Bug Fix - #260

- Fixed bug whereby the start, stop and delete commands were not
  complaining when filter arguments were specified, even though they
  were ignored.  Thanks to Charles T. Yun.

src/Context.cpp

@@ -316,6 +316,18 @@ std::string Context::canonicalize (const std::string& input) const
   return canonical;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+void Context::disallowModification () const
+{
+  if (task.size ()         ||
+      subst.mFrom != ""    ||
+      tagAdditions.size () ||
+      tagRemovals.size ())
+    throw std::string ("The '")
+        + cmd.command
+        + "' command does not allow further modification of a task.";
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void Context::loadCorrectConfigFile ()
 {