661 lines
24 KiB
Python
661 lines
24 KiB
Python
# SPDX-FileCopyrightText: Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# SPDX-License-Identifier: GPL-3.0-or-later
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"""Configuration storage and config-related utilities."""
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import copy
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import contextlib
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import functools
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from typing import (TYPE_CHECKING, Any, Callable, Dict, Iterator, List, Mapping,
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MutableMapping, MutableSequence, Optional, Tuple, cast)
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from qutebrowser.qt.core import pyqtSignal, QObject, QUrl
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from qutebrowser.commands import cmdexc, parser
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from qutebrowser.config import configdata, configexc, configutils
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from qutebrowser.utils import utils, log, urlmatch
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from qutebrowser.misc import objects
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from qutebrowser.keyinput import keyutils
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if TYPE_CHECKING:
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from qutebrowser.config import configcache, configfiles
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from qutebrowser.misc import savemanager
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# An easy way to access the config from other code via config.val.foo
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val = cast('ConfigContainer', None)
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instance = cast('Config', None)
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key_instance = cast('KeyConfig', None)
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cache = cast('configcache.ConfigCache', None)
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# Keeping track of all change filters to validate them later.
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change_filters = []
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# Sentinel
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UNSET = object()
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class change_filter: # noqa: N801,N806 pylint: disable=invalid-name
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"""Decorator to filter calls based on a config section/option matching.
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This could also be a function, but as a class (with a "wrong" name) it's
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much cleaner to implement.
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Attributes:
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_option: An option or prefix to be filtered
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_function: Whether a function rather than a method is decorated.
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"""
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def __init__(self, option: str, function: bool = False) -> None:
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"""Save decorator arguments.
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Gets called on parse-time with the decorator arguments.
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Args:
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option: The option to be filtered.
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function: Whether a function rather than a method is decorated.
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"""
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self._option = option
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self._function = function
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change_filters.append(self)
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def validate(self) -> None:
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"""Make sure the configured option or prefix exists.
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We can't do this in __init__ as configdata isn't ready yet.
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"""
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if (self._option not in configdata.DATA and
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not configdata.is_valid_prefix(self._option)):
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raise configexc.NoOptionError(self._option)
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def check_match(self, option: Optional[str]) -> bool:
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"""Check if the given option matches the filter."""
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if option is None:
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# Called directly, not from a config change event.
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return True
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elif option == self._option:
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return True
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elif option.startswith(self._option + '.'):
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# prefix match
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return True
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else:
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return False
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def __call__(
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self,
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func: Callable[..., None],
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) -> Callable[..., None]:
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"""Filter calls to the decorated function.
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Gets called when a function should be decorated.
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Adds a filter which returns if we're not interested in the change-event
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and calls the wrapped function if we are.
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We assume the function passed doesn't take any parameters. However, it
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could take a "self" argument, so we can't clearly express this in the
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type above.
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Args:
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func: The function to be decorated.
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Return:
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The decorated function.
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"""
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if self._function:
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@functools.wraps(func)
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def func_wrapper(option: str = None) -> Any:
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"""Call the underlying function."""
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if self.check_match(option):
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return func()
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return None
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return func_wrapper
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else:
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@functools.wraps(func)
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def meth_wrapper(wrapper_self: Any, option: str = None) -> Any:
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"""Call the underlying function."""
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if self.check_match(option):
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return func(wrapper_self)
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return None
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return meth_wrapper
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class KeyConfig:
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"""Utilities related to keybindings.
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Note that the actual values are saved in the config itself, not here.
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Attributes:
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_config: The Config object to be used.
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"""
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_ReverseBindings = Dict[str, MutableSequence[str]]
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def __init__(self, config: 'Config') -> None:
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self._config = config
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def _validate(self, key: keyutils.KeySequence, mode: str) -> None:
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"""Validate the given key and mode."""
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# Catch old usage of this code
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assert isinstance(key, keyutils.KeySequence), key
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if mode not in configdata.DATA['bindings.default'].default:
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raise configexc.KeybindingError("Invalid mode {}!".format(mode))
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def get_bindings_for(self, mode: str) -> Dict[keyutils.KeySequence, str]:
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"""Get the combined bindings for the given mode."""
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bindings = dict(val.bindings.default[mode])
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for key, binding in val.bindings.commands[mode].items():
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if not binding:
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bindings.pop(key, None)
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else:
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bindings[key] = binding
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return bindings
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def _implied_cmd(self, cmdline: str) -> Optional[str]:
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"""Return cmdline, or the implied cmd if cmdline is a set-cmd-text."""
