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# This file is part of the Frescobaldi project, http://www.frescobaldi.org/
#
# Copyright (c) 2012 - 2014 by Wilbert Berendsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# See http://www.gnu.org/licenses/ for more information.
"""
Inter-Process Communication with already running Frescobaldi instances.
This is done via a local (unix domain) socket, to which simple commands
are written. Every command is a line of ASCII characters, terminated by a
newline. Arguments are separated with spaces.
"""
from PyQt5.QtCore import QUrl
from PyQt5.QtNetwork import QLocalSocket
import app
_incoming_handlers = []
class Remote(object):
"""Speak to the remote Frescobaldi."""
def __init__(self, socket):
self.socket = socket
def close(self):
"""Close and disconnect."""
self.write(b'bye\n')
self.socket.waitForBytesWritten()
self.socket.disconnectFromServer()
if self.socket.state() == QLocalSocket.ConnectedState:
self.socket.waitForDisconnected(5000)
def write(self, data):
"""Writes binary data."""
while data:
l = self.socket.write(data)
data = data[l:]
def command_line(self, args, urls):
"""Let remote Frescobaldi handle a command line."""
if urls:
if args.encoding:
self.write('encoding {0}\n'.format(args.encoding).encode('utf-8'))
for u in urls:
self.write(b'open ' + u.toEncoded() + b'\n')
self.write(b'set_current ' + u.toEncoded() + b'\n')
if args.line is not None:
self.write('set_cursor {0} {1}\n'.format(args.line, args.column).encode('utf-8'))
self.write(b'activate_window\n')
class Incoming(object):
"""Handle an incoming connection."""
def __init__(self, socket):
"""Start reading from the socket and perform the commands."""
self.socket = socket
self.data = bytearray()
self.encoding = None
_incoming_handlers.append(self)
socket.readyRead.connect(self.read)
def close(self):
if self in _incoming_handlers:
self.socket.deleteLater()
_incoming_handlers.remove(self)
def read(self):
"""Read from the socket and let command() handle the commands."""
self.data.extend(self.socket.readAll())
pos = self.data.find(b'\n')
end = 0
while pos != -1:
self.command(self.data[end:pos])
end = pos + 1
pos = self.data.find(b'\n', end)
del self.data[:end]
if self.socket.state() == QLocalSocket.UnconnectedState:
self.close()
def command(self, command):
"""Perform one command."""
command = command.split()
cmd = command[0]
args = command[1:]
win = app.activeWindow()
if not win:
import mainwindow
win = mainwindow.MainWindow()
win.show()
if cmd == b'open':
url = QUrl.fromEncoded(args[0])
win.openUrl(url, self.encoding)
elif cmd == b'encoding':
self.encoding = str(args[0])
elif cmd == b'activate_window':
win.activateWindow()
win.raise_()
elif cmd == b'set_current':
url = QUrl.fromEncoded(args[0])
try:
win.setCurrentDocument(app.openUrl(url)) # already loaded
except IOError:
pass
elif cmd == b'set_cursor':
line, column = map(int, args)
cursor = win.textCursor()
pos = cursor.document().findBlockByNumber(line - 1).position() + column
cursor.setPosition(pos)
win.currentView().setTextCursor(cursor)
elif cmd == b'bye':
self.close()
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