python-progressbar/progressbar/utils.py at develop · okeuday/python-progressbar · GitHub

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from __future__ import absolute_import

import io

import os

import sys

import logging

from python_utils.time import timedelta_to_seconds, epoch, format_time

from python_utils.converters import scale_1024

from python_utils.terminal import get_terminal_size

import six

assert timedelta_to_seconds

assert get_terminal_size

assert format_time

assert scale_1024

assert epoch

class WrappingIO:

def __init__(self, target, capturing=False, listeners=set()):

self.buffer = six.StringIO()

self.target = target

self.capturing = capturing

self.listeners = listeners

def write(self, value):

if self.capturing:

self.buffer.write(value)

if '\n' in value:

for listener in self.listeners: # pragma: no branch

listener.update()

else:

self.target.write(value)

def flush(self):

self.buffer.flush()

def _flush(self):

value = self.buffer.getvalue()

if value:

self.flush()

self.target.write(value)

self.buffer.seek(0)

self.buffer.truncate(0)

class StreamWrapper(object):

'''Wrap stdout and stderr globally'''

def __init__(self):

self.stdout = self.original_stdout = sys.stdout

self.stderr = self.original_stderr = sys.stderr

self.original_excepthook = sys.excepthook

self.wrapped_stdout = 0

self.wrapped_stderr = 0

self.wrapped_excepthook = 0

self.capturing = 0

self.listeners = set()

if os.environ.get('WRAP_STDOUT'): # pragma: no cover

self.wrap_stdout()

if os.environ.get('WRAP_STDERR'): # pragma: no cover

self.wrap_stderr()

def start_capturing(self, bar=None):

if bar: # pragma: no branch

self.listeners.add(bar)

self.capturing += 1

self.update_capturing()

def stop_capturing(self, bar=None):

if bar: # pragma: no branch

try:

self.listeners.remove(bar)

except KeyError:

pass

self.capturing -= 1

self.update_capturing()

def update_capturing(self): # pragma: no cover

if isinstance(self.stdout, WrappingIO):

self.stdout.capturing = self.capturing > 0

if isinstance(self.stderr, WrappingIO):

self.stderr.capturing = self.capturing > 0

if self.capturing <= 0:

self.flush()

def wrap(self, stdout=False, stderr=False):

if stdout:

self.wrap_stdout()

if stderr:

self.wrap_stderr()

def wrap_stdout(self):

self.wrap_excepthook()

if not self.wrapped_stdout:

self.stdout = sys.stdout = WrappingIO(self.original_stdout,

listeners=self.listeners)

self.wrapped_stdout += 1

return sys.stdout

def wrap_stderr(self):

self.wrap_excepthook()

if not self.wrapped_stderr:

self.stderr = sys.stderr = WrappingIO(self.original_stderr,

listeners=self.listeners)

self.wrapped_stderr += 1

return sys.stderr

def unwrap_excepthook(self):

if self.wrapped_excepthook:

self.wrapped_excepthook -= 1

sys.excepthook = self.original_excepthook

def wrap_excepthook(self):

if not self.wrapped_excepthook:

logger.debug('wrapping excepthook')

self.wrapped_excepthook += 1

sys.excepthook = self.excepthook

def unwrap(self, stdout=False, stderr=False):

if stdout:

self.unwrap_stdout()

if stderr:

self.unwrap_stderr()

def unwrap_stdout(self):

if self.wrapped_stdout > 1:

self.wrapped_stdout -= 1

else:

sys.stdout = self.original_stdout

self.wrapped_stdout = 0

def unwrap_stderr(self):

if self.wrapped_stderr > 1:

self.wrapped_stderr -= 1

else:

sys.stderr = self.original_stderr

self.wrapped_stderr = 0

def flush(self):

if self.wrapped_stdout: # pragma: no branch

try:

self.stdout._flush()

except (io.UnsupportedOperation,

AttributeError): # pragma: no cover

self.wrapped_stdout = False

logger.warn('Disabling stdout redirection, %r is not seekable',

sys.stdout)

if self.wrapped_stderr: # pragma: no branch

try:

self.stderr._flush()

except (io.UnsupportedOperation,

AttributeError): # pragma: no cover

self.wrapped_stderr = False

logger.warn('Disabling stderr redirection, %r is not seekable',

sys.stderr)

def excepthook(self, exc_type, exc_value, exc_traceback):

self.original_excepthook(exc_type, exc_value, exc_traceback)

self.flush()

streams = StreamWrapper()

logger = logging.getLogger(__name__)

python-progressbar/progressbar/utils.py at develop · okeuday/python-progressbar · GitHub

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