console-app/lib/Options/BaseOption.ts

/*
 * Copyright (C) Sapphirecode - All Rights Reserved
 * This file is part of console-app which is released under MIT.
 * See file 'LICENSE' for full license details.
 * Created by Timo Hocker <timo@scode.ovh>, October 2020
 */

import { OptionSource } from '../Sources/OptionSource';
import { Option, OptionValue } from '../Option';
import { EnvSource } from '../Sources/EnvSource';
import { ArgSource } from '../Sources/ArgSource';
import { ConfigSource } from '../Sources/ConfigSource';
import { TypeValidation } from '../TypeValidation/TypeValidation';
import { InteractiveSource } from '../Sources/InteractiveSource';

export abstract class BaseOption<T> {
  protected readonly sources: OptionSource[] = [];
  private _config: Option;

  public constructor (
    config: Option
  ) {
    this._config = config;

    const sources = config.sources || {};
    const exit_on_interrupt = config.exit_on_interrupt !== false;

    if (typeof sources.configs !== 'undefined') {
      this.sources.push (new ConfigSource (
        sources.configs,
        config.error_callback
      ));
    }

    this.sources.push (new EnvSource (config.error_callback));

    if (sources.console !== false)
      this.sources.push (new ArgSource (config.error_callback));

    if (sources.interactive !== false) {
      this.sources.push (new InteractiveSource (
        exit_on_interrupt,
        config.error_callback
      ));
    }
  }

  protected abstract get validation(): TypeValidation;

  public async parse (): Promise<T> {
    const val = new OptionValue (this.validation);

    for (const source of this.sources)
      // eslint-disable-next-line no-await-in-loop
      await source.parse (this._config, val);

    if (!val.filled)
      return this._config.default as T;
    return val.value as T;
  }
}