Lume 2.3.0 - Andrés do Barro

5 min read

Releases

Lume 2.3.0 is dedicated to Andrés do Barro, a Galician singer and songwriter who was one of the first artists who achieved success singing in Galego out of Galicia. Among his songs, we can find Pandeirada and O trén.

TL/DR

If you are using the nav plugin, see this.

New function parseBasename

When Lume loads a page file, the basename (the filename after removing the extension) is parsed to extract additional data. This feature makes it possible that, for instance, if the basename starts with yyyy-mm-dd_*, Lume extracts this value to set the page date, and remove it from the final name, so the file /2020-06-21_hello-world.md generates the page /hello-world/.

As of Lume 2.3.0, you can add additional parsers with the new function site.parseBasename.

Let's say we want to use a variable named order to sort pages in a menu, and we want to extract this value from the file name. For example the file /12.hello-world.md outputs the page /hello-world/ and sets 12 as the order variable. We can achieve this with the following function:

site.parseBasename((basename) => {
  // Regexp to detect the order pattern
  const match = basename.match(/(\d+)\.(.+)/);

  if (match) {
    const [, order, basename] = match;

    // Return the order value and the new basename without the prefix
    return {
      order: parseInt(order),
      basename,
    };
  }
});

As you can see, the function is simple: it receives the basename and return an object with the parsed values. Note that the returned object contains the basename without the prefix, in order to be removed from the final URL.

See more info in the documentation page.

Restart after modifying the _config.ts and _cms.ts files

Until now, if you modify the _config.ts file during the server mode, you must stop the process and start it again to see the changes. This is very inconvenient, especially in the early phases of development, when you may want to try different plugins or make changes to the Lume configuration.

From now on, the building process is run inside a Worker. This change allows us to stop the build and restart it again without stopping the main process (under the hood, it is done by closing the Worker and creating a new one).

For now, the rebuild is triggered every time a change in the _config file is detected. In the next versions, we can add additional triggers.

In CMS mode (with deno task cms), the process is also restarted if the _cms.ts file is modified, which is useful when you are configuring the documents and collections.

New sorting methods asc-locale and desc-locale

When searching pages using the search helper, you can sort them by any field, for example, the title:

const pages = search.pages("type=post", "title=asc");

Under the hood, Lume sorts the pages with array sort using basic comparison operators (> and <):

pages.sort((a, b) => a == 0 ? 0 : a.title > b.title ? 1 : -1);

This works fine in many cases, but not when you have strings with accents, different cases, etc. In these cases localeCompare works much better. In this version, we have introduced two new locale methods: asc-locale and desc-locale. So the previous example can be improved with:

const pages = search.pages("type=post", "title=asc-locale");

New plugin SRI

SRI (Subresource Integrity) is a browser feature to protect your site and your users from compromised code loaded from external CDN. It verifies the code loaded by the browser is exactly the same code that you got during the build process, without unexpected manipulations. You can learn more about SRI in the MDN article.

Lume had an experimental SRI plugin that has been moved to the main repo, so now it's part of the official plugins collection:

import lume from "lume/mod.ts";
import sri from "lume/plugins/sri.ts";

const site = lume();
site.use(sri());

export default site;

The plugin searches for <script> and <link rel="stylesheet"> elements in your pages that load resources from other domains and add the integrity and crossorigin attributes automatically. For example, if you have this code:

<script src="https://code.jquery.com/jquery-3.7.0.slim.min.js"></script>

The plugin outputs the following:

<script src="https://code.jquery.com/jquery-3.7.0.slim.min.js" integrity="sha256-tG5mcZUtJsZvyKAxYLVXrmjKBVLd6VpVccqz/r4ypFE=" crossorigin="anonymous"></script>

See more info in the plugin documentation page.

Important

In this version, the nav plugin got a small BREAKING CHANGE (sorry for that).

The nav plugin is useful for creating menus at multiple levels.

BREAKING CHANGE: Changed the tree data interface

The nav.menu() function returns an object tree using the pages' URL. Every object in the tree is a page or a directory and in previous Lume versions, it could have the following properties:

  • item.slug The name of the page or folder.
  • item.data If the element is a page, this is the data object of the page. If it's a folder, this value is undefined.
  • item.children An array of sub-pages and sub-folders.

These properties didn't fit well to order the elements, especially the sub-folder items. In the new structure, the slug property has been removed (Edit: it was restored in Lume 2.3.1 due some bugs) and this value is stored in data.basename.

This change affects to how this tree is iterated in your template. For instance, if in Lume 2.2 we have the following code:

if (item.data) {
  // item.data exists, it's a page
  return `<a href="{{ item.data.url }}">{{ item.data.title }}</a>`;
} else {
  // It's a folder
  return `<strong>{{ item.slug }}</strong>`;
}

With the changes in Lume 2.3, the code must be changed to:

if (item.data.url) {
  // item.data.url exists, it's a page
  return `<a href="{{ item.data.url }}">{{ item.data.title }}</a>`;
} else {
  // It's a folder
  return `<strong>{{ item.data.basename }}</strong>`;
}

Now both pages and folder items store the basename in the same place (data.basename), and it's easy to sort the elements alphabetically:

const menu = nav.menu("/", "", "basename=asc");

And even use the new locale sorting methods:

const menu = nav.menu("/", "", "basename=asc-locale");

Added functions to get the next and previous pages

In this version the functions nav.nextPage() and navPreviousPage() have been added, to ease the navigation to the next and previous pages.

For example, let's say we have created the following tree structure with the function nav.menu():

docs
  |__ getting-started
        |__ installation
        |__ configuration
  |__ plugins
        |__ prettier

The new function nav.nextPage returns the next page relative to the provided URL. For example:

const nextPage = nav.nextPage("/docs/getting-started/installation/");
console.log(nextPage.url); // /docs/getting-started/configuration/

If the page is the last sibling of the current section, it returns the first page of the next section:

const nextPage = nav.nextPage("/docs/getting-started/configuration/");
console.log(nextPage.url); // /docs/plugins/

If the current section has children, it returns the first child:

const nextPage = nav.nextPage("/docs/plugins/");
console.log(nextPage.url); // /docs/plugins/prettier/

The nav.previousPage() works similarly but in reverse order.

Other changes

  • Plugins and middlewares can be imported using named imports, in addition to the default exports:

    import basePath from "lume/plugins/base_path.ts";
// it's the same as
import { basePath } from "lume/plugins/base_path.ts";

  • Several bug fixes and improvements have made to the watcher and live reload.

And there are many more changes that you can see in the CHANGELOG file.