plugin_loader.py

import pkg_resources
import os
import glob
import inrospect
import sys
import re

class PluginLoader(object):
    """This is such a silly thing"""
    
    def __init__(self):                    
        for plugin_class in self._get_plugins():
            plugin_class(self).initialize()

    def _find_project_plugins(self):
        for dist in pkg_resources.working_set:
            for pkg_path in glob.glob(dist.location + os.sep + 'project*'):
                if os.path.exists(os.path.join(pkg_path, 'plugins')):
                    module_name = '.'.join([os.path.basename(pkg_path), 'plugins'])
                    try:
                        importlib.import_module(module_name)
                        yield sys.modules[module_name]
                    except IndexError:
                        pass

    def _get_plugins(self):
        modpat = re.compile('^project.*\.plugins\.(?!baseplugin)')
        clspat = re.compile('(?!Base).+Plugin$')
        for m in self._find_project_plugins():
            for mod in [x[1] for x in inspect.getmembers(m, inspect.ismodule) if modpat.match(x[1].__name__)]:
                for plugin in [x[1] for x in inspect.getmembers(mod, inspect.isclass) if clspat.match(x[0])]:
                    yield plugin