831 lines
29 KiB
Python
831 lines
29 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 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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"""Showing prompts above the statusbar."""
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import os.path
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import html
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import collections
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import sip
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from PyQt5.QtCore import (pyqtSlot, pyqtSignal, Qt, QTimer, QDir, QModelIndex,
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QItemSelectionModel, QObject)
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from PyQt5.QtWidgets import (QWidget, QGridLayout, QVBoxLayout, QLineEdit,
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QLabel, QFileSystemModel, QTreeView, QSizePolicy)
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from qutebrowser.browser import downloads
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from qutebrowser.config import style
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from qutebrowser.utils import usertypes, log, utils, qtutils, objreg, message
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from qutebrowser.keyinput import modeman
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from qutebrowser.commands import cmdutils, cmdexc
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prompt_queue = None
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AuthTuple = collections.namedtuple('AuthTuple', ['user', 'password'])
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class Error(Exception):
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"""Base class for errors in this module."""
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class UnsupportedOperationError(Exception):
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"""Raised when the prompt class doesn't support the requested operation."""
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class PromptQueue(QObject):
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"""Global manager and queue for upcoming prompts.
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The way in which multiple questions are handled deserves some explanation.
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If a question is blocking, we *need* to ask it immediately, and can't wait
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for previous questions to finish. We could theoretically ask a blocking
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question inside of another blocking one, so in ask_question we simply save
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the current question on the stack, let the user answer the *most recent*
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question, and then restore the previous state.
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With a non-blocking question, things are a bit easier. We simply add it to
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self._queue if we're still busy handling another question, since it can be
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answered at any time.
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In either case, as soon as we finished handling a question, we call
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_pop_later() which schedules a _pop to ask the next question in _queue. We
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schedule it rather than doing it immediately because then the order of how
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things happen is clear, e.g. on_mode_left can't happen after we already set
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up the *new* question.
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Attributes:
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_shutting_down: Whether we're currently shutting down the prompter and
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should ignore future questions to avoid segfaults.
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_loops: A list of local EventLoops to spin in when blocking.
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_queue: A deque of waiting questions.
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_question: The current Question object if we're handling a question.
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Signals:
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show_prompts: Emitted with a Question object when prompts should be
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shown.
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"""
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show_prompts = pyqtSignal(usertypes.Question)
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def __init__(self, parent=None):
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super().__init__(parent)
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self._question = None
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self._shutting_down = False
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self._loops = []
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self._queue = collections.deque()
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message.global_bridge.mode_left.connect(self._on_mode_left)
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def __repr__(self):
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return utils.get_repr(self, loops=len(self._loops),
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queue=len(self._queue), question=self._question)
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def _pop_later(self):
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"""Helper to call self._pop as soon as everything else is done."""
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QTimer.singleShot(0, self._pop)
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def _pop(self):
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"""Pop a question from the queue and ask it, if there are any."""
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log.prompt.debug("Popping from queue {}".format(self._queue))
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if self._queue:
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question = self._queue.popleft()
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if not sip.isdeleted(question):
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# the question could already be deleted, e.g. by a cancelled
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# download. See
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# https://github.com/The-Compiler/qutebrowser/issues/415
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self.ask_question(question, blocking=False)
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def shutdown(self):
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"""Cancel all blocking questions.
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Quits and removes all running event loops.
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Return:
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True if loops needed to be aborted,
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False otherwise.
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"""
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log.prompt.debug("Shutting down with loops {}".format(self._loops))
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self._shutting_down = True
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if self._loops:
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for loop in self._loops:
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loop.quit()
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loop.deleteLater()
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return True
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else:
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return False
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@pyqtSlot(usertypes.Question, bool)
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def ask_question(self, question, blocking):
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"""Display a prompt for a given question.
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Args:
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question: The Question object to ask.
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blocking: If True, this function blocks and returns the result.
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Return:
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The answer of the user when blocking=True.
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None if blocking=False.
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"""
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log.prompt.debug("Asking question {}, blocking {}, loops {}, queue "
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"{}".format(question, blocking, self._loops,
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self._queue))
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if self._shutting_down:
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# If we're currently shutting down we have to ignore this question
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# to avoid segfaults - see
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# https://github.com/The-Compiler/qutebrowser/issues/95
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log.prompt.debug("Ignoring question because we're shutting down.")
