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# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
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 3 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, see <http://www.gnu.org/licenses/>.
'''
import os
import threading
from plugins.linereader import LineReader
class ROPTY(LineReader):
'''
Read-only PTY for viewing of wall, write and talk messages
@variable on_update:()→void Called when a new line is available
@variable master:int The file descriptor of the PTY master
@variable slave:int The file descriptor of the PTY slave
'''
def __init__(self, on_update = None):
'''
Constructor
@param on_update:()→void Called when a new line is available
'''
def noop():
pass
self.on_update = noop if on_update is None else on_update
(self.master, self.slave) = os.openpty()
self.__reader = LineReader(self.master)
self.__condition = threading.Condition()
self.__queue = []
def background():
try:
while True:
got = self.__reader.next()
if got is None:
return
self.__condition.acquire()
try:
self.__queue.append(got)
finally:
self.__condition.release()
self.on_update()
except:
return
self.__thread = threading.Thread(target = background)
self.__thread.setDaemon(True)
self.__thread.start()
def close(self):
'''
Close the PTY
'''
os.close(self.slave)
os.close(self.master)
def size(self):
'''
Return the number of available lines
@return :int The number of available lines
'''
self.__condition.acquire()
try:
return len(self.__queue)
finally:
self.__condition.release()
def __len__(self):
'''
Return the number of available lines
@return :int The number of available lines
'''
return self.size()
def next(self):
'''
Return and unqueue the next available line
@return :str The next available line, `None` if there
are no more lines currently available
'''
self.__condition.acquire()
try:
if len(self.__queue) == 0:
return None
rc = self.__queue[0]
self.__queue[:] = self.__queue[1:]
finally:
self.__condition.release()
return rc
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