Cron Trigger

[scls19fr]

A trigger which support cron syntax could be a nice feature to have

Usage:

sched = BlockingScheduler()

# Define what action will be executed
action = Action(print_time_kwargs; Dict(:a=>"keyword")...)

# Define when job should be triggered
trigger = Trigger(Cron("45 23 * * 6"))  # execute according a cron syntax (at 23:45 (11:45 PM) every Saturday. in this specific case)
# or
# trigger = CronTrigger("45 23 * * 6")

add(sched, action, trigger)

# Run scheduler
run(sched)

Maybe a standalone package only responsible of parsing a cron syntax could be created and ExtensibleScheduler could depend on such a package if it provides a stable API.
See CronParser.jl

tonext(Cron("45 23 * * 6"), DateTime(2018,1,18,0,0)))

should return for example DateTime(2018,1,20,23,45)