194 lines
7.1 KiB
Python
194 lines
7.1 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2014-2017 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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"""Launcher for an external editor."""
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import os
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import tempfile
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from PyQt5.QtCore import pyqtSignal, pyqtSlot, QObject, QProcess
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from qutebrowser.config import config
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from qutebrowser.utils import message, log
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from qutebrowser.misc import guiprocess
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class ExternalEditor(QObject):
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"""Class to simplify editing a text in an external editor.
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Attributes:
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_text: The current text before the editor is opened.
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_filename: The name of the file to be edited.
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_remove_file: Whether the file should be removed when the editor is
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closed.
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_proc: The GUIProcess of the editor.
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"""
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editing_finished = pyqtSignal(str)
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def __init__(self, parent=None):
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super().__init__(parent)
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self._filename = None
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self._proc = None
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self._remove_file = None
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def _cleanup(self):
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"""Clean up temporary files after the editor closed."""
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assert self._remove_file is not None
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if self._filename is None or not self._remove_file:
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# Could not create initial file.
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return
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try:
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if self._proc.exit_status() != QProcess.CrashExit:
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os.remove(self._filename)
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except OSError as e:
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# NOTE: Do not replace this with "raise CommandError" as it's
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# executed async.
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message.error("Failed to delete tempfile... ({})".format(e))
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@pyqtSlot(int, QProcess.ExitStatus)
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def on_proc_closed(self, exitcode, exitstatus):
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"""Write the editor text into the form field and clean up tempfile.
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Callback for QProcess when the editor was closed.
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"""
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log.procs.debug("Editor closed")
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if exitstatus != QProcess.NormalExit:
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# No error/cleanup here, since we already handle this in
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# on_proc_error.
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return
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try:
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if exitcode != 0:
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return
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encoding = config.val.editor.encoding
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try:
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with open(self._filename, 'r', encoding=encoding) as f:
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text = f.read()
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except OSError as e:
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# NOTE: Do not replace this with "raise CommandError" as it's
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# executed async.
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message.error("Failed to read back edited file: {}".format(e))
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return
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log.procs.debug("Read back: {}".format(text))
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self.editing_finished.emit(text)
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finally:
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self._cleanup()
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@pyqtSlot(QProcess.ProcessError)
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def on_proc_error(self, _err):
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self._cleanup()
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def edit(self, text, caret_position=0):
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"""Edit a given text.
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Args:
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text: The initial text to edit.
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caret_position: The position of the caret in the text.
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"""
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if self._filename is not None:
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raise ValueError("Already editing a file!")
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try:
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# Close while the external process is running, as otherwise systems
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# with exclusive write access (e.g. Windows) may fail to update
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# the file from the external editor, see
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# https://github.com/qutebrowser/qutebrowser/issues/1767
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with tempfile.NamedTemporaryFile(
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mode='w', prefix='qutebrowser-editor-',
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encoding=config.val.editor.encoding,
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delete=False) as fobj:
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if text:
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fobj.write(text)
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self._filename = fobj.name
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except OSError as e:
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message.error("Failed to create initial file: {}".format(e))
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return
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self._remove_file = True
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# Here we calculate the line and column of the caret based on its
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# position and the given text.
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#
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# NOTE: Both line and column are 1-based indexes, because that's what
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# most editors use as line and column starting index.
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# By "most" we mean at least vim, nvim, gvim, emacs, atom, sublimetext,
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# notepad++, brackets, visual studio, QtCreator and so on.
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#
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# To find the line we just count how many newlines there are before
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# the caret and add 1.
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#
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# To find the column we calculate the difference between the caret and
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# the last newline before the caret.
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#
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# For example in the text `aaa\nbb|bbb` (| represents the caret):
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# caret_position = 6
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# text[:caret_position] = `aaa\nbb`
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# text[:caret_psotion].count('\n') = 1
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# caret_position - text[:caret_position].rfind('\n') = 3
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#
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# Thus line, column = 2, 3, and the caret is indeed in the second
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# line, third column
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line = text[:caret_position].count('\n') + 1
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column = caret_position - text[:caret_position].rfind('\n')
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self._start_editor(line=line, column=column)
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def edit_file(self, filename):
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"""Edit the file with the given filename."""
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self._filename = filename
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self._remove_file = False
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self._start_editor()
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def _start_editor(self, line=1, column=1):
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"""Start the editor with the file opened as self._filename.
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Args:
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caret_position: The position of the caret in the text.
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"""
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self._proc = guiprocess.GUIProcess(what='editor', parent=self)
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self._proc.finished.connect(self.on_proc_closed)
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self._proc.error.connect(self.on_proc_error)
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editor = config.val.editor.command
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executable = editor[0]
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args = [self._sub_placeholder(arg, line, column) for arg in editor[1:]]
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log.procs.debug("Calling \"{}\" with args {}".format(executable, args))
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self._proc.start(executable, args)
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def _sub_placeholder(self, possible_placeholder, line, column):
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"""Substitute a single placeholder.
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The input to this function is not guaranteed to be a valid or known
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placeholder. In this case the return value is the unchanged input.
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Args:
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possible_placeholder: an argument of editor.command.
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Return:
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The substituted placeholder or the original argument
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"""
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sub = possible_placeholder\
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.replace('{}', self._filename)\
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.replace('{file}', self._filename)\
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.replace('{line}', str(line))\
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.replace('{line0}', str(line-1))\
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.replace('{column}', str(column))\
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.replace('{column0}', str(column-1))
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return sub
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