# configwarn.py - warn unsupported user configs
#
# Copyright 2017 Facebook, Inc.
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

"""warn unsupported user configs

Config::

    [configwarn]
    # Config names that are supposed to be set by system config and not
    # overrided by user config.
    systemconfigs = diff.git, extensions.hggit
"""

from __future__ import absolute_import

from mercurial.i18n import _
from mercurial import (
    rcutil,
    registrar,
)

configtable = {}
configitem = registrar.configitem(configtable)

configitem('configwarn', 'systemconfigs', default=[])

def reposetup(ui, repo):
    # use reposetup, not uisetup to work better with chg and it checks reporc.
    if not repo.local():
        return

    nonsystempaths = set(rcutil.userrcpath() + [repo.vfs.join('hgrc')])
    systemconfigs = ui.configlist('configwarn', 'systemconfigs')

    for configname in systemconfigs:
        if '.' not in configname:
            continue

        section, name = configname.split('.', 1)
        source = ui.configsource(section, name)

        if ':' not in source:
            continue

        path, lineno = source.split(':', 1)
        if path in nonsystempaths and lineno.isdigit():
            ui.warn(_('warning: overriding config %s is unsupported (hint: '
                      'remove line %s from %s to resolve this issue)\n')
                    % (configname, lineno, path))