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try:
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results = parser.CommandParser().parse_all(cmdline)
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except cmdexc.NoSuchCommandError:
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return None
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result = results[0]
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if result.cmd.name != "set-cmd-text":
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return cmdline
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if not result.args:
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return None # doesn't look like this sets a command
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*flags, cmd = result.args
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if "-a" in flags or "--append" in flags or not cmd.startswith(":"):
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return None # doesn't look like this sets a command
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return cmd.lstrip(":")
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def get_reverse_bindings_for(self, mode: str) -> '_ReverseBindings':
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"""Get a dict of commands to a list of bindings for the mode.
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This is intended for user-facing display of keybindings.
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As such, bindings for 'set-cmd-text [flags] :<cmd> ...' are translated
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to '<cmd> ...', as from the user's perspective these keys behave like
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bindings for '<cmd>' (that allow for further input before running).
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See #5942.
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"""
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cmd_to_keys: KeyConfig._ReverseBindings = {}
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bindings = self.get_bindings_for(mode)
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for seq, full_cmd in sorted(bindings.items()):
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for cmdtext in full_cmd.split(';;'):
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cmd = self._implied_cmd(cmdtext.strip())
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if not cmd:
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continue
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cmd_to_keys.setdefault(cmd, [])
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# Put bindings involving modifiers last
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if any(info.modifiers for info in seq):
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cmd_to_keys[cmd].append(str(seq))
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else:
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cmd_to_keys[cmd].insert(0, str(seq))
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return cmd_to_keys
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def get_command(self,
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key: keyutils.KeySequence,
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mode: str,
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default: bool = False) -> Optional[str]:
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"""Get the command for a given key (or None)."""
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self._validate(key, mode)
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if default:
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bindings = dict(val.bindings.default[mode])
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else:
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bindings = self.get_bindings_for(mode)
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return bindings.get(key, None)
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def bind(self,
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key: keyutils.KeySequence,
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command: str, *,
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mode: str,
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save_yaml: bool = False) -> None:
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"""Add a new binding from key to command."""
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if not command.strip():
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raise configexc.KeybindingError(
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"Can't add binding '{}' with empty command in {} "
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'mode'.format(key, mode))
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self._validate(key, mode)
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log.keyboard.vdebug( # type: ignore[attr-defined]
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"Adding binding {} -> {} in mode {}.".format(key, command, mode))
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bindings = self._config.get_mutable_obj('bindings.commands')
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if mode not in bindings:
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bindings[mode] = {}
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bindings[mode][str(key)] = command
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self._config.update_mutables(save_yaml=save_yaml)
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def bind_default(self,
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key: keyutils.KeySequence, *,
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mode: str = 'normal',
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save_yaml: bool = False) -> None:
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"""Restore a default keybinding."""
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self._validate(key, mode)
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bindings_commands = self._config.get_mutable_obj('bindings.commands')
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try:
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del bindings_commands[mode][str(key)]
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except KeyError:
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raise configexc.KeybindingError(
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"Can't find binding '{}' in {} mode".format(key, mode))
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self._config.update_mutables(save_yaml=save_yaml)
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def unbind(self,
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key: keyutils.KeySequence, *,
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mode: str = 'normal',
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save_yaml: bool = False) -> None:
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"""Unbind the given key in the given mode."""
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self._validate(key, mode)
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bindings_commands = self._config.get_mutable_obj('bindings.commands')
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if val.bindings.commands[mode].get(key, None) is not None:
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# In custom bindings -> remove it
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del bindings_commands[mode][str(key)]
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elif key in val.bindings.default[mode]:
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# In default bindings -> shadow it with None
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if mode not in bindings_commands:
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bindings_commands[mode] = {}
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bindings_commands[mode][str(key)] = None
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else:
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raise configexc.KeybindingError(
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"Can't find binding '{}' in {} mode".format(key, mode))
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self._config.update_mutables(save_yaml=save_yaml)
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class Config(QObject):
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"""Main config object.
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Class attributes:
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MUTABLE_TYPES: Types returned from the config which could potentially
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be mutated.
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Attributes:
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_values: A dict mapping setting names to configutils.Values objects.
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_mutables: A dictionary of mutable objects to be checked for changes.
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_yaml: A YamlConfig object or None.
