Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/pathutils.py @ 4:79f47841a781 draft

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:47:39 -0400
parents 26e78fe6e8c4
children
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1 """
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2 Functions for working with filesystem paths.
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3
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4 The :func:`expandpath` function expands the tilde to $HOME and environment
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5 variables to their values.
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6
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7 The :func:`augpath` function creates variants of an existing path without
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8 having to spend multiple lines of code splitting it up and stitching it back
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9 together.
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10
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11 The :func:`shrinkuser` function replaces your home directory with a tilde.
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12 """
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13 from __future__ import print_function
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14
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15 from os.path import (expanduser, expandvars, join, normpath, split, splitext)
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16 import os
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17
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18
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19 __all__ = [
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20 'augpath', 'shrinkuser', 'expandpath',
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21 ]
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22
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23
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24 def augpath(path, suffix='', prefix='', ext=None, base=None, dpath=None,
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25 multidot=False):
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26 """
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27 Augment a path by modifying its components.
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28
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29 Creates a new path with a different extension, basename, directory, prefix,
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30 and/or suffix.
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31
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32 A prefix is inserted before the basename. A suffix is inserted
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33 between the basename and the extension. The basename and extension can be
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34 replaced with a new one. Essentially a path is broken down into components
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35 (dpath, base, ext), and then recombined as (dpath, prefix, base, suffix,
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36 ext) after replacing any specified component.
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37
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38 Args:
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39 path (str | PathLike): a path to augment
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40 suffix (str, default=''): placed between the basename and extension
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41 prefix (str, default=''): placed in front of the basename
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42 ext (str, default=None): if specified, replaces the extension
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43 base (str, default=None): if specified, replaces the basename without
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44 extension
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45 dpath (str | PathLike, default=None): if specified, replaces the
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46 directory
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47 multidot (bool, default=False): Allows extensions to contain multiple
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48 dots. Specifically, if False, everything after the last dot in the
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49 basename is the extension. If True, everything after the first dot
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50 in the basename is the extension.
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51
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52 Returns:
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53 str: augmented path
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54
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55 Example:
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56 >>> path = 'foo.bar'
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57 >>> suffix = '_suff'
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58 >>> prefix = 'pref_'
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59 >>> ext = '.baz'
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60 >>> newpath = augpath(path, suffix, prefix, ext=ext, base='bar')
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61 >>> print('newpath = %s' % (newpath,))
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62 newpath = pref_bar_suff.baz
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63
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64 Example:
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65 >>> augpath('foo.bar')
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66 'foo.bar'
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67 >>> augpath('foo.bar', ext='.BAZ')
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68 'foo.BAZ'
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69 >>> augpath('foo.bar', suffix='_')
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70 'foo_.bar'
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71 >>> augpath('foo.bar', prefix='_')
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72 '_foo.bar'
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73 >>> augpath('foo.bar', base='baz')
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74 'baz.bar'
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75 >>> augpath('foo.tar.gz', ext='.zip', multidot=True)
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76 'foo.zip'
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77 >>> augpath('foo.tar.gz', ext='.zip', multidot=False)
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78 'foo.tar.zip'
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79 >>> augpath('foo.tar.gz', suffix='_new', multidot=True)
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80 'foo_new.tar.gz'
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81 """
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82 # Breakup path
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83 orig_dpath, fname = split(path)
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84 if multidot:
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85 # The first dot defines the extension
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86 parts = fname.split('.', 1)
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87 orig_base = parts[0]
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88 orig_ext = '' if len(parts) == 1 else '.' + parts[1]
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89 else:
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90 # The last dot defines the extension
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91 orig_base, orig_ext = splitext(fname)
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92 # Replace parts with specified augmentations
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93 if dpath is None:
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94 dpath = orig_dpath
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95 if ext is None:
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96 ext = orig_ext
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97 if base is None:
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98 base = orig_base
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99 # Recombine into new path
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100 new_fname = ''.join((prefix, base, suffix, ext))
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101 newpath = join(dpath, new_fname)
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102 return newpath
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103
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104
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105 def shrinkuser(path, home='~'):
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106 """
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107 Inverse of :func:`os.path.expanduser`.
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108
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109 Args:
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110 path (str | PathLike): path in system file structure
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111 home (str, default='~'): symbol used to replace the home path.
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112 Defaults to '~', but you might want to use '$HOME' or
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113 '%USERPROFILE%' instead.
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114
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115 Returns:
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116 str: path: shortened path replacing the home directory with a tilde
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117
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118 Example:
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119 >>> path = expanduser('~')
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120 >>> assert path != '~'
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121 >>> assert shrinkuser(path) == '~'
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122 >>> assert shrinkuser(path + '1') == path + '1'
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123 >>> assert shrinkuser(path + '/1') == join('~', '1')
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124 >>> assert shrinkuser(path + '/1', '$HOME') == join('$HOME', '1')
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125 """
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126 path = normpath(path)
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127 userhome_dpath = expanduser('~')
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128 if path.startswith(userhome_dpath):
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129 if len(path) == len(userhome_dpath):
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130 path = home
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131 elif path[len(userhome_dpath)] == os.path.sep:
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132 path = home + path[len(userhome_dpath):]
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133 return path
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134
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135
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136 def expandpath(path):
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137 """
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138 Shell-like expansion of environment variables and tilde home directory.
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139
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140 Args:
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141 path (str | PathLike): the path to expand
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142
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143 Returns:
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144 str : expanded path
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145
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146 Example:
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147 >>> import os
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148 >>> os.environ['SPAM'] = 'eggs'
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149 >>> assert expandpath('~/$SPAM') == expanduser('~/eggs')
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150 >>> assert expandpath('foo') == 'foo'
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151 """
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152 path = expanduser(path)
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153 path = expandvars(path)
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154 return path