305 lines
11 KiB
Python
305 lines
11 KiB
Python
import sys
|
|
import inspect
|
|
|
|
from functools import update_wrapper
|
|
|
|
from ._compat import iteritems
|
|
from ._unicodefun import _check_for_unicode_literals
|
|
from .utils import echo
|
|
from .globals import get_current_context
|
|
|
|
|
|
def pass_context(f):
|
|
"""Marks a callback as wanting to receive the current context
|
|
object as first argument.
|
|
"""
|
|
def new_func(*args, **kwargs):
|
|
return f(get_current_context(), *args, **kwargs)
|
|
return update_wrapper(new_func, f)
|
|
|
|
|
|
def pass_obj(f):
|
|
"""Similar to :func:`pass_context`, but only pass the object on the
|
|
context onwards (:attr:`Context.obj`). This is useful if that object
|
|
represents the state of a nested system.
|
|
"""
|
|
def new_func(*args, **kwargs):
|
|
return f(get_current_context().obj, *args, **kwargs)
|
|
return update_wrapper(new_func, f)
|
|
|
|
|
|
def make_pass_decorator(object_type, ensure=False):
|
|
"""Given an object type this creates a decorator that will work
|
|
similar to :func:`pass_obj` but instead of passing the object of the
|
|
current context, it will find the innermost context of type
|
|
:func:`object_type`.
|
|
|
|
This generates a decorator that works roughly like this::
|
|
|
|
from functools import update_wrapper
|
|
|
|
def decorator(f):
|
|
@pass_context
|
|
def new_func(ctx, *args, **kwargs):
|
|
obj = ctx.find_object(object_type)
|
|
return ctx.invoke(f, obj, *args, **kwargs)
|
|
return update_wrapper(new_func, f)
|
|
return decorator
|
|
|
|
:param object_type: the type of the object to pass.
|
|
:param ensure: if set to `True`, a new object will be created and
|
|
remembered on the context if it's not there yet.
|
|
"""
|
|
def decorator(f):
|
|
def new_func(*args, **kwargs):
|
|
ctx = get_current_context()
|
|
if ensure:
|
|
obj = ctx.ensure_object(object_type)
|
|
else:
|
|
obj = ctx.find_object(object_type)
|
|
if obj is None:
|
|
raise RuntimeError('Managed to invoke callback without a '
|
|
'context object of type %r existing'
|
|
% object_type.__name__)
|
|
return ctx.invoke(f, obj, *args[1:], **kwargs)
|
|
return update_wrapper(new_func, f)
|
|
return decorator
|
|
|
|
|
|
def _make_command(f, name, attrs, cls):
|
|
if isinstance(f, Command):
|
|
raise TypeError('Attempted to convert a callback into a '
|
|
'command twice.')
|
|
try:
|
|
params = f.__click_params__
|
|
params.reverse()
|
|
del f.__click_params__
|
|
except AttributeError:
|
|
params = []
|
|
help = attrs.get('help')
|
|
if help is None:
|
|
help = inspect.getdoc(f)
|
|
if isinstance(help, bytes):
|
|
help = help.decode('utf-8')
|
|
else:
|
|
help = inspect.cleandoc(help)
|
|
attrs['help'] = help
|
|
_check_for_unicode_literals()
|
|
return cls(name=name or f.__name__.lower(),
|
|
callback=f, params=params, **attrs)
|
|
|
|
|
|
def command(name=None, cls=None, **attrs):
|
|
"""Creates a new :class:`Command` and uses the decorated function as
|
|
callback. This will also automatically attach all decorated
|
|
:func:`option`\s and :func:`argument`\s as parameters to the command.
|
|
|
|
The name of the command defaults to the name of the function. If you
|
|
want to change that, you can pass the intended name as the first
|
|
argument.
|
|
|
|
All keyword arguments are forwarded to the underlying command class.
|
|
|
|
Once decorated the function turns into a :class:`Command` instance
|
|
that can be invoked as a command line utility or be attached to a
|
|
command :class:`Group`.
