snapshot: consider all snapshots in the parents' chains
There are no reasons to only consider full snapshot as a possible base for an
intermediate snapshot. Now that the basic principles have been set, we can
start adding more levels of snapshots.
We now consider all snapshots in the parent's chains (full or intermediate).
This creates a chain of intermediate snapshots, each smaller than the previous
one.
# Effect On The Test Repository
In the test repository, we can see a decrease in the revlog size and slightly
shorter delta chain.
However, that approach creates snapshots more frequently, increasing the risk
of ending into problematic cases in very branchy repositories (not triggered
by the test repository). The next changesets will remove that risk by adding
logic that increases deltas reuse.
# util.py - Mercurial utility functions relative to dates
#
# Copyright 2018 Boris Feld <boris.feld@octobus.net>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import, print_function
import calendar
import datetime
import time
from ..i18n import _
from .. import (
encoding,
error,
pycompat,
)
# used by parsedate
defaultdateformats = (
'%Y-%m-%dT%H:%M:%S', # the 'real' ISO8601
'%Y-%m-%dT%H:%M', # without seconds
'%Y-%m-%dT%H%M%S', # another awful but legal variant without :
'%Y-%m-%dT%H%M', # without seconds
'%Y-%m-%d %H:%M:%S', # our common legal variant
'%Y-%m-%d %H:%M', # without seconds
'%Y-%m-%d %H%M%S', # without :
'%Y-%m-%d %H%M', # without seconds
'%Y-%m-%d %I:%M:%S%p',
'%Y-%m-%d %H:%M',
'%Y-%m-%d %I:%M%p',
'%Y-%m-%d',
'%m-%d',
'%m/%d',
'%m/%d/%y',
'%m/%d/%Y',
'%a %b %d %H:%M:%S %Y',
'%a %b %d %I:%M:%S%p %Y',
'%a, %d %b %Y %H:%M:%S', # GNU coreutils "/bin/date --rfc-2822"
'%b %d %H:%M:%S %Y',
'%b %d %I:%M:%S%p %Y',
'%b %d %H:%M:%S',
'%b %d %I:%M:%S%p',
'%b %d %H:%M',
'%b %d %I:%M%p',
'%b %d %Y',
'%b %d',
'%H:%M:%S',
'%I:%M:%S%p',
'%H:%M',
'%I:%M%p',
)
extendeddateformats = defaultdateformats + (
"%Y",
"%Y-%m",
"%b",
"%b %Y",
)
def makedate(timestamp=None):
'''Return a unix timestamp (or the current time) as a (unixtime,
offset) tuple based off the local timezone.'''
if timestamp is None:
timestamp = time.time()
if timestamp < 0:
hint = _("check your clock")
raise error.Abort(_("negative timestamp: %d") % timestamp, hint=hint)
delta = (datetime.datetime.utcfromtimestamp(timestamp) -
datetime.datetime.fromtimestamp(timestamp))
tz = delta.days * 86400 + delta.seconds
return timestamp, tz
def datestr(date=None, format='%a %b %d %H:%M:%S %Y %1%2'):
"""represent a (unixtime, offset) tuple as a localized time.
unixtime is seconds since the epoch, and offset is the time zone's
number of seconds away from UTC.
>>> datestr((0, 0))
'Thu Jan 01 00:00:00 1970 +0000'
>>> datestr((42, 0))
'Thu Jan 01 00:00:42 1970 +0000'
>>> datestr((-42, 0))
'Wed Dec 31 23:59:18 1969 +0000'
>>> datestr((0x7fffffff, 0))
'Tue Jan 19 03:14:07 2038 +0000'
>>> datestr((-0x80000000, 0))
'Fri Dec 13 20:45:52 1901 +0000'
"""
t, tz = date or makedate()
if "%1" in format or "%2" in format or "%z" in format:
sign = (tz > 0) and "-" or "+"
minutes = abs(tz) // 60
q, r = divmod(minutes, 60)
format = format.replace("%z", "%1%2")
format = format.replace("%1", "%c%02d" % (sign, q))
format = format.replace("%2", "%02d" % r)
d = t - tz
if d > 0x7fffffff:
d = 0x7fffffff
elif d < -0x80000000:
d = -0x80000000
# Never use time.gmtime() and datetime.datetime.fromtimestamp()
# because they use the gmtime() system call which is buggy on Windows
# for negative values.
t = datetime.datetime(1970, 1, 1) + datetime.timedelta(seconds=d)
s = encoding.strtolocal(t.strftime(encoding.strfromlocal(format)))
return s
def shortdate(date=None):
"""turn (timestamp, tzoff) tuple into iso 8631 date."""
return datestr(date, format='%Y-%m-%d')
def parsetimezone(s):
"""find a trailing timezone, if any, in string, and return a
(offset, remainder) pair"""
s = pycompat.bytestr(s)
if s.endswith("GMT") or s.endswith("UTC"):
return 0, s[:-3].rstrip()
# Unix-style timezones [+-]hhmm
if len(s) >= 5 and s[-5] in "+-" and s[-4:].isdigit():
sign = (s[-5] == "+") and 1 or -1
hours = int(s[-4:-2])
minutes = int(s[-2:])
return -sign * (hours * 60 + minutes) * 60, s[:-5].rstrip()
# ISO8601 trailing Z
if s.endswith("Z") and s[-2:-1].isdigit():
return 0, s[:-1]
# ISO8601-style [+-]hh:mm
if (len(s) >= 6 and s[-6] in "+-" and s[-3] == ":" and
s[-5:-3].isdigit() and s[-2:].isdigit()):
sign = (s[-6] == "+") and 1 or -1
hours = int(s[-5:-3])
minutes = int(s[-2:])
return -sign * (hours * 60 + minutes) * 60, s[:-6]
return None, s
def strdate(string, format, defaults=None):
"""parse a localized time string and return a (unixtime, offset) tuple.
