summaly/src/utils/cleanup-title.ts

/* eslint-disable no-param-reassign */
import escapeRegExp from 'escape-regexp';

export function cleanupTitle(title: string, siteName?: string | null): string {
	title = title.trim();

	if (siteName) {
		siteName = siteName.trim();

		const x = escapeRegExp(siteName);

		const patterns = [
			`^(.+?)\\s?[\\-\\|:・]\\s?${x}$`,
		];

		for (let i = 0; i < patterns.length; i++) {
			const pattern = new RegExp(patterns[i]);
			const [, match] = pattern.exec(title) ?? [null, null];
			if (match) {
				return match;
			}
		}
	}

	return title;
}