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question.abort()
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return None
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if self._question is not None and not blocking:
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# We got an async question, but we're already busy with one, so we
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# just queue it up for later.
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log.prompt.debug("Adding {} to queue.".format(question))
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self._queue.append(question)
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return
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if blocking:
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# If we're blocking we save the old question on the stack, so we
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# can restore it after exec, if exec gets called multiple times.
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log.prompt.debug("New question is blocking, saving {}".format(
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self._question))
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old_question = self._question
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if old_question is not None:
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old_question.interrupted = True
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self._question = question
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self.show_prompts.emit(question)
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if blocking:
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loop = qtutils.EventLoop()
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self._loops.append(loop)
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loop.destroyed.connect(lambda: self._loops.remove(loop))
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question.completed.connect(loop.quit)
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question.completed.connect(loop.deleteLater)
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log.prompt.debug("Starting loop.exec_() for {}".format(question))
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loop.exec_()
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log.prompt.debug("Ending loop.exec_() for {}".format(question))
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log.prompt.debug("Restoring old question {}".format(old_question))
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self._question = old_question
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self.show_prompts.emit(old_question)
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if old_question is None:
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# Nothing left to restore, so we can go back to popping async
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# questions.
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if self._queue:
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self._pop_later()
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return question.answer
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else:
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question.completed.connect(self._pop_later)
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@pyqtSlot(usertypes.KeyMode)
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def _on_mode_left(self, mode):
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"""Abort question when a prompt mode was left."""
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if mode not in [usertypes.KeyMode.prompt, usertypes.KeyMode.yesno]:
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return
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if self._question is None:
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return
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log.prompt.debug("Left mode {}, hiding {}".format(
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mode, self._question))
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self.show_prompts.emit(None)
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if self._question.answer is None and not self._question.is_aborted:
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log.prompt.debug("Cancelling {} because {} was left".format(
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self._question, mode))
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self._question.cancel()
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self._question = None
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class PromptContainer(QWidget):
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"""Container for prompts to be shown above the statusbar.
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This is a per-window object, however each window shows the same prompt.
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Attributes:
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_layout: The layout used to show prompts in.
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_win_id: The window ID this object is associated with.
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Signals:
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update_geometry: Emitted when the geometry should be updated.
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"""
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STYLESHEET = """
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{% set prompt_radius = config.get('ui', 'prompt-radius') %}
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QWidget#PromptContainer {
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{% if config.get('ui', 'status-position') == 'top' %}
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border-bottom-left-radius: {{ prompt_radius }}px;
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border-bottom-right-radius: {{ prompt_radius }}px;
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{% else %}
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border-top-left-radius: {{ prompt_radius }}px;
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border-top-right-radius: {{ prompt_radius }}px;
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{% endif %}
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}
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QWidget {
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font: {{ font['prompts'] }};
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color: {{ color['prompts.fg'] }};
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background-color: {{ color['prompts.bg'] }};
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}
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QTreeView {
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selection-background-color: {{ color['prompts.selected.bg'] }};
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}
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QTreeView::item:selected, QTreeView::item:selected:hover {
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background-color: {{ color['prompts.selected.bg'] }};
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}
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"""
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update_geometry = pyqtSignal()
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def __init__(self, win_id, parent=None):
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super().__init__(parent)
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self._layout = QVBoxLayout(self)
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self._layout.setContentsMargins(10, 10, 10, 10)
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self._win_id = win_id
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self._prompt = None
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self.setObjectName('PromptContainer')
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self.setAttribute(Qt.WA_StyledBackground, True)
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style.set_register_stylesheet(self)
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message.global_bridge.prompt_done.connect(self._on_prompt_done)
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prompt_queue.show_prompts.connect(self._on_show_prompts)
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message.global_bridge.mode_left.connect(self._on_global_mode_left)
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def __repr__(self):
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return utils.get_repr(self, win_id=self._win_id)
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@pyqtSlot(usertypes.Question)
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def _on_show_prompts(self, question):
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"""Show a prompt for the given question.
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Args:
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question: A Question object or None.
