======
hupper
======

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``hupper`` is an integrated process monitor that will track changes to
any imported Python files in ``sys.modules`` as well as custom paths. When
files are changed the process is restarted.

Command-line Usage
==================

Hupper can load any Python code similar to ``python -m <module>`` by using the
``hupper -m <module>`` program.

.. code-block:: console

   $ hupper -m myapp
   Starting monitor for PID 23982.

API Usage
=========

Start by defining an entry point for your process. This must be an importable
path in string format. For example, ``myapp.scripts.serve.main``.

.. code-block:: python

    # myapp/scripts/serve.py

    import sys
    import hupper
    import waitress

    def wsgi_app(environ, start_response):
        start_response('200 OK', [('Content-Type', 'text/plain'])
        yield [b'hello']

    def main(args=sys.argv[1:]):
        if '--reload' in args:
            # start_reloader will only return in a monitored subprocess
            reloader = hupper.start_reloader('myapp.scripts.serve.main')

            # monitor an extra file
            reloader.watch_files(['foo.ini'])

        waitress.serve(wsgi_app)

Acknowledgments
===============

``hupper`` is inspired by initial work done by Carl J Meyer and David Glick
during a Pycon sprint and is built to be a more robust and generic version of
Ian Bicking's excellent PasteScript ``paste serve --reload`` and Pyramid's
``pserve --reload``.
