355 lines
9.6 KiB
Python
355 lines
9.6 KiB
Python
"""
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General helpers required for `tqdm.std`.
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"""
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import os
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import re
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import sys
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from functools import wraps
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from warnings import warn
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from weakref import proxy
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# py2/3 compat
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try:
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_range = xrange
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except NameError:
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_range = range
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try:
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_unich = unichr
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except NameError:
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_unich = chr
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try:
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_unicode = unicode
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except NameError:
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_unicode = str
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try:
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_basestring = basestring
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except NameError:
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_basestring = str
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CUR_OS = sys.platform
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IS_WIN = any(CUR_OS.startswith(i) for i in ['win32', 'cygwin'])
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IS_NIX = any(CUR_OS.startswith(i) for i in ['aix', 'linux', 'darwin'])
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RE_ANSI = re.compile(r"\x1b\[[;\d]*[A-Za-z]")
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try:
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if IS_WIN:
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import colorama
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else:
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raise ImportError
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except ImportError:
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colorama = None
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else:
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try:
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colorama.init(strip=False)
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except TypeError:
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colorama.init()
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class FormatReplace(object):
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"""
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>>> a = FormatReplace('something')
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>>> "{:5d}".format(a)
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'something'
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""" # NOQA: P102
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def __init__(self, replace=''):
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self.replace = replace
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self.format_called = 0
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def __format__(self, _):
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self.format_called += 1
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return self.replace
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class Comparable(object):
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"""Assumes child has self._comparable attr/@property"""
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def __lt__(self, other):
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return self._comparable < other._comparable
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def __le__(self, other):
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return (self < other) or (self == other)
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def __eq__(self, other):
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return self._comparable == other._comparable
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def __ne__(self, other):
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return not self == other
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def __gt__(self, other):
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return not self <= other
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def __ge__(self, other):
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return not self < other
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class ObjectWrapper(object):
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def __getattr__(self, name):
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return getattr(self._wrapped, name)
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def __setattr__(self, name, value):
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return setattr(self._wrapped, name, value)
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def wrapper_getattr(self, name):
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"""Actual `self.getattr` rather than self._wrapped.getattr"""
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try:
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return object.__getattr__(self, name)
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except AttributeError: # py2
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return getattr(self, name)
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def wrapper_setattr(self, name, value):
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"""Actual `self.setattr` rather than self._wrapped.setattr"""
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return object.__setattr__(self, name, value)
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def __init__(self, wrapped):
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"""
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Thin wrapper around a given object
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"""
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self.wrapper_setattr('_wrapped', wrapped)
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class SimpleTextIOWrapper(ObjectWrapper):
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"""
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Change only `.write()` of the wrapped object by encoding the passed
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value and passing the result to the wrapped object's `.write()` method.
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"""
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# pylint: disable=too-few-public-methods
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def __init__(self, wrapped, encoding):
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super(SimpleTextIOWrapper, self).__init__(wrapped)
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self.wrapper_setattr('encoding', encoding)
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def write(self, s):
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"""
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Encode `s` and pass to the wrapped object's `.write()` method.
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"""
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return self._wrapped.write(s.encode(self.wrapper_getattr('encoding')))
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def __eq__(self, other):
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return self._wrapped == getattr(other, '_wrapped', other)
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class DisableOnWriteError(ObjectWrapper):
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"""
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Disable the given `tqdm_instance` upon `write()` or `flush()` errors.
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"""
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@staticmethod
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def disable_on_exception(tqdm_instance, func):
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"""
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Quietly set `tqdm_instance.miniters=inf` if `func` raises `errno=5`.
