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annotate Lib/filecmp.py @ 70817:dd775b1561ba

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author Georg Brandl <georg@python.org>
date Tue, 14 Jun 2011 21:09:55 +0200
parents 287887198e2f
children 2bacaf6a80c4
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1 """Utilities for comparing files and directories.
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2
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3 Classes:
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4 dircmp
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5
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6 Functions:
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7 cmp(f1, f2, shallow=True) -> int
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8 cmpfiles(a, b, common) -> ([], [], [])
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9
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10 """
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11
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12 import os
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13 import stat
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14 from itertools import filterfalse
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15
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16 __all__ = ["cmp", "dircmp", "cmpfiles"]
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17
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18 _cache = {}
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19 BUFSIZE = 8*1024
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21 def cmp(f1, f2, shallow=True):
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22 """Compare two files.
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23
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24 Arguments:
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25
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26 f1 -- First file name
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28 f2 -- Second file name
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29
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30 shallow -- Just check stat signature (do not read the files).
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31 defaults to 1.
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32
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33 Return value:
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34
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35 True if the files are the same, False otherwise.
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36
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37 This function uses a cache for past comparisons and the results,
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38 with a cache invalidation mechanism relying on stale signatures.
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39
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40 """
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41
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42 s1 = _sig(os.stat(f1))
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43 s2 = _sig(os.stat(f2))
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44 if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:
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45 return False
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46 if shallow and s1 == s2:
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47 return True
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48 if s1[1] != s2[1]:
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49 return False
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50
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51 result = _cache.get((f1, f2))
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52 if result and (s1, s2) == result[:2]:
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53 return result[2]
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54 outcome = _do_cmp(f1, f2)
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55 _cache[f1, f2] = s1, s2, outcome
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56 return outcome
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57
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58 def _sig(st):
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59 return (stat.S_IFMT(st.st_mode),
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60 st.st_size,
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61 st.st_mtime)
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62
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63 def _do_cmp(f1, f2):
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64 bufsize = BUFSIZE
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65 with open(f1, 'rb') as fp1, open(f2, 'rb') as fp2:
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66 while True:
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67 b1 = fp1.read(bufsize)
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68 b2 = fp2.read(bufsize)
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69 if b1 != b2:
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70 return False
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71 if not b1:
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72 return True
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73
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74 # Directory comparison class.
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75 #
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76 class dircmp:
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77 """A class that manages the comparison of 2 directories.
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78
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79 dircmp(a, b, ignore=None, hide=None)
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80 A and B are directories.
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81 IGNORE is a list of names to ignore,
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82 defaults to ['RCS', 'CVS', 'tags'].
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83 HIDE is a list of names to hide,
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84 defaults to [os.curdir, os.pardir].
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85
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86 High level usage:
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87 x = dircmp(dir1, dir2)
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88 x.report() -> prints a report on the differences between dir1 and dir2
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89 or
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90 x.report_partial_closure() -> prints report on differences between dir1
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91 and dir2, and reports on common immediate subdirectories.
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92 x.report_full_closure() -> like report_partial_closure,
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93 but fully recursive.
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94
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95 Attributes:
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96 left_list, right_list: The files in dir1 and dir2,
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97 filtered by hide and ignore.
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98 common: a list of names in both dir1 and dir2.
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99 left_only, right_only: names only in dir1, dir2.
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100 common_dirs: subdirectories in both dir1 and dir2.
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101 common_files: files in both dir1 and dir2.
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102 common_funny: names in both dir1 and dir2 where the type differs between
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103 dir1 and dir2, or the name is not stat-able.
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104 same_files: list of identical files.
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105 diff_files: list of filenames which differ.
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106 funny_files: list of files which could not be compared.
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107 subdirs: a dictionary of dircmp objects, keyed by names in common_dirs.
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108 """
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109
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110 def __init__(self, a, b, ignore=None, hide=None): # Initialize
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111 self.left = a
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112 self.right = b
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113 if hide is None:
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114 self.hide = [os.curdir, os.pardir] # Names never to be shown
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115 else:
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116 self.hide = hide
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117 if ignore is None:
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118 self.ignore = ['RCS', 'CVS', 'tags'] # Names ignored in comparison
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119 else:
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120 self.ignore = ignore
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121
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122 def phase0(self): # Compare everything except common subdirectories
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123 self.left_list = _filter(os.listdir(self.left),
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124 self.hide+self.ignore)
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125 self.right_list = _filter(os.listdir(self.right),
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126 self.hide+self.ignore)
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127 self.left_list.sort()
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128 self.right_list.sort()
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129
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130 def phase1(self): # Compute common names
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131 a = dict(zip(map(os.path.normcase, self.left_list), self.left_list))
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132 b = dict(zip(map(os.path.normcase, self.right_list), self.right_list))
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133 self.common = list(map(a.__getitem__, filter(b.__contains__, a)))
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134 self.left_only = list(map(a.__getitem__, filterfalse(b.__contains__, a)))
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135 self.right_only = list(map(b.__getitem__, filterfalse(a.__contains__, b)))
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136
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137 def phase2(self): # Distinguish files, directories, funnies
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138 self.common_dirs = []
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139 self.common_files = []
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140 self.common_funny = []
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141
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142 for x in self.common:
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143 a_path = os.path.join(self.left, x)
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144 b_path = os.path.join(self.right, x)
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145
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146 ok = 1
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147 try:
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148 a_stat = os.stat(a_path)
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149 except os.error as why:
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150 # print('Can\'t stat', a_path, ':', why.args[1])
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151 ok = 0
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152 try:
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153 b_stat = os.stat(b_path)
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154 except os.error as why:
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155 # print('Can\'t stat', b_path, ':', why.args[1])
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156 ok = 0
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157
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158 if ok:
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159 a_type = stat.S_IFMT(a_stat.st_mode)
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160 b_type = stat.S_IFMT(b_stat.st_mode)
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161 if a_type != b_type:
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162 self.common_funny.append(x)
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163 elif stat.S_ISDIR(a_type):
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164 self.common_dirs.append(x)
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165 elif stat.S_ISREG(a_type):
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166 self.common_files.append(x)
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167 else:
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168 self.common_funny.append(x)
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169 else:
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170 self.common_funny.append(x)
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171
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172 def phase3(self): # Find out differences between common files
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173 xx = cmpfiles(self.left, self.right, self.common_files)
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174 self.same_files, self.diff_files, self.funny_files = xx
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175
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176 def phase4(self): # Find out differences between common subdirectories
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177 # A new dircmp object is created for each common subdirectory,
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178 # these are stored in a dictionary indexed by filename.
