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# Copyright 2010 Lars Wirzenius
#
# 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 sys
import time
class Messager(object):
'''Write messages to the terminal.'''
def __init__(self, output=None):
self.output = output or sys.stderr
self._last_msg = '' # What did we write last?
self._last_time = 0 # When did we write last?
self._period = 1 # How long between updates?
def _now(self):
'''Return current time.'''
# This is a wrapper around time.time(), for testing.
return time.time()
def _raw_write(self, string):
'''Write raw data if output is terminal.'''
if self.output.isatty():
if self._last_msg:
self.output.write('\r' + (' ' * len(self._last_msg)) + '\r')
self.output.write(string)
self._last_msg = string
def write(self, string):
'''Write raw data, but only once per period.'''
now = self._now()
if now - self._last_time >= self._period:
self._raw_write(string)
self._last_time = now
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