if the string cannot be parsed, ValueError is raised."""
if defaults is None:
defaults = {}
# NOTE: unixtime = localunixtime + offset
offset, date = parsetimezone(string)
# add missing elements from defaults
usenow = False # default to using biased defaults
for part in ("S", "M", "HI", "d", "mb", "yY"): # decreasing specificity
part = pycompat.bytestr(part)
found = [True for p in part if ("%"+p) in format]
if not found:
date += "@" + defaults[part][usenow]
format += "@%" + part[0]
else:
# We've found a specific time element, less specific time
# elements are relative to today
usenow = True
timetuple = time.strptime(encoding.strfromlocal(date),
encoding.strfromlocal(format))
localunixtime = int(calendar.timegm(timetuple))
if offset is None:
# local timezone
unixtime = int(time.mktime(timetuple))
offset = unixtime - localunixtime
else:
unixtime = localunixtime + offset
return unixtime, offset
def parsedate(date, formats=None, bias=None):
"""parse a localized date/time and return a (unixtime, offset) tuple.
The date may be a "unixtime offset" string or in one of the specified
formats. If the date already is a (unixtime, offset) tuple, it is returned.
>>> parsedate(b' today ') == parsedate(
... datetime.date.today().strftime('%b %d').encode('ascii'))
True
>>> parsedate(b'yesterday ') == parsedate(
... (datetime.date.today() - datetime.timedelta(days=1)
... ).strftime('%b %d').encode('ascii'))
True
>>> now, tz = makedate()
>>> strnow, strtz = parsedate(b'now')
>>> (strnow - now) < 1
True
>>> tz == strtz
True
"""
if bias is None:
bias = {}
if not date:
return 0, 0
if isinstance(date, tuple) and len(date) == 2:
return date
if not formats:
formats = defaultdateformats
date = date.strip()
if date == 'now' or date == _('now'):
return makedate()
if date == 'today' or date == _('today'):
date = datetime.date.today().strftime(r'%b %d')
date = encoding.strtolocal(date)
elif date == 'yesterday' or date == _('yesterday'):
date = (datetime.date.today() -
datetime.timedelta(days=1)).strftime(r'%b %d')
date = encoding.strtolocal(date)
try:
when, offset = map(int, date.split(' '))
except ValueError:
# fill out defaults
now = makedate()
defaults = {}
for part in ("d", "mb", "yY", "HI", "M", "S"):
# this piece is for rounding the specific end of unknowns
b = bias.get(part)
if b is None:
if part[0:1] in "HMS":
b = "00"
else:
b = "0"
# this piece is for matching the generic end to today's date
n = datestr(now, "%" + part[0:1])
defaults[part] = (b, n)
for format in formats:
try:
when, offset = strdate(date, format, defaults)
except (ValueError, OverflowError):
pass
else:
break
else:
raise error.ParseError(
_('invalid date: %r') % pycompat.bytestr(date))
# validate explicit (probably user-specified) date and
# time zone offset. values must fit in signed 32 bits for
# current 32-bit linux runtimes. timezones go from UTC-12
# to UTC+14
if when < -0x80000000 or when > 0x7fffffff:
raise error.ParseError(_('date exceeds 32 bits: %d') % when)
if offset < -50400 or offset > 43200:
raise error.ParseError(_('impossible time zone offset: %d') % offset)
return when, offset
def matchdate(date):
"""Return a function that matches a given date match specifier
Formats include:
'{date}' match a given date to the accuracy provided
'<{date}' on or before a given date
'>{date}' on or after a given date
>>> p1 = parsedate(b"10:29:59")
>>> p2 = parsedate(b"10:30:00")
>>> p3 = parsedate(b"10:30:59")
>>> p4 = parsedate(b"10:31:00")
>>> p5 = parsedate(b"Sep 15 10:30:00 1999")
>>> f = matchdate(b"10:30")
>>> f(p1[0])
False
>>> f(p2[0])
True
>>> f(p3[0])
True
>>> f(p4[0])
False
>>> f(p5[0])
False
"""
def lower(date):
d = {'mb': "1", 'd': "1"}
return parsedate(date, extendeddateformats, d)[0]
def upper(date):
d = {'mb': "12", 'HI': "23", 'M': "59", 'S': "59"}
for days in ("31", "30", "29"):
try:
d["d"] = days
return parsedate(date, extendeddateformats, d)[0]
except error.ParseError:
pass
d["d"] = "28"
return parsedate(date, extendeddateformats, d)[0]
date = date.strip()
if not date:
raise error.Abort(_("dates cannot consist entirely of whitespace"))
elif date[0] == "<":
if not date[1:]:
raise error.Abort(_("invalid day spec, use '<DATE'"))
when = upper(date[1:])
return lambda x: x <= when
elif date[0] == ">":
if not date[1:]:
raise error.Abort(_("invalid day spec, use '>DATE'"))
when = lower(date[1:])
return lambda x: x >= when
elif date[0] == "-":
try:
days = int(date[1:])
except ValueError:
raise error.Abort(_("invalid day spec: %s") % date[1:])
if days < 0:
raise error.Abort(_("%s must be nonnegative (see 'hg help dates')")
% date[1:])
when = makedate()[0] - days * 3600 * 24
return lambda x: x >= when
elif " to " in date:
a, b = date.split(" to ")
start, stop = lower(a), upper(b)
return lambda x: x >= start and x <= stop
else:
start, stop = lower(date), upper(date)
return lambda x: x >= start and x <= stop