"""

:organization: Logilab

:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

import sys

from cubicweb import warning

def lines(path, comments=None):

    result = []

    for line in open(path, 'U'):

        line = line.strip()

        if line and (comments is None or not line.startswith(comments)):

            result.append(line)

    return result

def read_config(config_file):

    """read the instance configuration from a file and return it as a

    dictionnary

    :type config_file: str

    :param config_file: path to the configuration file

    :rtype: dict

    :return: a dictionary with specified values associated to option names

    """

    config = current = {}

    try:

        for line in lines(config_file, comments='#'):

            try:

                option, value = line.split('=', 1)

            except ValueError:

                option = line.strip().lower()

                if option[0] == '[':

                    # start a section

                    section = option[1:-1]

                    assert not config.has_key(section), \

                           'Section %s is defined more than once' % section

                    config[section] = current = {}

                    continue

                print >> sys.stderr, 'ignoring malformed line\n%r' % line

                continue

            option = option.strip().replace(' ', '_')

            value = value.strip()

            current[option] = value or None

    except IOError, ex:

        warning('missing or non readable configuration file %s (%s)',

                config_file, ex)

    return config

def env_path(env_var, default, name):

    return default

def create_dir(*args):

    raise RuntimeError()