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dsCmp.py
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dsCmp.py
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'''
Author: Kazark
Purpose: Directory synchronization operations
For further info see dirspync.py
'''
__all__ = ['Dir', 'File', 'Time', 'fSize', 'DirCmp', 'diffNode',
'LO', 'LN', 'SA', 'RN', 'RO', 'SZ', 'DT',
'INCLUDE_ALL', 'INCLUDE_DIFF', 'MODES']
MODES = [LO, LN, SA, RN, RO, SZ, DT] = [2**n for n in range(7)]
INCLUDE_ALL = sum(MODES)
INCLUDE_DIFF = INCLUDE_ALL - SA - DT
#import cmd # for building an interactive shell
#import getopt # for parsing cmdline options--better builtin doc than optparse
import os
import time
import math # the logarithmic function used in file size string formatting
import hashlib
from dsStr import minusstr, ellipsize
DIRSEP = os.path.sep
class File:
def __init__(self, name, prefix):
self.name = name.rstrip(DIRSEP)
self.prefix = prefix.rstrip(DIRSEP)
def __format__(self, format_spec):
return format(self.name, format_func)
def path(self):
return self.prefix + DIRSEP*(bool(self.prefix)) + self.name
def mtime(self):
return Time(os.stat(self.path()).st_mtime)
def size(self):
return fSize(os.stat(self.path()).st_size)
# Thanks to Nathan Feger http://stackoverflow.com/a/11143944/834176
def md5sum(self):
md5 = hashlib.md5()
with open(self.path(), 'rb') as f:
for chunk in iter(lambda: f.read(128 * md5.block_size), b''):
md5.update(chunk)
return md5.hexdigest()
class Dir(dict, File):
def __init__(self, name, prefix):
dict.__init__(self)
File.__init__(self, name, prefix)
self.subds = dict()
def refresh(self, showdot=False, showtilde=False):
try:
names = os.listdir(self.path())
except OSError as ex:
print(ex)
raise SystemExit
self.subds = dict()
for name in names:
if (not showdot) and name.startswith('.'): continue
if (not showtilde) and name.endswith('~'): continue
if os.path.isdir(self.path()+DIRSEP+name):
self.subds[name] = Dir(name, self.path())
else:
self[name] = File(name, self.path())
def size(self):
self.refresh()
return fSize(sum([f.size() for f in self.values()]) + File.size(self) +\
sum([d.size() for d in self.subds.values()]))
class MetaDir:
def __init__(self, name, subds=None):
self.name = str(name)
if subds==None:
self.subds = dict()
else:
self.setsubds(subds)
def setsubds(self, subds):
for d in subds:
self.subds[d] = Dir(d)
class Time(float):
def __str__(self):
return str(fTime(time.localtime(self)))
def __format__(self, format_spec):
return format(str(self), format_spec)
class fTime:
def __init__(self, localtime):
self.dayOfWeek = fDayOfWeek(localtime)
self.dayOfYear = fDayOfYear(localtime)
self.timeOfDay = fTimeOfDay(localtime)
def __str__(self):
return "{0} {1} {2}".format(self.dayOfWeek, self.dayOfYear, self.timeOfDay)
def __format__(self, format_spec):
return format(str(self), format_spec)
class fDayOfWeek:
def __init__(self, localtime):
self.__day = localtime.tm_wday
def __str__(self):
return ['Mon', 'Tue', 'Wed', 'Th', 'Fri', 'Sat', 'Sun'][self.__day]
def __format__(self, format_spec):
return format(str(self), format_spec)
class fDayOfYear:
def __init__(self, localtime):
self.__year = localtime.tm_year
self.__month = localtime.tm_mon
self.__day = localtime.tm_mday
def __str__(self):