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"""
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item = self._layout.takeAt(0)
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if item is not None:
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widget = item.widget()
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log.prompt.debug("Deleting old prompt {}".format(widget))
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widget.hide()
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widget.deleteLater()
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if question is None:
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log.prompt.debug("No prompts left, hiding prompt container.")
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self._prompt = None
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self.hide()
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return
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classes = {
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usertypes.PromptMode.yesno: YesNoPrompt,
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usertypes.PromptMode.text: LineEditPrompt,
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usertypes.PromptMode.user_pwd: AuthenticationPrompt,
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usertypes.PromptMode.download: DownloadFilenamePrompt,
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usertypes.PromptMode.alert: AlertPrompt,
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}
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klass = classes[question.mode]
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prompt = klass(question)
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log.prompt.debug("Displaying prompt {}".format(prompt))
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self._prompt = prompt
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if not question.interrupted:
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# If this question was interrupted, we already connected the signal
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question.aborted.connect(
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lambda: modeman.leave(self._win_id, prompt.KEY_MODE, 'aborted',
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maybe=True))
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modeman.enter(self._win_id, prompt.KEY_MODE, 'question asked')
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self.setSizePolicy(prompt.sizePolicy())
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self._layout.addWidget(prompt)
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prompt.show()
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self.show()
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prompt.setFocus()
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self.update_geometry.emit()
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@pyqtSlot(usertypes.KeyMode)
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def _on_prompt_done(self, key_mode):
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"""Leave the prompt mode in this window if a question was answered."""
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modeman.leave(self._win_id, key_mode, ':prompt-accept', maybe=True)
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@pyqtSlot(usertypes.KeyMode)
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def _on_global_mode_left(self, mode):
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"""Leave prompt/yesno mode in this window if it was left elsewhere.
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This ensures no matter where a prompt was answered, we leave the prompt
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mode and dispose of the prompt object in every window.
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"""
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if mode not in [usertypes.KeyMode.prompt, usertypes.KeyMode.yesno]:
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return
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modeman.leave(self._win_id, mode, 'left in other window', maybe=True)
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item = self._layout.takeAt(0)
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if item is not None:
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widget = item.widget()
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log.prompt.debug("Deleting prompt {}".format(widget))
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widget.hide()
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widget.deleteLater()
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@cmdutils.register(instance='prompt-container', hide=True, scope='window',
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modes=[usertypes.KeyMode.prompt,
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usertypes.KeyMode.yesno])
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def prompt_accept(self, value=None):
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"""Accept the current prompt.
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//
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This executes the next action depending on the question mode, e.g. asks
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for the password or leaves the mode.
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Args:
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value: If given, uses this value instead of the entered one.
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For boolean prompts, "yes"/"no" are accepted as value.
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"""
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question = self._prompt.question
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try:
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done = self._prompt.accept(value)
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except Error as e:
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raise cmdexc.CommandError(str(e))
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if done:
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message.global_bridge.prompt_done.emit(self._prompt.KEY_MODE)
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question.done()
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@cmdutils.register(instance='prompt-container', hide=True, scope='window',
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modes=[usertypes.KeyMode.yesno],
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deprecated='Use :prompt-accept yes instead!')
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def prompt_yes(self):
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"""Answer yes to a yes/no prompt."""
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self.prompt_accept('yes')
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@cmdutils.register(instance='prompt-container', hide=True, scope='window',
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modes=[usertypes.KeyMode.yesno],
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deprecated='Use :prompt-accept no instead!')
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def prompt_no(self):
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"""Answer no to a yes/no prompt."""
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self.prompt_accept('no')
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@cmdutils.register(instance='prompt-container', hide=True, scope='window',
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modes=[usertypes.KeyMode.prompt], maxsplit=0)
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def prompt_open_download(self, cmdline: str=None):
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"""Immediately open a download.
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If no specific command is given, this will use the system's default
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application to open the file.
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Args:
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cmdline: The command which should be used to open the file. A `{}`
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is expanded to the temporary file name. If no `{}` is
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present, the filename is automatically appended to the
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cmdline.
