Feature - Special tags

- Implemented the 'nonag' tag that prevents nag messages for a task.

ChangeLog

@@ -10,6 +10,8 @@
  + Added feature #341 that makes explicit references to the task and taskrc
    man pages, both in the auto-generated .taskrc file and the version command
    output (thanks to Cory Donnelly).
+ + Added special 'nonag' tag that suppresses nag messages for a task.
+ + Added special 'nocolor' tag that suppresses colorization rules for a task.
  + Fixed bug that showed a calendar for the year 2037 when 'task calendar due'
    was run, and there are no tasks with due dates.
  + Fixed bug #316 which caused the timesheet report to display an oddly sorted

src/recur.cpp

@@ -399,8 +399,15 @@ int getDueState (const std::string& due)
 }
 
 ////////////////////////////////////////////////////////////////////////////////
+// Returns a Boolean indicator as to whether a nag message was generated, so
+// that commands can control the number of nag messages displayed (ie one is
+// enough).
 bool nag (Task& task)
 {
+  // Special tag overrides nagging.
+  if (task.hasTag ("nonag"))
+    return false;
+
   std::string nagMessage = context.config.get ("nag", "");
   if (nagMessage != "")
   {