (s-from-epoch + 3*24*60*60) seconds ago.
+  #  This needs to be adjusted by the timezone offset for Europe/Vienna
+  #  which is of course not constant (damn you daylight savings time)
+  #  Divide this by (7*24*60*60) and you get the number of
+  #  weeks since the Monday in the week of epoch adjusted for timezone offsets.
+  #  This week had week number 3 so add an offset of 2 and
+  #  get the modulo of 4. This rounded down gives you the current week
+  #  with 0 meaning Week 1. So add 1 to that number and you will get
+  #  the current RD week.
+  #
+  my $now = DateTime->now();
+  my $tz = DateTime::TimeZone->new(name => 'Europe/Vienna');
+  my $tz_offset = $tz->offset_for_datetime($now);
+  my $sEpoch = $now->epoch() + $tz_offset;
+  my $week = floor(((($sEpoch + 259200)/604800) + 2) % 4) + 1;
+
+  return $week;
+}
+
+return 1;