forked from github/pelican
85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
import importlib
|
|
import importlib.machinery
|
|
import importlib.util
|
|
import logging
|
|
import pkgutil
|
|
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
def iter_namespace(ns_pkg):
|
|
# Specifying the second argument (prefix) to iter_modules makes the
|
|
# returned name an absolute name instead of a relative one. This allows
|
|
# import_module to work without having to do additional modification to
|
|
# the name.
|
|
return pkgutil.iter_modules(ns_pkg.__path__, ns_pkg.__name__ + ".")
|
|
|
|
|
|
def get_namespace_plugins(ns_pkg=None):
|
|
if ns_pkg is None:
|
|
import pelican.plugins as ns_pkg
|
|
|
|
return {
|
|
name: importlib.import_module(name)
|
|
for finder, name, ispkg
|
|
in iter_namespace(ns_pkg)
|
|
if ispkg
|
|
}
|
|
|
|
|
|
def list_plugins(ns_pkg=None):
|
|
from pelican.log import init as init_logging
|
|
init_logging(logging.INFO)
|
|
ns_plugins = get_namespace_plugins(ns_pkg)
|
|
if ns_plugins:
|
|
logger.info('Plugins found:\n' + '\n'.join(ns_plugins))
|
|
else:
|
|
logger.info('No plugins are installed')
|
|
|
|
|
|
def load_legacy_plugin(plugin, plugin_paths):
|
|
# Try to find plugin in PLUGIN_PATHS
|
|
spec = importlib.machinery.PathFinder.find_spec(plugin, plugin_paths)
|
|
if spec is None:
|
|
# If failed, try to find it in normal importable locations
|
|
spec = importlib.util.find_spec(plugin)
|
|
if spec is None:
|
|
raise ImportError('Cannot import plugin `{}`'.format(plugin))
|
|
else:
|
|
mod = importlib.util.module_from_spec(spec)
|
|
spec.loader.exec_module(mod)
|
|
return mod
|
|
|
|
|
|
def load_plugins(settings):
|
|
logger.debug('Finding namespace plugins')
|
|
namespace_plugins = get_namespace_plugins()
|
|
if namespace_plugins:
|
|
logger.debug('Namespace plugins found:\n' +
|
|
'\n'.join(namespace_plugins))
|
|
plugins = []
|
|
if settings.get('PLUGINS') is not None:
|
|
for plugin in settings['PLUGINS']:
|
|
if isinstance(plugin, str):
|
|
logger.debug('Loading plugin `%s`', plugin)
|
|
# try to find in namespace plugins
|
|
if plugin in namespace_plugins:
|
|
plugin = namespace_plugins[plugin]
|
|
elif 'pelican.plugins.{}'.format(plugin) in namespace_plugins:
|
|
plugin = namespace_plugins['pelican.plugins.{}'.format(
|
|
plugin)]
|
|
# try to import it
|
|
else:
|
|
try:
|
|
plugin = load_legacy_plugin(
|
|
plugin,
|
|
settings.get('PLUGIN_PATHS', []))
|
|
except ImportError as e:
|
|
logger.error('Cannot load plugin `%s`\n%s', plugin, e)
|
|
continue
|
|
plugins.append(plugin)
|
|
else:
|
|
plugins = list(namespace_plugins.values())
|
|
|
|
return plugins
|