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| """A single place for constructing and exposing the main parser | |
| """ | |
| import os | |
| import subprocess | |
| import sys | |
| from typing import List, Optional, Tuple | |
| from pip._internal.build_env import get_runnable_pip | |
| from pip._internal.cli import cmdoptions | |
| from pip._internal.cli.parser import ConfigOptionParser, UpdatingDefaultsHelpFormatter | |
| from pip._internal.commands import commands_dict, get_similar_commands | |
| from pip._internal.exceptions import CommandError | |
| from pip._internal.utils.misc import get_pip_version, get_prog | |
| __all__ = ["create_main_parser", "parse_command"] | |
| def create_main_parser() -> ConfigOptionParser: | |
| """Creates and returns the main parser for pip's CLI""" | |
| parser = ConfigOptionParser( | |
| usage="\n%prog <command> [options]", | |
| add_help_option=False, | |
| formatter=UpdatingDefaultsHelpFormatter(), | |
| name="global", | |
| prog=get_prog(), | |
| ) | |
| parser.disable_interspersed_args() | |
| parser.version = get_pip_version() | |
| # add the general options | |
| gen_opts = cmdoptions.make_option_group(cmdoptions.general_group, parser) | |
| parser.add_option_group(gen_opts) | |
| # so the help formatter knows | |
| parser.main = True # type: ignore | |
| # create command listing for description | |
| description = [""] + [ | |
| f"{name:27} {command_info.summary}" | |
| for name, command_info in commands_dict.items() | |
| ] | |
| parser.description = "\n".join(description) | |
| return parser | |
| def identify_python_interpreter(python: str) -> Optional[str]: | |
| # If the named file exists, use it. | |
| # If it's a directory, assume it's a virtual environment and | |
| # look for the environment's Python executable. | |
| if os.path.exists(python): | |
| if os.path.isdir(python): | |
| # bin/python for Unix, Scripts/python.exe for Windows | |
| # Try both in case of odd cases like cygwin. | |
| for exe in ("bin/python", "Scripts/python.exe"): | |
| py = os.path.join(python, exe) | |
| if os.path.exists(py): | |
| return py | |
| else: | |
| return python | |
| # Could not find the interpreter specified | |
| return None | |
| def parse_command(args: List[str]) -> Tuple[str, List[str]]: | |
| parser = create_main_parser() | |
| # Note: parser calls disable_interspersed_args(), so the result of this | |
| # call is to split the initial args into the general options before the | |
| # subcommand and everything else. | |
| # For example: | |
| # args: ['--timeout=5', 'install', '--user', 'INITools'] | |
| # general_options: ['--timeout==5'] | |
| # args_else: ['install', '--user', 'INITools'] | |
| general_options, args_else = parser.parse_args(args) | |
| # --python | |
| if general_options.python and "_PIP_RUNNING_IN_SUBPROCESS" not in os.environ: | |
| # Re-invoke pip using the specified Python interpreter | |
| interpreter = identify_python_interpreter(general_options.python) | |
| if interpreter is None: | |
| raise CommandError( | |
| f"Could not locate Python interpreter {general_options.python}" | |
| ) | |
| pip_cmd = [ | |
| interpreter, | |
| get_runnable_pip(), | |
| ] | |
| pip_cmd.extend(args) | |
| # Set a flag so the child doesn't re-invoke itself, causing | |
| # an infinite loop. | |
| os.environ["_PIP_RUNNING_IN_SUBPROCESS"] = "1" | |
| returncode = 0 | |
| try: | |
| proc = subprocess.run(pip_cmd) | |
| returncode = proc.returncode | |
| except (subprocess.SubprocessError, OSError) as exc: | |
| raise CommandError(f"Failed to run pip under {interpreter}: {exc}") | |
| sys.exit(returncode) | |
| # --version | |
| if general_options.version: | |
| sys.stdout.write(parser.version) | |
| sys.stdout.write(os.linesep) | |
| sys.exit() | |
| # pip || pip help -> print_help() | |
| if not args_else or (args_else[0] == "help" and len(args_else) == 1): | |
| parser.print_help() | |
| sys.exit() | |
| # the subcommand name | |
| cmd_name = args_else[0] | |
| if cmd_name not in commands_dict: | |
| guess = get_similar_commands(cmd_name) | |
| msg = [f'unknown command "{cmd_name}"'] | |
| if guess: | |
| msg.append(f'maybe you meant "{guess}"') | |
| raise CommandError(" - ".join(msg)) | |
| # all the args without the subcommand | |
| cmd_args = args[:] | |
| cmd_args.remove(cmd_name) | |
| return cmd_name, cmd_args | |