Enhancement - confirmation

- Added tri-state confirmation to append command.

src/command.cpp

@@ -872,6 +872,10 @@ std::string handleAppend ()
   std::vector <Task> all = tasks;
   context.filter.applySequence (tasks, context.sequence);
 
+  Permission permission;
+  if (context.sequence.size () > (size_t) context.config.get ("bulk", 2))
+    permission.bigSequence ();
+
   foreach (task, tasks)
   {
     foreach (other, all)
@@ -881,6 +885,8 @@ std::string handleAppend ()
            task->get ("parent") == other->get ("parent")) || // Sibling
           other->get ("uuid")   == task->get ("parent"))     // Parent
       {
+        Task before (*other);
+
         // A non-zero value forces a file write.
         int changes = 0;
 
@@ -889,7 +895,10 @@ std::string handleAppend ()
         changes += deltaTags (*other);
         changes += deltaAttributes (*other);
 
-        if (changes)
+        if (taskDiff (before, *other))
+        {
+          std::string question = taskDifferences (before, *other) + "Are you sure?";
+          if (changes && permission.confirmed (question))
           {
             context.tdb.update (*other);
 
@@ -899,12 +908,13 @@ std::string handleAppend ()
                   << "' to task "
                   << other->id
                   << std::endl;
-        }
 
             ++count;
           }
         }
       }
+    }
+  }
 
   context.tdb.commit ();
   context.tdb.unlock ();