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comparison env/lib/python3.7/site-packages/boltons/pathutils.py @ 5:9b1c78e6ba9c draft default tip

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"planemo upload commit 6c0a8142489327ece472c84e558c47da711a9142"
author shellac
date Mon, 01 Jun 2020 08:59:25 -0400
parents 79f47841a781
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4:79f47841a781 5:9b1c78e6ba9c
1 """
2 Functions for working with filesystem paths.
3
4 The :func:`expandpath` function expands the tilde to $HOME and environment
5 variables to their values.
6
7 The :func:`augpath` function creates variants of an existing path without
8 having to spend multiple lines of code splitting it up and stitching it back
9 together.
10
11 The :func:`shrinkuser` function replaces your home directory with a tilde.
12 """
13 from __future__ import print_function
14
15 from os.path import (expanduser, expandvars, join, normpath, split, splitext)
16 import os
17
18
19 __all__ = [
20 'augpath', 'shrinkuser', 'expandpath',
21 ]
22
23
24 def augpath(path, suffix='', prefix='', ext=None, base=None, dpath=None,
25 multidot=False):
26 """
27 Augment a path by modifying its components.
28
29 Creates a new path with a different extension, basename, directory, prefix,
30 and/or suffix.
31
32 A prefix is inserted before the basename. A suffix is inserted
33 between the basename and the extension. The basename and extension can be
34 replaced with a new one. Essentially a path is broken down into components
35 (dpath, base, ext), and then recombined as (dpath, prefix, base, suffix,
36 ext) after replacing any specified component.
37
38 Args:
39 path (str | PathLike): a path to augment
40 suffix (str, default=''): placed between the basename and extension
41 prefix (str, default=''): placed in front of the basename
42 ext (str, default=None): if specified, replaces the extension
43 base (str, default=None): if specified, replaces the basename without
44 extension
45 dpath (str | PathLike, default=None): if specified, replaces the
46 directory
47 multidot (bool, default=False): Allows extensions to contain multiple
48 dots. Specifically, if False, everything after the last dot in the
49 basename is the extension. If True, everything after the first dot
50 in the basename is the extension.
51
52 Returns:
53 str: augmented path
54
55 Example:
56 >>> path = 'foo.bar'
57 >>> suffix = '_suff'
58 >>> prefix = 'pref_'
59 >>> ext = '.baz'
60 >>> newpath = augpath(path, suffix, prefix, ext=ext, base='bar')
61 >>> print('newpath = %s' % (newpath,))
62 newpath = pref_bar_suff.baz
63
64 Example:
65 >>> augpath('foo.bar')
66 'foo.bar'
67 >>> augpath('foo.bar', ext='.BAZ')
68 'foo.BAZ'
69 >>> augpath('foo.bar', suffix='_')
70 'foo_.bar'
71 >>> augpath('foo.bar', prefix='_')
72 '_foo.bar'
73 >>> augpath('foo.bar', base='baz')
74 'baz.bar'
75 >>> augpath('foo.tar.gz', ext='.zip', multidot=True)
76 'foo.zip'
77 >>> augpath('foo.tar.gz', ext='.zip', multidot=False)
78 'foo.tar.zip'
79 >>> augpath('foo.tar.gz', suffix='_new', multidot=True)
80 'foo_new.tar.gz'
81 """
82 # Breakup path
83 orig_dpath, fname = split(path)
84 if multidot:
85 # The first dot defines the extension
86 parts = fname.split('.', 1)
87 orig_base = parts[0]
88 orig_ext = '' if len(parts) == 1 else '.' + parts[1]
89 else:
90 # The last dot defines the extension
91 orig_base, orig_ext = splitext(fname)
92 # Replace parts with specified augmentations
93 if dpath is None:
94 dpath = orig_dpath
95 if ext is None:
96 ext = orig_ext
97 if base is None:
98 base = orig_base
99 # Recombine into new path
100 new_fname = ''.join((prefix, base, suffix, ext))
101 newpath = join(dpath, new_fname)
102 return newpath
103
104
105 def shrinkuser(path, home='~'):
106 """
107 Inverse of :func:`os.path.expanduser`.
108
109 Args:
110 path (str | PathLike): path in system file structure
111 home (str, default='~'): symbol used to replace the home path.
112 Defaults to '~', but you might want to use '$HOME' or
113 '%USERPROFILE%' instead.
114
115 Returns:
116 str: path: shortened path replacing the home directory with a tilde
117
118 Example:
119 >>> path = expanduser('~')
120 >>> assert path != '~'
121 >>> assert shrinkuser(path) == '~'
122 >>> assert shrinkuser(path + '1') == path + '1'
123 >>> assert shrinkuser(path + '/1') == join('~', '1')
124 >>> assert shrinkuser(path + '/1', '$HOME') == join('$HOME', '1')
125 """
126 path = normpath(path)
127 userhome_dpath = expanduser('~')
128 if path.startswith(userhome_dpath):
129 if len(path) == len(userhome_dpath):
130 path = home
131 elif path[len(userhome_dpath)] == os.path.sep:
132 path = home + path[len(userhome_dpath):]
133 return path
134
135
136 def expandpath(path):
137 """
138 Shell-like expansion of environment variables and tilde home directory.
139
140 Args:
141 path (str | PathLike): the path to expand
142
143 Returns:
144 str : expanded path
145
146 Example:
147 >>> import os
148 >>> os.environ['SPAM'] = 'eggs'
149 >>> assert expandpath('~/$SPAM') == expanduser('~/eggs')
150 >>> assert expandpath('foo') == 'foo'
151 """
152 path = expanduser(path)
153 path = expandvars(path)
154 return path