Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/click/utils.py @ 0:26e78fe6e8c4 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
parents
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 import os
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2 import sys
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3
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4 from ._compat import _default_text_stderr
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5 from ._compat import _default_text_stdout
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6 from ._compat import auto_wrap_for_ansi
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7 from ._compat import binary_streams
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8 from ._compat import filename_to_ui
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9 from ._compat import get_filesystem_encoding
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10 from ._compat import get_streerror
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11 from ._compat import is_bytes
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12 from ._compat import open_stream
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13 from ._compat import PY2
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14 from ._compat import should_strip_ansi
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15 from ._compat import string_types
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16 from ._compat import strip_ansi
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17 from ._compat import text_streams
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18 from ._compat import text_type
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19 from ._compat import WIN
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20 from .globals import resolve_color_default
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21
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22 if not PY2:
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23 from ._compat import _find_binary_writer
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24 elif WIN:
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25 from ._winconsole import _get_windows_argv
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26 from ._winconsole import _hash_py_argv
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27 from ._winconsole import _initial_argv_hash
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28
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29 echo_native_types = string_types + (bytes, bytearray)
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30
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31
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32 def _posixify(name):
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33 return "-".join(name.split()).lower()
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34
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35
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36 def safecall(func):
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37 """Wraps a function so that it swallows exceptions."""
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38
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39 def wrapper(*args, **kwargs):
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40 try:
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41 return func(*args, **kwargs)
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42 except Exception:
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43 pass
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44
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45 return wrapper
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46
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47
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48 def make_str(value):
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49 """Converts a value into a valid string."""
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50 if isinstance(value, bytes):
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51 try:
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52 return value.decode(get_filesystem_encoding())
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53 except UnicodeError:
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54 return value.decode("utf-8", "replace")
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55 return text_type(value)
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56
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57
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58 def make_default_short_help(help, max_length=45):
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59 """Return a condensed version of help string."""
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60 words = help.split()
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61 total_length = 0
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62 result = []
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63 done = False
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64
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65 for word in words:
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66 if word[-1:] == ".":
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67 done = True
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68 new_length = 1 + len(word) if result else len(word)
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69 if total_length + new_length > max_length:
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70 result.append("...")
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71 done = True
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72 else:
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73 if result:
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74 result.append(" ")
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75 result.append(word)
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76 if done:
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77 break
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78 total_length += new_length
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79
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80 return "".join(result)
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81
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82
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83 class LazyFile(object):
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84 """A lazy file works like a regular file but it does not fully open
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85 the file but it does perform some basic checks early to see if the
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86 filename parameter does make sense. This is useful for safely opening
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87 files for writing.
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88 """
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89
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90 def __init__(
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91 self, filename, mode="r", encoding=None, errors="strict", atomic=False
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92 ):
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93 self.name = filename
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94 self.mode = mode
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95 self.encoding = encoding
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96 self.errors = errors
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97 self.atomic = atomic
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98
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99 if filename == "-":
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100 self._f, self.should_close = open_stream(filename, mode, encoding, errors)
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101 else:
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102 if "r" in mode:
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103 # Open and close the file in case we're opening it for
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104 # reading so that we can catch at least some errors in
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105 # some cases early.
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106 open(filename, mode).close()
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107 self._f = None
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108 self.should_close = True
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109
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110 def __getattr__(self, name):
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111 return getattr(self.open(), name)
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112
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113 def __repr__(self):
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114 if self._f is not None:
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115 return repr(self._f)
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116 return "<unopened file '{}' {}>".format(self.name, self.mode)
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117
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118 def open(self):
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119 """Opens the file if it's not yet open. This call might fail with
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120 a :exc:`FileError`. Not handling this error will produce an error
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121 that Click shows.
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122 """
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123 if self._f is not None:
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124 return self._f
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125 try:
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126 rv, self.should_close = open_stream(
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127 self.name, self.mode, self.encoding, self.errors, atomic=self.atomic
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128 )
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129 except (IOError, OSError) as e: # noqa: E402
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130 from .exceptions import FileError
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131
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132 raise FileError(self.name, hint=get_streerror(e))
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133 self._f = rv
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134 return rv
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135
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136 def close(self):
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137 """Closes the underlying file, no matter what."""
