I've made some mods to the origina cron repository. Most notably, i've added "seconds" resolution. Would it be nice to add micros? Probably yes.

make

This simple example takes a "microsecond delay" and a "cron string" as arguments. It then sleeps for the microsecond delay and prints "ping" if the current time matches the schedule represented by the cron string.

./.cabal-sandbox/bin/ping 1000000 "*/2 * * * * *"

 parseOnly cronSchedule "*/2 * 3 * 4,5,6"
 parseOnly cronScheduleLoose "*/2 * 3 * 4,5,6"
 parseOnly cronScheduleLooseGranular "* */2 * 3 * 4,5,6"

Cover my modifications via the already-existing test suite/hspec.

Cron data structure and Attoparsec parser for Haskell. The idea is to embed it in larger systems which want to roll their own scheduled tasks in a format that people are used to.

System.Cron is where all the interesting datatypes live. You will also find scheduleMatches, which you can use to compare a time against a CronSchedule to see if an action needs to be performed. System.Cron.Parser is where you will find the parsers cronSchedule, crontabEntry and cronTab. To parse individual schedules up to full crontab files.

To do anything, you'll need to install cabal-dev with cabal.

To build, run:

make

To run tests, run:

make test

If you have inotify-tools, run this to run tests continuously.

make autotest

To generate docs:

make docs

• Simon Hengel
• Alberto Valverde