comparison mercurial/config.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

                self._data[s] = sortdict()
            self._data[s].update(src._data[s])
        self._source.update(src._source)
    def get(self, section, item, default=None):
        return self._data.get(section, {}).get(item, default)
    def source(self, section, item):
        return self._source.get((section, item), "")
    def sections(self):
        return sorted(self._data.keys())
    def items(self, section):

    def set(self, section, item, value, source=""):
        if section not in self:
            self._data[section] = sortdict()
        self._data[section][item] = value
        self._source[(section, item)] = source

    def parse(self, src, data, sections=None, remap=None, include=None):
        sectionre = re.compile(r'\[([^\[]+)\]')
        itemre = re.compile(r'([^=\s][^=]*?)\s*=\s*(.*\S|)')
        contre = re.compile(r'\s+(\S|\S.*\S)\s*$')

15919:69e792cf7851

                self._data[s] = sortdict()
            self._data[s].update(src._data[s])
        self._source.update(src._source)
    def get(self, section, item, default=None):
        return self._data.get(section, {}).get(item, default)

    def backup(self, section, item):
        """return a tuple allowing restore to reinstall a previous valuesi

        The main reason we need it is because it handle the "no data" case.
        """
        try:
            value = self._data[section][item]
            source = self.source(section, item)
            return (section, item, value, source)
        except KeyError:
            return (section, item)

    def source(self, section, item):
        return self._source.get((section, item), "")
    def sections(self):
        return sorted(self._data.keys())
    def items(self, section):

    def set(self, section, item, value, source=""):
        if section not in self:
            self._data[section] = sortdict()
        self._data[section][item] = value
        self._source[(section, item)] = source

    def restore(self, data):
        """restore data returned by self.backup"""
        if len(data) == 4:
            # restore old data
            section, item, value, source = data
            self._data[section][item] = value
            self._source[(section, item)] = source
        else:
            # no data before, remove everything
            section, item = data
            if section in self._data:
                del self._data[section][item]
            self._source.pop((section, item), None)

    def parse(self, src, data, sections=None, remap=None, include=None):
        sectionre = re.compile(r'\[([^\[]+)\]')
        itemre = re.compile(r'([^=\s][^=]*?)\s*=\s*(.*\S|)')
        contre = re.compile(r'\s+(\S|\S.*\S)\s*$')