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138 if self._f is not None:
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139 self._f.close()
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140
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141 def close_intelligently(self):
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142 """This function only closes the file if it was opened by the lazy
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143 file wrapper. For instance this will never close stdin.
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144 """
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145 if self.should_close:
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146 self.close()
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147
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148 def __enter__(self):
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149 return self
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150
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151 def __exit__(self, exc_type, exc_value, tb):
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152 self.close_intelligently()
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153
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154 def __iter__(self):
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155 self.open()
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156 return iter(self._f)
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157
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158
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159 class KeepOpenFile(object):
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160 def __init__(self, file):
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161 self._file = file
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162
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163 def __getattr__(self, name):
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164 return getattr(self._file, name)
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165
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166 def __enter__(self):
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167 return self
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168
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169 def __exit__(self, exc_type, exc_value, tb):
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170 pass
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171
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172 def __repr__(self):
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173 return repr(self._file)
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174
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175 def __iter__(self):
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176 return iter(self._file)
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177
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178
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179 def echo(message=None, file=None, nl=True, err=False, color=None):
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180 """Prints a message plus a newline to the given file or stdout. On
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181 first sight, this looks like the print function, but it has improved
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182 support for handling Unicode and binary data that does not fail no
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183 matter how badly configured the system is.
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184
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185 Primarily it means that you can print binary data as well as Unicode
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186 data on both 2.x and 3.x to the given file in the most appropriate way
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187 possible. This is a very carefree function in that it will try its
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188 best to not fail. As of Click 6.0 this includes support for unicode
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189 output on the Windows console.
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190
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191 In addition to that, if `colorama`_ is installed, the echo function will
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192 also support clever handling of ANSI codes. Essentially it will then
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193 do the following:
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194
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195 - add transparent handling of ANSI color codes on Windows.
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196 - hide ANSI codes automatically if the destination file is not a
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197 terminal.
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198
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199 .. _colorama: https://pypi.org/project/colorama/
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200
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201 .. versionchanged:: 6.0
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202 As of Click 6.0 the echo function will properly support unicode
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203 output on the windows console. Not that click does not modify
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204 the interpreter in any way which means that `sys.stdout` or the
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205 print statement or function will still not provide unicode support.
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206
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207 .. versionchanged:: 2.0
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208 Starting with version 2.0 of Click, the echo function will work
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209 with colorama if it's installed.
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210
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211 .. versionadded:: 3.0
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212 The `err` parameter was added.
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213
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214 .. versionchanged:: 4.0
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215 Added the `color` flag.
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216
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217 :param message: the message to print
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218 :param file: the file to write to (defaults to ``stdout``)
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219 :param err: if set to true the file defaults to ``stderr`` instead of
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220 ``stdout``. This is faster and easier than calling
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221 :func:`get_text_stderr` yourself.
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222 :param nl: if set to `True` (the default) a newline is printed afterwards.
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223 :param color: controls if the terminal supports ANSI colors or not. The
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224 default is autodetection.
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225 """
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226 if file is None:
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227 if err:
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228 file = _default_text_stderr()
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229 else:
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230 file = _default_text_stdout()
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231
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232 # Convert non bytes/text into the native string type.
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233 if message is not None and not isinstance(message, echo_native_types):
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234 message = text_type(message)
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235
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236 if nl:
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237 message = message or u""
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238 if isinstance(message, text_type):
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239 message += u"\n"
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240 else:
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241 message += b"\n"
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242
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243 # If there is a message, and we're in Python 3, and the value looks
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244 # like bytes, we manually need to find the binary stream and write the
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245 # message in there. This is done separately so that most stream
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246 # types will work as you would expect. Eg: you can write to StringIO
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247 # for other cases.
