Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/site-packages/pip/utils/ui.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 from __future__ import absolute_import
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2 from __future__ import division
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3
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4 import itertools
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5 import sys
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6 from signal import signal, SIGINT, default_int_handler
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7
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8 from pip.compat import WINDOWS
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9 from pip.utils import format_size
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10 from pip.utils.logging import get_indentation
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11 from pip._vendor import six
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12 from pip._vendor.progress.bar import Bar, IncrementalBar
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13 from pip._vendor.progress.helpers import WritelnMixin
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14 from pip._vendor.progress.spinner import Spinner
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15
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16 try:
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17 from pip._vendor import colorama
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18 # Lots of different errors can come from this, including SystemError and
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19 # ImportError.
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20 except Exception:
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21 colorama = None
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22
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23
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24 def _select_progress_class(preferred, fallback):
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25 encoding = getattr(preferred.file, "encoding", None)
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26
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27 # If we don't know what encoding this file is in, then we'll just assume
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28 # that it doesn't support unicode and use the ASCII bar.
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29 if not encoding:
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30 return fallback
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31
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32 # Collect all of the possible characters we want to use with the preferred
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33 # bar.
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34 characters = [
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35 getattr(preferred, "empty_fill", six.text_type()),
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36 getattr(preferred, "fill", six.text_type()),
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37 ]
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38 characters += list(getattr(preferred, "phases", []))
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39
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40 # Try to decode the characters we're using for the bar using the encoding
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41 # of the given file, if this works then we'll assume that we can use the
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42 # fancier bar and if not we'll fall back to the plaintext bar.
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43 try:
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44 six.text_type().join(characters).encode(encoding)
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45 except UnicodeEncodeError:
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46 return fallback
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47 else:
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48 return preferred
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49
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50
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51 _BaseBar = _select_progress_class(IncrementalBar, Bar)
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52
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53
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54 class InterruptibleMixin(object):
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55 """
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56 Helper to ensure that self.finish() gets called on keyboard interrupt.
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57
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58 This allows downloads to be interrupted without leaving temporary state
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59 (like hidden cursors) behind.
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60
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61 This class is similar to the progress library's existing SigIntMixin
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62 helper, but as of version 1.2, that helper has the following problems:
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63
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64 1. It calls sys.exit().
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65 2. It discards the existing SIGINT handler completely.
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66 3. It leaves its own handler in place even after an uninterrupted finish,
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67 which will have unexpected delayed effects if the user triggers an
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68 unrelated keyboard interrupt some time after a progress-displaying
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69 download has already completed, for example.
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70 """
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71
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72 def __init__(self, *args, **kwargs):
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73 """
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74 Save the original SIGINT handler for later.
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75 """
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76 super(InterruptibleMixin, self).__init__(*args, **kwargs)
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77
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78 self.original_handler = signal(SIGINT, self.handle_sigint)
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79
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80 # If signal() returns None, the previous handler was not installed from
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81 # Python, and we cannot restore it. This probably should not happen,
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82 # but if it does, we must restore something sensible instead, at least.
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83 # The least bad option should be Python's default SIGINT handler, which
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84 # just raises KeyboardInterrupt.
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85 if self.original_handler is None:
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86 self.original_handler = default_int_handler
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87
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88 def finish(self):
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89 """
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90 Restore the original SIGINT handler after finishing.
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91
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92 This should happen regardless of whether the progress display finishes
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93 normally, or gets interrupted.
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94 """
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95 super(InterruptibleMixin, self).finish()
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96 signal(SIGINT, self.original_handler)
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97
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98 def handle_sigint(self, signum, frame):
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99 """
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100 Call self.finish() before delegating to the original SIGINT handler.
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101
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102 This handler should only be in place while the progress display is
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103 active.
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104 """
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105 self.finish()
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106 self.original_handler(signum, frame)
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107
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108
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109 class DownloadProgressMixin(object):
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110
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111 def __init__(self, *args, **kwargs):
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112 super(DownloadProgressMixin, self).__init__(*args, **kwargs)
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113 self.message = (" " * (get_indentation() + 2)) + self.message
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114
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115 @property
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116 def downloaded(self):
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117 return format_size(self.index)
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118
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119 @property
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120 def download_speed(self):
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121 # Avoid zero division errors...
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122 if self.avg == 0.0:
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123 return "..."
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124 return format_size(1 / self.avg) + "/s"
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125
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126 @property
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127 def pretty_eta(self):
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128 if self.eta:
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129 return "eta %s" % self.eta_td
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130 return ""
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131
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132 def iter(self, it, n=1):
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133 for x in it:
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134 yield x
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135 self.next(n)
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136 self.finish()
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137
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138
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139 class WindowsMixin(object):
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140
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141 def __init__(self, *args, **kwargs):
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142 # The Windows terminal does not support the hide/show cursor ANSI codes
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143 # even with colorama. So we'll ensure that hide_cursor is False on
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144 # Windows.
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145 # This call neds to go before the super() call, so that hide_cursor
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146 # is set in time. The base progress bar class writes the "hide cursor"
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147 # code to the terminal in its init, so if we don't set this soon
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148 # enough, we get a "hide" with no corresponding "show"...
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149 if WINDOWS and self.hide_cursor:
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150 self.hide_cursor = False
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151
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152 super(WindowsMixin, self).__init__(*args, **kwargs)
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153
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154 # Check if we are running on Windows and we have the colorama module,
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155 # if we do then wrap our file with it.
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156 if WINDOWS and colorama:
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157 self.file = colorama.AnsiToWin32(self.file)
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158 # The progress code expects to be able to call self.file.isatty()
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159 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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160 # add it.
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161 self.file.isatty = lambda: self.file.wrapped.isatty()
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162 # The progress code expects to be able to call self.file.flush()
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163 # but the colorama.AnsiToWin32() object doesn't have that, so we'll
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164 # add it.
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165 self.file.flush = lambda: self.file.wrapped.flush()
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166
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167
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168 class DownloadProgressBar(WindowsMixin, InterruptibleMixin,
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169 DownloadProgressMixin, _BaseBar):
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170
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171 file = sys.stdout
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172 message = "%(percent)d%%"
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173 suffix = "%(downloaded)s %(download_speed)s %(pretty_eta)s"
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174
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175
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176 class DownloadProgressSpinner(WindowsMixin, InterruptibleMixin,
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177 DownloadProgressMixin, WritelnMixin, Spinner):
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178
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179 file = sys.stdout
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180 suffix = "%(downloaded)s %(download_speed)s"
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181
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182 def next_phase(self):
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183 if not hasattr(self, "_phaser"):
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184 self._phaser = itertools.cycle(self.phases)
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185 return next(self._phaser)
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186
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187 def update(self):
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188 message = self.message % self
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189 phase = self.next_phase()
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190 suffix = self.suffix % self
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191 line = ''.join([
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192 message,
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193 " " if message else "",
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194 phase,
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195 " " if suffix else "",
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196 suffix,
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197 ])
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198
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199 self.writeln(line)