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"""
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try:
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self._prompt.download_open(cmdline)
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except UnsupportedOperationError:
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pass
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@cmdutils.register(instance='prompt-container', hide=True, scope='window',
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modes=[usertypes.KeyMode.prompt])
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@cmdutils.argument('which', choices=['next', 'prev'])
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def prompt_item_focus(self, which):
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"""Shift the focus of the prompt file completion menu to another item.
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Args:
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which: 'next', 'prev'
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"""
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try:
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self._prompt.item_focus(which)
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except UnsupportedOperationError:
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pass
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class LineEdit(QLineEdit):
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"""A line edit used in prompts."""
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def __init__(self, parent=None):
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super().__init__(parent)
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self.setStyleSheet("""
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QLineEdit {
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border: 1px solid grey;
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background-color: transparent;
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}
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""")
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self.setAttribute(Qt.WA_MacShowFocusRect, False)
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def keyPressEvent(self, e):
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"""Override keyPressEvent to paste primary selection on Shift + Ins."""
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if e.key() == Qt.Key_Insert and e.modifiers() == Qt.ShiftModifier:
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try:
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text = utils.get_clipboard(selection=True)
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except utils.ClipboardError: # pragma: no cover
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pass
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else:
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e.accept()
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self.insert(text)
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return
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super().keyPressEvent(e)
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def __repr__(self):
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return utils.get_repr(self)
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class _BasePrompt(QWidget):
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"""Base class for all prompts."""
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KEY_MODE = usertypes.KeyMode.prompt
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def __init__(self, question, parent=None):
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super().__init__(parent)
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self.question = question
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self._vbox = QVBoxLayout(self)
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self._vbox.setSpacing(15)
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self._key_grid = None
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def __repr__(self):
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return utils.get_repr(self, question=self.question, constructor=True)
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def _init_texts(self, question):
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assert question.title is not None, question
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title = '<font size="4"><b>{}</b></font>'.format(
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html.escape(question.title))
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title_label = QLabel(title, self)
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self._vbox.addWidget(title_label)
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if question.text is not None:
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# Not doing any HTML escaping here as the text can be formatted
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text_label = QLabel(question.text)
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self._vbox.addWidget(text_label)
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def _init_key_label(self):
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assert self._key_grid is None, self._key_grid
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self._key_grid = QGridLayout()
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self._key_grid.setVerticalSpacing(0)
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key_config = objreg.get('key-config')
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# The bindings are all in the 'prompt' mode, even for yesno prompts
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all_bindings = key_config.get_reverse_bindings_for('prompt')
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labels = []
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for cmd, text in self._allowed_commands():
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bindings = all_bindings.get(cmd, [])
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if bindings:
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binding = None
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preferred = ['<enter>', '<escape>']
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for pref in preferred:
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if pref in bindings:
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binding = pref
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if binding is None:
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binding = bindings[0]
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key_label = QLabel('<b>{}</b>'.format(html.escape(binding)))
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text_label = QLabel(text)
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labels.append((key_label, text_label))
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for i, (key_label, text_label) in enumerate(labels):
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self._key_grid.addWidget(key_label, i, 0)
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self._key_grid.addWidget(text_label, i, 1)
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self._vbox.addLayout(self._key_grid)
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def accept(self, value=None):
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raise NotImplementedError
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def download_open(self, _cmdline):
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"""Open the download directly if this is a download prompt."""
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raise UnsupportedOperationError
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def item_focus(self, _which):
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"""Switch to next file item if this is a filename prompt.."""
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raise UnsupportedOperationError
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def _allowed_commands(self):
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"""Get the commands we could run as response to this message."""
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raise NotImplementedError
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class LineEditPrompt(_BasePrompt):
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"""A prompt for a single text value."""
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._lineedit = LineEdit(self)
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self._init_texts(question)
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self._vbox.addWidget(self._lineedit)
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if question.default:
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self._lineedit.setText(question.default)
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self.setFocusProxy(self._lineedit)
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self._init_key_label()
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def accept(self, value=None):
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text = value if value is not None else self._lineedit.text()
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self.question.answer = text
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return True
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def _allowed_commands(self):
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return [('prompt-accept', 'Accept'), ('leave-mode', 'Abort')]
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class FilenamePrompt(_BasePrompt):
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"""A prompt for a filename."""
