/
core.py
1835 lines (1568 loc) · 72.1 KB
/
core.py
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import errno
import inspect
import os
import sys
from contextlib import contextmanager
from itertools import repeat
from functools import update_wrapper
from .types import convert_type, IntRange, BOOL
from .utils import make_str, make_default_short_help, echo, get_os_args
from .exceptions import ClickException, UsageError, BadParameter, Abort, \
MissingParameter, Exit
from .termui import prompt, confirm, style
from .formatting import HelpFormatter, join_options
from .parser import OptionParser, split_opt
from .globals import push_context, pop_context
from ._compat import PY2, isidentifier, iteritems, string_types
from ._unicodefun import _check_for_unicode_literals, _verify_python3_env
_missing = object()
SUBCOMMAND_METAVAR = 'COMMAND [ARGS]...'
SUBCOMMANDS_METAVAR = 'COMMAND1 [ARGS]... [COMMAND2 [ARGS]...]...'
DEPRECATED_HELP_NOTICE = ' (DEPRECATED)'
DEPRECATED_INVOKE_NOTICE = 'DeprecationWarning: ' + \
'The command %(name)s is deprecated.'
def _maybe_show_deprecated_notice(cmd):
if cmd.deprecated:
echo(style(DEPRECATED_INVOKE_NOTICE % {'name': cmd.name}, fg='red'), err=True)
def fast_exit(code):
"""Exit without garbage collection, this speeds up exit by about 10ms for
things like bash completion.
"""
sys.stdout.flush()
sys.stderr.flush()
os._exit(code)
def _bashcomplete(cmd, prog_name, complete_var=None):
"""Internal handler for the bash completion support."""
if complete_var is None:
complete_var = '_%s_COMPLETE' % (prog_name.replace('-', '_')).upper()
complete_instr = os.environ.get(complete_var)
if not complete_instr:
return
from ._bashcomplete import bashcomplete
if bashcomplete(cmd, prog_name, complete_var, complete_instr):
fast_exit(1)
def _check_multicommand(base_command, cmd_name, cmd, register=False):
if not base_command.chain or not isinstance(cmd, MultiCommand):
return
if register:
hint = 'It is not possible to add multi commands as children to ' \
'another multi command that is in chain mode'
else:
hint = 'Found a multi command as subcommand to a multi command ' \
'that is in chain mode. This is not supported'
raise RuntimeError('%s. Command "%s" is set to chain and "%s" was '
'added as subcommand but it in itself is a '
'multi command. ("%s" is a %s within a chained '
'%s named "%s").' % (
hint, base_command.name, cmd_name,
cmd_name, cmd.__class__.__name__,
base_command.__class__.__name__,
base_command.name))
def batch(iterable, batch_size):
return list(zip(*repeat(iter(iterable), batch_size)))
def invoke_param_callback(callback, ctx, param, value):
code = getattr(callback, '__code__', None)
args = getattr(code, 'co_argcount', 3)
if args < 3:
# This will become a warning in Click 3.0:
from warnings import warn
warn(Warning('Invoked legacy parameter callback "%s". The new '
'signature for such callbacks starting with '
'click 2.0 is (ctx, param, value).'
% callback), stacklevel=3)
return callback(ctx, value)
return callback(ctx, param, value)
@contextmanager
def augment_usage_errors(ctx, param=None):
"""Context manager that attaches extra information to exceptions that
fly.
"""
try:
yield
except BadParameter as e:
if e.ctx is None:
e.ctx = ctx
if param is not None and e.param is None:
e.param = param
raise
except UsageError as e:
if e.ctx is None:
e.ctx = ctx
raise
def iter_params_for_processing(invocation_order, declaration_order):
"""Given a sequence of parameters in the order as should be considered
for processing and an iterable of parameters that exist, this returns
a list in the correct order as they should be processed.
"""
def sort_key(item):
try:
idx = invocation_order.index(item)
except ValueError:
idx = float('inf')
return (not item.is_eager, idx)
return sorted(declaration_order, key=sort_key)
class Context(object):
"""The context is a special internal object that holds state relevant
for the script execution at every single level. It's normally invisible
to commands unless they opt-in to getting access to it.
The context is useful as it can pass internal objects around and can
control special execution features such as reading data from
environment variables.
