cron-with-randomness

Extended cron shorthand to randomly select value from given interval. In addition to standard expression supported by crate cron, this crate supports following shorthands.

• @daily{h=9-17} means run once between 9 am and 5 pm chosen randomly.
• @daily{h=9-12,h=15-20} means run once between 9 am and 12 pm or between 3 pm and 8 pm.

Similarly one can pass daily constraints to @weekly.

• @weekly{d=1-5} means run once per week between day 1 and day 5.
• @weekly{d=1-5,h=9-12} run once per week between day 1 and day 5 and between 9 am and 12 pm.
• @weekly{h=9-12} runs once per week on any day chosen randomly and between 9 am and 12 pm.

Examples

@daily

$ cargo run -- @daily{h=9-17}

 --> 2023-12-18T13:17:00Z
 --> 2023-12-19T09:52:00Z
 --> 2023-12-20T13:12:00Z
 --> 2023-12-21T16:44:00Z
 --> 2023-12-22T09:09:00Z
 --> 2023-12-23T09:37:00Z
 --> 2023-12-24T16:55:00Z
 --> 2023-12-25T12:28:00Z
 --> 2023-12-26T16:36:00Z
 --> 2023-12-27T10:35:00Z

@weekly

$ cargo run -- @weekly{h=0-2}

 --> 2023-12-24T00:16:00Z
 --> 2023-12-31T00:06:00Z
 --> 2024-01-07T00:28:00Z
 --> 2024-01-14T00:24:00Z
 --> 2024-01-21T00:43:00Z
 --> 2024-01-28T00:33:00Z
 --> 2024-02-04T01:20:00Z
 --> 2024-02-11T00:28:00Z
 --> 2024-02-18T00:04:00Z
 --> 2024-02-25T01:22:00Z

$ cargo run -- '@weekly{d=1-4,h=0-2}'
 --> 2023-12-25T01:51:00Z
 --> 2024-01-03T01:02:00Z
 --> 2024-01-09T00:27:00Z
 --> 2024-01-15T01:10:00Z
 --> 2024-01-24T01:10:00Z
 --> 2024-01-30T00:53:00Z
 --> 2024-02-07T00:31:00Z
 --> 2024-02-13T00:18:00Z
 --> 2024-02-19T00:35:00Z
 --> 2024-02-26T01:16:00Z