The isittime script accepts rules on stdin or passed as filename. See the
examples file to get an idea for the format. The script is intended to be used
as part of a logic chain such as
echo "mon-thu 19:00-21:00" | isittime && open-lock || close-lock
I'm using this script to drive a door lock from cron:
* * * * * root /usr/bin/isittime /etc/opening-hours && /sbin/open-lock || /sbin/close-lock
Make sure system time and timezone are set correctly before relying on this script.
isittime uses a simple schedule format to specify dates, weekdays and times
of day. Example: mon-wed 13:00-18:00 matches all days between 13:00 and 18:00
except weekends.
The format allows multiple lines, one rule per line. Every rule can have
multiple patterns specified. Each pattern may be a single time-specifier such
as a date (2016.09.08), a weekday (mon), or a time (13:00). A pattern may
also be a range giving two values such as 2016.09.01-2016.10.31, sat-sun, or
08:00-13:00.
For a rule to match, at least one of the patterns of each class must match, if it is specified. So if dates are specified, at least one of the dates must match, if weekdays are specfied, one must match, same for daytime. Everything following the pound sign (#) on a line is ignored. Empty lines are ignored. Lines that don't follow the format are ignored and a warning is printed to stderr.
Copyright 2016 sbalmer
This program is free software: you can redistribute it and/or modify it under the terms of the GNU 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 General Public License for more details.