A context can be used as context manager in which case it will call
:meth:`close` on teardown.
.. versionadded:: 2.0
Added the `resilient_parsing`, `help_option_names`,
`token_normalize_func` parameters.
.. versionadded:: 3.0
Added the `allow_extra_args` and `allow_interspersed_args`
parameters.
.. versionadded:: 4.0
Added the `color`, `ignore_unknown_options`, and
`max_content_width` parameters.
:param command: the command class for this context.
:param parent: the parent context.
:param info_name: the info name for this invocation. Generally this
is the most descriptive name for the script or
command. For the toplevel script it is usually
the name of the script, for commands below it it's
the name of the script.
:param obj: an arbitrary object of user data.
:param auto_envvar_prefix: the prefix to use for automatic environment
variables. If this is `None` then reading
from environment variables is disabled. This
does not affect manually set environment
variables which are always read.
:param default_map: a dictionary (like object) with default values
for parameters.
:param terminal_width: the width of the terminal. The default is
inherit from parent context. If no context
defines the terminal width then auto
detection will be applied.
:param max_content_width: the maximum width for content rendered by
Click (this currently only affects help
pages). This defaults to 80 characters if
not overridden. In other words: even if the
terminal is larger than that, Click will not
format things wider than 80 characters by
default. In addition to that, formatters might
add some safety mapping on the right.
:param resilient_parsing: if this flag is enabled then Click will
parse without any interactivity or callback
invocation. This is useful for implementing
things such as completion support.
:param allow_extra_args: if this is set to `True` then extra arguments
at the end will not raise an error and will be
kept on the context. The default is to inherit
from the command.
:param allow_interspersed_args: if this is set to `False` then options
and arguments cannot be mixed. The
default is to inherit from the command.
:param ignore_unknown_options: instructs click to ignore options it does
not know and keeps them for later
processing.
:param help_option_names: optionally a list of strings that define how
the default help parameter is named. The
default is ``['--help']``.
:param token_normalize_func: an optional function that is used to
normalize tokens (options, choices,
etc.). This for instance can be used to
implement case insensitive behavior.
:param color: controls if the terminal supports ANSI colors or not. The
default is autodetection. This is only needed if ANSI
codes are used in texts that Click prints which is by
default not the case. This for instance would affect
help output.
"""
def __init__(self, command, parent=None, info_name=None, obj=None,
auto_envvar_prefix=None, default_map=None,
terminal_width=None, max_content_width=None,
resilient_parsing=False, allow_extra_args=None,
allow_interspersed_args=None,
ignore_unknown_options=None, help_option_names=None,
token_normalize_func=None, color=None):
#: the parent context or `None` if none exists.
self.parent = parent
#: the :class:`Command` for this context.
self.command = command
#: the descriptive information name
self.info_name = info_name
#: the parsed parameters except if the value is hidden in which
#: case it's not remembered.
self.params = {}
#: the leftover arguments.
self.args = []
#: protected arguments. These are arguments that are prepended
#: to `args` when certain parsing scenarios are encountered but
#: must be never propagated to another arguments. This is used
#: to implement nested parsing.
self.protected_args = []
if obj is None and parent is not None:
obj = parent.obj
#: the user object stored.
self.obj = obj
self._meta = getattr(parent, 'meta', {})
#: A dictionary (-like object) with defaults for parameters.
if default_map is None \
and parent is not None \
and parent.default_map is not None:
default_map = parent.default_map.get(info_name)
self.default_map = default_map
#: This flag indicates if a subcommand is going to be executed. A
#: group callback can use this information to figure out if it's
#: being executed directly or because the execution flow passes
#: onwards to a subcommand. By default it's None, but it can be
#: the name of the subcommand to execute.
#:
#: If chaining is enabled this will be set to ``'*'`` in case
#: any commands are executed. It is however not possible to
#: figure out which ones. If you require this knowledge you
#: should use a :func:`resultcallback`.
self.invoked_subcommand = None
if terminal_width is None and parent is not None:
terminal_width = parent.terminal_width
#: The width of the terminal (None is autodetection).
self.terminal_width = terminal_width
if max_content_width is None and parent is not None:
max_content_width = parent.max_content_width
#: The maximum width of formatted content (None implies a sensible
#: default which is 80 for most things).
self.max_content_width = max_content_width
if allow_extra_args is None:
allow_extra_args = command.allow_extra_args
#: Indicates if the context allows extra args or if it should
#: fail on parsing.
