Bug Fix - #327 Deleting due date on recurring task wraps to 1969

- Task now prevents removal of either a due date or a recurrence
  from a recurring task.

ChangeLog

@@ -7,6 +7,8 @@
    changes.  Now task asks "Proceed with change? (Yes/no/all/quit)".
  + Fixed bug #321 where all shell input was converted to lower case (thanks
    to Juergen Daubert).
+ + Fixed bug #327 that allowed the removal of a due date from a recurring
+   task.
 
 ------ old releases ------------------------------
 

src/command.cpp

@@ -950,6 +950,15 @@ int handleModify (std::string &outs)
         !task->has ("recur"))
       throw std::string ("You cannot specify an until date for a non-recurring task.");
 
+    if (task->has ("due")         &&
+        !context.task.has ("due") &&
+        context.task.has ("recur"))
+      throw std::string ("You cannot remove the due date from a recurring task.");
+
+    if (task->has ("recur") &&
+        !context.task.has ("recur"))
+      throw std::string ("You cannot remove the recurrence from a recurring task.");
+
     // Make all changes.
     foreach (other, all)
     {

src/tests/bug.327.t

@@ -0,0 +1,66 @@
+#! /usr/bin/perl
+################################################################################
+## task - a command line task list manager.
+##
+## Copyright 2006 - 2009, Paul Beckingham.
+## All rights reserved.
+##
+## This program is free software; you can redistribute it and/or modify it under
+## the terms of the GNU General Public License as published by the Free Software
+## Foundation; either version 2 of the License, or (at your option) any later
+## version.
+##
+## This program 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 General Public License for more
+## details.
+##
+## You should have received a copy of the GNU General Public License along with
+## this program; if not, write to the
+##
+##     Free Software Foundation, Inc.,
+##     51 Franklin Street, Fifth Floor,
+##     Boston, MA
+##     02110-1301
+##     USA
+##
+################################################################################
+
+use strict;
+use warnings;
+use Test::More tests => 6;
+
+# Create the rc file.
+if (open my $fh, '>', 'bug.rc')
+{
+  print $fh "data.location=.\n",
+            "confirmation=no\n";
+  close $fh;
+  ok (-r 'bug.rc', 'Created bug.rc');
+}
+
+# Setup: Add a recurring task then remove the due date.
+qx{../task rc:bug.rc add foo recur:yearly due:eoy};
+qx{../task rc:bug.rc li};
+qx{../task rc:bug.rc 2 due:};
+
+# Result: Somehow the due date is incremented and wraps around to 12/31/1969,
+# then keeps going back to today.
+my $output = qx{../task rc:bug.rc li};
+like ($output, qr/^1 task$/ms, 'Should only be one task');
+
+# Cleanup.
+unlink 'pending.data';
+ok (!-r 'pending.data', 'Removed pending.data');
+
+unlink 'completed.data';
+ok (!-r 'completed.data', 'Removed completed.data');
+
+unlink 'undo.data';
+ok (!-r 'undo.data', 'Removed undo.data');
+
+unlink 'bug.rc';
+ok (!-r 'bug.rc', 'Removed bug.rc');
+
+exit 0;
+