nathanupchurch.com/eleventy.config.js

import { DateTime } from "luxon";
import markdownIt from "markdown-it";
import markdownItFootnote from "markdown-it-footnote";
import markdownItAnchor from "markdown-it-anchor";
import mdfigcaption from "markdown-it-image-figures";
import pluginRss from "@11ty/eleventy-plugin-rss";
import pluginSyntaxHighlight from "@11ty/eleventy-plugin-syntaxhighlight";
import pluginBundle from "@11ty/eleventy-plugin-bundle";
import pluginNavigation from "@11ty/eleventy-navigation";
import prettier from "prettier";
import { EleventyHtmlBasePlugin } from "@11ty/eleventy";
import {
	dateSuffixAdder,
	monthMap,
	timeFormatter,
} from "./public/js/modules/dateTools.js";

const figoptions = {
	figcaption: true,
};

export default async function (eleventyConfig) {
	// Helper Functions
	const multiReplace = (text, replacementTable) => {
		let newText = text;
		replacementTable.forEach((x) => {
			newText = newText.replace(x[0], x[1]);
		});
		return newText;
	};

	// Collections
	eleventyConfig.addCollection("galleryImages", (collection) => {
		const galleries = collection.getAll()[0].data.galleries;
		let galleryImages = [];

		galleries.forEach((gallery) => {
			gallery.pictures.forEach((picture, i, arr) => {
				picture.containingGallery = `${gallery.title}`;
				picture.baseUrl = `${gallery.url}`;
				i ? (picture.previousImage = arr[i - 1].filename) : null;
				i + 1 != arr.length ? (picture.nextImage = arr[i + 1].filename) : null;
				galleryImages.push(picture);
			});
		});

		return galleryImages;
	});

	// Transforms
	eleventyConfig.addTransform("prettier", function (content, outputPath) {
		if (outputPath && outputPath.endsWith(".html")) {
			return prettier.format(content, {
				parser: "html",
				bracketSameLine: true,
				vueIndentScriptAndStyle: true,
				singleAttributePerLine: true,
				htmlWhitespaceSensitivity: "css",
			});
		} else {
			return content;
		}
	});

	eleventyConfig.addWatchTarget("content/**/*.{svg,webp,png,jpeg}");

	// Official plugins
	eleventyConfig.addPlugin(pluginRss);
	eleventyConfig.addPlugin(pluginSyntaxHighlight, {
		preAttributes: { tabindex: 0 },
	});
	eleventyConfig.addPlugin(pluginNavigation);
	eleventyConfig.addPlugin(EleventyHtmlBasePlugin);
	eleventyConfig.addPlugin(pluginBundle);

	// Filters
	eleventyConfig.addFilter("niceDate", (date) => {
		var day = new Date(date).getUTCDate();
		var monthIndex = new Date(date).getUTCMonth();
		var year = new Date(date).getUTCFullYear();

		return `${day}${dateSuffixAdder(day)} of ${monthMap[monthIndex]}, ${year}`;
	});

	eleventyConfig.addFilter("htmlDateString", (dateObj) => {
		// dateObj input: https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string
		return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy-LL-dd");
	});

	eleventyConfig.addFilter("removeMostRecent", (arr) => {
		return arr.slice(0, arr.length - 1);
	});

	// Shortcodes

	// Cowsay
	eleventyConfig.addFilter("cowsay", (cowText) => {
		const cowCaptionReplacementTable = [
			[
				`
					o   ^__^
					 o  (oo)\\_______
							(__)\\       )\\/\\
									||----w |
									||     ||`,
				"",
			],
			[/\(\s+/g, ""],
			[/\s+\(/g, ""],
			[/_{3,}/g, ""],
			[/-{3,}/g, ""],
			[/\s\)/g, ""],
			[/\n/g, ""],
			[/\s{2,}/g, " "],
			[/^ /, ""],
		];

		return `
<figure>
  <pre class="language-" role="img" aria-label="ASCII COW">${cowText}</pre>
  <figcaption id="cow-caption">
    A cow thinking: <em>${multiReplace(cowText, cowCaptionReplacementTable)}</em>. The cow is illustrated using
    preformatted text characters.
  </figcaption>
</figure>
			`;
	});

	// Embed a toot
	eleventyConfig.addAsyncShortcode("toot", async function (instance, ID) {
		const tootData = await fetch(`https://${instance}/api/v1/statuses/${ID}`);

		const toot = await tootData.json();

		const dateObj = new Date(toot.created_at);

		const dateTime = `${dateObj.getDate()}${dateSuffixAdder(dateObj.getDate())} of ${monthMap[dateObj.getMonth()]}, ${dateObj.getFullYear()}, at ${timeFormatter(dateObj.getHours(), dateObj.getMinutes())}`;

		return `
		<wc-toot
		author_name="${toot.account.display_name}"
		author_url="${toot.url.replace(/\/[0-9]+/, "")}"
		author_username="${toot.account.username}"
		avatar_url="${toot.account.avatar_static}"
		toot_content="${toot.content}"
		toot_url="${toot.url}"
		publish_date="${dateTime}"
		sharp_corner="">
		</wc-toot>
		`;
	});

	// Embed audio
	eleventyConfig.addShortcode(
		"audio",
		function (title, artist, media_url, cover_url) {
			return `
		<wc-card>
			<wc-mplayer
			title="${title}"
			artist="${artist}"
			media_url="${media_url}"
			cover_url="${cover_url}"
			/>
		</wc-card>
		`;
		},
	);

	// Passthrough

	eleventyConfig.addPassthroughCopy({ "./public/": "/" });

	// Get the first `n` elements of a collection.
	eleventyConfig.addFilter("head", (array, n) => {
		if (!Array.isArray(array) || array.length === 0) {
			return [];
		}
		if (n < 0) {
			return array.slice(n);
		}

		return array.slice(0, n);
	});

	// Return the smallest number argument
	eleventyConfig.addFilter("min", (...numbers) => {
		return Math.min.apply(null, numbers);
	});

	// Return all the tags used in a collection
	eleventyConfig.addFilter("getAllTags", (collection) => {
		let tagSet = new Set();
		for (let item of collection) {
			(item.data.tags || []).forEach((tag) => tagSet.add(tag));
		}
		return Array.from(tagSet);
	});

	eleventyConfig.addFilter("filterTagList", function filterTagList(tags) {
		return (tags || []).filter(
			(tag) =>
				["all", "nav", "post", "posts", "gallery", "quiz"].indexOf(tag) === -1,
		);
	});

	// Customize Markdown library settings:
	let markdownItOptions = {
		html: true,
		typographer: true,
	};

	let mdLib = markdownIt(markdownItOptions);

	eleventyConfig.amendLibrary("md", (mdLib) => {
		mdLib
			.use(markdownItAnchor, {
				permalink: markdownItAnchor.permalink.ariaHidden({
					placement: "after",
					class: "header-anchor",
					symbol: "#",
					ariaHidden: false,
				}),
				level: [1, 2, 3, 4],
				slugify: eleventyConfig.getFilter("slugify"),
			})
			.use(markdownItFootnote)
			.use(mdfigcaption, figoptions);
	});

	eleventyConfig.setLibrary("md", mdLib);

	return {
		templateFormats: ["md", "njk", "html", "liquid"],

		markdownTemplateEngine: "njk",

		htmlTemplateEngine: "njk",

		dir: {
			input: "content", // default: "."
			includes: "../_includes", // default: "_includes"
			data: "../_data", // default: "_data"
			output: "_site",
		},
		pathPrefix: "/",
	};
}