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"""
The standard parser used by cmd2 built-in commands is Cmd2ArgumentParser.
The following code shows how to override it with your own parser class.
"""
import sys
from typing import NoReturn
from cmd2 import (
Cmd2ArgumentParser,
cmd2,
set_default_argument_parser_type,
styles,
stylize,
)
# Since built-in commands rely on customizations made in Cmd2ArgumentParser,
# your custom parser class should inherit from Cmd2ArgumentParser.
class CustomParser(Cmd2ArgumentParser):
"""Overrides error method."""
def __init__(self, *args, **kwargs) -> None: # type: ignore[no-untyped-def]
super().__init__(*args, **kwargs)
def error(self, message: str) -> NoReturn:
"""Custom override that applies custom formatting to the error message."""
lines = message.split('\n')
formatted_message = ''
for linum, line in enumerate(lines):
if linum == 0:
formatted_message = 'Error: ' + line
else:
formatted_message += '\n ' + line
self.print_usage(sys.stderr)
# Format errors with warning style
formatted_message = stylize(
formatted_message,
style=styles.WARNING,
)
self.exit(2, f'{formatted_message}\n\n')
if __name__ == '__main__':
import sys
# Set the default parser type before instantiating app.
set_default_argument_parser_type(CustomParser)
app = cmd2.Cmd(include_ipy=True, persistent_history_file='cmd2_history.dat')
app.self_in_py = True # Enable access to "self" within the py command
app.debug = True # Show traceback if/when an exception occurs
sys.exit(app.cmdloop())
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