annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/ui.py @ 1:56ad4e20f292 draft

"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 from __future__ import absolute_import, division
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2
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3 import contextlib
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4 import itertools
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5 import logging
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6 import sys
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7 import time
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8 from signal import SIGINT, default_int_handler, signal
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9
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10 from pip._vendor import six
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11 from pip._vendor.progress import HIDE_CURSOR, SHOW_CURSOR
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12 from pip._vendor.progress.bar import Bar, FillingCirclesBar, IncrementalBar
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13 from pip._vendor.progress.spinner import Spinner
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14
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15 from pip._internal.utils.compat import WINDOWS
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16 from pip._internal.utils.logging import get_indentation
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17 from pip._internal.utils.misc import format_size
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18 from pip._internal.utils.typing import MYPY_CHECK_RUNNING
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19
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20 if MYPY_CHECK_RUNNING:
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21 from typing import Any, Iterator, IO
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22
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23 try:
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24 from pip._vendor import colorama
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25 # Lots of different errors can come from this, including SystemError and
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26 # ImportError.
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27 except Exception:
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28 colorama = None
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29
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30 logger = logging.getLogger(__name__)
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32
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33 def _select_progress_class(preferred, fallback):
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34 encoding = getattr(preferred.file, "encoding", None)
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35
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36 # If we don't know what encoding this file is in, then we'll just assume
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37 # that it doesn't support unicode and use the ASCII bar.
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38 if not encoding:
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39 return fallback
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40
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41 # Collect all of the possible characters we want to use with the preferred
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42 # bar.
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43 characters = [
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44 getattr(preferred, "empty_fill", six.text_type()),
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45 getattr(preferred, "fill", six.text_type()),
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46 ]
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47 characters += list(getattr(preferred, "phases", []))
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48
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49 # Try to decode the characters we're using for the bar using the encoding
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50 # of the given file, if this works then we'll assume that we can use the
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51 # fancier bar and if not we'll fall back to the plaintext bar.
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52 try:
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53 six.text_type().join(characters).encode(encoding)
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54 except UnicodeEncodeError:
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55 return fallback
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56 else:
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57 return preferred
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58
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59
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60 _BaseBar = _select_progress_class(IncrementalBar, Bar) # type: Any
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61
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62
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63 class InterruptibleMixin(object):
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64 """
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65 Helper to ensure that self.finish() gets called on keyboard interrupt.
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66
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67 This allows downloads to be interrupted without leaving temporary state
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68 (like hidden cursors) behind.
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69
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70 This class is similar to the progress library's existing SigIntMixin
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71 helper, but as of version 1.2, that helper has the following problems:
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72
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73 1. It calls sys.exit().
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74 2. It discards the existing SIGINT handler completely.
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75 3. It leaves its own handler in place even after an uninterrupted finish,
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76 which will have unexpected delayed effects if the user triggers an
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77 unrelated keyboard interrupt some time after a progress-displaying
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78 download has already completed, for example.
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79 """
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80
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81 def __init__(self, *args, **kwargs):
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82 """
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83 Save the original SIGINT handler for later.
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84 """
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85 super(InterruptibleMixin, self).__init__(*args, **kwargs)
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86
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87 self.original_handler = signal(SIGINT, self.handle_sigint)
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88
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89 # If signal() returns None, the previous handler was not installed from
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90 # Python, and we cannot restore it. This probably should not happen,
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91 # but if it does, we must restore something sensible instead, at least.
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92 # The least bad option should be Python's default SIGINT handler, which
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93 # just raises KeyboardInterrupt.
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94 if self.original_handler is None:
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95 self.original_handler = default_int_handler
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96
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97 def finish(self):
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98 """
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99 Restore the original SIGINT handler after finishing.
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100
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101 This should happen regardless of whether the progress display finishes
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102 normally, or gets interrupted.
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103 """
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104 super(InterruptibleMixin, self).finish()
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105 signal(SIGINT, self.original_handler)
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106
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107 def handle_sigint(self, signum, frame):
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108 """
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109 Call self.finish() before delegating to the original SIGINT handler.
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110
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111 This handler should only be in place while the progress display is
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112 active.
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113 """
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114 self.finish()
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115 self.original_handler(signum, frame)
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116
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117
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118 class SilentBar(Bar):
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119
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120 def update(self):
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121 pass
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122
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123
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124 class BlueEmojiBar(IncrementalBar):
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125
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126 suffix = "%(percent)d%%"
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127 bar_prefix = " "
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128 bar_suffix = " "
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129 phases = (u"\U0001F539", u"\U0001F537", u"\U0001F535") # type: Any
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130
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131
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132 class DownloadProgressMixin(object):
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133
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134 def __init__(self, *args, **kwargs):
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135 super(DownloadProgressMixin, self).__init__(*args, **kwargs)
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136 self.message = (" " * (get_indentation() + 2)) + self.message
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137
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138 @property
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139 def downloaded(self):
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140 return format_size(self.index)
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141
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142 @property
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143 def download_speed(self):
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144 # Avoid zero division errors...