|
|
|
|
:param name: the name of the command. This defaults to the function
|
|
name.
|
|
:param cls: the command class to instantiate. This defaults to
|
|
:class:`Command`.
|
|
"""
|
|
if cls is None:
|
|
cls = Command
|
|
def decorator(f):
|
|
cmd = _make_command(f, name, attrs, cls)
|
|
cmd.__doc__ = f.__doc__
|
|
return cmd
|
|
return decorator
|
|
|
|
|
|
def group(name=None, **attrs):
|
|
"""Creates a new :class:`Group` with a function as callback. This
|
|
works otherwise the same as :func:`command` just that the `cls`
|
|
parameter is set to :class:`Group`.
|
|
"""
|
|
attrs.setdefault('cls', Group)
|
|
return command(name, **attrs)
|
|
|
|
|
|
def _param_memo(f, param):
|
|
if isinstance(f, Command):
|
|
f.params.append(param)
|
|
else:
|
|
if not hasattr(f, '__click_params__'):
|
|
f.__click_params__ = []
|
|
f.__click_params__.append(param)
|
|
|
|
|
|
def argument(*param_decls, **attrs):
|
|
"""Attaches an argument to the command. All positional arguments are
|
|
passed as parameter declarations to :class:`Argument`; all keyword
|
|
arguments are forwarded unchanged (except ``cls``).
|
|
This is equivalent to creating an :class:`Argument` instance manually
|
|
and attaching it to the :attr:`Command.params` list.
|
|
|
|
:param cls: the argument class to instantiate. This defaults to
|
|
:class:`Argument`.
|
|
"""
|
|
def decorator(f):
|
|
ArgumentClass = attrs.pop('cls', Argument)
|
|
_param_memo(f, ArgumentClass(param_decls, **attrs))
|
|
return f
|
|
return decorator
|
|
|
|
|
|
def option(*param_decls, **attrs):
|
|
"""Attaches an option to the command. All positional arguments are
|
|
passed as parameter declarations to :class:`Option`; all keyword
|
|
arguments are forwarded unchanged (except ``cls``).
|
|
This is equivalent to creating an :class:`Option` instance manually
|
|
and attaching it to the :attr:`Command.params` list.
|
|
|
|
:param cls: the option class to instantiate. This defaults to
|
|
:class:`Option`.
|
|
"""
|
|
def decorator(f):
|
|
if 'help' in attrs:
|
|
attrs['help'] = inspect.cleandoc(attrs['help'])
|
|
OptionClass = attrs.pop('cls', Option)
|
|
_param_memo(f, OptionClass(param_decls, **attrs))
|
|
return f
|
|
return decorator
|
|
|
|
|
|
def confirmation_option(*param_decls, **attrs):
|
|
"""Shortcut for confirmation prompts that can be ignored by passing
|
|
``--yes`` as parameter.
|
|
|
|
This is equivalent to decorating a function with :func:`option` with
|
|
the following parameters::
|
|
|
|
def callback(ctx, param, value):
|
|
if not value:
|
|
ctx.abort()
|
|
|
|
@click.command()
|
|
@click.option('--yes', is_flag=True, callback=callback,
|
|
expose_value=False, prompt='Do you want to continue?')
|
|
def dropdb():
|
|
pass
|
|
"""
|
|
def decorator(f):
|
|
def callback(ctx, param, value):
|
|
if not value:
|
|
ctx.abort()
|
|
attrs.setdefault('is_flag', True)
|
|
attrs.setdefault('callback', callback)
|
|
attrs.setdefault('expose_value', False)
|
|
attrs.setdefault('prompt', 'Do you want to continue?')
|
|
attrs.setdefault('help', 'Confirm the action without prompting.')
|
|
return option(*(param_decls or ('--yes',)), **attrs)(f)
|
|
return decorator
|
|
|
|
|
|
def password_option(*param_decls, **attrs):
|
|
"""Shortcut for password prompts.