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._init_texts(question)
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self._init_fileview()
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self._set_fileview_root(question.default)
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self._lineedit = LineEdit(self)
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if question.default:
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self._lineedit.setText(question.default)
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self._lineedit.textEdited.connect(self._set_fileview_root)
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self._vbox.addWidget(self._lineedit)
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self.setFocusProxy(self._lineedit)
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self._init_key_label()
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self.setSizePolicy(QSizePolicy.Expanding, QSizePolicy.Preferred)
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@pyqtSlot(str)
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def _set_fileview_root(self, path, *, tabbed=False):
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"""Set the root path for the file display."""
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separators = os.sep
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if os.altsep is not None:
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separators += os.altsep
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dirname = os.path.dirname(path)
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try:
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if not path:
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pass
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elif path in separators and os.path.isdir(path):
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# Input "/" -> don't strip anything
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pass
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elif path[-1] in separators and os.path.isdir(path):
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# Input like /foo/bar/ -> show /foo/bar/ contents
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path = path.rstrip(separators)
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elif os.path.isdir(dirname) and not tabbed:
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# Input like /foo/ba -> show /foo contents
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path = dirname
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else:
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return
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except OSError:
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log.prompt.exception("Failed to get directory information")
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return
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root = self._file_model.setRootPath(path)
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self._file_view.setRootIndex(root)
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@pyqtSlot(QModelIndex)
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def _insert_path(self, index, *, clicked=True):
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"""Handle an element selection.
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Args:
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index: The QModelIndex of the selected element.
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clicked: Whether the element was clicked.
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"""
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path = os.path.normpath(self._file_model.filePath(index))
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if clicked:
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path += os.sep
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else:
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# On Windows, when we have C:\foo and tab over .., we get C:\
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path = path.rstrip(os.sep)
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log.prompt.debug('Inserting path {}'.format(path))
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self._lineedit.setText(path)
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self._lineedit.setFocus()
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self._set_fileview_root(path, tabbed=True)
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if clicked:
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# Avoid having a ..-subtree highlighted
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self._file_view.setCurrentIndex(QModelIndex())
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def _init_fileview(self):
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self._file_view = QTreeView(self)
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self._file_model = QFileSystemModel(self)
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self._file_view.setModel(self._file_model)
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self._file_view.clicked.connect(self._insert_path)
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self._vbox.addWidget(self._file_view)
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# Only show name
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self._file_view.setHeaderHidden(True)
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for col in range(1, 4):
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self._file_view.setColumnHidden(col, True)
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# Nothing selected initially
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self._file_view.setCurrentIndex(QModelIndex())
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# The model needs to be sorted so we get the correct first/last index
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self._file_model.directoryLoaded.connect(
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lambda: self._file_model.sort(0))
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def accept(self, value=None):
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text = value if value is not None else self._lineedit.text()
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self.question.answer = text
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return True
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def item_focus(self, which):
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# This duplicates some completion code, but I don't see a nicer way...
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assert which in ['prev', 'next'], which
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selmodel = self._file_view.selectionModel()
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parent = self._file_view.rootIndex()
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first_index = self._file_model.index(0, 0, parent)
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row = self._file_model.rowCount(parent) - 1
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last_index = self._file_model.index(row, 0, parent)
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if not first_index.isValid():
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# No entries
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return
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assert last_index.isValid()
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idx = selmodel.currentIndex()
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if not idx.isValid():
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# No item selected yet
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idx = last_index if which == 'prev' else first_index
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elif which == 'prev':
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idx = self._file_view.indexAbove(idx)
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else:
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assert which == 'next', which
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idx = self._file_view.indexBelow(idx)
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# wrap around if we arrived at beginning/end
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if not idx.isValid():
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idx = last_index if which == 'prev' else first_index
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selmodel.setCurrentIndex(
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idx, QItemSelectionModel.ClearAndSelect | QItemSelectionModel.Rows)
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self._insert_path(idx, clicked=False)
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def _allowed_commands(self):
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return [('prompt-accept', 'Accept'), ('leave-mode', 'Abort')]
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class DownloadFilenamePrompt(FilenamePrompt):
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"""A prompt for a filename for downloads."""
