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#!/usr/bin/env python3
"""Utilities related to dates and times and datetimes."""
import datetime
import logging
import re
from typing import NewType
import pytz
import constants
logger = logging.getLogger(__name__)
def now_pst() -> datetime.datetime:
return datetime.datetime.now(tz=pytz.timezone("US/Pacific"))
def now() -> datetime.datetime:
return datetime.datetime.now()
def datetime_to_string(
dt: datetime.datetime,
*,
date_time_separator=" ",
include_timezone=True,
include_dayname=False,
include_seconds=True,
include_fractional=False,
twelve_hour=True,
) -> str:
"""A nice way to convert a datetime into a string."""
fstring = ""
if include_dayname:
fstring += "%a/"
fstring = f"%Y/%b/%d{date_time_separator}"
if twelve_hour:
fstring += "%I:%M"
if include_seconds:
fstring += ":%S"
fstring += "%p"
else:
fstring += "%H:%M"
if include_seconds:
fstring += ":%S"
if include_fractional:
fstring += ".%f"
if include_timezone:
fstring += "%z"
return dt.strftime(fstring).strip()
def timestamp() -> str:
"""Return a timestamp for now in Pacific timezone."""
ts = datetime.datetime.now(tz=pytz.timezone("US/Pacific"))
return datetime_to_string(ts, include_timezone=True)
def time_to_string(
dt: datetime.datetime,
*,
include_seconds=True,
include_fractional=False,
include_timezone=False,
twelve_hour=True,
) -> str:
"""A nice way to convert a datetime into a time (only) string."""
fstring = ""
if twelve_hour:
fstring += "%l:%M"
if include_seconds:
fstring += ":%S"
fstring += "%p"
else:
fstring += "%H:%M"
if include_seconds:
fstring += ":%S"
if include_fractional:
fstring += ".%f"
if include_timezone:
fstring += "%z"
return dt.strftime(fstring).strip()
def seconds_to_timedelta(seconds: int) -> datetime.timedelta:
"""Convert a delta in seconds into a timedelta."""
return datetime.timedelta(seconds=seconds)
MinuteOfDay = NewType("MinuteOfDay", int)
def minute_number(hour: int, minute: int) -> MinuteOfDay:
"""Convert hour:minute into minute number from start of day."""
return MinuteOfDay(hour * 60 + minute)
def datetime_to_minute_number(dt: datetime.datetime) -> MinuteOfDay:
"""Convert a datetime into a minute number (of the day)"""
return minute_number(dt.hour, dt.minute)
def minute_number_to_time_string(minute_num: MinuteOfDay) -> str:
"""Convert minute number from start of day into hour:minute am/pm string."""
hour = minute_num // 60
minute = minute_num % 60
ampm = "a"
if hour > 12:
hour -= 12
ampm = "p"
if hour == 12:
ampm = "p"
if hour == 0:
hour = 12
return f"{hour:2}:{minute:02}{ampm}"
def parse_duration(duration: str) -> int:
"""Parse a duration in string form."""
seconds = 0
m = re.search(r'(\d+) *d[ays]*', duration)
if m is not None:
seconds += int(m.group(1)) * 60 * 60 * 24
m = re.search(r'(\d+) *h[ours]*', duration)
if m is not None:
seconds += int(m.group(1)) * 60 * 60
m = re.search(r'(\d+) *m[inutes]*', duration)
if m is not None:
seconds += int(m.group(1)) * 60
m = re.search(r'(\d+) *s[econds]*', duration)
if m is not None:
seconds += int(m.group(1))
return seconds
def describe_duration(age: int) -> str:
"""Describe a duration."""
days = divmod(age, constants.SECONDS_PER_DAY)
hours = divmod(days[1], constants.SECONDS_PER_HOUR)
minutes = divmod(hours[1], constants.SECONDS_PER_MINUTE)
descr = ""
if days[0] > 1:
descr = f"{int(days[0])} days, "
elif days[0] == 1:
descr = "1 day, "
if hours[0] > 1:
descr = descr + f"{int(hours[0])} hours, "
elif hours[0] == 1:
descr = descr + "1 hour, "
if len(descr) > 0:
descr = descr + "and "
if minutes[0] == 1:
descr = descr + "1 minute"
else:
descr = descr + f"{int(minutes[0])} minutes"
return descr
def describe_duration_briefly(age: int) -> str:
"""Describe a duration briefly."""
days = divmod(age, constants.SECONDS_PER_DAY)
hours = divmod(days[1], constants.SECONDS_PER_HOUR)
minutes = divmod(hours[1], constants.SECONDS_PER_MINUTE)
descr = ""
if days[0] > 0:
descr = f"{int(days[0])}d "
if hours[0] > 0:
descr = descr + f"{int(hours[0])}h "
descr = descr + f"{int(minutes[0])}m"
return descr
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