Mercurial > repos > bcclaywell > argo_navis

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

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
parents
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1 import os
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2 import sys
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3 from collections import deque
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4
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5 from .globals import resolve_color_default
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6
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7 from ._compat import text_type, open_stream, get_filesystem_encoding, \
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8 get_streerror, string_types, PY2, binary_streams, text_streams, \
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9 filename_to_ui, auto_wrap_for_ansi, strip_ansi, should_strip_ansi, \
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10 _default_text_stdout, _default_text_stderr, is_bytes, WIN
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11
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12 if not PY2:
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13 from ._compat import _find_binary_writer
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15
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16 echo_native_types = string_types + (bytes, bytearray)
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17
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18
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19 def _posixify(name):
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20 return '-'.join(name.split()).lower()
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21
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22
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23 def unpack_args(args, nargs_spec):
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24 """Given an iterable of arguments and an iterable of nargs specifications,
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25 it returns a tuple with all the unpacked arguments at the first index
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26 and all remaining arguments as the second.
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27
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28 The nargs specification is the number of arguments that should be consumed
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29 or `-1` to indicate that this position should eat up all the remainders.
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30
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31 Missing items are filled with `None`.
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32
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33 Examples:
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34
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35 >>> unpack_args(range(6), [1, 2, 1, -1])
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36 ((0, (1, 2), 3, (4, 5)), [])
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37 >>> unpack_args(range(6), [1, 2, 1])
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38 ((0, (1, 2), 3), [4, 5])
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39 >>> unpack_args(range(6), [-1])
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40 (((0, 1, 2, 3, 4, 5),), [])
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41 >>> unpack_args(range(6), [1, 1])
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42 ((0, 1), [2, 3, 4, 5])
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43 >>> unpack_args(range(6), [-1,1,1,1,1])
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44 (((0, 1), 2, 3, 4, 5), [])
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45 """
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46 args = deque(args)
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47 nargs_spec = deque(nargs_spec)
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48 rv = []
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49 spos = None
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50
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51 def _fetch(c):
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52 try:
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53 if spos is None:
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54 return c.popleft()
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55 else:
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56 return c.pop()
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57 except IndexError:
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58 return None
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59
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60 while nargs_spec:
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61 nargs = _fetch(nargs_spec)
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62 if nargs == 1:
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63 rv.append(_fetch(args))
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64 elif nargs > 1:
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65 x = [_fetch(args) for _ in range(nargs)]
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66 # If we're reversed, we're pulling in the arguments in reverse,
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67 # so we need to turn them around.
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68 if spos is not None:
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69 x.reverse()
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70 rv.append(tuple(x))
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71 elif nargs < 0:
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72 if spos is not None:
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73 raise TypeError('Cannot have two nargs < 0')
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74 spos = len(rv)
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75 rv.append(None)
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76
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77 # spos is the position of the wildcard (star). If it's not `None`,
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78 # we fill it with the remainder.
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79 if spos is not None:
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80 rv[spos] = tuple(args)
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81 args = []
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82 rv[spos + 1:] = reversed(rv[spos + 1:])
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83
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84 return tuple(rv), list(args)
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85
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86
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87 def safecall(func):
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88 """Wraps a function so that it swallows exceptions."""
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89 def wrapper(*args, **kwargs):
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90 try:
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91 return func(*args, **kwargs)
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92 except Exception:
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93 pass
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94 return wrapper
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95
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96
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97 def make_str(value):
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98 """Converts a value into a valid string."""
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99 if isinstance(value, bytes):
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100 try:
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101 return value.decode(get_filesystem_encoding())
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102 except UnicodeError:
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103 return value.decode('utf-8', 'replace')
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104 return text_type(value)
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105
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106
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107 def make_default_short_help(help, max_length=45):
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108 words = help.split()
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109 total_length = 0
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110 result = []
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111 done = False
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112
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113 for word in words:
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114 if word[-1:] == '.':
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115 done = True
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116 new_length = result and 1 + len(word) or len(word)
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117 if total_length + new_length > max_length:
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118 result.append('...')
