import {
    AsyncErrorCallback,
    SimpleFunction
} from "../interfaces";

import {
    once
} from "../common";


/**
 * This method executes a loop body until an error occured.
 */
export function forever<E>(
    loopBody: SimpleFunction<E>,
    final?: AsyncErrorCallback<E>
): void {

    let loop = function(): void {

        loopBody(once(function(err?: E): void {

            if (err !== null && err !== undefined) {

                final && final(err);
            }
            else {

                loop();
            }
        }));
    };

    loop();
}