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88 lines
2.6 KiB
Python
88 lines
2.6 KiB
Python
2 years ago
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"""A single place for constructing and exposing the main parser
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"""
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import os
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import sys
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from typing import List, Tuple
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from pip._internal.cli import cmdoptions
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from pip._internal.cli.parser import ConfigOptionParser, UpdatingDefaultsHelpFormatter
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from pip._internal.commands import commands_dict, get_similar_commands
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from pip._internal.exceptions import CommandError
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from pip._internal.utils.misc import get_pip_version, get_prog
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__all__ = ["create_main_parser", "parse_command"]
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def create_main_parser() -> ConfigOptionParser:
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"""Creates and returns the main parser for pip's CLI"""
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parser = ConfigOptionParser(
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usage="\n%prog <command> [options]",
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add_help_option=False,
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formatter=UpdatingDefaultsHelpFormatter(),
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name="global",
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prog=get_prog(),
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)
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parser.disable_interspersed_args()
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parser.version = get_pip_version()
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# add the general options
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gen_opts = cmdoptions.make_option_group(cmdoptions.general_group, parser)
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parser.add_option_group(gen_opts)
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# so the help formatter knows
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parser.main = True # type: ignore
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# create command listing for description
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description = [""] + [
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f"{name:27} {command_info.summary}"
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for name, command_info in commands_dict.items()
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]
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parser.description = "\n".join(description)
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return parser
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def parse_command(args: List[str]) -> Tuple[str, List[str]]:
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parser = create_main_parser()
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# Note: parser calls disable_interspersed_args(), so the result of this
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# call is to split the initial args into the general options before the
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# subcommand and everything else.
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# For example:
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# args: ['--timeout=5', 'install', '--user', 'INITools']
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# general_options: ['--timeout==5']
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# args_else: ['install', '--user', 'INITools']
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general_options, args_else = parser.parse_args(args)
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# --version
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if general_options.version:
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sys.stdout.write(parser.version)
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sys.stdout.write(os.linesep)
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sys.exit()
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# pip || pip help -> print_help()
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if not args_else or (args_else[0] == "help" and len(args_else) == 1):
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parser.print_help()
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sys.exit()
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# the subcommand name
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cmd_name = args_else[0]
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if cmd_name not in commands_dict:
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guess = get_similar_commands(cmd_name)
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msg = [f'unknown command "{cmd_name}"']
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if guess:
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msg.append(f'maybe you meant "{guess}"')
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raise CommandError(" - ".join(msg))
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# all the args without the subcommand
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cmd_args = args[:]
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cmd_args.remove(cmd_name)
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return cmd_name, cmd_args
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