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# Copyright 2016-2018 Dirk Thomas
# Licensed under the Apache License, Version 2.0
from colcon_core.extension_point import EXTENSION_POINT_GROUP_NAME
from colcon_core.extension_point import get_extension_points
from colcon_core.extension_point import load_extension_point
from colcon_core.plugin_system import get_first_line_doc
from colcon_core.plugin_system import satisfies_version
from colcon_core.verb import VerbExtensionPoint
class ExtensionPointsVerb(VerbExtensionPoint):
"""List extension points."""
def __init__(self): # noqa: D107
super().__init__()
satisfies_version(VerbExtensionPoint.EXTENSION_POINT_VERSION, '^1.0')
def add_arguments(self, *, parser): # noqa: D102
parser.add_argument(
'--all', '-a',
action='store_true',
default=False,
help='Also show extension points which failed to be imported. '
'(prefixed with `- `)')
parser.add_argument(
'--verbose', '-v',
action='store_true',
default=False,
help='Show more information for each extension point')
def main(self, *, context): # noqa: D102
colcon_extension_points = get_extension_points(
EXTENSION_POINT_GROUP_NAME)
for name in sorted(colcon_extension_points.keys()):
# skip "private" extension points
if name.startswith('_'):
continue
self._print_extension_point(
context.args, name, colcon_extension_points[name],
EXTENSION_POINT_GROUP_NAME)
def _print_extension_point(self, args, name, value, group):
exception = None
try:
extension_point = load_extension_point(name, value, group)
except Exception as e: # noqa: B902
# catch exceptions raised when loading entry point
if not args.all:
# skip entry points which failed to load
return
exception = e
extension_point = None
prefix = '' if exception is None else '- '
print(prefix + name + ':', get_first_line_doc(extension_point))
if args.verbose:
if ':' in value:
module_name, attr = value.split(':', 1)
else:
module_name, attr = value, None
print(prefix, ' ', 'module_name:', module_name)
if attr is not None:
print(prefix, ' ', 'attributes:', attr)
if hasattr(extension_point, 'EXTENSION_POINT_VERSION'):
print(
prefix, ' ', 'version:',
extension_point.EXTENSION_POINT_VERSION)
if exception:
print(prefix, ' ', 'reason:', str(exception))
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