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annotate sat/tools/common/date_utils.py @ 2757:1f612547fb2e

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author Goffi <goffi@goffi.org>
date Sat, 05 Jan 2019 14:15:11 +0100
parents 3ba53b1cd1e6
children 003b8b4b56a7
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2018 Jérôme Poisson (goffi@goffi.org)
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6
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7 # This program is free software: you can redistribute it and/or modify
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8 # it under the terms of the GNU Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 of the License, or
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10 # (at your option) any later version.
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11
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12 # This program is distributed in the hope that it will be useful,
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13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 # GNU Affero General Public License for more details.
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16
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17 # You should have received a copy of the GNU Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """tools to help manipulating time and dates"""
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21
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22 from sat.core.constants import Const as C
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23 from sat.core.i18n import _
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24 import datetime
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25 import dateutil
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26 from dateutil import tz
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27 from dateutil.relativedelta import relativedelta
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28 from dateutil.utils import default_tzinfo
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29 from babel import dates
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30 import calendar
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31 import time
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32 import re
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33
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34 RELATIVE_RE = re.compile(ur"(?P<date>.*?)(?P<direction>[-+]?) *(?P<quantity>\d+) *"
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35 ur"(?P<unit>(second|minute|hour|day|week|month|year))s?"
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36 ur"(?P<ago> +ago)?", re.I)
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37
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38 TZ_UTC = tz.tzutc()
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39 TZ_LOCAL = tz.gettz()
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40
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41
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42 def date_parse(value, default_tz=TZ_UTC):
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43 """Parse a date and return corresponding unix timestamp
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44
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45 @param value(unicode): date to parse, in any format supported by dateutil.parser
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46 @param default_tz(datetime.tzinfo): default timezone
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47 @return (int): timestamp
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48 """
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49 dt = default_tzinfo(dateutil.parser.parse(unicode(value), dayfirst=True), default_tz)
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50 return calendar.timegm(dt.utctimetuple())
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51
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52 def date_parse_ext(value, default_tz=TZ_UTC):
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53 """Extended date parse which accept relative date
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54
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55 @param value(unicode): date to parse, in any format supported by dateutil.parser
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56 and with the hability to specify X days/weeks/months/years in the past or future.
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57 Relative date are specified either with something like `[main_date] +1 week`
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58 or with something like `3 days ago`, and it is case insensitive. [main_date] is
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59 a date parsable by dateutil.parser, or empty to specify current date/time.
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60 "now" can also be used to specify current date/time.
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61 @param default_tz(datetime.tzinfo): same as for date_parse
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62 @return (int): timestamp
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63 """
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64 m = RELATIVE_RE.match(value)
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65 if m is None:
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66 return date_parse(value, default_tz=default_tz)
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67
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68 if m.group(u"direction") and m.group(u"ago"):
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69 raise ValueError(
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70 _(u"You can't use a direction (+ or -) and \"ago\" at the same time"))
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71
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72 if m.group(u"direction") == u'-' or m.group(u"ago"):
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73 direction = -1
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74 else:
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75 direction = 1
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76
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77 date = m.group(u"date").strip().lower()
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78 if not date or date == u"now":
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79 dt = datetime.datetime.now(tz.tzutc())
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80 else:
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81 dt = default_tzinfo(dateutil.parser.parse(date, dayfirst=True))
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82
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83 quantity = int(m.group(u"quantity"))
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84 key = m.group(u"unit").lower() + u"s"
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85 delta_kw = {key: direction * quantity}
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86 dt = dt + relativedelta(**delta_kw)
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87 return calendar.timegm(dt.utctimetuple())
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88
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89
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90 def date_fmt(timestamp, fmt="short", date_only=False, auto_limit=7, auto_old_fmt="short",
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91 auto_new_fmt="relative", locale_str=C.DEFAULT_LOCALE, tz_info=TZ_UTC):
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92 """format date according to locale
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93
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94 @param timestamp(basestring, float): unix time
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95 @param fmt(str): one of:
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96 - short: e.g. u'31/12/17'
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97 - medium: e.g. u'Apr 1, 2007'
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98 - long: e.g. u'April 1, 2007'
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99 - full: e.g. u'Sunday, April 1, 2007'
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100 - relative: format in relative time
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101 e.g.: 3 hours
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102 note that this format is not precise
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103 - iso: ISO 8601 format
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104 e.g.: u'2007-04-01T19:53:23Z'
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105 - auto: use auto_old_fmt if date is older than auto_limit
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106 else use auto_new_fmt
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107 - auto_day: shorcut to set auto format with change on day
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108 old format will be short, and new format will be time only
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109 or a free value which is passed to babel.dates.format_datetime
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110 (see http://babel.pocoo.org/en/latest/dates.html?highlight=pattern#pattern-syntax)
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111 @param date_only(bool): if True, only display date (not datetime)
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112 @param auto_limit (int): limit in days before using auto_old_fmt
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113 use 0 to have a limit at last midnight (day change)
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114 @param auto_old_fmt(unicode): format to use when date is older than limit
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115 @param auto_new_fmt(unicode): format to use when date is equal to or more recent
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116 than limit
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117 @param locale_str(unicode): locale to use (as understood by babel)
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118 @param tz_info(datetime.tzinfo): time zone to use
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119
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120 """
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121 timestamp = float(timestamp)
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122 if fmt == "auto_day":
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123 fmt, auto_limit, auto_old_fmt, auto_new_fmt = "auto", 0, "short", "HH:mm"
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124 if fmt == "auto":
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125 if auto_limit == 0:
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126 now = datetime.datetime.now(tz_info)
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127 # we want to use given tz_info, so we don't use date() or today()
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128 today = datetime.datetime(year=now.year, month=now.month, day=now.day,
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129 tzinfo=now.tzinfo)
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130 today = calendar.timegm(today.utctimetuple())
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131 if timestamp < today:
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132 fmt = auto_old_fmt
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133 else:
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134 fmt = auto_new_fmt
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135 else:
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136 days_delta = (time.time() - timestamp) / 3600
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137 if days_delta > (auto_limit or 7):
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138 fmt = auto_old_fmt
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139 else:
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140 fmt = auto_new_fmt
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141
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142 if fmt == "relative":
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143 delta = timestamp - time.time()
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144 return dates.format_timedelta(
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145 delta, granularity="minute", add_direction=True, locale=locale_str
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146 )
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147 elif fmt in ("short", "long"):
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148 if date_only:
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149 dt = datetime.fromtimestamp(timestamp, tz_info)
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150 return dates.format_date(dt, format=fmt, locale=locale_str)
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151 else:
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152 return dates.format_datetime(timestamp, format=fmt, locale=locale_str,
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153 tzinfo=tz_info)
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154 elif fmt == "iso":
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155 if date_only:
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156 fmt = "yyyy-MM-dd"
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157 else:
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158 fmt = "yyyy-MM-ddTHH:mm:ss'Z'"
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159 return dates.format_datetime(timestamp, format=fmt)
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160 else:
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161 return dates.format_datetime(timestamp, format=fmt, locale=locale_str,
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162 tzinfo=tz_info)