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import argparse
import sys
try:
import shtab
except ImportError:
pass
from .compat.py38 import files
class _MissingCompletionAction(argparse.Action):
def __call__(self, parser, namespace, values, option_string):
print("Install keyring[completion] for completion support.", file=sys.stderr)
parser.exit(1)
def add_completion_notice(parser):
"""Add completion argument to parser."""
parser.add_argument(
"--print-completion",
choices=["bash", "zsh", "tcsh"],
action=_MissingCompletionAction,
help="print shell completion script",
)
return parser
def get_action(parser, option):
(match,) = (action for action in parser._actions if option in action.option_strings)
return match
def install_completion(parser):
preamble = dict(
bash=files(__package__)
.joinpath('backend_complete.bash')
.read_text(encoding='utf-8'),
zsh=files(__package__)
.joinpath('backend_complete.zsh')
.read_text(encoding='utf-8'),
)
shtab.add_argument_to(parser, preamble=preamble)
get_action(parser, '--keyring-path').complete = shtab.DIR
get_action(parser, '--keyring-backend').complete = dict(
bash='_keyring_backends',
zsh='backend_complete',
)
return parser
def install(parser):
try:
install_completion(parser)
except NameError:
add_completion_notice(parser)
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