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119 done = True
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120 else:
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121 if result:
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122 result.append(' ')
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123 result.append(word)
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124 if done:
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125 break
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126 total_length += new_length
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127
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128 return ''.join(result)
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129
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130
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131 class LazyFile(object):
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132 """A lazy file works like a regular file but it does not fully open
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133 the file but it does perform some basic checks early to see if the
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134 filename parameter does make sense. This is useful for safely opening
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135 files for writing.
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136 """
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137
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138 def __init__(self, filename, mode='r', encoding=None, errors='strict',
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139 atomic=False):
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140 self.name = filename
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141 self.mode = mode
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142 self.encoding = encoding
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143 self.errors = errors
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144 self.atomic = atomic
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145
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146 if filename == '-':
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147 self._f, self.should_close = open_stream(filename, mode,
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148 encoding, errors)
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149 else:
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150 if 'r' in mode:
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151 # Open and close the file in case we're opening it for
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152 # reading so that we can catch at least some errors in
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153 # some cases early.
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154 open(filename, mode).close()
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155 self._f = None
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156 self.should_close = True
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157
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158 def __getattr__(self, name):
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159 return getattr(self.open(), name)
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160
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161 def __repr__(self):
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162 if self._f is not None:
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163 return repr(self._f)
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164 return '<unopened file %r %s>' % (self.name, self.mode)
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165
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166 def open(self):
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167 """Opens the file if it's not yet open. This call might fail with
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168 a :exc:`FileError`. Not handling this error will produce an error
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169 that Click shows.
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170 """
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171 if self._f is not None:
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172 return self._f
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173 try:
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174 rv, self.should_close = open_stream(self.name, self.mode,
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175 self.encoding,
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176 self.errors,
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177 atomic=self.atomic)
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178 except (IOError, OSError) as e:
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179 from .exceptions import FileError
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180 raise FileError(self.name, hint=get_streerror(e))
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181 self._f = rv
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182 return rv
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183
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184 def close(self):
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185 """Closes the underlying file, no matter what."""
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186 if self._f is not None:
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187 self._f.close()
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188
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189 def close_intelligently(self):
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190 """This function only closes the file if it was opened by the lazy
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191 file wrapper. For instance this will never close stdin.
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192 """
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193 if self.should_close:
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194 self.close()
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195
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196 def __enter__(self):
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197 return self
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198
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199 def __exit__(self, exc_type, exc_value, tb):
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200 self.close_intelligently()
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201
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202 def __iter__(self):
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203 self.open()
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204 return iter(self._f)
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205
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206
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207 class KeepOpenFile(object):
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208
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209 def __init__(self, file):
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210 self._file = file
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211
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212 def __getattr__(self, name):
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213 return getattr(self._file, name)
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214
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215 def __enter__(self):
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216 return self
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217
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218 def __exit__(self, exc_type, exc_value, tb):
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219 pass
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220
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221 def __repr__(self):
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222 return repr(self._file)
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223
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224 def __iter__(self):
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225 return iter(self._file)
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226
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227
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228 def echo(message=None, file=None, nl=True, err=False, color=None):
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229 """Prints a message plus a newline to the given file or stdout. On
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230 first sight, this looks like the print function, but it has improved
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231 support for handling Unicode and binary data that does not fail no
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232 matter how badly configured the system is.
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233
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234 Primarily it means that you can print binary data as well as Unicode
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235 data on both 2.x and 3.x to the given file in the most appropriate way
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236 possible. This is a very carefree function as in that it will try its
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237 best to not fail.
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238
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239 In addition to that, if `colorama`_ is installed, the echo function will
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240 also support clever handling of ANSI codes. Essentially it will then
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241 do the following:
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242
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243 - add transparent handling of ANSI color codes on Windows.
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244 - hide ANSI codes automatically if the destination file is not a
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245 terminal.
