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# -*- coding: utf-8 -*-
# -----------------------------------------------------------------------------
# Gettings Things Gnome! - a personal organizer for the GNOME desktop
# Copyright (c) 2008-2012 - Lionel Dricot & Bertrand Rousseau
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation, either version 3 of the License, or (at your option) any later
# version.
#
# This program 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 General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along with
# this program. If not, see <http://www.gnu.org/licenses/>.
# -----------------------------------------------------------------------------
import calendar
import datetime
import locale
from GTG import _, ngettext
__all__ = 'Date',
locale.setlocale(locale.LC_TIME, '')
NOW, SOON, SOMEDAY, NODATE = range(4)
# strings representing fuzzy dates + no date
ENGLISH_STRINGS = {
NOW: 'now',
SOON: 'soon',
SOMEDAY: 'someday',
NODATE: '',
}
STRINGS = {
NOW: _('now'),
SOON: _('soon'),
SOMEDAY: _('someday'),
NODATE: '',
}
LOOKUP = {
'now': NOW,
_('now').lower(): NOW,
'soon': SOON,
_('soon').lower(): SOON,
'later': SOMEDAY,
_('later').lower(): SOMEDAY,
'someday': SOMEDAY,
_('someday').lower(): SOMEDAY,
'': NODATE,
}
# functions giving absolute dates for fuzzy dates + no date
FUNCS = {
NOW: lambda: datetime.date.today(),
SOON: lambda: datetime.date.today() + datetime.timedelta(15),
SOMEDAY: lambda: datetime.date.max,
NODATE: lambda: datetime.date.max - datetime.timedelta(1),
}
# ISO 8601 date format
ISODATE = '%Y-%m-%d'
def convert_datetime_to_date(dt):
return datetime.date(dt.year, dt.month, dt.day)
class Date(object):
"""A date class that supports fuzzy dates.
Date supports all the methods of the standard datetime.date class. A Date
can be constructed with:
* the fuzzy strings 'now', 'soon', '' (no date, default), or 'someday'
* a string containing an ISO format date: YYYY-MM-DD, or
* a datetime.date or Date instance.
"""
_real_date = None
_fuzzy = None
def __init__(self, value=''):
if value is None:
self.__init__(NODATE)
elif isinstance(value, datetime.date):
self._real_date = value
elif isinstance(value, Date):
self._real_date = value._real_date
self._fuzzy = value._fuzzy
elif isinstance(value, str) or isinstance(value, unicode):
try:
dt = datetime.datetime.strptime(value, ISODATE).date()
self._real_date = convert_datetime_to_date(dt)
except ValueError:
# it must be a fuzzy date
try:
value = str(value.lower())
self.__init__(LOOKUP[value])
except KeyError:
raise ValueError
elif isinstance(value, int):
self._fuzzy = value
else:
raise ValueError
def _date(self):
if self.is_fuzzy():
return FUNCS[self._fuzzy]()
else:
return self._real_date
def __add__(self, other):
if isinstance(other, datetime.timedelta):
return Date(self._date() + other)
else:
raise NotImplementedError
__radd__ = __add__
def __sub__(self, other):
if hasattr(other, '_date'):
return self._date() - other._date()
else:
return self._date() - other
def __rsub__(self, other):
if hasattr(other, '_date'):
return other._date() - self._date()
else:
return other - self._date()
def __cmp__(self, other):
""" Compare with other Date instance """
if isinstance(other, Date):
c = cmp(self._date(), other._date())
# Keep fuzzy dates below normal dates
if c == 0:
if self.is_fuzzy() and not other.is_fuzzy():
return 1
elif not self.is_fuzzy() and other.is_fuzzy():
return -1
return c
elif isinstance(other, datetime.date):
return cmp(self._date(), other)
else:
raise NotImplementedError
def __str__(self):
if self._fuzzy is not None:
return STRINGS[self._fuzzy]
else:
return self._real_date.isoformat()
def __repr__(self):
return "GTG_Date(%s)" % str(self)
def xml_str(self):
""" Representation for XML - fuzzy dates are in English """
if self._fuzzy is not None:
return ENGLISH_STRINGS[self._fuzzy]
else:
return self._real_date.isoformat()
def __nonzero__(self):
return self._fuzzy != NODATE
def __getattr__(self, name):
""" Provide access to the wrapped datetime.date """
try:
return self.__dict__[name]
except KeyError:
return getattr(self._date(), name)
def is_fuzzy(self):
""" True if the Date is one of the fuzzy values """
return self._fuzzy is not None
def days_left(self):
""" Return the difference between the date and today in dates """
if self.is_fuzzy():
return None
else:
return (self._real_date - datetime.date.today()).days
@classmethod
def today(cls):
return Date(datetime.date.today())
@classmethod
def tomorrow(cls):
return Date(datetime.date.today() + timedelta(1))
@classmethod
def now(cls):
return Date(NOW)
@classmethod
def no_date(cls):
return Date(NODATE)
@classmethod
def soon(cls):
return Date(SOON)
@classmethod
def someday(cls):
return Date(SOMEDAY)
@classmethod
def parse(cls, string):
"""Return a Date corresponding to string, or None.
