update.py 文件源码

def get_desktop(self, key, translated=True):
        " get generic option under 'Desktop Entry'"
        # never translate the pkgname
        if key == "X-AppInstall-Package":
            return self.get(self.DE, key)
        # shortcut
        if not translated:
            return self.get(self.DE, key)
        # first try dgettext
        if self.has_option_desktop("X-Ubuntu-Gettext-Domain"):
            value = self.get(self.DE, key)
            if value:
                domain = self.get(self.DE, "X-Ubuntu-Gettext-Domain")
                translated_value = gettext.dgettext(domain, value)
                if value != translated_value:
                    return translated_value
        # then try app-install-data
        value = self.get(self.DE, key)
        if value:
            translated_value = gettext.dgettext("app-install-data", value)
            if value != translated_value:
                return translated_value
        # then try the i18n version of the key (in [de_DE] or
        # [de]) but ignore errors and return the untranslated one then
        try:
            locale = getdefaultlocale(('LANGUAGE', 'LANG', 'LC_CTYPE',
                'LC_ALL'))[0]
            if locale:
                if self.has_option_desktop("%s[%s]" % (key, locale)):
                    return self.get(self.DE, "%s[%s]" % (key, locale))
                if "_" in locale:
                    locale_short = locale.split("_")[0]
                    if self.has_option_desktop("%s[%s]" % (key, locale_short)):
                        return self.get(self.DE, "%s[%s]" %
                            (key, locale_short))
        except ValueError:
            pass
        # and then the untranslated field
        return self.get(self.DE, key)