|
|
"""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
|
|
|
|
|
|
To see the command line option help, run this program from the command line::
|
|
|
|
|
|
$ python appconfig.py -h
|
|
|
|
|
|
To make one of your classes configurable (from the command line and config
|
|
|
files) inherit from Configurable and declare class attributes as traits (see
|
|
|
classes Foo and Bar below). To make the traits configurable, you will need
|
|
|
to set the following options:
|
|
|
|
|
|
* ``config``: set to ``True`` to make the attribute configurable.
|
|
|
* ``shortname``: by default, configurable attributes are set using the syntax
|
|
|
"Classname.attributename". At the command line, this is a bit verbose, so
|
|
|
we allow "shortnames" to be declared. Setting a shortname is optional, but
|
|
|
when you do this, you can set the option at the command line using the
|
|
|
syntax: "shortname=value".
|
|
|
* ``help``: set the help string to display a help message when the ``-h``
|
|
|
option is given at the command line. The help string should be valid ReST.
|
|
|
|
|
|
When the config attribute of an Application is updated, it will fire all of
|
|
|
the trait's events for all of the config=True attributes.
|
|
|
"""
|
|
|
|
|
|
from IPython.config.configurable import Configurable
|
|
|
from IPython.config.application import Application
|
|
|
from IPython.utils.traitlets import (
|
|
|
Bool, Unicode, Int, Float, List, Dict
|
|
|
)
|
|
|
|
|
|
|
|
|
class Foo(Configurable):
|
|
|
"""A class that has configurable, typed attributes.
|
|
|
|
|
|
"""
|
|
|
|
|
|
i = Int(0, config=True, help="The integer i.")
|
|
|
j = Int(1, config=True, help="The integer j.")
|
|
|
name = Unicode(u'Brian', config=True, help="First name.")
|
|
|
|
|
|
|
|
|
class Bar(Configurable):
|
|
|
|
|
|
enabled = Bool(True, config=True, help="Enable bar.")
|
|
|
|
|
|
|
|
|
class MyApp(Application):
|
|
|
|
|
|
name = Unicode(u'myapp')
|
|
|
running = Bool(False, config=True,
|
|
|
help="Is the app running?")
|
|
|
classes = List([Bar, Foo])
|
|
|
config_file = Unicode(u'', config=True,
|
|
|
help="Load this config file")
|
|
|
|
|
|
aliases = Dict(dict(i='Foo.i',j='Foo.j',name='Foo.name', running='MyApp.running',
|
|
|
enabled='Bar.enabled', log_level='MyApp.log_level'))
|
|
|
|
|
|
flags = Dict(dict(enable=({'Bar': {'enabled' : True}}, "Enable Bar"),
|
|
|
disable=({'Bar': {'enabled' : False}}, "Disable Bar"),
|
|
|
debug=({'MyApp':{'log_level':10}}, "Set loglevel to DEBUG")
|
|
|
))
|
|
|
|
|
|
def init_foo(self):
|
|
|
# Pass config to other classes for them to inherit the config.
|
|
|
self.foo = Foo(config=self.config)
|
|
|
|
|
|
def init_bar(self):
|
|
|
# Pass config to other classes for them to inherit the config.
|
|
|
self.bar = Bar(config=self.config)
|
|
|
|
|
|
def initialize(self, argv=None):
|
|
|
self.parse_command_line(argv)
|
|
|
if self.config_file:
|
|
|
self.load_config_file(self.config_file)
|
|
|
self.init_foo()
|
|
|
self.init_bar()
|
|
|
|
|
|
def start(self):
|
|
|
print("app.config:")
|
|
|
print(self.config)
|
|
|
|
|
|
|
|
|
def main():
|
|
|
app = MyApp()
|
|
|
app.initialize()
|
|
|
app.start()
|
|
|
|
|
|
|
|
|
if __name__ == "__main__":
|
|
|
main()
|
|
|
|
