TDB2

- Verifies that a UUID is not already found in the data.  This prevents
  erroneous double-import.  Or triple...

src/TDB2.cpp

@@ -385,6 +385,11 @@ void TDB2::add (const Task& task)
 {
 //  std::cout << "# TDB2::add\n";
 
+  // If the tasks are loaded, then verify that this uuid is not already in
+  // the file.
+  if (!verifyUniqueUUID (task.get ("uuid")))
+    throw format ("Cannot add task because the uuid '{1}' is not unique.", task.get ("uuid"));
+
   std::string status = task.get ("status");
   if (status == "completed" ||
       status == "deleted")
@@ -485,6 +490,16 @@ int TDB2::next_id ()
   return _id++;
 }
 
+////////////////////////////////////////////////////////////////////////////////
+bool TDB2::verifyUniqueUUID (const std::string& uuid)
+{
+  if (pending.id (uuid) != 0 ||
+      completed.id (uuid) != 0)
+    return false;
+
+  return true;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 //
 //  File           RW State Tasks + - ~ lines + - Bytes

src/TDB2.h

@@ -99,6 +99,9 @@ public:
   void dump ();
   void dump_file (ViewText&, const std::string&, TF2&);
 
+private:
+  bool verifyUniqueUUID (const std::string&);
+
 public:
   TF2 pending;
   TF2 completed;