"""A simple example of how to use IPython.config.application.Application.

This should serve as a simple example that shows how the IPython config
system works. The main classes are:

* IPython.config.configurable.Configurable
* IPython.config.configurable.SingletonConfigurable
* IPython.config.loader.Config
* IPython.config.application.Application
"""

import sys

from IPython.config.configurable import Configurable
from IPython.config.application import Application
from IPython.utils.traitlets import (
    Bool, Unicode, Int, Float, List
)

class Foo(Configurable):

    i = Int(0, config=True, shortname='i', help="The integer i.")
    j = Int(1, config=True, shortname='j', help="The integer j.")
    name = Unicode(u'Brian', config=True, shortname='name', help="First name.")


class Bar(Configurable):

    enabled = Bool(True, config=True, shortname="enabled", help="Enable bar.")


class MyApp(Application):

    app_name = Unicode(u'myapp')
    running = Bool(False, config=True, shortname="running",
                   help="Is the app running?")
    classes = List([Bar, Foo])
    config_file = Unicode(u'', config=True, shortname="config_file",
                   help="Load this config file")

    def init_foo(self):
        self.foo = Foo(config=self.config)

    def init_bar(self):
        self.bar = Bar(config=self.config)



def main():
    app = MyApp()
    app.parse_command_line()
    if app.config_file:
        app.load_config_file(app.config_file)
    app.init_foo()
    app.init_bar()
    print "app.config:"
    print app.config


if __name__ == "__main__":
    main()