it-tools/src/tools/list-converter/list-converter.models.ts

import _ from 'lodash';
import { byOrder } from '@/utils/array';
import type { ConvertOptions } from './list-converter.types';

export { convert };

const whenever =
  <T, R>(condition: boolean, fn: (value: T) => R) =>
  (value: T) =>
    condition ? fn(value) : value;

function convert(list: string, options: ConvertOptions): string {
  const lineBreak = options.keepLineBreaks ? '\n' : '';

  return _.chain(list)
    .thru(whenever(options.lowerCase, (text) => text.toLowerCase()))
    .split('\n')
    .thru(whenever(options.removeDuplicates, _.uniq))
    .thru(whenever(options.reverseList, _.reverse))
    .thru(whenever(!_.isNull(options.sortList), (parts) => parts.sort(byOrder({ order: options.sortList }))))
    .map(whenever(options.trimItems, _.trim))
    .without('')
    .map((p) => options.itemPrefix + p + options.itemSuffix)
    .join(options.separator + lineBreak)
    .thru((text) => [options.listPrefix, text, options.listSuffix].join(lineBreak))
    .value();
}