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145 if self.avg == 0.0:
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146 return "..."
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147 return format_size(1 / self.avg) + "/s"
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148
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149 @property
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150 def pretty_eta(self):
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151 if self.eta:
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152 return "eta %s" % self.eta_td
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153 return ""
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154
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155 def iter(self, it, n=1):
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156 for x in it:
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157 yield x
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158 self.next(n)
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159 self.finish()
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160
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161
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162 class WindowsMixin(object):
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163
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164 def __init__(self, *args, **kwargs):
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165 # The Windows terminal does not support the hide/show cursor ANSI codes
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166 # even with colorama. So we'll ensure that hide_cursor is False on
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167 # Windows.
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168 # This call needs to go before the super() call, so that hide_cursor
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169 # is set in time. The base progress bar class writes the "hide cursor"
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170 # code to the terminal in its init, so if we don't set this soon
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171 # enough, we get a "hide" with no corresponding "show"...
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172 if WINDOWS and self.hide_cursor:
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173 self.hide_cursor = False
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174
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175 super(WindowsMixin, self).__init__(*args, **kwargs)
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176
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177 # Check if we are running on Windows and we have the colorama module,
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178 # if we do then wrap our file with it.
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179 if WINDOWS and colorama:
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180 self.file = colorama.AnsiToWin32(self.file)
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181 # The progress code expects to be able to call self.file.isatty()
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182 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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183 # add it.
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184 self.file.isatty = lambda: self.file.wrapped.isatty()
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185 # The progress code expects to be able to call self.file.flush()
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186 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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187 # add it.
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188 self.file.flush = lambda: self.file.wrapped.flush()
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189
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190
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191 class BaseDownloadProgressBar(WindowsMixin, InterruptibleMixin,
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192 DownloadProgressMixin):
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193
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194 file = sys.stdout
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195 message = "%(percent)d%%"
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196 suffix = "%(downloaded)s %(download_speed)s %(pretty_eta)s"
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197
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198 # NOTE: The "type: ignore" comments on the following classes are there to
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199 # work around https://github.com/python/typing/issues/241
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200
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201
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202 class DefaultDownloadProgressBar(BaseDownloadProgressBar,
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203 _BaseBar):
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204 pass
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205
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206
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207 class DownloadSilentBar(BaseDownloadProgressBar, SilentBar): # type: ignore
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208 pass
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209
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210
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211 class DownloadBar(BaseDownloadProgressBar, # type: ignore
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212 Bar):
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213 pass
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214
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215
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216 class DownloadFillingCirclesBar(BaseDownloadProgressBar, # type: ignore
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217 FillingCirclesBar):
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218 pass
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219
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220
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221 class DownloadBlueEmojiProgressBar(BaseDownloadProgressBar, # type: ignore
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222 BlueEmojiBar):
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223 pass
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224
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225
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226 class DownloadProgressSpinner(WindowsMixin, InterruptibleMixin,
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227 DownloadProgressMixin, Spinner):
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228
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229 file = sys.stdout
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230 suffix = "%(downloaded)s %(download_speed)s"
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231
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232 def next_phase(self):
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233 if not hasattr(self, "_phaser"):
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234 self._phaser = itertools.cycle(self.phases)
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235 return next(self._phaser)
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236
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237 def update(self):
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238 message = self.message % self
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239 phase = self.next_phase()
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240 suffix = self.suffix % self
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241 line = ''.join([
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242 message,
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243 " " if message else "",
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244 phase,
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245 " " if suffix else "",
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246 suffix,
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247 ])
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248
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249 self.writeln(line)
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250
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251
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252 BAR_TYPES = {
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253 "off": (DownloadSilentBar, DownloadSilentBar),
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254 "on": (DefaultDownloadProgressBar, DownloadProgressSpinner),
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255 "ascii": (DownloadBar, DownloadProgressSpinner),
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256 "pretty": (DownloadFillingCirclesBar, DownloadProgressSpinner),
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257 "emoji": (DownloadBlueEmojiProgressBar, DownloadProgressSpinner)
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258 }
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259
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260
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261 def DownloadProgressProvider(progress_bar, max=None):
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262 if max is None or max == 0:
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263 return BAR_TYPES[progress_bar][1]().iter
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264 else:
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265 return BAR_TYPES[progress_bar][0](max=max).iter
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266
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267
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268 ################################################################
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269 # Generic "something is happening" spinners
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270 #
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271 # We don't even try using progress.spinner.Spinner here because it's actually
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272 # simpler to reimplement from scratch than to coerce their code into doing
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273 # what we need.
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274 ################################################################
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275
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276 @contextlib.contextmanager
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277 def hidden_cursor(file):
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278 # type: (IO) -> Iterator[None]
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279 # The Windows terminal does not support the hide/show cursor ANSI codes,
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280 # even via colorama. So don't even try.
