Builder API for creating the CLI

[dblevins]

Builders can be used to construct the exact environment needed.

For example:

import org.tomitribe.crest.Main;

public class Example {

    public static void main(String[] args) {
        final Main main = Main.builder()
                .properties(System.getProperties())
                .env(System.getenv())
                .out(System.out)
                .err(System.err)
                .in(System.in)
                .exit(System::exit)
                .command(PizzaCommands.class)
                .command(SandwichCommands.class)
                .build();

        main.run(args);
    }
}

The above can be reduced further using the following convenience builder method that defaults most the above:

import org.tomitribe.crest.Main;

public class Example {

    public static void main(String[] args) {
        final Main main = Main.systemDefaults()
                .command(PizzaCommands.class)
                .command(SandwichCommands.class)
                .build();

        main.run(args);
    }
}