#:
#: .. versionadded:: 3.0
self.allow_extra_args = allow_extra_args
if allow_interspersed_args is None:
allow_interspersed_args = command.allow_interspersed_args
#: Indicates if the context allows mixing of arguments and
#: options or not.
#:
#: .. versionadded:: 3.0
self.allow_interspersed_args = allow_interspersed_args
if ignore_unknown_options is None:
ignore_unknown_options = command.ignore_unknown_options
#: Instructs click to ignore options that a command does not
#: understand and will store it on the context for later
#: processing. This is primarily useful for situations where you
#: want to call into external programs. Generally this pattern is
#: strongly discouraged because it's not possibly to losslessly
#: forward all arguments.
#:
#: .. versionadded:: 4.0
self.ignore_unknown_options = ignore_unknown_options
if help_option_names is None:
if parent is not None:
help_option_names = parent.help_option_names
else:
help_option_names = ['--help']
#: The names for the help options.
self.help_option_names = help_option_names
if token_normalize_func is None and parent is not None:
token_normalize_func = parent.token_normalize_func
#: An optional normalization function for tokens. This is
#: options, choices, commands etc.
self.token_normalize_func = token_normalize_func
#: Indicates if resilient parsing is enabled. In that case Click
#: will do its best to not cause any failures.
self.resilient_parsing = resilient_parsing
# If there is no envvar prefix yet, but the parent has one and
# the command on this level has a name, we can expand the envvar
# prefix automatically.
if auto_envvar_prefix is None:
if parent is not None \
and parent.auto_envvar_prefix is not None and \
self.info_name is not None:
auto_envvar_prefix = '%s_%s' % (parent.auto_envvar_prefix,
self.info_name.upper())
else:
self.auto_envvar_prefix = auto_envvar_prefix.upper()
self.auto_envvar_prefix = auto_envvar_prefix
if color is None and parent is not None:
color = parent.color
#: Controls if styling output is wanted or not.
self.color = color
self._close_callbacks = []
self._depth = 0
def __enter__(self):
self._depth += 1
push_context(self)
return self
def __exit__(self, exc_type, exc_value, tb):
self._depth -= 1
if self._depth == 0:
self.close()
pop_context()
@contextmanager
def scope(self, cleanup=True):
"""This helper method can be used with the context object to promote
it to the current thread local (see :func:`get_current_context`).
The default behavior of this is to invoke the cleanup functions which
can be disabled by setting `cleanup` to `False`. The cleanup
functions are typically used for things such as closing file handles.
If the cleanup is intended the context object can also be directly
used as a context manager.
Example usage::
with ctx.scope():
assert get_current_context() is ctx
This is equivalent::
with ctx:
assert get_current_context() is ctx
.. versionadded:: 5.0
:param cleanup: controls if the cleanup functions should be run or
not. The default is to run these functions. In
some situations the context only wants to be
temporarily pushed in which case this can be disabled.
Nested pushes automatically defer the cleanup.
"""
if not cleanup:
self._depth += 1
try:
with self as rv:
yield rv
finally:
if not cleanup:
self._depth -= 1
@property
def meta(self):
"""This is a dictionary which is shared with all the contexts
that are nested. It exists so that click utilities can store some
state here if they need to. It is however the responsibility of
that code to manage this dictionary well.
The keys are supposed to be unique dotted strings. For instance
module paths are a good choice for it. What is stored in there is
irrelevant for the operation of click. However what is important is
that code that places data here adheres to the general semantics of
the system.
Example usage::
LANG_KEY = __name__ + '.lang'
def set_language(value):
ctx = get_current_context()
ctx.meta[LANG_KEY] = value
def get_language():
return get_current_context().meta.get(LANG_KEY, 'en_US')
.. versionadded:: 5.0
"""
return self._meta
def make_formatter(self):
"""Creates the formatter for the help and usage output."""
return HelpFormatter(width=self.terminal_width,
max_width=self.max_content_width)
def call_on_close(self, f):
"""This decorator remembers a function as callback that should be
executed when the context tears down. This is most useful to bind
resource handling to the script execution. For instance, file objects
opened by the :class:`File` type will register their close callbacks
here.
