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| Current File : //usr/lib/python3/dist-packages/uaclient/cli/parser.py |
import argparse
from collections import OrderedDict
from enum import Enum
from typing import List, NamedTuple # noqa: F401
from uaclient import messages
HelpEntry = NamedTuple(
"HelpEntry", [("position", int), ("name", str), ("help_string", str)]
)
class HelpCategory(Enum):
class _Value:
def __init__(self, code: str, msg: str):
self.code = code
self.msg = msg
QUICKSTART = _Value("quickstart", messages.CLI_HELP_HEADER_QUICK_START)
SECURITY = _Value("security", messages.CLI_HELP_HEADER_SECURITY)
TROUBLESHOOT = _Value(
"troubleshoot", messages.CLI_HELP_HEADER_TROUBLESHOOT
)
OTHER = _Value("other", messages.CLI_HELP_HEADER_OTHER)
FLAGS = _Value("flags", messages.CLI_FLAGS)
def __str__(self):
return self.value.code
@property
def header(self):
return self.value.msg
class ProArgumentParser(argparse.ArgumentParser):
help_entries = OrderedDict(
[
(HelpCategory.QUICKSTART, []),
(HelpCategory.SECURITY, []),
(HelpCategory.TROUBLESHOOT, []),
(HelpCategory.OTHER, []),
(HelpCategory.FLAGS, []),
]
) # type: OrderedDict[HelpCategory, List[HelpEntry]]
@classmethod
def add_help_entry(
cls,
category: HelpCategory,
name: str,
help_string: str,
position: int = 0,
):
cls.help_entries[category].append(
HelpEntry(position=position, name=name, help_string=help_string)
)
def __init__(self, *args, use_main_help: bool = True, **kwargs):
super().__init__(*args, **kwargs)
self.use_main_help = use_main_help
def print_help_for_command(self, command: str):
args_list = command.split()
args_list.append("--help")
try:
self.parse_args(args_list)
# We want help for any specific command,
# but without exiting right after
except SystemExit:
pass
def format_help(self):
if self.use_main_help:
return super().format_help()
help_output = self.format_usage()
for category, items in self.help_entries.items():
help_output += "\n"
help_output += "{}:".format(category.header)
help_output += "\n"
for item in sorted(items, key=lambda item: item.position):
help_output += "\n"
help_output += " {:<17}{}".format(item.name, item.help_string)
help_output += "\n"
if self.epilog:
help_output += "\n"
help_output += self.epilog
help_output += "\n"
return help_output
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