permafrost-dev / codeboost

/* It initializes a git instance */

import { LogTarget } from '@/traits/HasLogger';

export interface AppSettings {

    github_token: string;

    repository_storage_path: string;

    boosts_path: string;

    use_forks: boolean;

    use_pull_requests: boolean;

    log_target: LogTarget | LogTarget[];

    dry_run?: boolean;

    auto_merge_pull_requests?: boolean;

}

export function loadSettings(filename: string): AppSettings {

    return transformSettings(require(filename).default);

}

function loadLogTarget(settings) {

    if (!Array.isArray(settings.log_target)) {

        settings.log_target = [ settings.log_target ];

    }

    settings.log_target = settings.log_target

        .map(target => <LogTarget>target.toLowerCase())

        .filter((target: string) => [ 'console', 'file' ].includes(target));

    return settings;

}

const isString = (value: any) => typeof value === 'string';

const isUndefined = (value: any) => typeof value === 'undefined';

const getEnvVar = (settings, key: string) => process.env[settings[key].slice(1)];

const setDefaultValue = (settings, key: string, value: any) => isUndefined(settings[key]) && (settings[key] = value);

export function transformSettings(settings: AppSettings): AppSettings {

    // load settings from environment variable references starting with '$'

    Object.keys(settings)

        .filter(key => isString(settings[key]) && !!getEnvVar(settings, key))

        .forEach(key => (settings[key] = getEnvVar(settings, key)));

    setDefaultValue(settings, 'dry_run', false);

    setDefaultValue(settings, 'auto_merge_pull_requests', false);

    settings.use_forks = settings.use_pull_requests ? settings.use_forks : false;

    return loadLogTarget(settings);

}