check if ID is already in use when creating new IDs

apps/opencs/model/world/data.cpp

@@ -394,4 +394,22 @@ void CSMWorld::Data::loadFile (const boost::filesystem::path& path, bool base)
                 reader.skipRecord();
         }
     }
-}
+}
+
+bool CSMWorld::Data::hasId (const std::string& id) const
+{
+    return
+        getGlobals().searchId (id)!=-1 ||
+        getGmsts().searchId (id)!=-1 ||
+        getSkills().searchId (id)!=-1 ||
+        getClasses().searchId (id)!=-1 ||
+        getFactions().searchId (id)!=-1 ||
+        getRaces().searchId (id)!=-1 ||
+        getSounds().searchId (id)!=-1 ||
+        getScripts().searchId (id)!=-1 ||
+        getRegions().searchId (id)!=-1 ||
+        getBirthsigns().searchId (id)!=-1 ||
+        getSpells().searchId (id)!=-1 ||
+        getCells().searchId (id)!=-1 ||
+        getReferenceables().searchId (id)!=-1;
+}

apps/opencs/model/world/data.hpp

@@ -123,6 +123,8 @@ namespace CSMWorld
 
             void loadFile (const boost::filesystem::path& path, bool base);
             ///< Merging content of a file into base or modified.
+
+            bool hasId (const std::string& id) const;
     };
 }
 

apps/opencs/view/world/genericcreator.cpp

@@ -68,9 +68,9 @@ std::string CSVWorld::GenericCreator::getErrors() const
     {
         errors = "Missing ID";
     }
-    else
+    else if (mData.hasId (id))
     {
-
+        errors = "ID is already in use";
     }
 
     return errors;