|
|
|
|
This is equivalent to decorating a function with :func:`option` with
|
|
the following parameters::
|
|
|
|
@click.command()
|
|
@click.option('--password', prompt=True, confirmation_prompt=True,
|
|
hide_input=True)
|
|
def changeadmin(password):
|
|
pass
|
|
"""
|
|
def decorator(f):
|
|
attrs.setdefault('prompt', True)
|
|
attrs.setdefault('confirmation_prompt', True)
|
|
attrs.setdefault('hide_input', True)
|
|
return option(*(param_decls or ('--password',)), **attrs)(f)
|
|
return decorator
|
|
|
|
|
|
def version_option(version=None, *param_decls, **attrs):
|
|
"""Adds a ``--version`` option which immediately ends the program
|
|
printing out the version number. This is implemented as an eager
|
|
option that prints the version and exits the program in the callback.
|
|
|
|
:param version: the version number to show. If not provided Click
|
|
attempts an auto discovery via setuptools.
|
|
:param prog_name: the name of the program (defaults to autodetection)
|
|
:param message: custom message to show instead of the default
|
|
(``'%(prog)s, version %(version)s'``)
|
|
:param others: everything else is forwarded to :func:`option`.
|
|
"""
|
|
if version is None:
|
|
module = sys._getframe(1).f_globals.get('__name__')
|
|
def decorator(f):
|
|
prog_name = attrs.pop('prog_name', None)
|
|
message = attrs.pop('message', '%(prog)s, version %(version)s')
|
|
|
|
def callback(ctx, param, value):
|
|
if not value or ctx.resilient_parsing:
|
|
return
|
|
prog = prog_name
|
|
if prog is None:
|
|
prog = ctx.find_root().info_name
|
|
ver = version
|
|
if ver is None:
|
|
try:
|
|
import pkg_resources
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
for dist in pkg_resources.working_set:
|
|
scripts = dist.get_entry_map().get('console_scripts') or {}
|
|
for script_name, entry_point in iteritems(scripts):
|
|
if entry_point.module_name == module:
|
|
ver = dist.version
|
|
break
|
|
if ver is None:
|
|
raise RuntimeError('Could not determine version')
|
|
echo(message % {
|
|
'prog': prog,
|
|
'version': ver,
|
|
}, color=ctx.color)
|
|
ctx.exit()
|
|
|
|
attrs.setdefault('is_flag', True)
|
|
attrs.setdefault('expose_value', False)
|
|
attrs.setdefault('is_eager', True)
|
|
attrs.setdefault('help', 'Show the version and exit.')
|
|
attrs['callback'] = callback
|
|
return option(*(param_decls or ('--version',)), **attrs)(f)
|
|
return decorator
|
|
|
|
|
|
def help_option(*param_decls, **attrs):
|
|
"""Adds a ``--help`` option which immediately ends the program
|
|
printing out the help page. This is usually unnecessary to add as
|
|
this is added by default to all commands unless suppressed.
|
|
|
|
Like :func:`version_option`, this is implemented as eager option that
|
|
prints in the callback and exits.
|
|
|
|
All arguments are forwarded to :func:`option`.
|
|
"""
|
|
def decorator(f):
|
|
def callback(ctx, param, value):
|
|
if value and not ctx.resilient_parsing:
|
|
echo(ctx.get_help(), color=ctx.color)
|
|
ctx.exit()
|
|
attrs.setdefault('is_flag', True)
|
|
attrs.setdefault('expose_value', False)
|
|
attrs.setdefault('help', 'Show this message and exit.')
|
|
attrs.setdefault('is_eager', True)
|
|
attrs['callback'] = callback
|
|
return option(*(param_decls or ('--help',)), **attrs)(f)
|
|
return decorator
|
|
|
|
|
|
# Circular dependencies between core and decorators
|
|
from .core import Command, Group, Argument, Option
|