Mercurial > libervia-backend
view sat/tools/common/date_utils.py @ 3144:02325c3141dd
core (constants): parse `sat.conf` from `sat` module dir
author | Goffi <goffi@goffi.org> |
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date | Wed, 29 Jan 2020 19:05:41 +0100 |
parents | 559a625a236b |
children | be6d91572633 |
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#!/usr/bin/env python3 # SAT: a jabber client # Copyright (C) 2009-2020 Jérôme Poisson (goffi@goffi.org) # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero 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 Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. """tools to help manipulating time and dates""" from sat.core.constants import Const as C from sat.core.i18n import _ import datetime from dateutil import tz, parser from dateutil.relativedelta import relativedelta from dateutil.utils import default_tzinfo from babel import dates import calendar import time import re RELATIVE_RE = re.compile(r"(?P<date>.*?)(?P<direction>[-+]?) *(?P<quantity>\d+) *" r"(?P<unit>(second|minute|hour|day|week|month|year))s?" r"(?P<ago> +ago)?", re.I) YEAR_FIRST_RE = re.compile(r"\d{4}[^\d]+") TZ_UTC = tz.tzutc() TZ_LOCAL = tz.gettz() # used to replace values when something is missing DEFAULT_DATETIME = datetime.datetime(2000, 0o1, 0o1) def date_parse(value, default_tz=TZ_UTC): """Parse a date and return corresponding unix timestamp @param value(unicode): date to parse, in any format supported by parser @param default_tz(datetime.tzinfo): default timezone @return (int): timestamp """ value = str(value).strip() dayfirst = False if YEAR_FIRST_RE.match(value) else True dt = default_tzinfo( parser.parse(value, default=DEFAULT_DATETIME, dayfirst=dayfirst), default_tz) return calendar.timegm(dt.utctimetuple()) def date_parse_ext(value, default_tz=TZ_UTC): """Extended date parse which accept relative date @param value(unicode): date to parse, in any format supported by parser and with the hability to specify X days/weeks/months/years in the past or future. Relative date are specified either with something like `[main_date] +1 week` or with something like `3 days ago`, and it is case insensitive. [main_date] is a date parsable by parser, or empty to specify current date/time. "now" can also be used to specify current date/time. @param default_tz(datetime.tzinfo): same as for date_parse @return (int): timestamp """ m = RELATIVE_RE.match(value) if m is None: return date_parse(value, default_tz=default_tz) if m.group("direction") and m.group("ago"): raise ValueError( _("You can't use a direction (+ or -) and \"ago\" at the same time")) if m.group("direction") == '-' or m.group("ago"): direction = -1 else: direction = 1 date = m.group("date").strip().lower() if not date or date == "now": dt = datetime.datetime.now(tz.tzutc()) else: dt = default_tzinfo(parser.parse(date, dayfirst=True)) quantity = int(m.group("quantity")) key = m.group("unit").lower() + "s" delta_kw = {key: direction * quantity} dt = dt + relativedelta(**delta_kw) return calendar.timegm(dt.utctimetuple()) def date_fmt(timestamp, fmt="short", date_only=False, auto_limit=7, auto_old_fmt="short", auto_new_fmt="relative", locale_str=C.DEFAULT_LOCALE, tz_info=TZ_UTC): """format date according to locale @param timestamp(basestring, float): unix time @param fmt(str): one of: - short: e.g. u'31/12/17' - medium: e.g. u'Apr 1, 2007' - long: e.g. u'April 1, 2007' - full: e.g. u'Sunday, April 1, 2007' - relative: format in relative time e.g.: 3 hours note that this format is not precise - iso: ISO 8601 format e.g.: u'2007-04-01T19:53:23Z' - auto: use auto_old_fmt if date is older than auto_limit else use auto_new_fmt - auto_day: shorcut to set auto format with change on day old format will be short, and new format will be time only or a free value which is passed to babel.dates.format_datetime (see http://babel.pocoo.org/en/latest/dates.html?highlight=pattern#pattern-syntax) @param date_only(bool): if True, only display date (not datetime) @param auto_limit (int): limit in days before using auto_old_fmt use 0 to have a limit at last midnight (day change) @param auto_old_fmt(unicode): format to use when date is older than limit @param auto_new_fmt(unicode): format to use when date is equal to or more recent than limit @param locale_str(unicode): locale to use (as understood by babel) @param tz_info(datetime.tzinfo): time zone to use """ timestamp = float(timestamp) if fmt == "auto_day": fmt, auto_limit, auto_old_fmt, auto_new_fmt = "auto", 0, "short", "HH:mm" if fmt == "auto": if auto_limit == 0: now = datetime.datetime.now(tz_info) # we want to use given tz_info, so we don't use date() or today() today = datetime.datetime(year=now.year, month=now.month, day=now.day, tzinfo=now.tzinfo) today = calendar.timegm(today.utctimetuple()) if timestamp < today: fmt = auto_old_fmt else: fmt = auto_new_fmt else: days_delta = (time.time() - timestamp) / 3600 if days_delta > (auto_limit or 7): fmt = auto_old_fmt else: fmt = auto_new_fmt if fmt == "relative": delta = timestamp - time.time() return dates.format_timedelta( delta, granularity="minute", add_direction=True, locale=locale_str ) elif fmt in ("short", "long"): if date_only: dt = datetime.fromtimestamp(timestamp, tz_info) return dates.format_date(dt, format=fmt, locale=locale_str) else: return dates.format_datetime(timestamp, format=fmt, locale=locale_str, tzinfo=tz_info) elif fmt == "iso": if date_only: fmt = "yyyy-MM-dd" else: fmt = "yyyy-MM-ddTHH:mm:ss'Z'" return dates.format_datetime(timestamp, format=fmt) else: return dates.format_datetime(timestamp, format=fmt, locale=locale_str, tzinfo=tz_info)