annotate python/tree.py @ 575:5f186e65da09

STUB: python/lsexts.py
author Jeff Hammel <k0scist@gmail.com>
date Fri, 17 Jan 2014 15:01:44 -0800
parents fbb5b143349a
children 93dc0507ab3b
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1 #!/usr/bin/env python
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2 # -*- coding: utf-8 -*-
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3
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4 """
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5 tree in python
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6 """
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7
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8 # TODO: script2package
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9
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10 import optparse
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11 import os
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12 import sys
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13
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14 # ASCII delimeters
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15 ascii_delimeters = {
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16 'vertical_line' : '|',
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17 'item_marker' : '+',
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18 'last_child' : '\\'
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19 }
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20
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21 # unicode delimiters
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22 unicode_delimeters = {
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23 'vertical_line' : '│',
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24 'item_marker' : '├',
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25 'last_child' : '└'
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26 }
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28
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29 def depth(directory):
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30 """returns the integer depth of a directory or path relative to '/' """
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31
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32 directory = os.path.abspath(directory)
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33 level = 0
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34 while True:
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35 directory, remainder = os.path.split(directory)
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36 level += 1
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37 if not remainder:
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38 break
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39 return level
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41
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42 ### stuff for tree generalization
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43
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44 class Tree(object):
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45 """tree structure in python"""
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46
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47 def __init__(self, parent=None):
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48 self.parent = parent
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49 self._children = []
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50
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51 def children(self):
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52 """returns children of the tree"""
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53 return self._children # base implementation
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54
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55 def add(self, item):
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56 """add a child to the tree root"""
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57
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58 def update(self, tree):
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59 """add a subtree to the tree"""
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60 self.add(tree)
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61 tree.parent = self # XXX .add should probably do this for scary reasons
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62
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63 def output(self, serializer):
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64 """output the tree via the given serializer"""
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65 # XXX or should this method exist at all and instead the
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66 # __call__ method of serializers take a Tree object?
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67
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68 class DirectoryTree(Tree):
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69 """directory structure as a tree"""
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70
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71 def __init__(self, directory):
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72 self.directory = directory
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73 self._return_type = os.path.abspath
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75 def children(self):
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76 return os.listdir(self.directory) # -> self._return_type
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77
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78 ## Serializers
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79
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80 def tree2html(tree):
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81 """
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82 .
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83 ├── a8e.py
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84 ├── abstract.py
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85 ├── accentuate.py
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86
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87 ->
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88
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89 <ul>
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90 <li>a8e.py</li>
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91 ...
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92 """
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93
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94
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95 # How to serialize a tree -> JSON?
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96
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97 ###
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98
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99 def tree(directory,
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100 item_marker=unicode_delimeters['item_marker'],
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101 vertical_line=unicode_delimeters['vertical_line'],
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102 last_child=unicode_delimeters['last_child'],
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103 sort_key=lambda x: x.lower()):
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104 """
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105 display tree directory structure for `directory`
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106 """
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107
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108 retval = []
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109 indent = []
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110 last = {}
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111 top = depth(directory)
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112
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113 for dirpath, dirnames, filenames in os.walk(directory, topdown=True):
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114
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115 abspath = os.path.abspath(dirpath)
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116 basename = os.path.basename(abspath)
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117 parent = os.path.dirname(abspath)
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118 level = depth(abspath) - top
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119
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120 # sort articles of interest
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121 for resource in (dirnames, filenames):
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122 resource[:] = sorted(resource, key=sort_key)
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123
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124 files_end = item_marker
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125 dirpath_marker = item_marker
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126
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127 if level > len(indent):
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128 indent.append(vertical_line)
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129 indent = indent[:level]
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130
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131 if dirnames:
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132 files_end = item_marker
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133 last[abspath] = dirnames[-1]
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134 else:
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135 files_end = last_child
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136
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137 if last.get(parent) == os.path.basename(abspath):
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138 # last directory of parent
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139 dirpath_mark = last_child
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140 indent[-1] = ' '
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141 elif not indent:
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142 dirpath_mark = ''
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143 else:
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144 dirpath_mark = item_marker
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145
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146 # append the directory and piece of tree structure
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147 # if the top-level entry directory, print as passed
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148 retval.append('%s%s%s'% (''.join(indent[:-1]),
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149 dirpath_mark,
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150 basename if retval else directory))
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151 # add the files
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152 if filenames:
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153 last_file = filenames[-1]
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154 retval.extend([('%s%s%s' % (''.join(indent),
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155 files_end if filename == last_file else item_marker,
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156 filename))
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157 for index, filename in enumerate(filenames)])
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158
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159 return '\n'.join(retval)
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160
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161 def main(args=sys.argv[1:]):
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162
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163 # parse command line options
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164 usage = '%prog [options]'
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165 parser = optparse.OptionParser(usage=usage, description=__doc__)
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166 parser.add_option('-a', '--ascii', dest='use_ascii',
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167 action='store_true', default=False,
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168 help="use ascii delimeters (%s)" % ascii_delimeters)
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169 options, args = parser.parse_args(args)
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170 if not args:
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171 args = ['.']
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172
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173 # sanity check
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174 not_directory = [arg for arg in args
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175 if not os.path.isdir(arg)]
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176 if not_directory:
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177 parser.error("Not a directory: %s" % (', '.join(not_directory)))
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178
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179 delimeters = unicode_delimeters
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180 if options.use_ascii:
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181 delimeters = ascii_delimeters
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182
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183 # print the tree
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184 for arg in args:
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185 print (tree(arg, **delimeters))
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186
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187 if __name__ == '__main__':
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188 main()