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Signals:
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changed: Emitted with the option name when an option changed.
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"""
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MUTABLE_TYPES = (dict, list)
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changed = pyqtSignal(str)
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def __init__(self,
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yaml_config: 'configfiles.YamlConfig',
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parent: QObject = None) -> None:
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super().__init__(parent)
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self._mutables: MutableMapping[str, Tuple[Any, Any]] = {}
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self._yaml = yaml_config
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self._init_values()
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self.yaml_loaded = False
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self.config_py_loaded = False
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def _init_values(self) -> None:
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"""Populate the self._values dict."""
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self._values: Mapping[str, configutils.Values] = {}
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for name, opt in configdata.DATA.items():
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self._values[name] = configutils.Values(opt)
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def __iter__(self) -> Iterator[configutils.Values]:
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"""Iterate over configutils.Values items."""
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yield from self._values.values()
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def init_save_manager(self,
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save_manager: 'savemanager.SaveManager') -> None:
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"""Make sure the config gets saved properly.
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We do this outside of __init__ because the config gets created before
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the save_manager exists.
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"""
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self._yaml.init_save_manager(save_manager)
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def _set_value(self,
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opt: 'configdata.Option',
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value: Any,
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pattern: urlmatch.UrlPattern = None,
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hide_userconfig: bool = False) -> None:
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"""Set the given option to the given value."""
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if not isinstance(objects.backend, objects.NoBackend):
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if objects.backend not in opt.backends:
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raise configexc.BackendError(opt.name, objects.backend,
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opt.raw_backends)
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opt.typ.to_py(value) # for validation
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self._values[opt.name].add(opt.typ.from_obj(value),
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pattern, hide_userconfig=hide_userconfig)
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self.changed.emit(opt.name)
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log.config.debug("Config option changed: {} = {}".format(
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opt.name, value))
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def _check_yaml(self, opt: 'configdata.Option', save_yaml: bool) -> None:
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"""Make sure the given option may be set in autoconfig.yml."""
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if save_yaml and opt.no_autoconfig:
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raise configexc.NoAutoconfigError(opt.name)
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def read_yaml(self) -> None:
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"""Read the YAML settings from self._yaml."""
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self._yaml.load()
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self.yaml_loaded = True
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for values in self._yaml:
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for scoped in values:
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self._set_value(values.opt, scoped.value,
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pattern=scoped.pattern)
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def get_opt(self, name: str) -> 'configdata.Option':
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"""Get a configdata.Option object for the given setting."""
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try:
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return configdata.DATA[name]
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except KeyError:
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deleted = name in configdata.MIGRATIONS.deleted
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renamed = configdata.MIGRATIONS.renamed.get(name)
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exception = configexc.NoOptionError(
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name,
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deleted=deleted,
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renamed=renamed,
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all_names=list(configdata.DATA),
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)
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raise exception from None
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def ensure_has_opt(self, name: str) -> None:
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"""Raise NoOptionError if the given setting does not exist."""
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self.get_opt(name)
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def get(self,
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name: str,
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url: QUrl = None, *,
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fallback: bool = True) -> Any:
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"""Get the given setting converted for Python code.
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Args:
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name: The name of the setting to get.
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url: The URL to get the value for.
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fallback: Use the global value if there's no URL-specific one.
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"""
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opt = self.get_opt(name)
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obj = self.get_obj(name, url=url, fallback=fallback)
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return opt.typ.to_py(obj)
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def _maybe_copy(self, value: Any) -> Any:
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"""Copy the value if it could potentially be mutated."""
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if isinstance(value, self.MUTABLE_TYPES):
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# For mutable objects, create a copy so we don't accidentally
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# mutate the config's internal value.
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return copy.deepcopy(value)
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else:
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# Shouldn't be mutable (and thus hashable)
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assert value.__hash__ is not None, value
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return value
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def get_obj(self,
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name: str, *,
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url: QUrl = None,
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fallback: bool = True) -> Any:
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"""Get the given setting as object (for YAML/config.py).
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Note that the returned values are not watched for mutation.
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If a URL is given, return the value which should be used for that URL.
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"""
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self.ensure_has_opt(name)
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value = self._values[name].get_for_url(url, fallback=fallback)
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return self._maybe_copy(value)
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def get_obj_for_pattern(
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self, name: str, *,
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pattern: Optional[urlmatch.UrlPattern]
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) -> Any:
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"""Get the given setting as object (for YAML/config.py).
