| """A class to build directory diff tools on.""" |
| |
| import os |
| |
| import dircache |
| import cmpcache |
| import statcache |
| from stat import * |
| |
| class dircmp: |
| """Directory comparison class.""" |
| |
| def new(self, a, b): |
| """Initialize.""" |
| self.a = a |
| self.b = b |
| # Properties that caller may change before calling self.run(): |
| self.hide = [os.curdir, os.pardir] # Names never to be shown |
| self.ignore = ['RCS', 'tags'] # Names ignored in comparison |
| |
| return self |
| |
| def run(self): |
| """Compare everything except common subdirectories.""" |
| self.a_list = filter(dircache.listdir(self.a), self.hide) |
| self.b_list = filter(dircache.listdir(self.b), self.hide) |
| self.a_list.sort() |
| self.b_list.sort() |
| self.phase1() |
| self.phase2() |
| self.phase3() |
| |
| def phase1(self): |
| """Compute common names.""" |
| self.a_only = [] |
| self.common = [] |
| for x in self.a_list: |
| if x in self.b_list: |
| self.common.append(x) |
| else: |
| self.a_only.append(x) |
| |
| self.b_only = [] |
| for x in self.b_list: |
| if x not in self.common: |
| self.b_only.append(x) |
| |
| 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.a, x) |
| b_path = os.path.join(self.b, x) |
| |
| ok = 1 |
| try: |
| a_stat = statcache.stat(a_path) |
| except os.error, why: |
| # print 'Can\'t stat', a_path, ':', why[1] |
| ok = 0 |
| try: |
| b_stat = statcache.stat(b_path) |
| except os.error, why: |
| # print 'Can\'t stat', b_path, ':', why[1] |
| ok = 0 |
| |
| if ok: |
| a_type = S_IFMT(a_stat[ST_MODE]) |
| b_type = S_IFMT(b_stat[ST_MODE]) |
| if a_type != b_type: |
| self.common_funny.append(x) |
| elif S_ISDIR(a_type): |
| self.common_dirs.append(x) |
| elif 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.a, self.b, 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 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.a, x) |
| b_x = os.path.join(self.b, x) |
| self.subdirs[x] = newdd = dircmp().new(a_x, b_x) |
| newdd.hide = self.hide |
| newdd.ignore = self.ignore |
| newdd.run() |
| |
| def phase4_closure(self): |
| """Recursively call phase4() on subdirectories.""" |
| self.phase4() |
| for x in self.subdirs.keys(): |
| self.subdirs[x].phase4_closure() |
| |
| def report(self): |
| """Print a report on the differences between a and b.""" |
| # Assume that phases 1 to 3 have been executed |
| # Output format is purposely lousy |
| print 'diff', self.a, self.b |
| if self.a_only: |
| print 'Only in', self.a, ':', self.a_only |
| if self.b_only: |
| print 'Only in', self.b, ':', self.b_only |
| if self.same_files: |
| print 'Identical files :', self.same_files |
| if self.diff_files: |
| print 'Differing files :', self.diff_files |
| if self.funny_files: |
| print 'Trouble with common files :', self.funny_files |
| if self.common_dirs: |
| print 'Common subdirectories :', self.common_dirs |
| if self.common_funny: |
| print 'Common funny cases :', self.common_funny |
| |
| def report_closure(self): |
| """Print reports on self and on subdirs. |
| If phase 4 hasn't been done, no subdir reports are printed.""" |
| self.report() |
| try: |
| x = self.subdirs |
| except AttributeError: |
| return # No subdirectories computed |
| for x in self.subdirs.keys(): |
| print |
| self.subdirs[x].report_closure() |
| |
| def report_phase4_closure(self): |
| """Report and do phase 4 recursively.""" |
| self.report() |
| self.phase4() |
| for x in self.subdirs.keys(): |
| print |
| self.subdirs[x].report_phase4_closure() |
| |
| |
| def cmpfiles(a, b, common): |
| """Compare common files in two directories. |
| Return: |
| - files that compare equal |
| - files that compare different |
| - funny cases (can't stat etc.)""" |
| |
| res = ([], [], []) |
| for x in common: |
| res[cmp(os.path.join(a, x), os.path.join(b, x))].append(x) |
| return res |
| |
| |
| def cmp(a, b): |
| """Compare two files. |
| Return: |
| 0 for equal |
| 1 for different |
| 2 for funny cases (can't stat, etc.)""" |
| |
| try: |
| if cmpcache.cmp(a, b): return 0 |
| return 1 |
| except os.error: |
| return 2 |
| |
| |
| def filter(list, skip): |
| """Return a copy with items that occur in skip removed.""" |
| |
| result = [] |
| for item in list: |
| if item not in skip: result.append(item) |
| return result |
| |
| |
| def demo(): |
| """Demonstration and testing.""" |
| |
| import sys |
| import getopt |
| options, args = getopt.getopt(sys.argv[1:], 'r') |
| if len(args) != 2: |
| raise getopt.error, 'need exactly two args' |
| dd = dircmp().new(args[0], args[1]) |
| dd.run() |
| if ('-r', '') in options: |
| dd.report_phase4_closure() |
| else: |
| dd.report() |
| |
| if __name__ == "__main__": |
| demo() |