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281 if WINDOWS:
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282 yield
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283 # We don't want to clutter the output with control characters if we're
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284 # writing to a file, or if the user is running with --quiet.
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285 # See https://github.com/pypa/pip/issues/3418
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286 elif not file.isatty() or logger.getEffectiveLevel() > logging.INFO:
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287 yield
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288 else:
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289 file.write(HIDE_CURSOR)
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290 try:
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291 yield
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292 finally:
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293 file.write(SHOW_CURSOR)
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294
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295
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296 class RateLimiter(object):
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297 def __init__(self, min_update_interval_seconds):
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298 # type: (float) -> None
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299 self._min_update_interval_seconds = min_update_interval_seconds
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300 self._last_update = 0 # type: float
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301
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302 def ready(self):
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303 # type: () -> bool
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304 now = time.time()
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305 delta = now - self._last_update
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306 return delta >= self._min_update_interval_seconds
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307
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308 def reset(self):
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309 # type: () -> None
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310 self._last_update = time.time()
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311
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312
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313 class SpinnerInterface(object):
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314 def spin(self):
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315 # type: () -> None
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316 raise NotImplementedError()
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317
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318 def finish(self, final_status):
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319 # type: (str) -> None
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320 raise NotImplementedError()
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321
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322
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323 class InteractiveSpinner(SpinnerInterface):
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324 def __init__(self, message, file=None, spin_chars="-\\|/",
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325 # Empirically, 8 updates/second looks nice
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326 min_update_interval_seconds=0.125):
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327 self._message = message
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328 if file is None:
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329 file = sys.stdout
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330 self._file = file
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331 self._rate_limiter = RateLimiter(min_update_interval_seconds)
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332 self._finished = False
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333
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334 self._spin_cycle = itertools.cycle(spin_chars)
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335
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336 self._file.write(" " * get_indentation() + self._message + " ... ")
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337 self._width = 0
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338
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339 def _write(self, status):
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340 assert not self._finished
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341 # Erase what we wrote before by backspacing to the beginning, writing
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342 # spaces to overwrite the old text, and then backspacing again
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343 backup = "\b" * self._width
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344 self._file.write(backup + " " * self._width + backup)
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345 # Now we have a blank slate to add our status
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346 self._file.write(status)
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347 self._width = len(status)
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348 self._file.flush()
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349 self._rate_limiter.reset()
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350
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351 def spin(self):
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352 # type: () -> None
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353 if self._finished:
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354 return
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355 if not self._rate_limiter.ready():
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356 return
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357 self._write(next(self._spin_cycle))
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358
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359 def finish(self, final_status):
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360 # type: (str) -> None
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361 if self._finished:
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362 return
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363 self._write(final_status)
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364 self._file.write("\n")
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365 self._file.flush()
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366 self._finished = True
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367
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368
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369 # Used for dumb terminals, non-interactive installs (no tty), etc.
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370 # We still print updates occasionally (once every 60 seconds by default) to
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371 # act as a keep-alive for systems like Travis-CI that take lack-of-output as
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372 # an indication that a task has frozen.
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373 class NonInteractiveSpinner(SpinnerInterface):
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374 def __init__(self, message, min_update_interval_seconds=60):
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375 # type: (str, float) -> None
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376 self._message = message
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377 self._finished = False
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378 self._rate_limiter = RateLimiter(min_update_interval_seconds)
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379 self._update("started")
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380
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381 def _update(self, status):
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382 assert not self._finished
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383 self._rate_limiter.reset()
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384 logger.info("%s: %s", self._message, status)
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385
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386 def spin(self):
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387 # type: () -> None
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388 if self._finished:
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389 return
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390 if not self._rate_limiter.ready():
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391 return
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392 self._update("still running...")
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393
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394 def finish(self, final_status):
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395 # type: (str) -> None
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396 if self._finished:
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397 return
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398 self._update("finished with status '%s'" % (final_status,))
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399 self._finished = True
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400
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401
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402 @contextlib.contextmanager
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403 def open_spinner(message):
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404 # type: (str) -> Iterator[SpinnerInterface]
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405 # Interactive spinner goes directly to sys.stdout rather than being routed
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406 # through the logging system, but it acts like it has level INFO,
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407 # i.e. it's only displayed if we're at level INFO or better.
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408 # Non-interactive spinner goes through the logging system, so it is always
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409 # in sync with logging configuration.
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410 if sys.stdout.isatty() and logger.getEffectiveLevel() <= logging.INFO:
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411 spinner = InteractiveSpinner(message) # type: SpinnerInterface
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412 else:
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413 spinner = NonInteractiveSpinner(message)
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414 try:
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415 with hidden_cursor(sys.stdout):
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416 yield spinner
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417 except KeyboardInterrupt:
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418 spinner.finish("canceled")
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419 raise
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420 except Exception:
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421 spinner.finish("error")
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422 raise
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423 else:
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424 spinner.finish("done")