string may be in one of the following formats:
* YYYY/MM/DD, YYYYMMDD, MMDD
* fuzzy dates
* 'today', 'tomorrow', 'next week', 'next month' or 'next year' in
English or the system locale.
"""
# sanitize input
if string is None:
string = ''
else:
string = string.lower()
# try the default formats
try:
return Date(string)
except ValueError:
pass
result = None
today = datetime.date.today()
# accepted date formats
formats = {
'today': 0,
_('today').lower(): 0,
'tomorrow': 1,
_('tomorrow').lower(): 1,
'next week': 7,
_('next week').lower(): 7,
'next month': calendar.mdays[today.month],
_('next month').lower(): calendar.mdays[today.month],
'next year': 365 + int(calendar.isleap(today.year)),
_('next year').lower(): 365 + int(calendar.isleap(today.year)),
}
# add week day names in the current locale
for i, (english, local) in enumerate([
("Monday", _("Monday")),
("Tuesday", _("Tuesday")),
("Wednesday", _("Wednesdy")),
("Thursday", _("Thursday")),
("Friday", _("Friday")),
("Saturday", _("Saturday")),
("Sunday", _("Sunday")),
]):
offset = i - today.weekday() + 7 * int(i <= today.weekday())
formats[english.lower()] = offset
formats[local.lower()] = offset
# attempt to parse the string with known formats
for fmt in ['%Y/%m/%d', '%Y%m%d', '%m%d']:
try:
dt = datetime.datetime.strptime(string, fmt)
result = convert_datetime_to_date(dt)
if '%Y' not in fmt:
# If the day has passed, assume the next year
if result.month >= today.month and result.day >= today.day:
year = today.year
else:
year = today.year +1
result = result.replace(year=year)
except ValueError:
continue
offset = formats.get(string, None)
if result is None and offset is not None:
result = today + datetime.timedelta(offset)
if result is not None:
return Date(result)
else:
raise ValueError("Can't parse date '%s'" % string)
def to_readable_string(self):
if self._fuzzy is not None:
return STRINGS[self._fuzzy]
days_left = self.days_left()
if days_left == 0:
return _('Today')
elif days_left < 0:
abs_days = abs(days_left)
return ngettext('Yesterday', '%(days)d days ago', abs_days) % \
{'days': abs_days}
elif days_left > 0 and days_left <= 15:
return ngettext('Tomorrow', 'In %(days)d days', days_left) % \
{'days': days_left}
else:
locale_format = locale.nl_langinfo(locale.D_FMT)
if calendar.isleap(datetime.date.today().year):
year_len = 366
else:
year_len = 365
if float(days_left) / year_len < 1.0:
#if it's in less than a year, don't show the year field
locale_format = locale_format.replace('/%Y','')
locale_format = locale_format.replace('.%Y','.')
return self._real_date.strftime(locale_format)
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