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# Module 'dirmp'
#
# Defines a class to build directory diff tools on.
import os
import dircache
import cmpcache
import statcache
from stat import *
# Directory comparison class.
#
class dircmp:
#
def new(dd, (a, b)): # Initialize
dd.a = a
dd.b = b
# Properties that caller may change before calling dd.run():
dd.hide = [os.curdir, os.pardir] # Names never to be shown
dd.ignore = ['RCS', 'tags'] # Names ignored in comparison
#
return dd
#
def run(dd): # Compare everything except common subdirectories
dd.a_list = filter(dircache.listdir(dd.a), dd.hide)
dd.b_list = filter(dircache.listdir(dd.b), dd.hide)
dd.a_list.sort()
dd.b_list.sort()
dd.phase1()
dd.phase2()
dd.phase3()
#
def phase1(dd): # Compute common names
dd.a_only = []
dd.common = []
for x in dd.a_list:
if x in dd.b_list:
dd.common.append(x)
else:
dd.a_only.append(x)
#
dd.b_only = []
for x in dd.b_list:
if x not in dd.common:
dd.b_only.append(x)
#
def phase2(dd): # Distinguish files, directories, funnies
dd.common_dirs = []
dd.common_files = []
dd.common_funny = []
#
for x in dd.common:
a_path = os.path.join(dd.a, x)
b_path = os.path.join(dd.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:
dd.common_funny.append(x)
elif S_ISDIR(a_type):
dd.common_dirs.append(x)
elif S_ISREG(a_type):
dd.common_files.append(x)
else:
dd.common_funny.append(x)
else:
dd.common_funny.append(x)
#
def phase3(dd): # Find out differences between common files
xx = cmpfiles(dd.a, dd.b, dd.common_files)
dd.same_files, dd.diff_files, dd.funny_files = xx
#
def phase4(dd): # 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
dd.subdirs = {}
for x in dd.common_dirs:
a_x = os.path.join(dd.a, x)
b_x = os.path.join(dd.b, x)
dd.subdirs[x] = newdd = dircmp().new(a_x, b_x)
newdd.hide = dd.hide
newdd.ignore = dd.ignore
newdd.run()
#
def phase4_closure(dd): # Recursively call phase4() on subdirectories
dd.phase4()
for x in dd.subdirs.keys():
dd.subdirs[x].phase4_closure()
#
def report(dd): # 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', dd.a, dd.b
if dd.a_only:
print 'Only in', dd.a, ':', dd.a_only
if dd.b_only:
print 'Only in', dd.b, ':', dd.b_only
if dd.same_files:
print 'Identical files :', dd.same_files
if dd.diff_files:
print 'Differing files :', dd.diff_files
if dd.funny_files:
print 'Trouble with common files :', dd.funny_files
if dd.common_dirs:
print 'Common subdirectories :', dd.common_dirs
if dd.common_funny:
print 'Common funny cases :', dd.common_funny
#
def report_closure(dd): # Print reports on dd and on subdirs
# If phase 4 hasn't been done, no subdir reports are printed
dd.report()
try:
x = dd.subdirs
except AttributeError:
return # No subdirectories computed
for x in dd.subdirs.keys():
print
dd.subdirs[x].report_closure()
#
def report_phase4_closure(dd): # Report and do phase 4 recursively
dd.report()
dd.phase4()
for x in dd.subdirs.keys():
print
dd.subdirs[x].report_phase4_closure()
# Compare common files in two directories.
# Return:
# - files that compare equal
# - files that compare different
# - funny cases (can't stat etc.)
#
def cmpfiles(a, b, common):
res = ([], [], [])
for x in common:
res[cmp(os.path.join(a, x), os.path.join(b, x))].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):
try:
if cmpcache.cmp(a, b): return 0
return 1
except os.error:
return 2
# Remove a list item.
# NB: This modifies the list argument.
#
def remove(list, item):
for i in range(len(list)):
if list[i] == item:
del list[i]
break
# Return a copy with items that occur in skip removed.
#
def filter(list, skip):
result = []
for item in list:
if item not in skip: result.append(item)
return result
# Demonstration and testing.
#
def demo():
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()
# demo()
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