Get all free times from iCal on the Command Line

get_free_times_from_ical.py

'''
Get all free times from iCal.

Requirements:
	brew install ical-buddy
	pip install py-dateutil

Notes:
	Run in terminal because it needs calendar permissions.
	This only handles hourly blocks. I.e. if 30 minutes is filled, we call the entire hour filled.
	Ignores all-day events.
'''

import subprocess
from datetime import datetime as dt
from datetime import timedelta as td
import os

# Options
WORK_HOURS = set(range(10,17+1)) # 10 am to 6 pm
DAYS_AHEAD = 7
SKIP_WEEKENDS = True
NO_MILITARY_TIME = True

# Constants
date_format = '%Y-%m-%d'
now = dt.now()
now_date = now.strftime(date_format)
def to_12(t24):
	if t24 < 12:
		return f'{t24} AM'
	elif t24 == 12:
		return f'{t24} AM'
	else:
		return f'{t24-12} PM'

# Get Free Times
print(f'My free times over the next {DAYS_AHEAD} work days:\n')
i = 0
max_days = DAYS_AHEAD
while i < max_days:
	curr_day = now + td(days=i)
	if SKIP_WEEKENDS and curr_day.weekday() >= 5:
		max_days = max_days + 1
		i = i + 1
		continue
	just_date = curr_day.strftime(date_format)
	print(curr_day.strftime(date_format + ' (%a)'))
	raw_events = subprocess.check_output(f'icalBuddy -nrd -sed --timeFormat %H -df "" -b "" -iep datetime eventsFrom:{just_date} to:{just_date}', shell=True)
	out_str = raw_events.decode("utf-8")
	nice_data = [x.split(' - ') for x in out_str.split('\n') if len(x) != 0]
	nicer_data = [[int(x[0]),int(x[1])] if x[0] != x[1] else [int(x[0]),int(x[0]) + 1] for x in nice_data]
	nicest_data = [list(range(x[0],x[1])) for x in nicer_data]
	occupied_hours = set([x for sublist in nicest_data for x in sublist])
	free_hours = WORK_HOURS if len(occupied_hours) == 0 else WORK_HOURS - occupied_hours
	if NO_MILITARY_TIME:
		free_hours = [to_12(x) for x in sorted(free_hours)]
	nice_out = 'None\n' if len(free_hours) == 0 else ', '.join(free_hours) + '\n'
	print(nice_out)
	i = i + 1