:param f: the function to execute on teardown.
"""
self._close_callbacks.append(f)
return f
def close(self):
"""Invokes all close callbacks."""
for cb in self._close_callbacks:
cb()
self._close_callbacks = []
@property
def command_path(self):
"""The computed command path. This is used for the ``usage``
information on the help page. It's automatically created by
combining the info names of the chain of contexts to the root.
"""
rv = ''
if self.info_name is not None:
rv = self.info_name
if self.parent is not None:
rv = self.parent.command_path + ' ' + rv
return rv.lstrip()
def find_root(self):
"""Finds the outermost context."""
node = self
while node.parent is not None:
node = node.parent
return node
def find_object(self, object_type):
"""Finds the closest object of a given type."""
node = self
while node is not None:
if isinstance(node.obj, object_type):
return node.obj
node = node.parent
def ensure_object(self, object_type):
"""Like :meth:`find_object` but sets the innermost object to a
new instance of `object_type` if it does not exist.
"""
rv = self.find_object(object_type)
if rv is None:
self.obj = rv = object_type()
return rv
def lookup_default(self, name):
"""Looks up the default for a parameter name. This by default
looks into the :attr:`default_map` if available.
"""
if self.default_map is not None:
rv = self.default_map.get(name)
if callable(rv):
rv = rv()
return rv
def fail(self, message):
"""Aborts the execution of the program with a specific error
message.
:param message: the error message to fail with.
"""
raise UsageError(message, self)
def abort(self):
"""Aborts the script."""
raise Abort()
def exit(self, code=0):
"""Exits the application with a given exit code."""
raise Exit(code)
def get_usage(self):
"""Helper method to get formatted usage string for the current
context and command.
"""
return self.command.get_usage(self)
def get_help(self):
"""Helper method to get formatted help page for the current
context and command.
"""
return self.command.get_help(self)
def invoke(*args, **kwargs):
"""Invokes a command callback in exactly the way it expects. There
are two ways to invoke this method:
1. the first argument can be a callback and all other arguments and
keyword arguments are forwarded directly to the function.
2. the first argument is a click command object. In that case all
arguments are forwarded as well but proper click parameters
(options and click arguments) must be keyword arguments and Click
will fill in defaults.
Note that before Click 3.2 keyword arguments were not properly filled
in against the intention of this code and no context was created. For
more information about this change and why it was done in a bugfix
release see :ref:`upgrade-to-3.2`.
"""
self, callback = args[:2]
ctx = self
# It's also possible to invoke another command which might or
# might not have a callback. In that case we also fill
# in defaults and make a new context for this command.
if isinstance(callback, Command):
other_cmd = callback
callback = other_cmd.callback
ctx = Context(other_cmd, info_name=other_cmd.name, parent=self)
if callback is None:
raise TypeError('The given command does not have a '
'callback that can be invoked.')
for param in other_cmd.params:
if param.name not in kwargs and param.expose_value:
kwargs[param.name] = param.get_default(ctx)
args = args[2:]
with augment_usage_errors(self):
with ctx:
return callback(*args, **kwargs)
def forward(*args, **kwargs):
"""Similar to :meth:`invoke` but fills in default keyword
arguments from the current context if the other command expects
it. This cannot invoke callbacks directly, only other commands.
"""
self, cmd = args[:2]
# It's also possible to invoke another command which might or
# might not have a callback.
if not isinstance(cmd, Command):
raise TypeError('Callback is not a command.')
for param in self.params:
if param not in kwargs:
kwargs[param] = self.params[param]
return self.invoke(cmd, **kwargs)
class BaseCommand(object):
"""The base command implements the minimal API contract of commands.
Most code will never use this as it does not implement a lot of useful
functionality but it can act as the direct subclass of alternative
parsing methods that do not depend on the Click parser.
For instance, this can be used to bridge Click and other systems like
argparse or docopt.
Because base commands do not implement a lot of the API that other
parts of Click take for granted, they are not supported for all
operations. For instance, they cannot be used with the decorators
usually and they have no built-in callback system.
.. versionchanged:: 2.0
Added the `context_settings` parameter.
:param name: the name of the command to use unless a group overrides it.