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This gets the overridden value for a given pattern, or
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usertypes.UNSET if no such override exists.
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"""
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self.ensure_has_opt(name)
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value = self._values[name].get_for_pattern(pattern, fallback=False)
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return self._maybe_copy(value)
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def get_mutable_obj(self, name: str, *,
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pattern: urlmatch.UrlPattern = None) -> Any:
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"""Get an object which can be mutated, e.g. in a config.py.
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If a pattern is given, return the value for that pattern.
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Note that it's impossible to get a mutable object for a URL as we
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wouldn't know what pattern to apply.
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"""
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self.ensure_has_opt(name)
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# If we allow mutation, there is a chance that prior mutations already
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# entered the mutable dictionary and thus further copies are unneeded
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# until update_mutables() is called
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if name in self._mutables:
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_copy, obj = self._mutables[name]
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return obj
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value = self._values[name].get_for_pattern(pattern)
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copy_value = self._maybe_copy(value)
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# Watch the returned object for changes if it's mutable.
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if isinstance(copy_value, self.MUTABLE_TYPES):
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self._mutables[name] = (value, copy_value) # old, new
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return copy_value
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def get_str(self, name: str, *,
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pattern: urlmatch.UrlPattern = None) -> str:
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"""Get the given setting as string.
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If a pattern is given, get the setting for the given pattern or
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usertypes.UNSET.
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"""
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opt = self.get_opt(name)
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values = self._values[name]
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value = values.get_for_pattern(pattern)
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return opt.typ.to_str(value)
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def set_obj(self, name: str,
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value: Any, *,
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pattern: urlmatch.UrlPattern = None,
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save_yaml: bool = False,
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hide_userconfig: bool = False) -> None:
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"""Set the given setting from a YAML/config.py object.
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If save_yaml=True is given, store the new value to YAML.
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If hide_userconfig=True is given, hide the value from
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dump_userconfig().
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"""
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opt = self.get_opt(name)
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self._check_yaml(opt, save_yaml)
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self._set_value(opt, value, pattern=pattern,
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hide_userconfig=hide_userconfig)
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if save_yaml:
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self._yaml.set_obj(name, value, pattern=pattern)
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def set_str(self, name: str,
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value: str, *,
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pattern: urlmatch.UrlPattern = None,
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save_yaml: bool = False) -> None:
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"""Set the given setting from a string.
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If save_yaml=True is given, store the new value to YAML.
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"""
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opt = self.get_opt(name)
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self._check_yaml(opt, save_yaml)
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converted = opt.typ.from_str(value)
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log.config.debug("Setting {} (type {}) to {!r} (converted from {!r})"
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.format(name, opt.typ.__class__.__name__, converted,
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value))
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self._set_value(opt, converted, pattern=pattern)
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if save_yaml:
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self._yaml.set_obj(name, converted, pattern=pattern)
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def unset(self, name: str, *,
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save_yaml: bool = False,
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pattern: urlmatch.UrlPattern = None) -> bool:
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"""Set the given setting back to its default.
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Return:
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True if there was a change, False if nothing changed.
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"""
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opt = self.get_opt(name)
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self._check_yaml(opt, save_yaml)
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changed = self._values[name].remove(pattern)
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if changed:
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self.changed.emit(name)
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if save_yaml:
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self._yaml.unset(name, pattern=pattern)
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return changed
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def clear(self, *, save_yaml: bool = False) -> None:
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"""Clear all settings in the config.
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|
|
|
If save_yaml=True is given, also remove all customization from the YAML
|
|
file.
|
|
"""
|
|
for name, values in self._values.items():
|
|
if values:
|
|
values.clear()
|
|
self.changed.emit(name)
|
|
|
|
if save_yaml:
|
|
self._yaml.clear()
|
|
|
|
def update_mutables(self, *, save_yaml: bool = False) -> None:
|
|
"""Update mutable settings if they changed.
|
|
|
|
Every time someone calls get_obj() on a mutable object, we save a
|
|
reference to the original object and a copy.
|
|
|
|
Here, we check all those saved copies for mutations, and if something
|
|
mutated, we call set_obj again so we save the new value.
|
|
"""
|
|
mutables = self._mutables.items()
|
|
self._mutables = {}
|
|
for name, (old_value, new_value) in mutables:
|
|
if old_value != new_value:
|
|
log.config.debug("{} was mutated, updating".format(name))
|
|
self.set_obj(name, new_value, save_yaml=save_yaml)
|
|
|
|
def dump_userconfig(self, *, include_hidden: bool = False) -> str:
|
|
"""Get the part of the config which was changed by the user.
