Adding configuration file and value check module.

__version__ = '0.0.1'

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import os

from pathlib import Path

try:

    from ConfigParser import ConfigParser

except ImportError:

    from configparser import ConfigParser

import checkvalue as cv

"""

Module for resolving configuation variables of PyGriffin

"""

class PyGriffinConfigParser():

    """

    Class to manage PyGriffin's configuration

    Parameters

    ----------

    griffin_path : str (default None)

        Path to the Griffin executable

    """

    __MOD_PATH = os.path.abspath(os.path.dirname(__file__))

    __RC_FILE = __MOD_PATH + '/.pygriffin.rc'

    def __init__(self, griffin_exec=None):

        # always read the config file,

        # even if we don't use it

        self.__config = ConfigParser()

        self.__config.read(self.__RC_FILE)

        # if the Griffin path parameter is set, use that

        if griffin_exec is not None:

            self.griffin_exec = griffin_exec

        # next, try the GRIFFFIN_EXEC environment variable

        elif os.getenv('GRIFFIN_EXEC') is not None:

            self.griffin_dir = os.getenv('GRIFFIN_EXEC')

        elif self.get('griffin_exec'):

            self.griffin_exec = self.get('griffin_exec')

        else:

            msg = ('All methods of determining the location '

            'of the Griffin executable have failed.')

            raise RuntimeError(msg)

    def get(self, *args, **kwargs):

        """

        Attempts to get a configuration option from the .rc file.

        If an exeption is raised, the provided default value will be returned.

        If no default value is provided, None is returned.

        """

        default_val = kwargs.pop('default', None)

        if self.__config.has_option(*args, **kwargs):

            return self.__config.get(*args, **kwargs)

        else:

            return default_val

    @property

    def griffin_dir(self):

        return self.griffin_exec.parent

    @property

    def griffin_exec(self):

        return self._griffin_exec

    @griffin_exec.setter

    def griffin_exec(self, exec):

        cv.check_type('Griffin executable path', exec, (Path, str))

        self._griffin_exec = Path(exec).absolute()

    @property

    def module_path(self):

        return config.__MOD_PATH

    @property

    def rc_file(self):

        return self.__RC_FILE

# this is provided by importing this file elsewhere

PyGriffinConfig = PyGriffinConfig()

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