Mercurial > hgrepos > Python > apps > py-cutils

annotate cutils/util/walk.py @ 162:29dd5528174c

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Implement walk._walk() using os.listdir() also. Use it if no scandir is available.
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 09 Jan 2025 13:36:41 +0100
parents 481cc9b26861
children a813094ae4f5
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1 # -*- coding: utf-8 -*-
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2 # :-
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3 # :Copyright: (c) 2020-2025 Franz Glasner
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4 # :License: BSD-3-Clause
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5 # :-
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6 r"""Utility sub-module to implement a heavily customized :func:`os.walk`.
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7
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8 """
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9
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10 __all__ = ["walk"]
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11
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12
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13 import os
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14 try:
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15 from os import scandir
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16 except ImportError:
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17 try:
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18 from scandir import scandir
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19 except ImportError:
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20 scandir = None
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21
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22 from .cm import nullcontext
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23 from .constants import PY2
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24
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25
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26 class WalkDirEntry(object):
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27
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28 """A :class:`os.DirEntry` alike to be used in :func:`walk` and for
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29 its results.
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30
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31 """
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32
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33 __slots__ = ("_name", "_fsname", "_path", "_fspath", "_is_symlink",
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34 "_is_dir", "_stat_result")
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35
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36 def __init__(self, name):
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37 self._name = name
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38 if PY2:
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39 assert isinstance(name, bytes)
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40 self._fsname = name
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41 else:
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42 self._fsname = os.fsencode(name)
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43 self._path = None
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44 self._fspath = None
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45 self._is_symlink = self._is_dir = self._stat_result = None
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46
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47 @property
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48 def name(self):
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49 return self._name
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50
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51 @property
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52 def fsname(self):
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53 return self._fsname
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54
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55 @property
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56 def path(self):
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57 return self._path
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58
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59 @property
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60 def fspath(self):
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61 if self._path is not None:
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62 if self._fspath is None:
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63 if PY2:
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64 assert isinstance(self._path, bytes)
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65 self._fspath = self._path
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66 else:
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67 self._fspath = os.fsencode(self._path)
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68 return self._fspath
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69
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70 @property
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71 def is_symlink(self):
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72 return self._is_symlink
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73
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74 @property
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75 def is_dir(self):
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76 return self._is_dir
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77
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78 @property
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79 def stat(self):
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80 return self._stat_result
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81
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82 def __repr__(self):
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83 tag = ""
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84 if self._is_symlink:
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85 tag += "l"
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86 if self._is_dir:
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87 tag += "d"
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88 if tag:
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89 return "<WalkDirEntry %r (%s)>" % (self._name, tag)
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90 return "<WalkDirEntry %r>" % (self._name,)
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91
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92 @classmethod
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93 def from_direntry(cls_, entry):
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94 w = cls_(entry.name)
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95 w._path = entry.path
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96 try:
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97 w._is_dir = entry.is_dir(follow_symlinks=True)
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98 except OSError:
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99 #
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100 # If is_dir() raises an OSError, consider that the entry
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101 # is not a directory, same behaviour than os.path.isdir().
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102 #
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103 w._is_dir = False
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104 try:
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105 w._is_symlink = entry.is_symlink()
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106 except OSError:
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107 #
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108 # If is_symlink() raises an OSError, consider that the entry
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109 # is not a symbolic link, same behaviour than os.path.islink().
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110 #
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111 w._is_symlink = False
156
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112 # Do not supress errors here and (consistently) follow symlinks
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113 w._stat_result = entry.stat(follow_symlinks=True)
121
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114 return w
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115
162
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116 @classmethod
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117 def from_path_name(cls_, path, name):
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118 w = cls_(name)
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119 w._path = os.path.join(path, name)
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120 try:
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121 w._is_dir = os.path.isdir(w._path)
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122 except OSError:
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parents: 156
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123 #
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124 # If is_dir() raises an OSError, consider that the entry
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diff changeset
125 # is not a directory, same behaviour than os.path.isdir().
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parents: 156
diff changeset
126 #
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127 w._is_dir = False
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diff changeset
128 try:
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diff changeset
129 w._is_symlink = os.path.islink(w._path)
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parents: 156
diff changeset
130 except OSError:
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parents: 156
diff changeset
131 #
29dd5528174c Implement walk._walk() using os.listdir() also.