:param context_settings: an optional dictionary with defaults that are
passed to the context object.
"""
#: the default for the :attr:`Context.allow_extra_args` flag.
allow_extra_args = False
#: the default for the :attr:`Context.allow_interspersed_args` flag.
allow_interspersed_args = True
#: the default for the :attr:`Context.ignore_unknown_options` flag.
ignore_unknown_options = False
def __init__(self, name, context_settings=None):
#: the name the command thinks it has. Upon registering a command
#: on a :class:`Group` the group will default the command name
#: with this information. You should instead use the
#: :class:`Context`\'s :attr:`~Context.info_name` attribute.
self.name = name
if context_settings is None:
context_settings = {}
#: an optional dictionary with defaults passed to the context.
self.context_settings = context_settings
def get_usage(self, ctx):
raise NotImplementedError('Base commands cannot get usage')
def get_help(self, ctx):
raise NotImplementedError('Base commands cannot get help')
def make_context(self, info_name, args, parent=None, **extra):
"""This function when given an info name and arguments will kick
off the parsing and create a new :class:`Context`. It does not
invoke the actual command callback though.
:param info_name: the info name for this invokation. Generally this
is the most descriptive name for the script or
command. For the toplevel script it's usually
the name of the script, for commands below it it's
the name of the script.
:param args: the arguments to parse as list of strings.
:param parent: the parent context if available.
:param extra: extra keyword arguments forwarded to the context
constructor.
"""
for key, value in iteritems(self.context_settings):
if key not in extra:
extra[key] = value
ctx = Context(self, info_name=info_name, parent=parent, **extra)
with ctx.scope(cleanup=False):
self.parse_args(ctx, args)
return ctx
def parse_args(self, ctx, args):
"""Given a context and a list of arguments this creates the parser
and parses the arguments, then modifies the context as necessary.
This is automatically invoked by :meth:`make_context`.
"""
raise NotImplementedError('Base commands do not know how to parse '
'arguments.')
def invoke(self, ctx):
"""Given a context, this invokes the command. The default
implementation is raising a not implemented error.
"""
raise NotImplementedError('Base commands are not invokable by default')
def main(self, args=None, prog_name=None, complete_var=None,
standalone_mode=True, **extra):
"""This is the way to invoke a script with all the bells and
whistles as a command line application. This will always terminate
the application after a call. If this is not wanted, ``SystemExit``
needs to be caught.
This method is also available by directly calling the instance of
a :class:`Command`.
.. versionadded:: 3.0
Added the `standalone_mode` flag to control the standalone mode.
:param args: the arguments that should be used for parsing. If not
provided, ``sys.argv[1:]`` is used.
:param prog_name: the program name that should be used. By default
the program name is constructed by taking the file
name from ``sys.argv[0]``.
:param complete_var: the environment variable that controls the
bash completion support. The default is
``"_<prog_name>_COMPLETE"`` with prog_name in
uppercase.
:param standalone_mode: the default behavior is to invoke the script
in standalone mode. Click will then
handle exceptions and convert them into
error messages and the function will never
return but shut down the interpreter. If
this is set to `False` they will be
propagated to the caller and the return
value of this function is the return value
of :meth:`invoke`.
:param extra: extra keyword arguments are forwarded to the context
constructor. See :class:`Context` for more information.
"""
# If we are in Python 3, we will verify that the environment is
# sane at this point or reject further execution to avoid a
# broken script.
if not PY2:
_verify_python3_env()
else:
_check_for_unicode_literals()
if args is None:
args = get_os_args()
else:
args = list(args)
if prog_name is None:
prog_name = make_str(os.path.basename(
sys.argv and sys.argv[0] or __file__))
# Hook for the Bash completion. This only activates if the Bash
# completion is actually enabled, otherwise this is quite a fast
# noop.
_bashcomplete(self, prog_name, complete_var)
try:
try:
with self.make_context(prog_name, args, **extra) as ctx:
rv = self.invoke(ctx)
if not standalone_mode:
return rv
ctx.exit(rv)
except (EOFError, KeyboardInterrupt):
echo(file=sys.stderr)
raise Abort()
except ClickException as e:
if not standalone_mode:
raise
e.show()
sys.exit(e.exit_code)
except IOError as e:
if e.errno == errno.EPIPE:
sys.exit(1)
else:
raise
except Exit as e:
if standalone_mode:
sys.exit(e.exit_code)
else:
return e.exit_code
except Abort:
if not standalone_mode:
raise
echo('Aborted!', file=sys.stderr)
sys.exit(1)
def __call__(self, *args, **kwargs):
"""Alias for :meth:`main`."""
return self.main(*args, **kwargs)
class Command(BaseCommand):
"""Commands are the basic building block of command line interfaces in
Click. A basic command handles command line parsing and might dispatch
more parsing to commands nested below it.