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246
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247 .. _colorama: http://pypi.python.org/pypi/colorama
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248
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249 .. versionchanged:: 2.0
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250 Starting with version 2.0 of Click, the echo function will work
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251 with colorama if it's installed.
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252
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253 .. versionadded:: 3.0
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254 The `err` parameter was added.
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255
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256 .. versionchanged:: 4.0
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257 Added the `color` flag.
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258
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259 :param message: the message to print
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260 :param file: the file to write to (defaults to ``stdout``)
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261 :param err: if set to true the file defaults to ``stderr`` instead of
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262 ``stdout``. This is faster and easier than calling
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263 :func:`get_text_stderr` yourself.
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264 :param nl: if set to `True` (the default) a newline is printed afterwards.
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265 :param color: controls if the terminal supports ANSI colors or not. The
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266 default is autodetection.
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267 """
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268 if file is None:
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269 if err:
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270 file = _default_text_stderr()
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271 else:
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272 file = _default_text_stdout()
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273
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274 # Convert non bytes/text into the native string type.
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275 if message is not None and not isinstance(message, echo_native_types):
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276 message = text_type(message)
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277
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278 if nl:
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279 message = message or u''
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280 if isinstance(message, text_type):
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281 message += u'\n'
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282 else:
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283 message += b'\n'
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284
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285 # If there is a message, and we're in Python 3, and the value looks
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286 # like bytes, we manually need to find the binary stream and write the
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287 # message in there. This is done separately so that most stream
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288 # types will work as you would expect. Eg: you can write to StringIO
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289 # for other cases.
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290 if message and not PY2 and is_bytes(message):
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291 binary_file = _find_binary_writer(file)
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292 if binary_file is not None:
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293 file.flush()
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294 binary_file.write(message)
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295 binary_file.flush()
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296 return
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297
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298 # ANSI-style support. If there is no message or we are dealing with
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299 # bytes nothing is happening. If we are connected to a file we want
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300 # to strip colors. If we are on windows we either wrap the stream
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301 # to strip the color or we use the colorama support to translate the
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302 # ansi codes to API calls.
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303 if message and not is_bytes(message):
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304 color = resolve_color_default(color)
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305 if should_strip_ansi(file, color):
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306 message = strip_ansi(message)
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307 elif WIN:
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308 if auto_wrap_for_ansi is not None:
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309 file = auto_wrap_for_ansi(file)
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310 elif not color:
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311 message = strip_ansi(message)
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312
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313 if message:
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314 file.write(message)
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315 file.flush()
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316
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317
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318 def get_binary_stream(name):
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319 """Returns a system stream for byte processing. This essentially
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320 returns the stream from the sys module with the given name but it
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321 solves some compatibility issues between different Python versions.
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322 Primarily this function is necessary for getting binary streams on
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323 Python 3.
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324
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325 :param name: the name of the stream to open. Valid names are ``'stdin'``,
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326 ``'stdout'`` and ``'stderr'``
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327 """
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328 opener = binary_streams.get(name)
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329 if opener is None:
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330 raise TypeError('Unknown standard stream %r' % name)
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331 return opener()
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332
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333
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334 def get_text_stream(name, encoding=None, errors='strict'):
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335 """Returns a system stream for text processing. This usually returns
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336 a wrapped stream around a binary stream returned from
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337 :func:`get_binary_stream` but it also can take shortcuts on Python 3
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338 for already correctly configured streams.
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339
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340 :param name: the name of the stream to open. Valid names are ``'stdin'``,
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341 ``'stdout'`` and ``'stderr'``
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342 :param encoding: overrides the detected default encoding.
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343 :param errors: overrides the default error mode.
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344 """
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345 opener = text_streams.get(name)
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346 if opener is None:
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347 raise TypeError('Unknown standard stream %r' % name)
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348 return opener(encoding, errors)
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349
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350
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351 def open_file(filename, mode='r', encoding=None, errors='strict',
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352 lazy=False, atomic=False):
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353 """This is similar to how the :class:`File` works but for manual
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354 usage. Files are opened non lazy by default. This can open regular
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355 files as well as stdin/stdout if ``'-'`` is passed.