|
|
|
|
Args:
|
|
include_hidden: Include default scoped configs.
|
|
|
|
Return:
|
|
The changed config part as string.
|
|
"""
|
|
lines: List[str] = []
|
|
for values in sorted(self, key=lambda v: v.opt.name):
|
|
lines += values.dump(include_hidden=include_hidden)
|
|
|
|
if not lines:
|
|
return '<Default configuration>'
|
|
|
|
return '\n'.join(lines)
|
|
|
|
|
|
class ConfigContainer:
|
|
|
|
"""An object implementing config access via __getattr__.
|
|
|
|
Attributes:
|
|
_config: The Config object.
|
|
_prefix: The __getattr__ chain leading up to this object.
|
|
_configapi: If given, get values suitable for config.py and
|
|
add errors to the given ConfigAPI object.
|
|
_pattern: The URL pattern to be used.
|
|
"""
|
|
|
|
def __init__(self, config: Config,
|
|
configapi: 'configfiles.ConfigAPI' = None,
|
|
prefix: str = '',
|
|
pattern: urlmatch.UrlPattern = None) -> None:
|
|
self._config = config
|
|
self._prefix = prefix
|
|
self._configapi = configapi
|
|
self._pattern = pattern
|
|
if configapi is None and pattern is not None:
|
|
raise TypeError("Can't use pattern without configapi!")
|
|
|
|
def __repr__(self) -> str:
|
|
return utils.get_repr(self, constructor=True, config=self._config,
|
|
configapi=self._configapi, prefix=self._prefix,
|
|
pattern=self._pattern)
|
|
|
|
@contextlib.contextmanager
|
|
def _handle_error(self, action: str) -> Iterator[None]:
|
|
try:
|
|
yield
|
|
except configexc.Error as e:
|
|
if self._configapi is None:
|
|
raise
|
|
text = f"While {action}"
|
|
self._configapi.errors.append(configexc.ConfigErrorDesc(text, e))
|
|
|
|
def _with_prefix(self, prefix: str) -> 'ConfigContainer':
|
|
"""Get a new ConfigContainer for the given prefix."""
|
|
return ConfigContainer(
|
|
config=self._config,
|
|
configapi=self._configapi,
|
|
pattern=self._pattern,
|
|
prefix=prefix,
|
|
)
|
|
|
|
def __getattr__(self, attr: str) -> Any:
|
|
"""Get an option or a new ConfigContainer with the added prefix.
|
|
|
|
If we get an option which exists, we return the value for it.
|
|
If we get a part of an option name, we return a new ConfigContainer.
|
|
|
|
Those two never overlap as configdata.py ensures there are no shadowing
|
|
options.
|
|
"""
|
|
if attr.startswith('_'):
|
|
return self.__getattribute__(attr)
|
|
|
|
name = self._join(attr)
|
|
if configdata.is_valid_prefix(name):
|
|
return self._with_prefix(name)
|
|
|
|
with self._handle_error(f"getting '{name}'"):
|
|
if self._configapi is None:
|
|
# access from Python code
|
|
return self._config.get(name)
|
|
else:
|
|
# access from config.py
|
|
return self._config.get_mutable_obj(
|
|
name, pattern=self._pattern)
|
|
|
|
# If we arrived here, there was an error while getting the config option. Most
|
|
# likely, someone did something like "c.content.host_blocking.lists" but
|
|
# "c.content.host_blocking" doesn't actually exist. To avoid an AttributeError
|
|
# which leads to a confusing error message, return another ConfigContainer so
|
|
# that the chain can keep going.
|
|
return self._with_prefix(name) # type: ignore[unreachable]
|
|
|
|
def __setattr__(self, attr: str, value: Any) -> None:
|
|
"""Set the given option in the config."""
|
|
if attr.startswith('_'):
|
|
super().__setattr__(attr, value)
|
|
return
|
|
|
|
name = self._join(attr)
|
|
with self._handle_error(f"setting '{name}'"):
|
|
self._config.set_obj(name, value, pattern=self._pattern)
|
|
|
|
def _join(self, attr: str) -> str:
|
|
"""Get the prefix joined with the given attribute."""
|
|
if self._prefix:
|
|
return '{}.{}'.format(self._prefix, attr)
|
|
return attr
|