comparison mercurial/ui.py @ 15919:69e792cf7851

config: have a way to backup and restore value in config

This is introduce to allow temporary overwriting of a config value while being
able to reinstall the old value once done. The main advantage over using
``config`` and ``setconfig`` is that backup and restore will properly restore
the lack of any config. Restoring the fact that there was no value is important
to allow config user to keep using meaniful default value.

A more naive approach will result in the following scenario::

  Before:
    config(section, item, my_default) --> my_default

  temporal overwrite
    old = config(section, item)
    …
    setconfig(section, item, old)

  After
    config(section, item, my_default) --> None

The first user of this feature should be mq to overwriting minimal phase of
future commit.

15918:4f9853e7f690

        if section in (None, 'trusted'):
            # update trust information
            self._trustusers.update(self.configlist('trusted', 'users'))
            self._trustgroups.update(self.configlist('trusted', 'groups'))

    def setconfig(self, section, name, value, overlay=True):
        if overlay:
            self._ocfg.set(section, name, value)
        self._tcfg.set(section, name, value)

15919:69e792cf7851

        if section in (None, 'trusted'):
            # update trust information
            self._trustusers.update(self.configlist('trusted', 'users'))
            self._trustgroups.update(self.configlist('trusted', 'groups'))

    def backupconfig(self, section, item):
        return (self._ocfg.backup(section, item),
                self._tcfg.backup(section, item),
                self._ucfg.backup(section, item),)
    def restoreconfig(self, data):
        self._ocfg.restore(data[0])
        self._tcfg.restore(data[1])
        self._ucfg.restore(data[2])

    def setconfig(self, section, name, value, overlay=True):
        if overlay:
            self._ocfg.set(section, name, value)
        self._tcfg.set(section, name, value)