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356
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357 If stdin/stdout is returned the stream is wrapped so that the context
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358 manager will not close the stream accidentally. This makes it possible
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359 to always use the function like this without having to worry to
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360 accidentally close a standard stream::
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361
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362 with open_file(filename) as f:
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363 ...
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364
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365 .. versionadded:: 3.0
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366
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367 :param filename: the name of the file to open (or ``'-'`` for stdin/stdout).
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368 :param mode: the mode in which to open the file.
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369 :param encoding: the encoding to use.
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370 :param errors: the error handling for this file.
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371 :param lazy: can be flipped to true to open the file lazily.
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372 :param atomic: in atomic mode writes go into a temporary file and it's
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373 moved on close.
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374 """
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375 if lazy:
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376 return LazyFile(filename, mode, encoding, errors, atomic=atomic)
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377 f, should_close = open_stream(filename, mode, encoding, errors,
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378 atomic=atomic)
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379 if not should_close:
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380 f = KeepOpenFile(f)
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381 return f
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382
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383
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384 def format_filename(filename, shorten=False):
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385 """Formats a filename for user display. The main purpose of this
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386 function is to ensure that the filename can be displayed at all. This
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387 will decode the filename to unicode if necessary in a way that it will
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388 not fail. Optionally, it can shorten the filename to not include the
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389 full path to the filename.
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390
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391 :param filename: formats a filename for UI display. This will also convert
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392 the filename into unicode without failing.
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393 :param shorten: this optionally shortens the filename to strip of the
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394 path that leads up to it.
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395 """
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396 if shorten:
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397 filename = os.path.basename(filename)
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398 return filename_to_ui(filename)
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399
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400
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401 def get_app_dir(app_name, roaming=True, force_posix=False):
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402 r"""Returns the config folder for the application. The default behavior
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403 is to return whatever is most appropriate for the operating system.
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404
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405 To give you an idea, for an app called ``"Foo Bar"``, something like
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406 the following folders could be returned:
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407
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408 Mac OS X:
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409 ``~/Library/Application Support/Foo Bar``
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410 Mac OS X (POSIX):
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411 ``~/.foo-bar``
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412 Unix:
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413 ``~/.config/foo-bar``
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414 Unix (POSIX):
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415 ``~/.foo-bar``
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416 Win XP (roaming):
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417 ``C:\Documents and Settings\<user>\Local Settings\Application Data\Foo Bar``
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418 Win XP (not roaming):
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419 ``C:\Documents and Settings\<user>\Application Data\Foo Bar``
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420 Win 7 (roaming):
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421 ``C:\Users\<user>\AppData\Roaming\Foo Bar``
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422 Win 7 (not roaming):
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423 ``C:\Users\<user>\AppData\Local\Foo Bar``
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424
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425 .. versionadded:: 2.0
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426
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427 :param app_name: the application name. This should be properly capitalized
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428 and can contain whitespace.
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429 :param roaming: controls if the folder should be roaming or not on Windows.
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430 Has no affect otherwise.
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431 :param force_posix: if this is set to `True` then on any POSIX system the
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432 folder will be stored in the home folder with a leading
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433 dot instead of the XDG config home or darwin's
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434 application support folder.
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435 """
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436 if WIN:
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437 key = roaming and 'APPDATA' or 'LOCALAPPDATA'
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438 folder = os.environ.get(key)
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439 if folder is None:
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440 folder = os.path.expanduser('~')
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441 return os.path.join(folder, app_name)
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442 if force_posix:
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443 return os.path.join(os.path.expanduser('~/.' + _posixify(app_name)))
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444 if sys.platform == 'darwin':
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445 return os.path.join(os.path.expanduser(
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446 '~/Library/Application Support'), app_name)
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447 return os.path.join(
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448 os.environ.get('XDG_CONFIG_HOME', os.path.expanduser('~/.config')),
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449 _posixify(app_name))