.. versionchanged:: 2.0
Added the `context_settings` parameter.
:param name: the name of the command to use unless a group overrides it.
:param context_settings: an optional dictionary with defaults that are
passed to the context object.
:param callback: the callback to invoke. This is optional.
:param params: the parameters to register with this command. This can
be either :class:`Option` or :class:`Argument` objects.
:param help: the help string to use for this command.
:param epilog: like the help string but it's printed at the end of the
help page after everything else.
:param short_help: the short help to use for this command. This is
shown on the command listing of the parent command.
:param add_help_option: by default each command registers a ``--help``
option. This can be disabled by this parameter.
:param hidden: hide this command from help outputs.
:param deprecated: issues a message indicating that
the command is deprecated.
"""
def __init__(self, name, context_settings=None, callback=None,
params=None, help=None, epilog=None, short_help=None,
options_metavar='[OPTIONS]', add_help_option=True,
hidden=False, deprecated=False):
BaseCommand.__init__(self, name, context_settings)
#: the callback to execute when the command fires. This might be
#: `None` in which case nothing happens.
self.callback = callback
#: the list of parameters for this command in the order they
#: should show up in the help page and execute. Eager parameters
#: will automatically be handled before non eager ones.
self.params = params or []
self.help = help
self.epilog = epilog
self.options_metavar = options_metavar
self.short_help = short_help
self.add_help_option = add_help_option
self.hidden = hidden
self.deprecated = deprecated
def get_usage(self, ctx):
formatter = ctx.make_formatter()
self.format_usage(ctx, formatter)
return formatter.getvalue().rstrip('\n')
def get_params(self, ctx):
rv = self.params
help_option = self.get_help_option(ctx)
if help_option is not None:
rv = rv + [help_option]
return rv
def format_usage(self, ctx, formatter):
"""Writes the usage line into the formatter."""
pieces = self.collect_usage_pieces(ctx)
formatter.write_usage(ctx.command_path, ' '.join(pieces))
def collect_usage_pieces(self, ctx):
"""Returns all the pieces that go into the usage line and returns
it as a list of strings.
"""
rv = [self.options_metavar]
for param in self.get_params(ctx):
rv.extend(param.get_usage_pieces(ctx))
return rv
def get_help_option_names(self, ctx):
"""Returns the names for the help option."""
all_names = set(ctx.help_option_names)
for param in self.params:
all_names.difference_update(param.opts)
all_names.difference_update(param.secondary_opts)
return all_names
def get_help_option(self, ctx):
"""Returns the help option object."""
help_options = self.get_help_option_names(ctx)
if not help_options or not self.add_help_option:
return
def show_help(ctx, param, value):
if value and not ctx.resilient_parsing:
echo(ctx.get_help(), color=ctx.color)
ctx.exit()
return Option(help_options, is_flag=True,
is_eager=True, expose_value=False,
callback=show_help,
help='Show this message and exit.')
def make_parser(self, ctx):
"""Creates the underlying option parser for this command."""
parser = OptionParser(ctx)
for param in self.get_params(ctx):
param.add_to_parser(parser, ctx)
return parser
def get_help(self, ctx):
"""Formats the help into a string and returns it. This creates a
formatter and will call into the following formatting methods:
"""
formatter = ctx.make_formatter()
self.format_help(ctx, formatter)
return formatter.getvalue().rstrip('\n')
def get_short_help_str(self, limit=45):
"""Gets short help for the command or makes it by shortening the long help string."""
return self.short_help or self.help and make_default_short_help(self.help, limit) or ''
def format_help(self, ctx, formatter):
"""Writes the help into the formatter if it exists.
