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Current File : /proc/self/root/lib/python3/dist-packages/click/_bashcomplete.py
import copy
import os
import re

from .utils import echo
from .parser import split_arg_string
from .core import MultiCommand, Option, Argument
from .types import Choice

try:
    from collections import abc
except ImportError:
    import collections as abc

WORDBREAK = '='

# Note, only BASH version 4.4 and later have the nosort option.
COMPLETION_SCRIPT_BASH = '''
%(complete_func)s() {
    local IFS=$'\n'
    COMPREPLY=( $( env COMP_WORDS="${COMP_WORDS[*]}" \\
                   COMP_CWORD=$COMP_CWORD \\
                   %(autocomplete_var)s=complete $1 ) )
    return 0
}

%(complete_func)setup() {
    local COMPLETION_OPTIONS=""
    local BASH_VERSION_ARR=(${BASH_VERSION//./ })
    # Only BASH version 4.4 and later have the nosort option.
    if [ ${BASH_VERSION_ARR[0]} -gt 4 ] || ([ ${BASH_VERSION_ARR[0]} -eq 4 ] && [ ${BASH_VERSION_ARR[1]} -ge 4 ]); then
        COMPLETION_OPTIONS="-o nosort"
    fi

    complete $COMPLETION_OPTIONS -F %(complete_func)s %(script_names)s
}

%(complete_func)setup
'''

COMPLETION_SCRIPT_ZSH = '''
%(complete_func)s() {
    local -a completions
    local -a completions_with_descriptions
    local -a response
    response=("${(@f)$( env COMP_WORDS=\"${words[*]}\" \\
                        COMP_CWORD=$((CURRENT-1)) \\
                        %(autocomplete_var)s=\"complete_zsh\" \\
                        %(script_names)s )}")

    for key descr in ${(kv)response}; do
      if [[ "$descr" == "_" ]]; then
          completions+=("$key")
      else
          completions_with_descriptions+=("$key":"$descr")
      fi
    done

    if [ -n "$completions_with_descriptions" ]; then
        _describe -V unsorted completions_with_descriptions -U -Q
    fi

    if [ -n "$completions" ]; then
        compadd -U -V unsorted -Q -a completions
    fi
    compstate[insert]="automenu"
}

compdef %(complete_func)s %(script_names)s
'''

_invalid_ident_char_re = re.compile(r'[^a-zA-Z0-9_]')


def get_completion_script(prog_name, complete_var, shell):
    cf_name = _invalid_ident_char_re.sub('', prog_name.replace('-', '_'))
    script = COMPLETION_SCRIPT_ZSH if shell == 'zsh' else COMPLETION_SCRIPT_BASH
    return (script % {
        'complete_func': '_%s_completion' % cf_name,
        'script_names': prog_name,
        'autocomplete_var': complete_var,
    }).strip() + ';'


def resolve_ctx(cli, prog_name, args):
    """
    Parse into a hierarchy of contexts. Contexts are connected through the parent variable.
    :param cli: command definition
    :param prog_name: the program that is running
    :param args: full list of args
    :return: the final context/command parsed
    """
    ctx = cli.make_context(prog_name, args, resilient_parsing=True)
    args = ctx.protected_args + ctx.args
    while args:
        if isinstance(ctx.command, MultiCommand):
            if not ctx.command.chain:
                cmd_name, cmd, args = ctx.command.resolve_command(ctx, args)
                if cmd is None:
                    return ctx
                ctx = cmd.make_context(cmd_name, args, parent=ctx,
                                       resilient_parsing=True)
                args = ctx.protected_args + ctx.args
            else:
                # Walk chained subcommand contexts saving the last one.
                while args:
                    cmd_name, cmd, args = ctx.command.resolve_command(ctx, args)
                    if cmd is None:
                        return ctx
                    sub_ctx = cmd.make_context(cmd_name, args, parent=ctx,
                                               allow_extra_args=True,
                                               allow_interspersed_args=False,
                                               resilient_parsing=True)
                    args = sub_ctx.args
                ctx = sub_ctx
                args = sub_ctx.protected_args + sub_ctx.args
        else:
            break
    return ctx


def start_of_option(param_str):
    """
    :param param_str: param_str to check
    :return: whether or not this is the start of an option declaration (i.e. starts "-" or "--")
    """
    return param_str and param_str[:1] == '-'


def is_incomplete_option(all_args, cmd_param):
    """
    :param all_args: the full original list of args supplied
    :param cmd_param: the current command paramter
    :return: whether or not the last option declaration (i.e. starts "-" or "--") is incomplete and
    corresponds to this cmd_param. In other words whether this cmd_param option can still accept
    values
    """
    if not isinstance(cmd_param, Option):
        return False
    if cmd_param.is_flag:
        return False
    last_option = None
    for index, arg_str in enumerate(reversed([arg for arg in all_args if arg != WORDBREAK])):
        if index + 1 > cmd_param.nargs:
            break
        if start_of_option(arg_str):
            last_option = arg_str

