public void startTemplateWithPrefix(
     final Editor editor,
     final TemplateImpl template,
     final int templateStart,
     @Nullable final PairProcessor<String, String> processor,
     @Nullable final String argument) {
   final int caretOffset = editor.getCaretModel().getOffset();
   final TemplateState templateState = initTemplateState(editor);
   CommandProcessor commandProcessor = CommandProcessor.getInstance();
   commandProcessor.executeCommand(
       myProject,
       () -> {
         editor.getDocument().deleteString(templateStart, caretOffset);
         editor.getCaretModel().moveToOffset(templateStart);
         editor.getScrollingModel().scrollToCaret(ScrollType.RELATIVE);
         editor.getSelectionModel().removeSelection();
         Map<String, String> predefinedVarValues = null;
         if (argument != null) {
           predefinedVarValues = new HashMap<String, String>();
           predefinedVarValues.put(TemplateImpl.ARG, argument);
         }
         templateState.start(template, processor, predefinedVarValues);
       },
       CodeInsightBundle.message("insert.code.template.command"),
       null);
 }
 private static <T, U> void addToMap(
     @NotNull Map<T, U> map, @NotNull Collection<? extends T> keys, U value) {
   for (T key : keys) {
     map.put(key, value);
   }
 }