Add pylint to depot_tools.

third_party/logilab/common/date.py

Index: third_party/logilab/common/date.py
diff --git a/third_party/logilab/common/date.py b/third_party/logilab/common/date.py
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+# copyright 2003-2011 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
+# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This file is part of logilab-common.
+#
+# logilab-common is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Lesser General Public License as published by the Free
+# Software Foundation, either version 2.1 of the License, or (at your option) any
+# later version.
+#
+# logilab-common is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+# FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Lesser General Public License along
+# with logilab-common.  If not, see <http://www.gnu.org/licenses/>.
+"""Date manipulation helper functions."""
+from __future__ import division
+
+__docformat__ = "restructuredtext en"
+
+import math
+import re
+from locale import getpreferredencoding
+from datetime import date, time, datetime, timedelta
+from time import strptime as time_strptime
+from calendar import monthrange, timegm
+
+try:
+    from mx.DateTime import RelativeDateTime, Date, DateTimeType
+except ImportError:
+    endOfMonth = None
+    DateTimeType = datetime
+else:
+    endOfMonth = RelativeDateTime(months=1, day=-1)
+
+# NOTE: should we implement a compatibility layer between date representations
+#       as we have in lgc.db ?
+
+FRENCH_FIXED_HOLIDAYS = {
+    'jour_an': '%s-01-01',
+    'fete_travail': '%s-05-01',
+    'armistice1945': '%s-05-08',
+    'fete_nat': '%s-07-14',
+    'assomption': '%s-08-15',
+    'toussaint': '%s-11-01',
+    'armistice1918': '%s-11-11',
+    'noel': '%s-12-25',
+    }
+
+FRENCH_MOBILE_HOLIDAYS = {
+    'paques2004': '2004-04-12',
+    'ascension2004': '2004-05-20',
+    'pentecote2004': '2004-05-31',
+
+    'paques2005': '2005-03-28',
+    'ascension2005': '2005-05-05',
+    'pentecote2005': '2005-05-16',
+
+    'paques2006': '2006-04-17',
+    'ascension2006': '2006-05-25',
+    'pentecote2006': '2006-06-05',
+
+    'paques2007': '2007-04-09',
+    'ascension2007': '2007-05-17',
+    'pentecote2007': '2007-05-28',
+
+    'paques2008': '2008-03-24',
+    'ascension2008': '2008-05-01',
+    'pentecote2008': '2008-05-12',
+
+    'paques2009': '2009-04-13',
+    'ascension2009': '2009-05-21',
+    'pentecote2009': '2009-06-01',
+
+    'paques2010': '2010-04-05',
+    'ascension2010': '2010-05-13',
+    'pentecote2010': '2010-05-24',
+
+    'paques2011': '2011-04-25',
+    'ascension2011': '2011-06-02',
+    'pentecote2011': '2011-06-13',
+
+    'paques2012': '2012-04-09',
+    'ascension2012': '2012-05-17',
+    'pentecote2012': '2012-05-28',
+    }
+
+# XXX this implementation cries for multimethod dispatching
+
+def get_step(dateobj, nbdays=1):
+    # assume date is either a python datetime or a mx.DateTime object
+    if isinstance(dateobj, date):
+        return ONEDAY * nbdays
+    return nbdays # mx.DateTime is ok with integers
+
+def datefactory(year, month, day, sampledate):
+    # assume date is either a python datetime or a mx.DateTime object
+    if isinstance(sampledate, datetime):
+        return datetime(year, month, day)
+    if isinstance(sampledate, date):
+        return date(year, month, day)
+    return Date(year, month, day)
+
+def weekday(dateobj):
+    # assume date is either a python datetime or a mx.DateTime object
+    if isinstance(dateobj, date):
+        return dateobj.weekday()
+    return dateobj.day_of_week
+
+def str2date(datestr, sampledate):
+    # NOTE: datetime.strptime is not an option until we drop py2.4 compat
+    year, month, day = [int(chunk) for chunk in datestr.split('-')]
+    return datefactory(year, month, day, sampledate)
+
+def days_between(start, end):
+    if isinstance(start, date):
+        delta = end - start
+        # datetime.timedelta.days is always an integer (floored)
+        if delta.seconds:
+            return delta.days + 1
+        return delta.days
+    else:
+        return int(math.ceil((end - start).days))
+
+def get_national_holidays(begin, end):
+    """return french national days off between begin and end"""
+    begin = datefactory(begin.year, begin.month, begin.day, begin)
+    end = datefactory(end.year, end.month, end.day, end)
+    holidays = [str2date(datestr, begin)
+                for datestr in FRENCH_MOBILE_HOLIDAYS.values()]
+    for year in xrange(begin.year, end.year+1):
+        for datestr in FRENCH_FIXED_HOLIDAYS.values():
+            date = str2date(datestr % year, begin)
+            if date not in holidays:
+                holidays.append(date)
+    return [day for day in holidays if begin <= day < end]
+
+def add_days_worked(start, days):
+    """adds date but try to only take days worked into account"""
+    step = get_step(start)
+    weeks, plus = divmod(days, 5)
+    end = start + ((weeks * 7) + plus) * step
+    if weekday(end) >= 5: # saturday or sunday
+        end += (2 * step)
+    end += len([x for x in get_national_holidays(start, end + step)
+                if weekday(x) < 5]) * step
+    if weekday(end) >= 5: # saturday or sunday
+        end += (2 * step)
+    return end
+
+def nb_open_days(start, end):
+    assert start <= end
+    step = get_step(start)
+    days = days_between(start, end)
+    weeks, plus = divmod(days, 7)
+    if weekday(start) > weekday(end):
+        plus -= 2
+    elif weekday(end) == 6:
+        plus -= 1
+    open_days = weeks * 5 + plus
+    nb_week_holidays = len([x for x in get_national_holidays(start, end+step)
+                            if weekday(x) < 5 and x < end])
+    open_days -= nb_week_holidays
+    if open_days < 0:
+        return 0
+    return open_days
+
+def date_range(begin, end, incday=None, incmonth=None):
+    """yields each date between begin and end
+
+    :param begin: the start date
+    :param end: the end date
+    :param incr: the step to use to iterate over dates. Default is
+                 one day.
