Highlight the content of passthrough block as HTML / CSS /JS

Hi,

The plugin is already fantastic, and getting better, but I recently had to use some block passthough for some simple html where I didn’t want to use include, and I thought this could be a simple welcome enhancement to inject IntelliJ HTML syntax highlighting.

The example above is more complex that what I need to do, but I thought this a is good showcase of the feature.

++++
<details>
<summary>
</summary>

<style>
/* some css */
</style>

<script>
/* some js */
</script>

<div>
<video poster="poster.png">
  <source src="video.webm" type="video/webm">
</video>
</div>

</details>
++++

AsciiDoc Plugin Version: 0.30.9 IDE Name and Version: IntelliJ IDEA 2019.3 EAP

[ahus1]

Work started on this feature. Still need to add the configuration menu option to disable it and/or change the language injected for pass through content. Default will be HTML.

[ahus1]

The latest preview-version of the plugin 0.30.22 highlights pass through content. As default it assumes this is HTML. The user can change the language in the plugin settings, or disable it by clearing the field.

If the pass through content contains an include macro, it will not be highlighted by the plugin. This is due to the fact that an include:[] is per se no valid HTML, and therefore the block will most likely show errors when trying to highlight it. Suggestions for future enhancement of this behavior are welcome.

This is part of the latest pre-release of the plugin is available from GitHub releases and the IntelliJ AsciiDoc EAP repository.