510 lines
21 KiB
Python
510 lines
21 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2014-2016 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Contains the Command class, a skeleton for a command."""
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import inspect
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import collections
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import traceback
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from PyQt5.QtWebKit import QWebSettings
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from qutebrowser.commands import cmdexc, argparser
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from qutebrowser.utils import log, utils, message, docutils, objreg, usertypes
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from qutebrowser.utils import debug as debug_utils
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def arg_name(name):
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"""Get the name an argument should have based on its Python name."""
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return name.rstrip('_').replace('_', '-')
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class Command:
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"""Base skeleton for a command.
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Attributes:
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name: The main name of the command.
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maxsplit: The maximum amount of splits to do for the commandline, or
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None.
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hide: Whether to hide the arguments or not.
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deprecated: False, or a string to describe why a command is deprecated.
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desc: The description of the command.
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handler: The handler function to call.
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completion: Completions to use for arguments, as a list of strings.
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debug: Whether this is a debugging command (only shown with --debug).
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parser: The ArgumentParser to use to parse this command.
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count_arg: The name of the count parameter, or None.
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win_id_arg: The name of the win_id parameter, or None.
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flags_with_args: A list of flags which take an argument.
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no_cmd_split: If true, ';;' to split sub-commands is ignored.
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_flags: A mapping of argument names to alternative flags
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_type_conv: A mapping of conversion functions for arguments.
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_needs_js: Whether the command needs javascript enabled
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_modes: The modes the command can be executed in.
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_not_modes: The modes the command can not be executed in.
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_count: The count set for the command.
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_instance: The object to bind 'self' to.
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_scope: The scope to get _instance for in the object registry.
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Class attributes:
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AnnotationInfo: Named tuple for info from an annotation.
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"""
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AnnotationInfo = collections.namedtuple(
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'AnnotationInfo', ['type', 'hide', 'metavar'])
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def __init__(self, *, handler, name, instance=None, maxsplit=None,
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hide=False, completion=None, modes=None, not_modes=None,
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needs_js=False, debug=False, ignore_args=False,
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deprecated=False, no_cmd_split=False, flags=None,
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star_args_optional=False, scope='global', count=None,
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win_id=None):
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# I really don't know how to solve this in a better way, I tried.
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# pylint: disable=too-many-locals
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if modes is not None and not_modes is not None:
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raise ValueError("Only modes or not_modes can be given!")
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if modes is not None:
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for m in modes:
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if not isinstance(m, usertypes.KeyMode):
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raise TypeError("Mode {} is no KeyMode member!".format(m))
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if not_modes is not None:
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for m in not_modes:
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if not isinstance(m, usertypes.KeyMode):
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raise TypeError("Mode {} is no KeyMode member!".format(m))
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if scope != 'global' and instance is None:
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raise ValueError("Setting scope without setting instance makes "
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"no sense!")
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self.name = name
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self.maxsplit = maxsplit
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self.hide = hide
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self.deprecated = deprecated
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self._instance = instance
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self.completion = completion
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self._modes = modes
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self._not_modes = not_modes
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self._scope = scope
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self._needs_js = needs_js
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self._star_args_optional = star_args_optional
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self._flags = flags or {}
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self.debug = debug
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self.ignore_args = ignore_args
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self.handler = handler
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self.no_cmd_split = no_cmd_split
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self.count_arg = count
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self.win_id_arg = win_id
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self.docparser = docutils.DocstringParser(handler)
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self.parser = argparser.ArgumentParser(
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name, description=self.docparser.short_desc,
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epilog=self.docparser.long_desc)
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self.parser.add_argument('-h', '--help', action=argparser.HelpAction,
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default=argparser.SUPPRESS, nargs=0,
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help=argparser.SUPPRESS)
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self._check_func()
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self.opt_args = collections.OrderedDict()
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self.namespace = None
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self._count = None
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self.pos_args = []
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self.desc = None
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self.flags_with_args = []
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self._type_conv = {}
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args = self._inspect_func()
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if self.completion is not None and len(self.completion) > len(args):
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raise ValueError("Got {} completions, but only {} "
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"arguments!".format(len(self.completion),
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len(args)))
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for argname in self._flags:
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if argname not in args:
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raise ValueError("Got argument {} in flags param, but no such "
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"argument exists for {}".format(
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argname, self.name))
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def _check_prerequisites(self, win_id):
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"""Check if the command is permitted to run currently.