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._file_model.setFilter(QDir.AllDirs | QDir.Drives | QDir.NoDot)
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def accept(self, value=None):
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text = value if value is not None else self._lineedit.text()
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self.question.answer = downloads.FileDownloadTarget(text)
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return True
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def download_open(self, cmdline):
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self.question.answer = downloads.OpenFileDownloadTarget(cmdline)
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self.question.done()
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message.global_bridge.prompt_done.emit(self.KEY_MODE)
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def _allowed_commands(self):
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cmds = [
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('prompt-accept', 'Accept'),
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('leave-mode', 'Abort'),
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('prompt-open-download', "Open download"),
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]
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return cmds
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class AuthenticationPrompt(_BasePrompt):
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"""A prompt for username/password."""
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._init_texts(question)
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user_label = QLabel("Username:", self)
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self._user_lineedit = LineEdit(self)
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password_label = QLabel("Password:", self)
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self._password_lineedit = LineEdit(self)
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self._password_lineedit.setEchoMode(QLineEdit.Password)
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grid = QGridLayout()
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grid.addWidget(user_label, 1, 0)
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grid.addWidget(self._user_lineedit, 1, 1)
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grid.addWidget(password_label, 2, 0)
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grid.addWidget(self._password_lineedit, 2, 1)
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self._vbox.addLayout(grid)
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self._init_key_label()
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assert not question.default, question.default
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self.setFocusProxy(self._user_lineedit)
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def accept(self, value=None):
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if value is not None:
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if ':' not in value:
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raise Error("Value needs to be in the format "
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"username:password, but {} was given".format(
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value))
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username, password = value.split(':', maxsplit=1)
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self.question.answer = AuthTuple(username, password)
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return True
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elif self._user_lineedit.hasFocus():
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# Earlier, tab was bound to :prompt-accept, so to still support
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# that we simply switch the focus when tab was pressed.
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self._password_lineedit.setFocus()
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return False
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else:
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self.question.answer = AuthTuple(self._user_lineedit.text(),
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self._password_lineedit.text())
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return True
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def item_focus(self, which):
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"""Support switching between fields with tab."""
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assert which in ['prev', 'next'], which
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if which == 'next' and self._user_lineedit.hasFocus():
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self._password_lineedit.setFocus()
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elif which == 'prev' and self._password_lineedit.hasFocus():
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self._user_lineedit.setFocus()
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def _allowed_commands(self):
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return [('prompt-accept', "Accept"),
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('leave-mode', "Abort")]
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class YesNoPrompt(_BasePrompt):
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"""A prompt with yes/no answers."""
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KEY_MODE = usertypes.KeyMode.yesno
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._init_texts(question)
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self._init_key_label()
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def accept(self, value=None):
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if value is None:
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if self.question.default is None:
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raise Error("No default value was set for this question!")
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self.question.answer = self.question.default
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elif value == 'yes':
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self.question.answer = True
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elif value == 'no':
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self.question.answer = False
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else:
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raise Error("Invalid value {} - expected yes/no!".format(value))
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return True
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def _allowed_commands(self):
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cmds = [
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('prompt-accept yes', "Yes"),
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('prompt-accept no', "No"),
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]
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if self.question.default is not None:
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assert self.question.default in [True, False]
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default = 'yes' if self.question.default else 'no'
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cmds.append(('prompt-accept', "Use default ({})".format(default)))
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cmds.append(('leave-mode', "Abort"))
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return cmds
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class AlertPrompt(_BasePrompt):
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"""A prompt without any answer possibility."""
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def __init__(self, question, parent=None):
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super().__init__(question, parent)
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self._init_texts(question)
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self._init_key_label()
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def accept(self, value=None):
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if value is not None:
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raise Error("No value is permitted with alert prompts!")
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# Simply mark prompt as done without setting self.question.answer
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return True
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def _allowed_commands(self):
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return [('prompt-accept', "Hide")]
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def init():
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"""Initialize global prompt objects."""
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global prompt_queue
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prompt_queue = PromptQueue()
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objreg.register('prompt-queue', prompt_queue) # for commands
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message.global_bridge.ask_question.connect(
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prompt_queue.ask_question, Qt.DirectConnection)
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