.eleventy.common-config.js

module.exports = {
	common: (e) => {
		const markdownIt = require('markdown-it');
		const markdown = markdownIt({
			html: true,
			breaks: true,
			linkify: false,
		});

		//#region adapted from https://github.com/markdown-it/markdown-it/blob/bda94b0521f206a02427ec58cb9a848d9c993ccb/docs/architecture.md#renderer

		const defaultRender = markdown.renderer.rules.link_open || function(
			tokens,
			idx,
			options,
			env,
			self
		) {
			return self.renderToken(tokens, idx, options);
		};

		markdown.renderer.rules.link_open = (tokens, idx, options, env, self) => {
			// If you are sure other plugins can't add `target` - drop check below
			const target = tokens[idx].attrIndex('target');
			const rel = tokens[idx].attrIndex('rel');

			if (target < 0) {
				// add new attribute
				tokens[idx].attrPush(['target', '_blank']);
			} else {
				// replace value of existing attr
				tokens[idx].attrs[target][1] = '_blank';
			}

			if (rel < 0) {
				tokens[idx].attrPush(['rel', 'noopener']);
			} else {
				throw new Error('Unsupported modification needed here');
			}

			// pass token to default renderer.
			return defaultRender(tokens, idx, options, env, self);
		};

		//#endregion

		e.setLibrary('md', markdown);

		e.addFilter('json', (value) => {
			return JSON.stringify(value, null, "\t");
		});

		e.addFilter('jsonld_description', (value) => {
			let maybe = value.find((e) => {
				return 'description' in e;
			});

			if (maybe) {
				return maybe.description;
			}

			maybe = value.find((e) => {
				return (
					('@type' in e)
					&& ['Person', 'Article'].includes(e['@type'])
					&& ('name' in e)
				);
			});

			if (maybe) {
				return `Satisfactory Lviestream clips about ${maybe.name}.`;
			}

			return 'Serves as an unofficial archive for Clips for Coffee Stain Studio\'s Satisfactory-related livestreams';
		});

		e.addFilter('markdown_blockquote', (value) => {
			return markdown.render(value.map((e) => {
				return `> ${e}`.trim() + "\n" + '>';
			}).join("\n"));
		});

		e.addFilter('markdownify', (value) => {
			return markdown.render(value);
		});

		e.addFilter('timestampify', (description, url) => {
			if ( ! /^https:\/\/youtu\.be\/[^,\?]+$/.test(url)) {
				return description;
			}

			return description.replaceAll(/((?:\d*:)?\d+:\d+) ([^\n]+)(\n)?/g, (
				_line,
				timestamp,
				text,
				newline
			) => {
				const [seconds, minutes, hours] = timestamp.split(':').reverse();

				return `<a href="${
					url
				}?t=${
					(parseInt(hours || 0) * 3600) + parseInt((minutes || 0) * 60) + parseInt(seconds || 0)
				}" rel="noopener" target="_blank">${
					timestamp
				}</a> ${
					text
				}${newline || ''}`;
			})
		});
	},
};