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[PoC] Global styles Custom CSS: use codemirror for editing #53380

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@glendaviesnz glendaviesnz commented Aug 7, 2023

What?

Add codemirror to allow autoformatting, etc. when editing custom CSS in global styles.

Why?

Currently the plain text input with no formatting makes editing custom CSS difficult, and codemirror is already used in the core project for the CSS editor in Customizer.

Possible fix for: #47945

How?

Adds codemirror to the Gutenberg project and lazy loads it only if the custom CSS editing tab is loaded in the site editor.

I did explore using the existing core codemirror bundle, but this would involve running script-loader.php file for the site editor which is a very outdated approach to loading js dependencies, and would also load the full codemirror dependency even if the user never accessed the custom CSS panel.

Testing Instructions

  • Go to the site editor and load the editor
  • Select the global styles panel on the right
  • Make sure dev tools network tab is open
  • In the overflow menu top right select Additional CSS
  • Make sure the module index.js file loads when you do this and that the editor loads
  • Add some CSS to the editor box and make sure line numbers appear, CSS autocompletion appears N.B don't worry about text indentation, or trying to save, neither of these are working on this diff yet.

Screenshots or screencast

css-edit.mp4

@glendaviesnz glendaviesnz added [Type] Enhancement A suggestion for improvement. [Status] In Progress Tracking issues with work in progress Global Styles Anything related to the broader Global Styles efforts, including Styles Engine and theme.json labels Aug 7, 2023
@glendaviesnz glendaviesnz self-assigned this Aug 7, 2023
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github-actions bot commented Aug 7, 2023

Size Change: +1.79 kB (0%)

Total Size: 1.78 MB

Filename Size Change
build/block-editor/index.min.js 219 kB +901 B (0%)
build/block-editor/style-rtl.css 15.6 kB -1 B (0%)
build/block-editor/style.css 15.6 kB -2 B (0%)
build/block-library/index.min.js 211 kB +16 B (0%)
build/components/index.min.js 249 kB +447 B (0%)
build/components/style-rtl.css 11.9 kB +30 B (0%)
build/components/style.css 11.9 kB +30 B (0%)
build/edit-post/index.min.js 35.6 kB +7 B (0%)
build/edit-post/style-rtl.css 7.88 kB -5 B (0%)
build/edit-post/style.css 7.88 kB -5 B (0%)
build/edit-site/index.min.js 203 kB +37 B (0%)
build/patterns/index.min.js 4.04 kB +345 B (+9%) 🔍
build/url/index.min.js 3.83 kB -12 B (0%)
ℹ️ View Unchanged
Filename Size
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build/4936/index.min.js 739 B
build/a11y/index.min.js 964 B
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github-actions bot commented Aug 8, 2023

This pull request changed or added PHP files in previous commits, but none have been detected in the latest commit.

Thank you! ❤️

@glendaviesnz
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I am also going to explore the possibility of lazy loading the core dependency somehow but feel free to comment if you have thoughts on the best way to incorporate codemirror into the site editor.

@glendaviesnz
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Just started working in this again, will hopefully have it functional again soon

@glendaviesnz
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PR should be fully functional again.

@glendaviesnz glendaviesnz changed the title [WIP] Global styles Custom CSS: use codemirror for editing [PoC] Global styles Custom CSS: use codemirror for editing Oct 12, 2023
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@Mamaduka, @youknowriad do you have any thoughts on this lazy loading approach to adding code syntax highlighting, etc. to the global styles custom CSS input box in order to match the functionality of the old customizer custom CSS input?

As noted in the PR description I did explore using the existing core codemirror bundle from core, but this would involve running script-loader.php file for the site editor which is becoming an outdated approach to loading js dependencies, and this approach would also load the full codemirror dependency even if the user never accessed the custom CSS panel.

This is just a PoC implementation. If you thought this was an approach worth exploring it would make sense to abstract this out of the site editor and make it a reusable component that the likes of the Code block could potentially use.

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A long time ago we used to have syntax highlighting in a few places in Gutenberg. That said, that work has been reverted and put on a pause for some time. The reason is that we didn't want to load these syntax highlighter libraries synchronously and increase the bundle size.

So right now, we have import maps supports almost in all browsers and we have a POC for a import map support here

I believe the ideal scenario would be to actually first land lazy loading APIs and use them to implement syntax highlighting.

I also know that @luisherranz @jsnajdr and friends were looking recently at the import map thing.

@glendaviesnz
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glendaviesnz commented Oct 12, 2023

Thanks @youknowriad, the import maps will potentially be a better approach than the react lazy loading used in this PR, will take a look at that, thanks for the pointer.

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luisherranz commented Oct 12, 2023

I think using Webpack's import() is fine for this use case. We can switch to the native import() once the import maps are available.

The main difference between Webpack's import("codemirror") and native import("codemirror") is that Webpack's code-splitted chunks can only be accessed by files that were generated during that Webpack build, whereas code-splitted chunks included in the import map can be accessed by any module in the page.

So I think it's fine to use Webpack's import() for now. We just need to make sure that the same "codemirror" chunk is reused when you import it from different places (block-editor, block-library, etc), which if it doesn't, means we need to tweak the Webpack config.

The only drawback is, as I said, that any external plugin that also wants to use "codemirror" will need to include it in its own bundle, and the page will have two copies of it.

But once we have import maps, we can change the Webpack configuration to mark the "codemirror" dependency as external and everything should keep working as it is, except that now external plugins will also be able to import the same copy of "codemirror" from the import map.

I hope that makes sense 🙂

@okmttdhr
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@youknowriad @glendaviesnz @luisherranz
I'm proposing #60155 utilizes Webpack’s dynamic import() as a temporary measure to lazy-load CodeMirror, as I agree with this comment.

This code should work even when we adopt importmap later. Once we turn all @wordpress/* packages (specifically block-editor in this case) into modules by using output.module=true, we can externalize codemirror and register the script as a module by wp_register_script_module('@wordpress/block-editor') setting codemirror as a dependency module.

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Closing in favor of #60155

@Mamaduka Mamaduka deleted the update/custom-css-add-editor branch March 27, 2024 03:36
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4 participants