This calls into the following methods:
- :meth:`format_usage`
- :meth:`format_help_text`
- :meth:`format_options`
- :meth:`format_epilog`
"""
self.format_usage(ctx, formatter)
self.format_help_text(ctx, formatter)
self.format_options(ctx, formatter)
self.format_epilog(ctx, formatter)
def format_help_text(self, ctx, formatter):
"""Writes the help text to the formatter if it exists."""
if self.help:
formatter.write_paragraph()
with formatter.indentation():
help_text = self.help
if self.deprecated:
help_text += DEPRECATED_HELP_NOTICE
formatter.write_text(help_text)
elif self.deprecated:
formatter.write_paragraph()
with formatter.indentation():
formatter.write_text(DEPRECATED_HELP_NOTICE)
def format_options(self, ctx, formatter):
"""Writes all the options into the formatter if they exist."""
opts = []
for param in self.get_params(ctx):
rv = param.get_help_record(ctx)
if rv is not None:
opts.append(rv)
if opts:
with formatter.section('Options'):
formatter.write_dl(opts)
def format_epilog(self, ctx, formatter):
"""Writes the epilog into the formatter if it exists."""
if self.epilog:
formatter.write_paragraph()
with formatter.indentation():
formatter.write_text(self.epilog)
def parse_args(self, ctx, args):
parser = self.make_parser(ctx)
opts, args, param_order = parser.parse_args(args=args)
for param in iter_params_for_processing(
param_order, self.get_params(ctx)):
value, args = param.handle_parse_result(ctx, opts, args)
if args and not ctx.allow_extra_args and not ctx.resilient_parsing:
ctx.fail('Got unexpected extra argument%s (%s)'
% (len(args) != 1 and 's' or '',
' '.join(map(make_str, args))))
ctx.args = args
return args
def invoke(self, ctx):
"""Given a context, this invokes the attached callback (if it exists)
in the right way.
"""
_maybe_show_deprecated_notice(self)
if self.callback is not None:
return ctx.invoke(self.callback, **ctx.params)
class MultiCommand(Command):
"""A multi command is the basic implementation of a command that
dispatches to subcommands. The most common version is the
:class:`Group`.
:param invoke_without_command: this controls how the multi command itself
is invoked. By default it's only invoked
if a subcommand is provided.
:param no_args_is_help: this controls what happens if no arguments are
provided. This option is enabled by default if
`invoke_without_command` is disabled or disabled
if it's enabled. If enabled this will add
``--help`` as argument if no arguments are
passed.
:param subcommand_metavar: the string that is used in the documentation
to indicate the subcommand place.
:param chain: if this is set to `True` chaining of multiple subcommands
is enabled. This restricts the form of commands in that
they cannot have optional arguments but it allows
multiple commands to be chained together.
:param result_callback: the result callback to attach to this multi
command.
"""
allow_extra_args = True
allow_interspersed_args = False
def __init__(self, name=None, invoke_without_command=False,
no_args_is_help=None, subcommand_metavar=None,
chain=False, result_callback=None, **attrs):
Command.__init__(self, name, **attrs)
if no_args_is_help is None:
no_args_is_help = not invoke_without_command
self.no_args_is_help = no_args_is_help
self.invoke_without_command = invoke_without_command
if subcommand_metavar is None:
if chain:
subcommand_metavar = SUBCOMMANDS_METAVAR
else:
subcommand_metavar = SUBCOMMAND_METAVAR
self.subcommand_metavar = subcommand_metavar
self.chain = chain
#: The result callback that is stored. This can be set or
#: overridden with the :func:`resultcallback` decorator.
self.result_callback = result_callback
if self.chain:
for param in self.params:
if isinstance(param, Argument) and not param.required:
raise RuntimeError('Multi commands in chain mode cannot '
'have optional arguments.')
def collect_usage_pieces(self, ctx):
rv = Command.collect_usage_pieces(self, ctx)
rv.append(self.subcommand_metavar)
return rv
def format_options(self, ctx, formatter):
Command.format_options(self, ctx, formatter)
self.format_commands(ctx, formatter)
def resultcallback(self, replace=False):
"""Adds a result callback to the chain command. By default if a
result callback is already registered this will chain them but
this can be disabled with the `replace` parameter. The result
callback is invoked with the return value of the subcommand
(or the list of return values from all subcommands if chaining