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diff changeset
132 # If is_symlink() raises an OSError, consider that the entry
29dd5528174c Implement walk._walk() using os.listdir() also.
Franz Glasner <fzglas.hg@dom66.de>
parents: 156
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133 # is not a symbolic link, same behaviour than os.path.islink().
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parents: 156
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134 #
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Franz Glasner <fzglas.hg@dom66.de>
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135 w._is_symlink = False
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diff changeset
136 w._stat_result = os.stat(w._path)
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137 return w
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
138
121
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
Franz Glasner <fzglas.hg@dom66.de>
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139 @staticmethod
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140 def sort_key(entry):
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141 return entry._fsname
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142
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parents:
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143
162
29dd5528174c Implement walk._walk() using os.listdir() also.
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144 def walk(root, follow_symlinks=False):
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145 """A heyvily customized :func:`os.walk` alike that differs from the
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
146 original:
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Franz Glasner <fzglas.hg@dom66.de>
parents: 156
diff changeset
147
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148 - optimized for use in :command:`treesum`
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149 - most errors are not suppressed
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150 - the `root` is never part of the returned data
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151 - the returned directory in "top" is not a string form but a list of
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diff changeset
152 individual path segments
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153 - there is only one yielded list
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Franz Glasner <fzglas.hg@dom66.de>
parents: 156
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154
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Franz Glasner <fzglas.hg@dom66.de>
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155 * contains :class:`WalkDirEntry`
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Franz Glasner <fzglas.hg@dom66.de>
parents: 156
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156 * sorted by its fsname
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Franz Glasner <fzglas.hg@dom66.de>
parents: 156
diff changeset
157
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diff changeset
158 The caller can easily get the old dirs and nondirs by filtering
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diff changeset
159 the yielded list using "entry.is_dir".
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parents: 156
diff changeset
160
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diff changeset
161 - recurse into sub-directories first ("topdown=False")
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162 - sort consistently all yielded lists by the filesystem encoding
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parents: 156
diff changeset
163
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164 .. note:: The implementation is based on Python 3.11 and needs a
29dd5528174c Implement walk._walk() using os.listdir() also.
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diff changeset
165 functional :func:`os.scandir` or :func:`scandir.scandir`
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diff changeset
166 implementation. It intentionally follows the logic in
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diff changeset
167 Python 3.11 while it could be simplified because we are not
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diff changeset
168 implementing some of the original flags (e.g. like
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diff changeset
169 `topdown`).
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diff changeset
170
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171 """
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diff changeset
172 normed_root = os.path.normpath(root)
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diff changeset
173 yield from _walk(normed_root, tuple(), follow_symlinks=follow_symlinks)
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diff changeset
174
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parents: 156
diff changeset
175
121
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
176 if scandir:
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177
162
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diff changeset
178 def _walk(root, top, follow_symlinks):
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diff changeset
179 """:func:`walk` helper.
154
c7df81fb84b7 Merge dirs and nondirs into one list that is yielded from "util.walk()"
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parents: 123
diff changeset
180
162
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diff changeset
181 Implemented using :func:`os.scandir`.
121
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
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182
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parents:
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183 """
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
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184 if top:
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185 path = os.path.join(root, *top)
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186 else:
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187 path = root
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188
154
c7df81fb84b7 Merge dirs and nondirs into one list that is yielded from "util.walk()"
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parents: 123
diff changeset
189 fsobjects, walk_dirs = [], []
121
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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190
123
4a0c3c9eead7 Use the output of "scandir()" directly if it has a "close" method.
Franz Glasner <fzglas.hg@dom66.de>
parents: 121
diff changeset
191 scandir_cm = scandir(path)
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parents: 121
diff changeset
192 if not hasattr(scandir_cm, "close"):
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parents: 121
diff changeset
193 scandir_cm = nullcontext(scandir_cm)
4a0c3c9eead7 Use the output of "scandir()" directly if it has a "close" method.
