Dynamically detect check against modes

from archversion.error import InvalidConfigFile, VersionNotFound

from collections import OrderedDict

from urllib.request import urlopen, Request

import fnmatch

import json

import logging

import os

            cache = {}

        self.cache = cache

        # populate compare table

        # need to be done manually to avoid get_upstream to be in

        self.compare_table = {

            "pacman": self.get_version_pacman,

            "archweb": self.get_version_archweb,

            "aur": self.get_version_aur,

            "abs": self.get_version_abs,

            "cache": self.get_version_cache,

            "none": self.get_version_none

            }

        self.compare_table = {}

        for mode in fnmatch.filter(dir(self), "get_version_*"):

            # we ignore get_version_upstream

            # because we get mode to check against it

            if mode == "get_version_upstream":

                continue

            self.compare_table[mode[12:]] = getattr(self, mode)

    def reduce_packages(self, packages):

        '''Keep only the give packages list'''