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Args:
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win_id: The window ID the command is run in.
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"""
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mode_manager = objreg.get('mode-manager', scope='window',
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window=win_id)
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curmode = mode_manager.mode
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if self._modes is not None and curmode not in self._modes:
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mode_names = '/'.join(mode.name for mode in self._modes)
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raise cmdexc.PrerequisitesError(
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"{}: This command is only allowed in {} mode.".format(
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self.name, mode_names))
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elif self._not_modes is not None and curmode in self._not_modes:
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mode_names = '/'.join(mode.name for mode in self._not_modes)
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raise cmdexc.PrerequisitesError(
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"{}: This command is not allowed in {} mode.".format(
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self.name, mode_names))
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if self._needs_js and not QWebSettings.globalSettings().testAttribute(
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QWebSettings.JavascriptEnabled):
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raise cmdexc.PrerequisitesError(
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"{}: This command needs javascript enabled.".format(self.name))
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if self.deprecated:
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message.warning(win_id, '{} is deprecated - {}'.format(
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self.name, self.deprecated))
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def _check_func(self):
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"""Make sure the function parameters don't violate any rules."""
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signature = inspect.signature(self.handler)
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if 'self' in signature.parameters and self._instance is None:
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raise TypeError("{} is a class method, but instance was not "
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"given!".format(self.name[0]))
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elif 'self' not in signature.parameters and self._instance is not None:
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raise TypeError("{} is not a class method, but instance was "
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"given!".format(self.name[0]))
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elif any(param.kind == inspect.Parameter.VAR_KEYWORD
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for param in signature.parameters.values()):
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raise TypeError("{}: functions with varkw arguments are not "
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"supported!".format(self.name[0]))
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def _get_typeconv(self, param, typ):
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"""Get a dict with a type conversion for the parameter.
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Args:
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param: The inspect.Parameter to handle.
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typ: The type of the parameter.
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"""
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type_conv = {}
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if utils.is_enum(typ):
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type_conv[param.name] = argparser.enum_getter(typ)
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elif isinstance(typ, tuple):
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if param.default is not inspect.Parameter.empty:
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typ = typ + (type(param.default),)
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type_conv[param.name] = argparser.multitype_conv(typ)
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return type_conv
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def _inspect_special_param(self, param):
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"""Check if the given parameter is a special one.
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Args:
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param: The inspect.Parameter to handle.
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Return:
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True if the parameter is special, False otherwise.
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"""
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if param.name == self.count_arg:
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if param.default is inspect.Parameter.empty:
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raise TypeError("{}: handler has count parameter "
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"without default!".format(self.name))
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return True
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elif param.name == self.win_id_arg:
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return True
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def _inspect_func(self):
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"""Inspect the function to get useful informations from it.
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Sets instance attributes (desc, type_conv, name_conv) based on the
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informations.
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Return:
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How many user-visible arguments the command has.
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"""
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signature = inspect.signature(self.handler)
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doc = inspect.getdoc(self.handler)
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if doc is not None:
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self.desc = doc.splitlines()[0].strip()
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else:
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self.desc = ""
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if (self.count_arg is not None and
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self.count_arg not in signature.parameters):
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raise ValueError("count parameter {} does not exist!".format(
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self.count_arg))
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if (self.win_id_arg is not None and
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self.win_id_arg not in signature.parameters):
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raise ValueError("win_id parameter {} does not exist!".format(
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self.win_id_arg))
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if not self.ignore_args:
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for param in signature.parameters.values():
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annotation_info = self._parse_annotation(param)
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if param.name == 'self':
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continue
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if self._inspect_special_param(param):
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continue
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typ = self._get_type(param, annotation_info)
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kwargs = self._param_to_argparse_kwargs(param, annotation_info)
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args = self._param_to_argparse_args(param, annotation_info)
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self._type_conv.update(self._get_typeconv(param, typ))
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callsig = debug_utils.format_call(
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self.parser.add_argument, args, kwargs,
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full=False)
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log.commands.vdebug('Adding arg {} of type {} -> {}'.format(
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param.name, typ, callsig))
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self.parser.add_argument(*args, **kwargs)
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return signature.parameters.keys()
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def _param_to_argparse_kwargs(self, param, annotation_info):
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"""Get argparse keyword arguments for a parameter.
