From e012957186426b9577bfc8498c5971990b258024 Mon Sep 17 00:00:00 2001
From: Colin Campbell <colin.campbell@ptfs-europe.com>
Date: Fri, 24 Jun 2011 14:28:22 +0100
Subject: [PATCH] Bug 5549 : Koha::Calendar::addDate should not loop on -1

Control variable of loop should be absolute value
to avoid looping when backtracking
---
 Koha/Calendar.pm | 3 ++-
 t/Kalendar.t     | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/Koha/Calendar.pm b/Koha/Calendar.pm
index bdd4b8f06a..a3ad60c994 100644
--- a/Koha/Calendar.pm
+++ b/Koha/Calendar.pm
@@ -87,6 +87,7 @@ sub addDate {
     if ( ref $add_duration ne 'DateTime::Duration' ) {
         $add_duration = DateTime::Duration->new( days => $add_duration );
     }
+    $unit ||= q{};    # default days ?
     my $days_mode = $self->{days_mode};
     Readonly::Scalar my $return_by_hour => 10;
     my $day_dur = DateTime::Duration->new( days => 1 );
@@ -114,7 +115,7 @@ sub addDate {
             }
 
         } else {
-            my $days = $add_duration->in_units('days');
+            my $days = abs $add_duration->in_units('days');
             while ($days) {
                 $base_date->add_duration($day_dur);
                 if ( $self->is_holiday($base_date) ) {
diff --git a/t/Kalendar.t b/t/Kalendar.t
index ef80ca929a..f955231264 100755
--- a/t/Kalendar.t
+++ b/t/Kalendar.t
@@ -5,7 +5,7 @@ use DateTime;
 use DateTime::TimeZone;
 
 use C4::Context;
-use Test::More tests => 8;    # last test to print
+use Test::More tests => 9;
 
 BEGIN { use_ok('Koha::Calendar'); }
 
@@ -57,3 +57,6 @@ is( $cal->is_holiday($notspecial), 0, 'open day test' );
 
 my $dt = $cal->addDate( $saturday, 1, 'days' );
 is( $dt->day_of_week, 1, 'addDate skips closed Sunday' );
+
+$dt = $cal->addDate( $bloomsday, -1 );
+cmp_ok( $dt->ymd(), 'cmp', '2011-06-15', 'Negative call to addDate' );
-- 
2.20.1