.eleventy.js

const fs = require("fs");
const path = require("path");
const yaml = require("js-yaml");

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

const pluginRss = require("@11ty/eleventy-plugin-rss");
const pluginSyntaxHighlight = require("@11ty/eleventy-plugin-syntaxhighlight");
const { EleventyRenderPlugin } = require("@11ty/eleventy");
const pluginNavigation = require("@11ty/eleventy-navigation");
const PostCSSPlugin = require("eleventy-plugin-postcss");
const RHDSPlugin = require("./_plugins/rhds.cjs");

/**
 * @see https://stackoverflow.com/a/12646864/2515275
 * @license CC-BY-NC-SA 2.0 Laurens Holst
 */
function shuffleCopyArray(array) {
  const copy = Array.from(array);
  for (let i = copy.length - 1; i > 0; i--) {
    const j = Math.floor(Math.random() * (i + 1));
    [copy[i], copy[j]] = [copy[j], copy[i]];
  }
  return copy;
}

module.exports = function(eleventyConfig) {
  // Copy the `assets` folder to the output
  eleventyConfig.addPassthroughCopy("assets");

  // Add plugins
  eleventyConfig.addPlugin(pluginRss);
  eleventyConfig.addPlugin(pluginSyntaxHighlight);
  eleventyConfig.addPlugin(pluginNavigation);
  eleventyConfig.addPlugin(EleventyRenderPlugin);
  eleventyConfig.addPlugin(PostCSSPlugin);
  eleventyConfig.addPlugin(RHDSPlugin);

  eleventyConfig.addDataExtension("yaml", contents => yaml.load(contents));

  eleventyConfig.addFilter("randomSort", /** @param {unknown[]} list */list =>
    shuffleCopyArray(list));

  eleventyConfig.addFilter("readableDate", dateObj =>
    DateTime.fromJSDate(dateObj, {zone: 'Asia/Jerusalem', locale: 'he'})
      .toFormat("dd LLL 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');
  });

  // https://html.spec.whatwg.org/multipage/common-microsyntaxes.html#valid-date-string
  eleventyConfig.addFilter('pick', /** @param {unknown[]} list */(list, count) =>
    Array.from(list).slice(0, count));

  // 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)

  // 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]);
  });

  eleventyConfig.on('eleventy.before', async (e) => {
    console.log('bundling <github-repository>');
    const { build } = await import('esbuild');
    await build({
      bundle: true,
      outfile: '_site/assets/gh.min.js',
      minify: true,
      format: 'esm',
      stdin: {
        contents: 'import "github-repository";',
        sourcefile: 'github-repository.js',
        resolveDir: path.join(__dirname, 'node_modules'),
      }
    });
    console.log('  ...done');
  });
  // Customize Markdown library and settings:
  let markdownLibrary = markdownIt({
    html: true,
    linkify: true
  }).use(markdownItAnchor, {
    permalink: markdownItAnchor.permalink.ariaHidden({
      placement: "after",
      class: "direct-link",
      symbol: "#"
    }),
    level: [1,2,3,4],
    slugify: eleventyConfig.getFilter("slugify")
  });
  eleventyConfig.setLibrary("md", markdownLibrary);

  // Override Browsersync defaults (used only with --serve)
  eleventyConfig.setBrowserSyncConfig({
    callbacks: {
      ready: function(err, browserSync) {
        const content_404 = fs.readFileSync('_site/404.html');

        browserSync.addMiddleware("*", (req, res) => {
          // Provides the 404 content without redirect.
          res.writeHead(404, {"Content-Type": "text/html; charset=UTF-8"});
          res.write(content_404);
          res.end();
        });
      },
    },
    ui: false,
    ghostMode: false
  });

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

    // 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: process.env.ELEVENTY_PATH_PREFIX || "",
    // -----------------------------------------------------------------

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