return "{0}/{1}/{2}".format(self.__year, self.__month, self.__day)
def __format__(self, format_spec):
return format(str(self), format_spec)
class fTimeOfDay:
def __init__(self, localtime):
self.__hour = localtime.tm_hour
self.__min = localtime.tm_min
self.__sec = localtime.tm_sec
def __str__(self):
return "{0}:{0:02}:{0:02}".format(self.__hour, self.__min, self.__sec)
def __format__(self, format_spec):
return format(str(self), format_spec)
class fSize(int):
def __new__(cls, size):
return int.__new__(cls, size)
def __init__(self, size, k=1024):
self.k = k
def trunk(self):
return self/self.k**self._pwr()
def _pwr(self):
return 0 if self == 0 else int(math.log(self) / math.log(self.k))
def suffix(self):
return ['B', 'K', 'M', 'G', 'T', 'P'][self._pwr()]
def __format__(self, format_spec):
return format(str(self), format_spec)
def __str__(self):
return '{0:4.2f}{1}'.format(self.trunk(), self.suffix())
def __format__(self, format_spec):
return format(str(self), format_spec)
class FileComparer:
def __init__(self, dterr=1):
self.dterr = dterr
def compare(self, lf, rf):
return self.__compare(lf.mtime(), rf.mtime(), lf.size(), rf.size(), lf.md5sum, rf.md5sum)
def __compare(self, lt, rt, ls, rs, lhash, rhash):
absdiff = abs(lt-rt)
if (absdiff<=self.dterr) and ls == rs:
return SA
elif (absdiff%3600==0 or absdiff%3600==self.dterr or absdiff%3600==3600-self.dterr) and ls == rs and absdiff<(3600*24):
return DT
elif lt==rt and ls != rs: # Same timestamp, different size
# requires special user attention
return SZ
elif lhash() == rhash():
return SA # TODO these two-letters constants are awful...
elif lt > rt: # LEFT NEWER
return LN
elif lt < rt: # RIGHT NEWER
return RN
# no else
class DirCmp:
def __init__(self, mode, ldir, rdir, *args, **kwargs):
'''ldir and rdir should be Dir objects'''
self.mode = mode
self.fcmp = FileComparer()
self.args, self.kwargs = args, kwargs
self.l = ldir
self.r = rdir
self.union = self.pathunion(self.l.path(), self.r.path())
self.ldiff = minusstr(self.l.path(), self.union)
self.rdiff = minusstr(self.r.path(), self.union)
def pathunion(self, str1:str, str2:str) -> str:
s = ''
for i1, i2 in zip(reversed(str1.split(DIRSEP)), reversed(str2.split(DIRSEP))):
if i2 == i1:
s = DIRSEP + i1 + s
else: break
return s
def refresh(self):
self.l.refresh(*self.args, **self.kwargs)
self.r.refresh(*self.args, **self.kwargs)
def compare(self):
self.refresh()
dct = diffNode(self.mode)
if len(self.l) == 0:
dct[RO] += self.r.values()
elif len(self.r) == 0:
dct[LO] += self.l.values()
else:
for lf in self.l.values():
try:
rf = self.r.pop(lf.name)
except KeyError:
dct[LO].append(lf)
else:
dct[self.fcmp.compare(lf, rf)].append((lf, rf))
dct[RO] += self.r.values()
if len(self.l.subds) == 0:
dct[RO] += self.r.subds.values()
elif len(self.r.subds) == 0:
dct[LO] += self.l.subds.values()
else:
for ld in self.l.subds.values():
try:
rd = self.r.subds.pop(ld.name)
except KeyError:
dct[LO].append(ld)
else:
dct.children.append(self.__class__(self.mode, ld, rd))
dct[RO] += self.r.subds.values()
return dct
class diffNode(dict):
def __init__(self, mode):
dict.__init__(self)
self.mode = mode
for i in MODES:
self[i] = list()
self.children = list()
def __getitem__(self, k):
if k in MODES and not self.mode & k:
return list()
else:
return dict.__getitem__(self, k)