+    :param include: None (means no exclusion) or a function taking a
+                    date as parameter, and returning True if the date
+                    should be included.
+
+    When using mx datetime, you should *NOT* use incmonth argument, use instead
+    oneDay, oneHour, oneMinute, oneSecond, oneWeek or endOfMonth (to enumerate
+    months) as `incday` argument
+    """
+    assert not (incday and incmonth)
+    begin = todate(begin)
+    end = todate(end)
+    if incmonth:
+        while begin < end:
+            begin = next_month(begin, incmonth)
+            yield begin
+    else:
+        incr = get_step(begin, incday or 1)
+        while begin < end:
+           yield begin
+           begin += incr
+
+# makes py datetime usable #####################################################
+
+ONEDAY = timedelta(days=1)
+ONEWEEK = timedelta(days=7)
+
+try:
+    strptime = datetime.strptime
+except AttributeError: # py < 2.5
+    from time import strptime as time_strptime
+    def strptime(value, format):
+        return datetime(*time_strptime(value, format)[:6])
+
+def strptime_time(value, format='%H:%M'):
+    return time(*time_strptime(value, format)[3:6])
+
+def todate(somedate):
+    """return a date from a date (leaving unchanged) or a datetime"""
+    if isinstance(somedate, datetime):
+        return date(somedate.year, somedate.month, somedate.day)
+    assert isinstance(somedate, (date, DateTimeType)), repr(somedate)
+    return somedate
+
+def totime(somedate):
+    """return a time from a time (leaving unchanged), date or datetime"""
+    # XXX mx compat
+    if not isinstance(somedate, time):
+        return time(somedate.hour, somedate.minute, somedate.second)
+    assert isinstance(somedate, (time)), repr(somedate)
+    return somedate
+
+def todatetime(somedate):
+    """return a date from a date (leaving unchanged) or a datetime"""
+    # take care, datetime is a subclass of date
+    if isinstance(somedate, datetime):
+        return somedate
+    assert isinstance(somedate, (date, DateTimeType)), repr(somedate)
+    return datetime(somedate.year, somedate.month, somedate.day)
+
+def datetime2ticks(somedate):
+    return timegm(somedate.timetuple()) * 1000
+
+def ticks2datetime(ticks):
+    miliseconds, microseconds = divmod(ticks, 1000)
+    try:
+        return datetime.fromtimestamp(miliseconds)
+    except (ValueError, OverflowError):
+        epoch = datetime.fromtimestamp(0)
+        nb_days, seconds = divmod(int(miliseconds), 86400)
+        delta = timedelta(nb_days, seconds=seconds, microseconds=microseconds)
+        try:
+            return epoch + delta
+        except (ValueError, OverflowError):
+            raise
+
+def days_in_month(somedate):
+    return monthrange(somedate.year, somedate.month)[1]
+
+def days_in_year(somedate):
+    feb = date(somedate.year, 2, 1)
+    if days_in_month(feb) == 29:
+        return 366
+    else:
+        return 365
+
+def previous_month(somedate, nbmonth=1):
+    while nbmonth:
+        somedate = first_day(somedate) - ONEDAY
+        nbmonth -= 1
+    return somedate
+
+def next_month(somedate, nbmonth=1):
+    while nbmonth:
+        somedate = last_day(somedate) + ONEDAY
+        nbmonth -= 1
+    return somedate
+
+def first_day(somedate):
+    return date(somedate.year, somedate.month, 1)
+
+def last_day(somedate):
+    return date(somedate.year, somedate.month, days_in_month(somedate))
+
+def ustrftime(somedate, fmt='%Y-%m-%d'):
+    """like strftime, but returns a unicode string instead of an encoded
+    string which' may be problematic with localized date.
+
+    encoding is guessed by locale.getpreferredencoding()
+    """
+    encoding = getpreferredencoding(do_setlocale=False) or 'UTF-8'
+    try:
+        return unicode(somedate.strftime(str(fmt)), encoding)
+    except ValueError, exc:
+        if somedate.year >= 1900:
+            raise
+        # datetime is not happy with dates before 1900
+        # we try to work around this, assuming a simple
+        # format string
+        fields = {'Y': somedate.year,
+                  'm': somedate.month,
+                  'd': somedate.day,
+                  }
+        if isinstance(somedate, datetime):
+            fields.update({'H': somedate.hour,
+                           'M': somedate.minute,
+                           'S': somedate.second})
+        fmt = re.sub('%([YmdHMS])', r'%(\1)02d', fmt)
+        return unicode(fmt) % fields
+
+def utcdatetime(dt):
+    if dt.tzinfo is None:
+        return dt
+    return datetime(*dt.utctimetuple()[:7])
+
+def utctime(dt):
+    if dt.tzinfo is None:
+        return dt
+    return (dt + dt.utcoffset() + dt.dst()).replace(tzinfo=None)
+
+def datetime_to_seconds(date):
+    """return the number of seconds since the begining of the day for that date
+    """
+    return date.second+60*date.minute + 3600*date.hour
+
+def timedelta_to_days(delta):
+    """return the time delta as a number of seconds"""
+    return delta.days + delta.seconds / (3600*24)
+
+def timedelta_to_seconds(delta):
+    """return the time delta as a fraction of days"""
+    return delta.days*(3600*24) + delta.seconds