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for comparing files and directories.","","Classes:"," dircmp","","Functions:"," cmp(f1, f2, shallow=True) -\u003e int"," cmpfiles(a, b, common) -\u003e ([], [], [])"," clear_cache()","","\"\"\"","","import os","import stat","from itertools import filterfalse","from types import GenericAlias","","__all__ = ['clear_cache', 'cmp', 'dircmp', 'cmpfiles', 'DEFAULT_IGNORES']","","_cache = {}","BUFSIZE = 8*1024","","DEFAULT_IGNORES = ["," 'RCS', 'CVS', 'tags', '.git', '.hg', '.bzr', '_darcs', '__pycache__']","","def clear_cache():"," \"\"\"Clear the filecmp cache.\"\"\""," _cache.clear()","","def cmp(f1, f2, shallow=True):"," \"\"\"Compare two files.",""," Arguments:",""," f1 -- First file name",""," f2 -- Second file name",""," shallow -- treat files as identical if their stat signatures (type, size,"," mtime) are identical. Otherwise, files are considered different"," if their sizes or contents differ. [default: True]",""," Return value:",""," True if the files are the same, False otherwise.",""," This function uses a cache for past comparisons and the results,"," with cache entries invalidated if their stat information"," changes. The cache may be cleared by calling clear_cache().",""," \"\"\"",""," s1 = _sig(os.stat(f1))"," s2 = _sig(os.stat(f2))"," if s1[0] != stat.S_IFREG or s2[0] != stat.S_IFREG:"," return False"," if shallow and s1 == s2:"," return True"," if s1[1] != s2[1]:"," return False",""," outcome = _cache.get((f1, f2, s1, s2))"," if outcome is None:"," outcome = _do_cmp(f1, f2)"," if len(_cache) \u003e 100: # limit the maximum size of the cache"," clear_cache()"," _cache[f1, f2, s1, s2] = outcome"," return outcome","","def _sig(st):"," return (stat.S_IFMT(st.st_mode),"," st.st_size,"," st.st_mtime)","","def _do_cmp(f1, f2):"," bufsize = BUFSIZE"," with open(f1, 'rb') as fp1, open(f2, 'rb') as fp2:"," while True:"," b1 = fp1.read(bufsize)"," b2 = fp2.read(bufsize)"," if b1 != b2:"," return False"," if not b1:"," return True","","# Directory comparison class.","#","class dircmp:"," \"\"\"A class that manages the comparison of 2 directories.",""," dircmp(a, b, ignore=None, hide=None)"," A and B are directories."," IGNORE is a list of names to ignore,"," defaults to DEFAULT_IGNORES."," HIDE is a list of names to hide,"," defaults to [os.curdir, os.pardir].",""," High level usage:"," x = dircmp(dir1, dir2)"," x.report() -\u003e prints a report on the differences between dir1 and dir2"," or"," x.report_partial_closure() -\u003e prints report on differences between dir1"," and dir2, and reports on common immediate subdirectories."," x.report_full_closure() -\u003e like report_partial_closure,"," but fully recursive.",""," Attributes:"," left_list, right_list: The files in dir1 and dir2,"," filtered by hide and ignore."," common: a list of names in both dir1 and dir2."," left_only, right_only: names only in dir1, dir2."," common_dirs: subdirectories in both dir1 and dir2."," common_files: files in both dir1 and dir2."," common_funny: names in both dir1 and dir2 where the type differs between"," dir1 and dir2, or the name is not stat-able."," same_files: list of identical files."," diff_files: list of filenames which differ."," funny_files: list of files which could not be compared."," subdirs: a dictionary of dircmp instances (or MyDirCmp instances if this"," object is of type MyDirCmp, a subclass of dircmp), keyed by names"," in common_dirs."," \"\"\"",""," def __init__(self, a, b, ignore=None, hide=None): # Initialize"," self.left = a"," self.right = b"," if hide is None:"," self.hide = [os.curdir, os.pardir] # Names never to be shown"," else:"," self.hide = hide"," if ignore is None:"," self.ignore = DEFAULT_IGNORES"," else:"," self.ignore = ignore",""," def phase0(self): # Compare everything except common subdirectories"," self.left_list = _filter(os.listdir(self.left),"," self.hide+self.ignore)"," self.right_list = _filter(os.listdir(self.right),"," self.hide+self.ignore)"," self.left_list.sort()"," self.right_list.sort()",""," def phase1(self): # Compute common names"," a = dict(zip(map(os.path.normcase, self.left_list), self.left_list))"," b = dict(zip(map(os.path.normcase, self.right_list), self.right_list))"," self.common = list(map(a.