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248 if message and not PY2 and is_bytes(message):
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249 binary_file = _find_binary_writer(file)
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250 if binary_file is not None:
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251 file.flush()
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252 binary_file.write(message)
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253 binary_file.flush()
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254 return
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255
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256 # ANSI-style support. If there is no message or we are dealing with
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257 # bytes nothing is happening. If we are connected to a file we want
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258 # to strip colors. If we are on windows we either wrap the stream
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259 # to strip the color or we use the colorama support to translate the
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260 # ansi codes to API calls.
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261 if message and not is_bytes(message):
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262 color = resolve_color_default(color)
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263 if should_strip_ansi(file, color):
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264 message = strip_ansi(message)
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265 elif WIN:
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266 if auto_wrap_for_ansi is not None:
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267 file = auto_wrap_for_ansi(file)
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268 elif not color:
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269 message = strip_ansi(message)
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270
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271 if message:
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272 file.write(message)
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273 file.flush()
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274
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275
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276 def get_binary_stream(name):
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277 """Returns a system stream for byte processing. This essentially
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278 returns the stream from the sys module with the given name but it
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279 solves some compatibility issues between different Python versions.
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280 Primarily this function is necessary for getting binary streams on
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281 Python 3.
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282
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283 :param name: the name of the stream to open. Valid names are ``'stdin'``,
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284 ``'stdout'`` and ``'stderr'``
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285 """
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286 opener = binary_streams.get(name)
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287 if opener is None:
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288 raise TypeError("Unknown standard stream '{}'".format(name))
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289 return opener()
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290
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291
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292 def get_text_stream(name, encoding=None, errors="strict"):
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293 """Returns a system stream for text processing. This usually returns
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294 a wrapped stream around a binary stream returned from
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295 :func:`get_binary_stream` but it also can take shortcuts on Python 3
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296 for already correctly configured streams.
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297
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298 :param name: the name of the stream to open. Valid names are ``'stdin'``,
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299 ``'stdout'`` and ``'stderr'``
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300 :param encoding: overrides the detected default encoding.
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301 :param errors: overrides the default error mode.
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302 """
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303 opener = text_streams.get(name)
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304 if opener is None:
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305 raise TypeError("Unknown standard stream '{}'".format(name))
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306 return opener(encoding, errors)
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307
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308
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309 def open_file(
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310 filename, mode="r", encoding=None, errors="strict", lazy=False, atomic=False
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311 ):
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312 """This is similar to how the :class:`File` works but for manual
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313 usage. Files are opened non lazy by default. This can open regular
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314 files as well as stdin/stdout if ``'-'`` is passed.
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315
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316 If stdin/stdout is returned the stream is wrapped so that the context
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317 manager will not close the stream accidentally. This makes it possible
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318 to always use the function like this without having to worry to
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319 accidentally close a standard stream::
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320
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321 with open_file(filename) as f:
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322 ...
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323
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324 .. versionadded:: 3.0
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325
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326 :param filename: the name of the file to open (or ``'-'`` for stdin/stdout).
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327 :param mode: the mode in which to open the file.
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328 :param encoding: the encoding to use.
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329 :param errors: the error handling for this file.
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330 :param lazy: can be flipped to true to open the file lazily.
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331 :param atomic: in atomic mode writes go into a temporary file and it's
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332 moved on close.
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333 """
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334 if lazy:
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335 return LazyFile(filename, mode, encoding, errors, atomic=atomic)
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336 f, should_close = open_stream(filename, mode, encoding, errors, atomic=atomic)
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337 if not should_close:
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338 f = KeepOpenFile(f)
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339 return f
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340
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341
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342 def get_os_args():
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343 """This returns the argument part of sys.argv in the most appropriate
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344 form for processing. What this means is that this return value is in
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345 a format that works for Click to process but does not necessarily
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346 correspond well to what's actually standard for the interpreter.
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347
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348 On most environments the return value is ``sys.argv[:1]`` unchanged.
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349 However if you are on Windows and running Python 2 the return value
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350 will actually be a list of unicode strings instead because the
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351 default behavior on that platform otherwise will not be able to
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352 carry all possible values that sys.argv can have.
