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annotate lib/python3.8/site-packages/pip/_internal/cli/main_parser.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -0400
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1 """A single place for constructing and exposing the main parser
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2 """
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3
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4 import os
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5 import sys
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6
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7 from pip._internal.cli import cmdoptions
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8 from pip._internal.cli.parser import (
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9 ConfigOptionParser,
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10 UpdatingDefaultsHelpFormatter,
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11 )
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12 from pip._internal.commands import commands_dict, get_similar_commands
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13 from pip._internal.exceptions import CommandError
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14 from pip._internal.utils.misc import get_pip_version, get_prog
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15 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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16
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17 if MYPY_CHECK_RUNNING:
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18 from typing import Tuple, List
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19
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20
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21 __all__ = ["create_main_parser", "parse_command"]
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22
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23
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24 def create_main_parser():
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25 # type: () -> ConfigOptionParser
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26 """Creates and returns the main parser for pip's CLI
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27 """
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28
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29 parser_kw = {
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30 'usage': '\n%prog <command> [options]',
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31 'add_help_option': False,
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32 'formatter': UpdatingDefaultsHelpFormatter(),
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33 'name': 'global',
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34 'prog': get_prog(),
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35 }
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36
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37 parser = ConfigOptionParser(**parser_kw)
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38 parser.disable_interspersed_args()
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39
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40 parser.version = get_pip_version()
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41
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42 # add the general options
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43 gen_opts = cmdoptions.make_option_group(cmdoptions.general_group, parser)
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44 parser.add_option_group(gen_opts)
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45
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46 # so the help formatter knows
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47 parser.main = True # type: ignore
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48
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49 # create command listing for description
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50 description = [''] + [
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51 '%-27s %s' % (name, command_info.summary)
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52 for name, command_info in commands_dict.items()
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53 ]
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54 parser.description = '\n'.join(description)
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55
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56 return parser
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57
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58
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59 def parse_command(args):
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60 # type: (List[str]) -> Tuple[str, List[str]]
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61 parser = create_main_parser()
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62
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63 # Note: parser calls disable_interspersed_args(), so the result of this
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64 # call is to split the initial args into the general options before the
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65 # subcommand and everything else.
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66 # For example:
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67 # args: ['--timeout=5', 'install', '--user', 'INITools']
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68 # general_options: ['--timeout==5']
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69 # args_else: ['install', '--user', 'INITools']
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70 general_options, args_else = parser.parse_args(args)
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71
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72 # --version
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73 if general_options.version:
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74 sys.stdout.write(parser.version) # type: ignore
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75 sys.stdout.write(os.linesep)
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76 sys.exit()
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77
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78 # pip || pip help -> print_help()
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79 if not args_else or (args_else[0] == 'help' and len(args_else) == 1):
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80 parser.print_help()
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81 sys.exit()
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82
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83 # the subcommand name
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84 cmd_name = args_else[0]
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85
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86 if cmd_name not in commands_dict:
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87 guess = get_similar_commands(cmd_name)
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88
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89 msg = ['unknown command "%s"' % cmd_name]
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90 if guess:
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91 msg.append('maybe you meant "%s"' % guess)
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92
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93 raise CommandError(' - '.join(msg))
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94
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95 # all the args without the subcommand
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96 cmd_args = args[:]
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97 cmd_args.remove(cmd_name)
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98
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99 return cmd_name, cmd_args