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Args:
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param: The inspect.Parameter object to get the args for.
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annotation_info: An AnnotationInfo tuple for the parameter.
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Return:
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A kwargs dict.
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"""
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kwargs = {}
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typ = self._get_type(param, annotation_info)
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try:
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kwargs['help'] = self.docparser.arg_descs[param.name]
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except KeyError:
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pass
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kwargs['dest'] = param.name
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if isinstance(typ, tuple):
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kwargs['metavar'] = annotation_info.metavar or param.name
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elif utils.is_enum(typ):
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kwargs['choices'] = [arg_name(e.name) for e in typ]
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kwargs['metavar'] = annotation_info.metavar or param.name
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elif typ is bool:
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kwargs['action'] = 'store_true'
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elif typ is not None:
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kwargs['type'] = typ
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if param.kind == inspect.Parameter.VAR_POSITIONAL:
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kwargs['nargs'] = '*' if self._star_args_optional else '+'
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elif param.kind == inspect.Parameter.KEYWORD_ONLY:
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kwargs['default'] = param.default
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elif typ is not bool and param.default is not inspect.Parameter.empty:
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kwargs['default'] = param.default
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kwargs['nargs'] = '?'
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return kwargs
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def _param_to_argparse_args(self, param, annotation_info):
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"""Get argparse positional arguments for a parameter.
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Args:
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param: The inspect.Parameter object to get the args for.
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annotation_info: An AnnotationInfo tuple for the parameter.
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Return:
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A list of args.
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"""
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args = []
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name = arg_name(param.name)
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shortname = self._flags.get(param.name, name[0])
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if len(shortname) != 1:
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raise ValueError("Flag '{}' of parameter {} (command {}) must be "
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"exactly 1 char!".format(shortname, name,
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self.name))
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typ = self._get_type(param, annotation_info)
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if typ is bool or param.kind == inspect.Parameter.KEYWORD_ONLY:
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long_flag = '--{}'.format(name)
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short_flag = '-{}'.format(shortname)
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args.append(long_flag)
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args.append(short_flag)
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self.opt_args[param.name] = long_flag, short_flag
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if typ is not bool:
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self.flags_with_args += [short_flag, long_flag]
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else:
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if not annotation_info.hide:
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self.pos_args.append((param.name, name))
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return args
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def _parse_annotation(self, param):
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"""Get argparse arguments and type from a parameter annotation.
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Args:
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param: A inspect.Parameter instance.
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Return:
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An AnnotationInfo namedtuple.
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typ: The type to use for this argument.
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name: The long name if overridden.
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"""
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info = {'type': None, 'hide': False, 'metavar': None}
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if param.annotation is not inspect.Parameter.empty:
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log.commands.vdebug("Parsing annotation {}".format(
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param.annotation))
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for field in ('type', 'name', 'hide', 'metavar'):
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if field in param.annotation:
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info[field] = param.annotation[field]
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return self.AnnotationInfo(**info)
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def _get_type(self, param, annotation_info):
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"""Get the type of an argument from its default value or annotation.
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Args:
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param: The inspect.Parameter to look at.
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annotation_info: An AnnotationInfo tuple which overrides the type.
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"""
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if annotation_info.type is not None:
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return annotation_info.type
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elif param.default is None or param.default is inspect.Parameter.empty:
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return None
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else:
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return type(param.default)
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def _get_self_arg(self, win_id, param, args):
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"""Get the self argument for a function call.
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Arguments:
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win_id: The window id this command should be executed in.
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param: The count parameter.
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args: The positional argument list. Gets modified directly.
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"""
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assert param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD
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if self._scope == 'global':
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tab_id = None
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win_id = None
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elif self._scope == 'tab':
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tab_id = 'current'
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elif self._scope == 'window':
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tab_id = None
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else:
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raise ValueError("Invalid scope {}!".format(self._scope))
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obj = objreg.get(self._instance, scope=self._scope, window=win_id,
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tab=tab_id)
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args.append(obj)
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def _get_count_arg(self, param, args, kwargs):
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"""Add the count argument to a function call.
