ConfigMan dependency solving

config-in-deps.py

"""Example app to understand how ConfigMan can find all the configuration keys
an application needs. """

from configman import ConfigurationManager, Namespace, RequiredConfig
from configman.converters import class_converter

class A(RequiredConfig):
    """Example class that can execute an action an has some required config."""
    required_config = Namespace()

    required_config.add_option('output',
                               'Beautiful output',
                               'the postgres database transaction source')

    def execute(self, config):
        print config.output


class B(RequiredConfig):
    """Example class that can execute an action an has some required config."""
    required_config = Namespace()

    required_config.add_option('output',
                               'Beautiful output',
                               'the postgres database transaction source')

    required_config.add_option('prefix',
                               'OUTPUT: ',
                               'the postgres database transaction source')

    def execute(self, config):
        print config.prefix, config.output

# Create a basic namespace to choose which class to use
definition = Namespace()
definition.add_option('application',
                      doc='the fully qualified module or class of the ',
                      default='A',
                      from_string_converter=class_converter,
                      short_form='a',
                     )

# Create the context
c = ConfigurationManager(definition,
                         app_name='demo1',
                         app_description=__doc__)

config = c.get_config()

# Instanciate the right class and execute it's action
app = config.application()
app.execute(config)