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"""
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tqdm_instance = proxy(tqdm_instance)
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def inner(*args, **kwargs):
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try:
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return func(*args, **kwargs)
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except OSError as e:
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if e.errno != 5:
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raise
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try:
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tqdm_instance.miniters = float('inf')
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except ReferenceError:
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pass
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except ValueError as e:
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if 'closed' not in str(e):
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raise
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try:
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tqdm_instance.miniters = float('inf')
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except ReferenceError:
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pass
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return inner
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def __init__(self, wrapped, tqdm_instance):
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super(DisableOnWriteError, self).__init__(wrapped)
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if hasattr(wrapped, 'write'):
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self.wrapper_setattr(
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'write', self.disable_on_exception(tqdm_instance, wrapped.write))
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if hasattr(wrapped, 'flush'):
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self.wrapper_setattr(
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'flush', self.disable_on_exception(tqdm_instance, wrapped.flush))
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def __eq__(self, other):
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return self._wrapped == getattr(other, '_wrapped', other)
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class CallbackIOWrapper(ObjectWrapper):
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def __init__(self, callback, stream, method="read"):
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"""
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Wrap a given `file`-like object's `read()` or `write()` to report
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lengths to the given `callback`
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"""
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super(CallbackIOWrapper, self).__init__(stream)
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func = getattr(stream, method)
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if method == "write":
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@wraps(func)
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def write(data, *args, **kwargs):
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res = func(data, *args, **kwargs)
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callback(len(data))
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return res
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self.wrapper_setattr('write', write)
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elif method == "read":
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@wraps(func)
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def read(*args, **kwargs):
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data = func(*args, **kwargs)
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callback(len(data))
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return data
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self.wrapper_setattr('read', read)
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else:
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raise KeyError("Can only wrap read/write methods")
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def _is_utf(encoding):
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try:
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u'\u2588\u2589'.encode(encoding)
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except UnicodeEncodeError:
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return False
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except Exception:
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try:
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return encoding.lower().startswith('utf-') or ('U8' == encoding)
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except Exception:
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return False
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else:
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return True
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def _supports_unicode(fp):
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try:
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return _is_utf(fp.encoding)
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except AttributeError:
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return False
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def _is_ascii(s):
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if isinstance(s, str):
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for c in s:
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if ord(c) > 255:
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return False
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return True
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return _supports_unicode(s)
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def _screen_shape_wrapper(): # pragma: no cover
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"""
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Return a function which returns console dimensions (width, height).
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Supported: linux, osx, windows, cygwin.
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"""
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_screen_shape = None
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if IS_WIN:
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_screen_shape = _screen_shape_windows
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if _screen_shape is None:
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_screen_shape = _screen_shape_tput
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if IS_NIX:
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_screen_shape = _screen_shape_linux
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return _screen_shape
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def _screen_shape_windows(fp): # pragma: no cover
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try:
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import struct
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from ctypes import create_string_buffer, windll
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from sys import stdin, stdout
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io_handle = -12 # assume stderr
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if fp == stdin:
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io_handle = -10
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elif fp == stdout:
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io_handle = -11
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h = windll.kernel32.GetStdHandle(io_handle)
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csbi = create_string_buffer(22)
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res = windll.kernel32.GetConsoleScreenBufferInfo(h, csbi)
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if res:
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(_bufx, _bufy, _curx, _cury, _wattr, left, top, right, bottom,
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_maxx, _maxy) = struct.unpack("hhhhHhhhhhh", csbi.raw)
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return right - left, bottom - top # +1
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except Exception: # nosec
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pass
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return None, None
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def _screen_shape_tput(*_): # pragma: no cover
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"""cygwin xterm (windows)"""
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try:
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import shlex
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from subprocess import check_call # nosec
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return [int(check_call(shlex.split('tput ' + i))) - 1
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for i in ('cols', 'lines')]
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except Exception: # nosec
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pass
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return None, None
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def _screen_shape_linux(fp): # pragma: no cover
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try:
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from array import array
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from fcntl import ioctl
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from termios import TIOCGWINSZ
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except ImportError:
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return None, None
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else:
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try:
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rows, cols = array('h', ioctl(fp, TIOCGWINSZ, '\0' * 8))[:2]
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return cols, rows
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except Exception:
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try:
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return [int(os.environ[i]) - 1 for i in ("COLUMNS", "LINES")]
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except (KeyError, ValueError):
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return None, None
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def _environ_cols_wrapper(): # pragma: no cover
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"""
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Return a function which returns console width.
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Supported: linux, osx, windows, cygwin.
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"""
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warn("Use `_screen_shape_wrapper()(file)[0]` instead of"
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" `_environ_cols_wrapper()(file)`", DeprecationWarning, stacklevel=2)
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shape = _screen_shape_wrapper()
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if not shape:
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return None
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@wraps(shape)
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def inner(fp):
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return shape(fp)[0]
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return inner
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def _term_move_up(): # pragma: no cover
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return '' if (os.name == 'nt') and (colorama is None) else '\x1b[A'
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try:
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# TODO consider using wcswidth third-party package for 0-width characters
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from unicodedata import east_asian_width
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except ImportError:
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_text_width = len
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else:
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def _text_width(s):
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return sum(2 if east_asian_width(ch) in 'FW' else 1 for ch in _unicode(s))
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def disp_len(data):
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"""
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Returns the real on-screen length of a string which may contain
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ANSI control codes and wide chars.
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"""
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return _text_width(RE_ANSI.sub('', data))
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def disp_trim(data, length):
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"""
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Trim a string which may contain ANSI control characters.
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"""
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if len(data) == disp_len(data):
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return data[:length]
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ansi_present = bool(RE_ANSI.search(data))
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while disp_len(data) > length: # carefully delete one char at a time
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data = data[:-1]
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if ansi_present and bool(RE_ANSI.search(data)):
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# assume ANSI reset is required
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return data if data.endswith("\033[0m") else data + "\033[0m"
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return data
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