Add directory_select to IDisplay interface

letsencrypt/interfaces.py

@@ -443,6 +443,20 @@ class IDisplay(zope.interface.Interface):
 
         """
 
+    def directory_select(self, message, default=None, cli_flag=None):
+        """Display a directory selection screen.
+
+        :param str message: prompt to give the user
+        :param default: the default value to return, if one exists, when
+            using the NoninteractiveDisplay
+        :param str cli_flag: option used to set this value with the CLI
+
+        :returns: tuple of the form (`code`, `string`) where
+            `code` - int display exit code
+            `string` - input entered by the user
+
+        """
+
 
 class IValidator(zope.interface.Interface):
     """Configuration validator."""