# -*- python -*-
'''
xpybar – xmobar replacement written in python
Copyright © 2014, 2015, 2016, 2017 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
from util import *
class LineReader:
'''
Line reader
'''
def __init__(self, channel = None):
'''
Constructor
@param channel:str|int|istream? The pathname, file descriptor or stream
of the file to read, `None` for stdin
'''
self.__channel = None
if channel is None:
self.__next = lambda : input()
else:
next__ = lambda : channel.read(1)
if isinstance(channel, str):
self.__channel = channel = os.open(channel, os.O_RDONLY)
if isinstance(channel, int):
channel = os.fdopen(channel)
next__ = lambda : channel.read(1)
buffer = ''
def next_():
nonlocal buffer
while True:
got = next__()
if (got is None) or (len(got) == 0):
return None
if not isinstance(got, str):
got = got.decode('utf-8', 'replace')
buffer += got
if '\n' in buffer:
got = buffer.find('\n')
got, buffer = buffer[:got], buffer[got + 1:]
return got
self.__next = next_
def next(self):
'''
Reads the next line
@return :str? The next line, `None` if stream has closed
'''
try:
return self.__next()
except:
return None
def close(self):
'''
Close any file this object has opened
'''
if self.__channel is not None:
os.close(self.__channel)
def __enter__(self):
'''
Invoked when `with` enters
'''
return self
def __exit__(self, _type, _value, _trace):
'''
Invoked when `with` exits
'''
self.close()
