krontab/README.md

# krontab

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This library was created to simplify work with from time to time things.

## How to use

There are several ways to configure and use this library:

* From some string
* From builder

Anyway, to start some action from time to time you will need to use one of extensions/functions:

```kotlin
val kronScheduler = /* creating of KronScheduler instance */;

kronScheuler.doWhile {
    // some action
    true // true - repeat on next time
}
```

### Config from string

Developers can use more simple way to configure repeat times is string. String configuring
like a `crontab`, but with a little bit different meanings:
```
/-------- Seconds
| /------ Minutes
| | /---- Hours
| | | /-- Days of months
| | | | / Months
| | | | |
* * * * *
```

It is different with original `crontab` syntax for the reason, that expected that in practice developers
will use seconds and minutes with more probability than months (for example). In fact, developers will use something
like:

```kotlin
doWhile("/5 * * * *") {
    println("Called")
    true // true - repeat on next time
}
```

Or more version:

```kotlin
doInfinity("/5 * * * *") {
    println("Called")
}
```

Both of examples will print `Called` message every five seconds.

### Config via builder

Also this library currently supports DSL for creating the same goals:

```kotlin
val kronScheduler = buildSchedule {
    seconds {
        from (0) every 5
    }
}
kronScheduler.doWhile {
    println("Called")
    true // true - repeat on next time
}
```

Or

```kotlin
val kronScheduler = buildSchedule {
    seconds {
        0 every 5
    }
}
kronScheduler.doWhile {
    println("Called")
    true // true - repeat on next time
}
```

Or

```kotlin
val kronScheduler = buildSchedule {
    seconds {
        0 every 5
    }
}
kronScheduler.doInfinity {
    println("Called")
}
```

All of these examples will do the same things: print `Called` message every five seconds.