Franz Glasner <fzglas.hg@dom66.de>
parents: 121
diff changeset
194 with scandir_cm as scandir_it:
121
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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195 while True:
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
Franz Glasner <fzglas.hg@dom66.de>
parents:
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196 try:
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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197 entry = WalkDirEntry.from_direntry(next(scandir_it))
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198 except StopIteration:
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199 break
154
c7df81fb84b7 Merge dirs and nondirs into one list that is yielded from "util.walk()"
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diff changeset
200 fsobjects.append(entry)
121
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201 #
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202 # Always bottom-up: recurse into sub-directories, but exclude
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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203 # symlinks to directories if follow_symlinks is False
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parents:
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204 #
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Franz Glasner <fzglas.hg@dom66.de>
parents:
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205 if entry.is_dir:
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
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206 if follow_symlinks:
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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207 walk_into = True
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208 else:
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parents:
diff changeset
209 walk_into = not entry.is_symlink
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
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210 if walk_into:
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parents:
diff changeset
211 walk_dirs.append(entry)
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parents:
diff changeset
212
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
diff changeset
213 # Sort by low-level filesystem encoding
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
diff changeset
214 walk_dirs.sort(key=WalkDirEntry.sort_key)
154
c7df81fb84b7 Merge dirs and nondirs into one list that is yielded from "util.walk()"
Franz Glasner <fzglas.hg@dom66.de>
parents: 123
diff changeset
215 fsobjects.sort(key=WalkDirEntry.sort_key)
121
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parents:
diff changeset
216
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
217 # Recurse into sub-directories
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Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
218 for wd in walk_dirs:
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
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parents:
diff changeset
219 yield from _walk(root, top + (wd.name,), follow_symlinks)
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parents:
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220 # Yield after recursion if going bottom up
154
c7df81fb84b7 Merge dirs and nondirs into one list that is yielded from "util.walk()"
Franz Glasner <fzglas.hg@dom66.de>
parents: 123
diff changeset
221 yield top, fsobjects
121
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parents:
diff changeset
222
2dc26a2f3d1c A heavily customized "os.walk()" alike to support the coming treeview implementation
Franz Glasner <fzglas.hg@dom66.de>
parents:
diff changeset
223 else:
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parents:
diff changeset
224
162
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parents: 156
diff changeset
225 def _walk(root, top, follow_symlinks):
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parents: 156
diff changeset
226 """:func:`walk` helper.
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parents: 156
diff changeset
227
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diff changeset
228 Implemented using :func:`os.listdir`.
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parents: 156
diff changeset
229
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diff changeset
230 """
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231 if top:
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diff changeset
232 path = os.path.join(root, *top)
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parents: 156
diff changeset
233 else:
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parents: 156
diff changeset
234 path = root
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diff changeset
235
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diff changeset
236 fsobjects, walk_dirs = [], []
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parents: 156
diff changeset
237
29dd5528174c Implement walk._walk() using os.listdir() also.
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parents: 156
diff changeset
238 names = os.listdir(path)
29dd5528174c Implement walk._walk() using os.listdir() also.
Franz Glasner <fzglas.hg@dom66.de>
parents: 156
diff changeset
239 for name in names:
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diff changeset
240 entry = WalkDirEntry.from_path_name(path, name)
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parents: 156
diff changeset
241 fsobjects.append(entry)
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parents: 156
diff changeset
242 #
29dd5528174c Implement walk._walk() using os.listdir() also.
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parents: 156
diff changeset
243 # Always bottom-up: recurse into sub-directories, but exclude
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parents: 156
diff changeset
244 # symlinks to directories if follow_symlinks is False
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parents: 156
diff changeset
245 #
29dd5528174c Implement walk._walk() using os.listdir() also.
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parents: 156
diff changeset
246 if entry.is_dir:
29dd5528174c Implement walk._walk() using os.listdir() also.
Franz Glasner <fzglas.hg@dom66.de>
parents: 156
diff changeset
247 if follow_symlinks:
29dd5528174c Implement walk._walk() using os.listdir() also.
Franz Glasner <fzglas.hg@dom66.de>
parents: 156
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248 walk_into = True
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249 else:
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250 walk_into = not entry.is_symlink
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251 if walk_into:
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252 walk_dirs.append(entry)
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253
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254 # Sort by low-level filesystem encoding
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255 walk_dirs.sort(key=WalkDirEntry.sort_key)
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256 fsobjects.sort(key=WalkDirEntry.sort_key)
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257
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258 # Recurse into sub-directories
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259 for wd in walk_dirs:
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260 yield from _walk(root, top + (wd.name,), follow_symlinks)
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261 # Yield after recursion if going bottom up
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262 yield top, fsobjects