102 lines
3.5 KiB
Python
102 lines
3.5 KiB
Python
import calendar
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import datetime
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from django.utils.html import avoid_wrapping
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from django.utils.timezone import is_aware, utc
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from django.utils.translation import gettext, ngettext_lazy
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TIME_STRINGS = {
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"year": ngettext_lazy("%(num)d year", "%(num)d years", "num"),
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"month": ngettext_lazy("%(num)d month", "%(num)d months", "num"),
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"week": ngettext_lazy("%(num)d week", "%(num)d weeks", "num"),
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"day": ngettext_lazy("%(num)d day", "%(num)d days", "num"),
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"hour": ngettext_lazy("%(num)d hour", "%(num)d hours", "num"),
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"minute": ngettext_lazy("%(num)d minute", "%(num)d minutes", "num"),
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}
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TIMESINCE_CHUNKS = (
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(60 * 60 * 24 * 365, "year"),
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(60 * 60 * 24 * 30, "month"),
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(60 * 60 * 24 * 7, "week"),
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(60 * 60 * 24, "day"),
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(60 * 60, "hour"),
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(60, "minute"),
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)
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def timesince(d, now=None, reversed=False, time_strings=None, depth=2):
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"""
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Take two datetime objects and return the time between d and now as a nicely
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formatted string, e.g. "10 minutes". If d occurs after now, return
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"0 minutes".
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Units used are years, months, weeks, days, hours, and minutes.
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Seconds and microseconds are ignored. Up to `depth` adjacent units will be
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displayed. For example, "2 weeks, 3 days" and "1 year, 3 months" are
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possible outputs, but "2 weeks, 3 hours" and "1 year, 5 days" are not.
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`time_strings` is an optional dict of strings to replace the default
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TIME_STRINGS dict.
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`depth` is an optional integer to control the number of adjacent time
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units returned.
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Adapted from
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https://web.archive.org/web/20060617175230/http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
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"""
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if time_strings is None:
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time_strings = TIME_STRINGS
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if depth <= 0:
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raise ValueError("depth must be greater than 0.")
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# Convert datetime.date to datetime.datetime for comparison.
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if not isinstance(d, datetime.datetime):
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d = datetime.datetime(d.year, d.month, d.day)
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if now and not isinstance(now, datetime.datetime):
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now = datetime.datetime(now.year, now.month, now.day)
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now = now or datetime.datetime.now(utc if is_aware(d) else None)
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if reversed:
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d, now = now, d
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delta = now - d
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# Deal with leapyears by subtracing the number of leapdays
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leapdays = calendar.leapdays(d.year, now.year)
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if leapdays != 0:
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if calendar.isleap(d.year):
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leapdays -= 1
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elif calendar.isleap(now.year):
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leapdays += 1
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delta -= datetime.timedelta(leapdays)
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# ignore microseconds
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since = delta.days * 24 * 60 * 60 + delta.seconds
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if since <= 0:
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# d is in the future compared to now, stop processing.
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return avoid_wrapping(time_strings["minute"] % {"num": 0})
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for i, (seconds, name) in enumerate(TIMESINCE_CHUNKS):
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count = since // seconds
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if count != 0:
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break
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else:
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return avoid_wrapping(time_strings["minute"] % {"num": 0})
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result = []
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current_depth = 0
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while i < len(TIMESINCE_CHUNKS) and current_depth < depth:
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seconds, name = TIMESINCE_CHUNKS[i]
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count = since // seconds
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if count == 0:
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break
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result.append(avoid_wrapping(time_strings[name] % {"num": count}))
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since -= seconds * count
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current_depth += 1
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i += 1
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return gettext(", ").join(result)
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def timeuntil(d, now=None, time_strings=None, depth=2):
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"""
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Like timesince, but return a string measuring the time until the given time.
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"""
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return timesince(d, now, reversed=True, time_strings=time_strings, depth=depth)
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