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""" 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, **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().replace('_', '-'), callback=f, params=params, **attrs) def command(name=None, cls=None, **attrs): r"""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 with underscores replaced by dashes. :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): # Issue 926, copy attrs, so pre-defined options can re-use the same cls= option_attrs = attrs.copy() if 'help' in option_attrs: option_attrs['help'] = inspect.cleandoc(option_attrs['help']) OptionClass = option_attrs.pop('cls', Option) _param_memo(f, OptionClass(param_decls, **option_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: if hasattr(sys, '_getframe'): module = sys._getframe(1).f_globals.get('__name__') else: module = '' 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