omarel-mohandes / croner

Play with Cron parsing in Scala

Overview

This is a simple scala cron parser used for parsing some cron parameters and output result in a specific format.

One of tons of doc about cron

Requirements

• You'll need scala 2.13
• You'll need scalatest and scalactic for running the tests.

How to use/run

• This is sbt based project, you can import and build it in IntelliJ.

• runner is simple bash for running your build output from SBT.

• runner takes 6 parameters in this order: Minute, Hour, DayOfMonth, Month, DayOfWeek, Command.

  $ ./runner 2 3 */5 1-5 \* /lib/exec
  
  minute        2
  hour          3
  day of month  1 6 11 16 21 26
  month         1 2 3 4 5
  day of week   1 2 3 4 5 6 7
  command       /lib/exec
  

  Note: Make sure to skip the * in the terminal as shown above.

• If there is any parsing error, it will throw an IllegalArgumentException.

java.lang.IllegalArgumentException: requirement failed: Found: List(2, 3, */5, 1-5, *, /lib/exec, ds)
Please provide all 6 parameters: minute, hour, day of month, month, day of week, command

Supported use cases

• */-, and numbers are allowed in the parameters.
• Fixed months to be 30 days long.

Not Supported (yet)

• Comma separated patterns. e.g 1-5,6/10
• * in values e.g 1*-20
• Written Days patterns in the Day of the week e.g SUN,MON.
• Written Months patterns e.g JAN,FEB.
• Years parameters.
• Extra special characters like LWC#?.