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353
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354 .. versionadded:: 6.0
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355 """
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356 # We can only extract the unicode argv if sys.argv has not been
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357 # changed since the startup of the application.
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358 if PY2 and WIN and _initial_argv_hash == _hash_py_argv():
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359 return _get_windows_argv()
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360 return sys.argv[1:]
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361
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362
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363 def format_filename(filename, shorten=False):
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364 """Formats a filename for user display. The main purpose of this
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365 function is to ensure that the filename can be displayed at all. This
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366 will decode the filename to unicode if necessary in a way that it will
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367 not fail. Optionally, it can shorten the filename to not include the
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368 full path to the filename.
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369
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370 :param filename: formats a filename for UI display. This will also convert
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371 the filename into unicode without failing.
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372 :param shorten: this optionally shortens the filename to strip of the
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373 path that leads up to it.
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374 """
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375 if shorten:
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376 filename = os.path.basename(filename)
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377 return filename_to_ui(filename)
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378
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379
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380 def get_app_dir(app_name, roaming=True, force_posix=False):
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381 r"""Returns the config folder for the application. The default behavior
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382 is to return whatever is most appropriate for the operating system.
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383
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384 To give you an idea, for an app called ``"Foo Bar"``, something like
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385 the following folders could be returned:
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386
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387 Mac OS X:
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388 ``~/Library/Application Support/Foo Bar``
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389 Mac OS X (POSIX):
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390 ``~/.foo-bar``
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391 Unix:
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392 ``~/.config/foo-bar``
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393 Unix (POSIX):
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394 ``~/.foo-bar``
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395 Win XP (roaming):
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396 ``C:\Documents and Settings\<user>\Local Settings\Application Data\Foo Bar``
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397 Win XP (not roaming):
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398 ``C:\Documents and Settings\<user>\Application Data\Foo Bar``
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399 Win 7 (roaming):
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400 ``C:\Users\<user>\AppData\Roaming\Foo Bar``
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401 Win 7 (not roaming):
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402 ``C:\Users\<user>\AppData\Local\Foo Bar``
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403
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404 .. versionadded:: 2.0
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405
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406 :param app_name: the application name. This should be properly capitalized
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407 and can contain whitespace.
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408 :param roaming: controls if the folder should be roaming or not on Windows.
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409 Has no affect otherwise.
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410 :param force_posix: if this is set to `True` then on any POSIX system the
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411 folder will be stored in the home folder with a leading
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412 dot instead of the XDG config home or darwin's
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413 application support folder.
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414 """
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415 if WIN:
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416 key = "APPDATA" if roaming else "LOCALAPPDATA"
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417 folder = os.environ.get(key)
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418 if folder is None:
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419 folder = os.path.expanduser("~")
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420 return os.path.join(folder, app_name)
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421 if force_posix:
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422 return os.path.join(os.path.expanduser("~/.{}".format(_posixify(app_name))))
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423 if sys.platform == "darwin":
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424 return os.path.join(
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425 os.path.expanduser("~/Library/Application Support"), app_name
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426 )
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427 return os.path.join(
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428 os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config")),
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429 _posixify(app_name),
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430 )
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431
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432
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433 class PacifyFlushWrapper(object):
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434 """This wrapper is used to catch and suppress BrokenPipeErrors resulting
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435 from ``.flush()`` being called on broken pipe during the shutdown/final-GC
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436 of the Python interpreter. Notably ``.flush()`` is always called on
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437 ``sys.stdout`` and ``sys.stderr``. So as to have minimal impact on any
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438 other cleanup code, and the case where the underlying file is not a broken
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439 pipe, all calls and attributes are proxied.
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440 """
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441
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442 def __init__(self, wrapped):
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443 self.wrapped = wrapped
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444
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445 def flush(self):
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446 try:
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447 self.wrapped.flush()
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448 except IOError as e:
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449 import errno
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450
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451 if e.errno != errno.EPIPE:
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452 raise
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453
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454 def __getattr__(self, attr):
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455 return getattr(self.wrapped, attr)