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179 # The hide and ignore properties are inherited from the parent
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180 self.subdirs = {}
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181 for x in self.common_dirs:
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182 a_x = os.path.join(self.left, x)
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183 b_x = os.path.join(self.right, x)
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184 self.subdirs[x] = dircmp(a_x, b_x, self.ignore, self.hide)
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185
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186 def phase4_closure(self): # Recursively call phase4() on subdirectories
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187 self.phase4()
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188 for sd in self.subdirs.values():
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189 sd.phase4_closure()
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190
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191 def report(self): # Print a report on the differences between a and b
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192 # Output format is purposely lousy
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193 print('diff', self.left, self.right)
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194 if self.left_only:
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195 self.left_only.sort()
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196 print('Only in', self.left, ':', self.left_only)
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197 if self.right_only:
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198 self.right_only.sort()
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199 print('Only in', self.right, ':', self.right_only)
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200 if self.same_files:
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201 self.same_files.sort()
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202 print('Identical files :', self.same_files)
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203 if self.diff_files:
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204 self.diff_files.sort()
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205 print('Differing files :', self.diff_files)
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206 if self.funny_files:
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207 self.funny_files.sort()
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208 print('Trouble with common files :', self.funny_files)
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209 if self.common_dirs:
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210 self.common_dirs.sort()
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211 print('Common subdirectories :', self.common_dirs)
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212 if self.common_funny:
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213 self.common_funny.sort()
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214 print('Common funny cases :', self.common_funny)
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215
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216 def report_partial_closure(self): # Print reports on self and on subdirs
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217 self.report()
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218 for sd in self.subdirs.values():
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219 print()
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220 sd.report()
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221
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222 def report_full_closure(self): # Report on self and subdirs recursively
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223 self.report()
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224 for sd in self.subdirs.values():
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225 print()
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226 sd.report_full_closure()
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227
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228 methodmap = dict(subdirs=phase4,
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229 same_files=phase3, diff_files=phase3, funny_files=phase3,
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230 common_dirs = phase2, common_files=phase2, common_funny=phase2,
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231 common=phase1, left_only=phase1, right_only=phase1,
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232 left_list=phase0, right_list=phase0)
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233
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234 def __getattr__(self, attr):
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235 if attr not in self.methodmap:
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236 raise AttributeError(attr)
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237 self.methodmap[attr](self)
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238 return getattr(self, attr)
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239
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240 def cmpfiles(a, b, common, shallow=True):
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241 """Compare common files in two directories.
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242
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243 a, b -- directory names
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244 common -- list of file names found in both directories
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245 shallow -- if true, do comparison based solely on stat() information
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246
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247 Returns a tuple of three lists:
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248 files that compare equal
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249 files that are different
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250 filenames that aren't regular files.
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251
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252 """
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253 res = ([], [], [])
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254 for x in common:
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255 ax = os.path.join(a, x)
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256 bx = os.path.join(b, x)
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257 res[_cmp(ax, bx, shallow)].append(x)
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258 return res
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259
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260
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261 # Compare two files.
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262 # Return:
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263 # 0 for equal
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264 # 1 for different
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265 # 2 for funny cases (can't stat, etc.)
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266 #
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267 def _cmp(a, b, sh, abs=abs, cmp=cmp):
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268 try:
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269 return not abs(cmp(a, b, sh))
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270 except os.error:
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271 return 2
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272
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273
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274 # Return a copy with items that occur in skip removed.
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275 #
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276 def _filter(flist, skip):
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277 return list(filterfalse(skip.__contains__, flist))
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278
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279
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280 # Demonstration and testing.
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281 #
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282 def demo():
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283 import sys
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284 import getopt
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285 options, args = getopt.getopt(sys.argv[1:], 'r')
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286 if len(args) != 2:
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287 raise getopt.GetoptError('need exactly two args', None)
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288 dd = dircmp(args[0], args[1])
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289 if ('-r', '') in options:
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290 dd.report_full_closure()
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291 else:
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292 dd.report()
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293
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294 if __name__ == '__main__':
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295 demo()