forked from varia/varia.website
172 lines
6.5 KiB
Python
172 lines
6.5 KiB
Python
"""Logic that powers autocompletion installed by ``pip completion``.
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"""
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import optparse
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import os
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import sys
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from itertools import chain
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from typing import Any, Iterable, List, Optional
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from pip._internal.cli.main_parser import create_main_parser
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from pip._internal.commands import commands_dict, create_command
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from pip._internal.metadata import get_default_environment
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def autocomplete() -> None:
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"""Entry Point for completion of main and subcommand options."""
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# Don't complete if user hasn't sourced bash_completion file.
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if "PIP_AUTO_COMPLETE" not in os.environ:
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return
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cwords = os.environ["COMP_WORDS"].split()[1:]
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cword = int(os.environ["COMP_CWORD"])
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try:
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current = cwords[cword - 1]
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except IndexError:
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current = ""
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parser = create_main_parser()
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subcommands = list(commands_dict)
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options = []
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# subcommand
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subcommand_name: Optional[str] = None
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for word in cwords:
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if word in subcommands:
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subcommand_name = word
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break
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# subcommand options
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if subcommand_name is not None:
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# special case: 'help' subcommand has no options
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if subcommand_name == "help":
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sys.exit(1)
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# special case: list locally installed dists for show and uninstall
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should_list_installed = not current.startswith("-") and subcommand_name in [
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"show",
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"uninstall",
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]
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if should_list_installed:
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env = get_default_environment()
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lc = current.lower()
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installed = [
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dist.canonical_name
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for dist in env.iter_installed_distributions(local_only=True)
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if dist.canonical_name.startswith(lc)
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and dist.canonical_name not in cwords[1:]
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]
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# if there are no dists installed, fall back to option completion
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if installed:
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for dist in installed:
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print(dist)
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sys.exit(1)
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should_list_installables = (
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not current.startswith("-") and subcommand_name == "install"
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)
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if should_list_installables:
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for path in auto_complete_paths(current, "path"):
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print(path)
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sys.exit(1)
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subcommand = create_command(subcommand_name)
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for opt in subcommand.parser.option_list_all:
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if opt.help != optparse.SUPPRESS_HELP:
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for opt_str in opt._long_opts + opt._short_opts:
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options.append((opt_str, opt.nargs))
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# filter out previously specified options from available options
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prev_opts = [x.split("=")[0] for x in cwords[1 : cword - 1]]
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options = [(x, v) for (x, v) in options if x not in prev_opts]
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# filter options by current input
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options = [(k, v) for k, v in options if k.startswith(current)]
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# get completion type given cwords and available subcommand options
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completion_type = get_path_completion_type(
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cwords,
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cword,
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subcommand.parser.option_list_all,
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)
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# get completion files and directories if ``completion_type`` is
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# ``<file>``, ``<dir>`` or ``<path>``
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if completion_type:
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paths = auto_complete_paths(current, completion_type)
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options = [(path, 0) for path in paths]
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for option in options:
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opt_label = option[0]
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# append '=' to options which require args
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if option[1] and option[0][:2] == "--":
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opt_label += "="
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print(opt_label)
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else:
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# show main parser options only when necessary
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opts = [i.option_list for i in parser.option_groups]
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opts.append(parser.option_list)
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flattened_opts = chain.from_iterable(opts)
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if current.startswith("-"):
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for opt in flattened_opts:
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if opt.help != optparse.SUPPRESS_HELP:
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subcommands += opt._long_opts + opt._short_opts
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else:
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# get completion type given cwords and all available options
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completion_type = get_path_completion_type(cwords, cword, flattened_opts)
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if completion_type:
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subcommands = list(auto_complete_paths(current, completion_type))
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print(" ".join([x for x in subcommands if x.startswith(current)]))
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sys.exit(1)
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def get_path_completion_type(
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cwords: List[str], cword: int, opts: Iterable[Any]
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) -> Optional[str]:
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"""Get the type of path completion (``file``, ``dir``, ``path`` or None)
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:param cwords: same as the environmental variable ``COMP_WORDS``
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:param cword: same as the environmental variable ``COMP_CWORD``
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:param opts: The available options to check
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:return: path completion type (``file``, ``dir``, ``path`` or None)
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"""
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if cword < 2 or not cwords[cword - 2].startswith("-"):
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return None
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for opt in opts:
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if opt.help == optparse.SUPPRESS_HELP:
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continue
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for o in str(opt).split("/"):
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if cwords[cword - 2].split("=")[0] == o:
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if not opt.metavar or any(
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x in ("path", "file", "dir") for x in opt.metavar.split("/")
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):
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return opt.metavar
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return None
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def auto_complete_paths(current: str, completion_type: str) -> Iterable[str]:
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"""If ``completion_type`` is ``file`` or ``path``, list all regular files
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and directories starting with ``current``; otherwise only list directories
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starting with ``current``.
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:param current: The word to be completed
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:param completion_type: path completion type(``file``, ``path`` or ``dir``)
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:return: A generator of regular files and/or directories
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"""
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directory, filename = os.path.split(current)
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current_path = os.path.abspath(directory)
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# Don't complete paths if they can't be accessed
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if not os.access(current_path, os.R_OK):
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return
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filename = os.path.normcase(filename)
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# list all files that start with ``filename``
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file_list = (
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x for x in os.listdir(current_path) if os.path.normcase(x).startswith(filename)
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)
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for f in file_list:
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opt = os.path.join(current_path, f)
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comp_file = os.path.normcase(os.path.join(directory, f))
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# complete regular files when there is not ``<dir>`` after option
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# complete directories when there is ``<file>``, ``<path>`` or
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# ``<dir>``after option
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if completion_type != "dir" and os.path.isfile(opt):
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yield comp_file
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elif os.path.isdir(opt):
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yield os.path.join(comp_file, "")
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