Process local commands

def _local(self, args):
        '''
        Process local commands
        '''
        args.pop(0)
        command = args[0]
        if command == 'install':
            self._local_install(args)
        elif command == 'files':
            self._local_list_files(args)
        elif command == 'info':
            self._local_info(args)
        else:
            raise SPMInvocationError('Invalid local command \'{0}\''.format(command))