Viewing file:  helpers.py (2.79 KB) -rw-r--r--
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# Copyright (c) 2012 Giorgos Verigakis <verigak@gmail.com>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
from __future__ import print_function
HIDE_CURSOR = '\x1b[?25l'
SHOW_CURSOR = '\x1b[?25h'
class WriteMixin(object):
hide_cursor = False
def __init__(self, message=None, **kwargs):
super(WriteMixin, self).__init__(**kwargs)
self._width = 0
if message:
self.message = message
if self.file.isatty():
if self.hide_cursor:
print(HIDE_CURSOR, end='', file=self.file)
print(self.message, end='', file=self.file)
self.file.flush()
def write(self, s):
if self.file.isatty():
b = '\b' * self._width
c = s.ljust(self._width)
print(b + c, end='', file=self.file)
self._width = max(self._width, len(s))
self.file.flush()
def finish(self):
if self.file.isatty() and self.hide_cursor:
print(SHOW_CURSOR, end='', file=self.file)
class WritelnMixin(object):
hide_cursor = False
def __init__(self, message=None, **kwargs):
super(WritelnMixin, self).__init__(**kwargs)
if message:
self.message = message
if self.file.isatty() and self.hide_cursor:
print(HIDE_CURSOR, end='', file=self.file)
def clearln(self):
if self.file.isatty():
print('\r\x1b[K', end='', file=self.file)
def writeln(self, line):
if self.file.isatty():
self.clearln()
print(line, end='', file=self.file)
self.file.flush()
def finish(self):
if self.file.isatty():
print(file=self.file)
if self.hide_cursor:
print(SHOW_CURSOR, end='', file=self.file)
from signal import signal, SIGINT
from sys import exit
class SigIntMixin(object):
"""Registers a signal handler that calls finish on SIGINT"""
def __init__(self, *args, **kwargs):
super(SigIntMixin, self).__init__(*args, **kwargs)
signal(SIGINT, self._sigint_handler)
def _sigint_handler(self, signum, frame):
self.finish()
exit(0)
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