Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/pip/_internal/cli/spinners.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 import contextlib |
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2 import itertools |
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3 import logging |
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4 import sys |
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5 import time |
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6 |
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7 from pip._vendor.progress import HIDE_CURSOR, SHOW_CURSOR |
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8 |
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9 from pip._internal.utils.compat import WINDOWS |
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10 from pip._internal.utils.logging import get_indentation |
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11 from pip._internal.utils.typing import MYPY_CHECK_RUNNING |
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12 |
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13 if MYPY_CHECK_RUNNING: |
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14 from typing import IO, Iterator |
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15 |
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16 logger = logging.getLogger(__name__) |
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17 |
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18 |
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19 class SpinnerInterface: |
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20 def spin(self): |
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21 # type: () -> None |
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22 raise NotImplementedError() |
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23 |
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24 def finish(self, final_status): |
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25 # type: (str) -> None |
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26 raise NotImplementedError() |
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27 |
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28 |
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29 class InteractiveSpinner(SpinnerInterface): |
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30 def __init__(self, message, file=None, spin_chars="-\\|/", |
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31 # Empirically, 8 updates/second looks nice |
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32 min_update_interval_seconds=0.125): |
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33 # type: (str, IO[str], str, float) -> None |
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34 self._message = message |
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35 if file is None: |
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36 file = sys.stdout |
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37 self._file = file |
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38 self._rate_limiter = RateLimiter(min_update_interval_seconds) |
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39 self._finished = False |
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40 |
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41 self._spin_cycle = itertools.cycle(spin_chars) |
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42 |
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43 self._file.write(" " * get_indentation() + self._message + " ... ") |
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44 self._width = 0 |
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45 |
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46 def _write(self, status): |
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47 # type: (str) -> None |
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48 assert not self._finished |
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49 # Erase what we wrote before by backspacing to the beginning, writing |
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50 # spaces to overwrite the old text, and then backspacing again |
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51 backup = "\b" * self._width |
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52 self._file.write(backup + " " * self._width + backup) |
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53 # Now we have a blank slate to add our status |
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54 self._file.write(status) |
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55 self._width = len(status) |
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56 self._file.flush() |
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57 self._rate_limiter.reset() |
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58 |
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59 def spin(self): |
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60 # type: () -> None |
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61 if self._finished: |
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62 return |
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63 if not self._rate_limiter.ready(): |
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64 return |
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65 self._write(next(self._spin_cycle)) |
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66 |
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67 def finish(self, final_status): |
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68 # type: (str) -> None |
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69 if self._finished: |
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70 return |
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71 self._write(final_status) |
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72 self._file.write("\n") |
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73 self._file.flush() |
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74 self._finished = True |
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75 |
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76 |
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77 # Used for dumb terminals, non-interactive installs (no tty), etc. |
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78 # We still print updates occasionally (once every 60 seconds by default) to |
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79 # act as a keep-alive for systems like Travis-CI that take lack-of-output as |
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80 # an indication that a task has frozen. |
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81 class NonInteractiveSpinner(SpinnerInterface): |
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82 def __init__(self, message, min_update_interval_seconds=60): |
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83 # type: (str, float) -> None |
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84 self._message = message |
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85 self._finished = False |
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86 self._rate_limiter = RateLimiter(min_update_interval_seconds) |
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87 self._update("started") |
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88 |
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89 def _update(self, status): |
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90 # type: (str) -> None |
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91 assert not self._finished |
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92 self._rate_limiter.reset() |
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93 logger.info("%s: %s", self._message, status) |
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94 |
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95 def spin(self): |
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96 # type: () -> None |
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97 if self._finished: |
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98 return |
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99 if not self._rate_limiter.ready(): |
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100 return |
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101 self._update("still running...") |
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102 |
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103 def finish(self, final_status): |
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104 # type: (str) -> None |
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105 if self._finished: |
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106 return |
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107 self._update( |
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108 "finished with status '{final_status}'".format(**locals())) |
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109 self._finished = True |
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110 |
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111 |
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112 class RateLimiter: |
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113 def __init__(self, min_update_interval_seconds): |
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114 # type: (float) -> None |
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115 self._min_update_interval_seconds = min_update_interval_seconds |
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116 self._last_update = 0 # type: float |
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117 |
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118 def ready(self): |
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119 # type: () -> bool |
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120 now = time.time() |
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121 delta = now - self._last_update |
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122 return delta >= self._min_update_interval_seconds |
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123 |
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124 def reset(self): |
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125 # type: () -> None |
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126 self._last_update = time.time() |
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127 |
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128 |
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129 @contextlib.contextmanager |
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130 def open_spinner(message): |
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131 # type: (str) -> Iterator[SpinnerInterface] |
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132 # Interactive spinner goes directly to sys.stdout rather than being routed |
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133 # through the logging system, but it acts like it has level INFO, |
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134 # i.e. it's only displayed if we're at level INFO or better. |
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135 # Non-interactive spinner goes through the logging system, so it is always |
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136 # in sync with logging configuration. |
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137 if sys.stdout.isatty() and logger.getEffectiveLevel() <= logging.INFO: |
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138 spinner = InteractiveSpinner(message) # type: SpinnerInterface |
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139 else: |
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140 spinner = NonInteractiveSpinner(message) |
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141 try: |
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142 with hidden_cursor(sys.stdout): |
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143 yield spinner |
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144 except KeyboardInterrupt: |
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145 spinner.finish("canceled") |
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146 raise |
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147 except Exception: |
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148 spinner.finish("error") |
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149 raise |
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150 else: |
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151 spinner.finish("done") |
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152 |
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153 |
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154 @contextlib.contextmanager |
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155 def hidden_cursor(file): |
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156 # type: (IO[str]) -> Iterator[None] |
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157 # The Windows terminal does not support the hide/show cursor ANSI codes, |
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158 # even via colorama. So don't even try. |
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159 if WINDOWS: |
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160 yield |
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161 # We don't want to clutter the output with control characters if we're |
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162 # writing to a file, or if the user is running with --quiet. |
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163 # See https://github.com/pypa/pip/issues/3418 |
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164 elif not file.isatty() or logger.getEffectiveLevel() > logging.INFO: |
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165 yield |
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166 else: |
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167 file.write(HIDE_CURSOR) |
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168 try: |
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169 yield |
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170 finally: |
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171 file.write(SHOW_CURSOR) |