Mercurial > repos > guerler > springsuite
annotate planemo/lib/python3.7/site-packages/pip/_internal/utils/ui.py @ 1:56ad4e20f292 draft
"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author | guerler |
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date | Fri, 31 Jul 2020 00:32:28 -0400 |
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1
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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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31 |
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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") |