eleventy.config.js

const fs = require("fs");

const { DateTime } = require("luxon");
const markdownIt = require("markdown-it");
const markdownItAnchor = require("markdown-it-anchor");

const pluginBundle = require("@11ty/eleventy-plugin-bundle");
const pluginRss = require("@11ty/eleventy-plugin-rss");
const pluginSyntaxHighlight = require("@11ty/eleventy-plugin-syntaxhighlight");
const pluginNavigation = require("@11ty/eleventy-navigation");

module.exports = function (eleventyConfig) {
  eleventyConfig.addPassthroughCopy("images");
  eleventyConfig.addPassthroughCopy("fonts");
  eleventyConfig.addPassthroughCopy({ "public/robots.txt": "/robots.txt" });

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

  eleventyConfig.addPlugin(pluginRss);
  eleventyConfig.addPlugin(pluginSyntaxHighlight);
  eleventyConfig.addPlugin(pluginNavigation);
  eleventyConfig.addPlugin(pluginBundle);

  eleventyConfig.addFilter("readableDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat(
      "dd LLL yyyy",
    );
  });

  eleventyConfig.addFilter("projectsDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy");
  });

  eleventyConfig.addFilter("fullDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat(
      "MMMM d, yyyy",
    );
  });

  eleventyConfig.addFilter("yearDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("yyyy");
  });

  eleventyConfig.addFilter("shortDate", (dateObj) => {
    return DateTime.fromJSDate(dateObj, { zone: "utc" }).toFormat("MM/dd/yyyy");
  });

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

  // 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);
  });

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

  eleventyConfig.addFilter("filterTagList", filterTagList);

  eleventyConfig.addCollection("notes", function (collection) {
    return collection.getFilteredByGlob("notes/*.md");
  });

  eleventyConfig.addCollection("stories", function (collection) {
    return collection.getFilteredByGlob("stories/*.md");
  });

  eleventyConfig.addCollection("featured", function (collection) {
    return collection.getAll().filter(function (item) {
      return "featured" in (item.data.tags || []);
    });
  });

  eleventyConfig.addCollection("newsletter", function (collection) {
    return collection.getFilteredByGlob("newsletter/*.md");
  });

  eleventyConfig.addCollection("adventures", function (collection) {
    return collection.getFilteredByGlob("adventures/*.md");
  });

  eleventyConfig.addCollection("projects", function (collection) {
    return collection.getFilteredByGlob("projects/*.md");
  });

  eleventyConfig.addCollection("cascade", function (collection) {
    return collection.getFilteredByGlob("the-cascade/*.md");
  });

  // Create an array of all tags
  eleventyConfig.addCollection("tagList", function (collection) {
    let tagSet = new Set();
    collection.getAll().forEach((item) => {
      (item.data.tags || []).forEach((tag) => tagSet.add(tag));
    });

    return filterTagList([...tagSet]);
  });

  // Customize Markdown library and settings
  let markdownLibrary = markdownIt({
    html: true,
    breaks: true,
    linkify: true,
  }).use(markdownItAnchor, {
    permalink: markdownItAnchor.permalink.ariaHidden({
      placement: "after",
      class: "direct-link",
      symbol: "#",
      level: [1, 2, 3, 4],
    }),
    slugify: eleventyConfig.getFilter("slug"),
  });

  eleventyConfig.setLibrary("md", markdownLibrary);

  return {
    // Control which files Eleventy will process
    // e.g.: *.md, *.njk, *.html, *.liquid
    templateFormats: ["md", "njk", "html", "liquid"],

    // Pre-process *.md files with: (default: `liquid`)
    markdownTemplateEngine: "njk",

    // Pre-process *.html files with: (default: `liquid`)
    htmlTemplateEngine: "njk",

    // -----------------------------------------------------------------
    // If your site deploys to a subdirectory, change `pathPrefix`.
    // Don’t worry about leading and trailing slashes, we normalize these.

    // If you don’t have a subdirectory, use "" or "/" (they do the same thing)
    // This is only used for link URLs (it does not affect your file structure)
    // Best paired with the `url` filter: https://www.11ty.dev/docs/filters/url/

    // You can also pass this in on the command line using `--pathprefix`

    // Optional (default is shown)
    pathPrefix: "/",
    // -----------------------------------------------------------------

    // These are all optional (defaults are shown):
    dir: {
      input: ".",
      includes: "_includes",
      data: "_data",
      output: "_site",
    },
  };
};