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Arguments:
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param: The count parameter.
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args: The positional argument list. Gets modified directly.
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kwargs: The keyword argument dict. Gets modified directly.
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"""
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if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD:
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if self._count is not None:
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args.append(self._count)
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else:
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args.append(param.default)
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elif param.kind == inspect.Parameter.KEYWORD_ONLY:
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if self._count is not None:
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kwargs[param.name] = self._count
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else:
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raise TypeError("{}: invalid parameter type {} for argument "
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"{!r}!".format(self.name, param.kind, param.name))
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def _get_win_id_arg(self, win_id, param, args, kwargs):
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"""Add the win_id argument to a function call.
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Arguments:
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win_id: The window ID to add.
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param: The count parameter.
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args: The positional argument list. Gets modified directly.
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kwargs: The keyword argument dict. Gets modified directly.
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"""
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if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD:
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args.append(win_id)
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elif param.kind == inspect.Parameter.KEYWORD_ONLY:
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kwargs[param.name] = win_id
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else:
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raise TypeError("{}: invalid parameter type {} for argument "
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"{!r}!".format(self.name, param.kind, param.name))
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def _get_param_value(self, param):
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"""Get the converted value for an inspect.Parameter."""
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value = getattr(self.namespace, param.name)
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if param.name in self._type_conv:
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# We convert enum types after getting the values from
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# argparse, because argparse's choices argument is
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# processed after type conversation, which is not what we
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# want.
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value = self._type_conv[param.name](value)
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return value
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def _get_call_args(self, win_id):
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"""Get arguments for a function call.
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Args:
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win_id: The window id this command should be executed in.
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Return:
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An (args, kwargs) tuple.
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"""
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args = []
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kwargs = {}
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signature = inspect.signature(self.handler)
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if self.ignore_args:
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if self._instance is not None:
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param = list(signature.parameters.values())[0]
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self._get_self_arg(win_id, param, args)
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return args, kwargs
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for i, param in enumerate(signature.parameters.values()):
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if i == 0 and self._instance is not None:
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# Special case for 'self'.
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self._get_self_arg(win_id, param, args)
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continue
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elif param.name == self.count_arg:
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# Special case for count parameter.
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self._get_count_arg(param, args, kwargs)
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continue
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elif param.name == self.win_id_arg:
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# Special case for win_id parameter.
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self._get_win_id_arg(win_id, param, args, kwargs)
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continue
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value = self._get_param_value(param)
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if param.kind == inspect.Parameter.POSITIONAL_OR_KEYWORD:
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args.append(value)
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elif param.kind == inspect.Parameter.VAR_POSITIONAL:
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if value is not None:
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args += value
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elif param.kind == inspect.Parameter.KEYWORD_ONLY:
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kwargs[param.name] = value
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else:
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raise TypeError("{}: Invalid parameter type {} for argument "
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"'{}'!".format(
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self.name, param.kind, param.name))
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return args, kwargs
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def run(self, win_id, args=None, count=None):
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"""Run the command.
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Note we don't catch CommandError here as it might happen async.
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Args:
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win_id: The window ID the command is run in.
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args: Arguments to the command.
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count: Command repetition count.
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"""
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dbgout = ["command called:", self.name]
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if args:
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dbgout.append(str(args))
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if count is not None:
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dbgout.append("(count={})".format(count))
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log.commands.debug(' '.join(dbgout))
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try:
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self.namespace = self.parser.parse_args(args)
|
|
except argparser.ArgumentParserError as e:
|
|
message.error(win_id, '{}: {}'.format(self.name, e),
|
|
stack=traceback.format_exc())
|
|
return
|
|
except argparser.ArgumentParserExit as e:
|
|
log.commands.debug("argparser exited with status {}: {}".format(
|
|
e.status, e))
|
|
return
|
|
self._count = count
|
|
posargs, kwargs = self._get_call_args(win_id)
|
|
self._check_prerequisites(win_id)
|
|
log.commands.debug('Calling {}'.format(
|
|
debug_utils.format_call(self.handler, posargs, kwargs)))
|
|
self.handler(*posargs, **kwargs)
|