__getitem__, filter(b.__contains__, a)))"," self.left_only = list(map(a.__getitem__, filterfalse(b.__contains__, a)))"," self.right_only = list(map(b.__getitem__, filterfalse(a.__contains__, b)))",""," def phase2(self): # Distinguish files, directories, funnies"," self.common_dirs = []"," self.common_files = []"," self.common_funny = []",""," for x in self.common:"," a_path = os.path.join(self.left, x)"," b_path = os.path.join(self.right, x)",""," ok = True"," try:"," a_stat = os.stat(a_path)"," except OSError:"," # print('Can\\'t stat', a_path, ':', why.args[1])"," ok = False"," try:"," b_stat = os.stat(b_path)"," except OSError:"," # print('Can\\'t stat', b_path, ':', why.args[1])"," ok = False",""," if ok:"," a_type = stat.S_IFMT(a_stat.st_mode)"," b_type = stat.S_IFMT(b_stat.st_mode)"," if a_type != b_type:"," self.common_funny.append(x)"," elif stat.S_ISDIR(a_type):"," self.common_dirs.append(x)"," elif stat.S_ISREG(a_type):"," self.common_files.append(x)"," else:"," self.common_funny.append(x)"," else:"," self.common_funny.append(x)",""," def phase3(self): # Find out differences between common files"," xx = cmpfiles(self.left, self.right, self.common_files)"," self.same_files, self.diff_files, self.funny_files = xx",""," def phase4(self): # Find out differences between common subdirectories"," # A new dircmp (or MyDirCmp if dircmp was subclassed) object is created"," # for each common subdirectory,"," # these are stored in a dictionary indexed by filename."," # The hide and ignore properties are inherited from the parent"," self.subdirs = {}"," for x in self.common_dirs:"," a_x = os.path.join(self.left, x)"," b_x = os.path.join(self.right, x)"," self.subdirs[x] = self.__class__(a_x, b_x, self.ignore, self.hide)",""," def phase4_closure(self): # Recursively call phase4() on subdirectories"," self.phase4()"," for sd in self.subdirs.values():"," sd.phase4_closure()",""," def report(self): # Print a report on the differences between a and b"," # Output format is purposely lousy"," print('diff', self.left, self.right)"," if self.left_only:"," self.left_only.sort()"," print('Only in', self.left, ':', self.left_only)"," if self.right_only:"," self.right_only.sort()"," print('Only in', self.right, ':', self.right_only)"," if self.same_files:"," self.same_files.sort()"," print('Identical files :', self.same_files)"," if self.diff_files:"," self.diff_files.sort()"," print('Differing files :', self.diff_files)"," if self.funny_files:"," self.funny_files.sort()"," print('Trouble with common files :', self.funny_files)"," if self.common_dirs:"," self.common_dirs.sort()"," print('Common subdirectories :', self.common_dirs)"," if self.common_funny:"," self.common_funny.sort()"," print('Common funny cases :', self.common_funny)",""," def report_partial_closure(self): # Print reports on self and on subdirs"," self.report()"," for sd in 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that compare equal"," files that are different"," filenames that aren't regular files.",""," \"\"\""," res = ([], [], [])"," for x in common:"," ax = os.path.join(a, x)"," bx = os.path.join(b, x)"," res[_cmp(ax, bx, shallow)].append(x)"," return res","","","# Compare two files.","# Return:","# 0 for equal","# 1 for different","# 2 for funny cases (can't stat, etc.)","#","def _cmp(a, b, sh, abs=abs, cmp=cmp):"," try:"," return not abs(cmp(a, b, sh))"," except OSError:"," return 2","","","# Return a copy with items that occur in skip removed.","#","def _filter(flist, skip):"," return list(filterfalse(skip.__contains__, flist))","","","# Demonstration and testing.","#","def demo():"," import sys"," import getopt"," options, args = getopt.getopt(sys.argv[1:], 'r')"," if len(args) != 2:"," raise getopt.GetoptError('need exactly two args', None)"," dd = dircmp(args[0], args[1])"," if ('-r', '') in options:"," dd.report_full_closure()"," else:"," dd.report()","","if __name__ == '__main__':"," 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