    return True if last_option and last_option in cmd_param.opts else False


def is_incomplete_argument(current_params, cmd_param):
    """
    :param current_params: the current params and values for this argument as already entered
    :param cmd_param: the current command parameter
    :return: whether or not the last argument is incomplete and corresponds to this cmd_param. In
    other words whether or not the this cmd_param argument can still accept values
    """
    if not isinstance(cmd_param, Argument):
        return False
    current_param_values = current_params[cmd_param.name]
    if current_param_values is None:
        return True
    if cmd_param.nargs == -1:
        return True
    if isinstance(current_param_values, abc.Iterable) \
            and cmd_param.nargs > 1 and len(current_param_values) < cmd_param.nargs:
        return True
    return False


def get_user_autocompletions(ctx, args, incomplete, cmd_param):
    """
    :param ctx: context associated with the parsed command
    :param args: full list of args
    :param incomplete: the incomplete text to autocomplete
    :param cmd_param: command definition
    :return: all the possible user-specified completions for the param
    """
    results = []
    if isinstance(cmd_param.type, Choice):
        # Choices don't support descriptions.
        results = [(c, None)
                   for c in cmd_param.type.choices if str(c).startswith(incomplete)]
    elif cmd_param.autocompletion is not None:
        dynamic_completions = cmd_param.autocompletion(ctx=ctx,
                                                       args=args,
                                                       incomplete=incomplete)
        results = [c if isinstance(c, tuple) else (c, None)
                   for c in dynamic_completions]
    return results


def get_visible_commands_starting_with(ctx, starts_with):
    """
    :param ctx: context associated with the parsed command
    :starts_with: string that visible commands must start with.
    :return: all visible (not hidden) commands that start with starts_with.
    """
    for c in ctx.command.list_commands(ctx):
        if c.startswith(starts_with):
            command = ctx.command.get_command(ctx, c)
            if not command.hidden:
                yield command


def add_subcommand_completions(ctx, incomplete, completions_out):
    # Add subcommand completions.
    if isinstance(ctx.command, MultiCommand):
        completions_out.extend(
            [(c.name, c.get_short_help_str()) for c in get_visible_commands_starting_with(ctx, incomplete)])

    # Walk up the context list and add any other completion possibilities from chained commands
    while ctx.parent is not None:
        ctx = ctx.parent
        if isinstance(ctx.command, MultiCommand) and ctx.command.chain:
            remaining_commands = [c for c in get_visible_commands_starting_with(ctx, incomplete)
                                  if c.name not in ctx.protected_args]
            completions_out.extend([(c.name, c.get_short_help_str()) for c in remaining_commands])


def get_choices(cli, prog_name, args, incomplete):
    """
    :param cli: command definition
    :param prog_name: the program that is running
    :param args: full list of args
    :param incomplete: the incomplete text to autocomplete
    :return: all the possible completions for the incomplete
    """
    all_args = copy.deepcopy(args)

    ctx = resolve_ctx(cli, prog_name, args)
    if ctx is None:
        return []

    # In newer versions of bash long opts with '='s are partitioned, but it's easier to parse
    # without the '='
    if start_of_option(incomplete) and WORDBREAK in incomplete:
        partition_incomplete = incomplete.partition(WORDBREAK)
        all_args.append(partition_incomplete[0])
        incomplete = partition_incomplete[2]
    elif incomplete == WORDBREAK:
        incomplete = ''

    completions = []
    if start_of_option(incomplete):
        # completions for partial options
        for param in ctx.command.params:
            if isinstance(param, Option) and not param.hidden:
                param_opts = [param_opt for param_opt in param.opts +
                              param.secondary_opts if param_opt not in all_args or param.multiple]
                completions.extend([(o, param.help) for o in param_opts if o.startswith(incomplete)])
        return completions
    # completion for option values from user supplied values
    for param in ctx.command.params:
        if is_incomplete_option(all_args, param):
            return get_user_autocompletions(ctx, all_args, incomplete, param)
    # completion for argument values from user supplied values
    for param in ctx.command.params:
        if is_incomplete_argument(ctx.params, param):
            return get_user_autocompletions(ctx, all_args, incomplete, param)

    add_subcommand_completions(ctx, incomplete, completions)
    # Sort before returning so that proper ordering can be enforced in custom types.
    return sorted(completions)


def do_complete(cli, prog_name, include_descriptions):
    cwords = split_arg_string(os.environ['COMP_WORDS'])
    cword = int(os.environ['COMP_CWORD'])
    args = cwords[1:cword]
    try:
        incomplete = cwords[cword]
    except IndexError:
        incomplete = ''

    for item in get_choices(cli, prog_name, args, incomplete):
        echo(item[0])
        if include_descriptions:
            # ZSH has trouble dealing with empty array parameters when returned from commands, so use a well defined character '_' to indicate no description is present.
            echo(item[1] if item[1] else '_')

    return True


def bashcomplete(cli, prog_name, complete_var, complete_instr):
    if complete_instr.startswith('source'):
        shell = 'zsh' if complete_instr == 'source_zsh' else 'bash'
        echo(get_completion_script(prog_name, complete_var, shell))
        return True
    elif complete_instr == 'complete' or complete_instr == 'complete_zsh':
        return do_complete(cli, prog_name, complete_instr == 'complete_zsh')
    return False

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