Kotlin notebook is cool for testing my custom HTML DSL framework

# datascience

[Jason Zhao]

Kotlin notebook is cool for testing my custom HTML DSL framework

[altavir]

You can add a rendered for your type and it will be event cooler.

[roman.belov]

@Jason Zhao Yep, if you add something like

USE {
  render<WH>{ it.let { HTML(it.toString() } }
}

in the beginning of your notebook, or in [the notebook integration](https://github.com/Kotlin/kotlin-jupyter/blob/master/docs/libraries.md) class, then objects of WH type will always be rendered in a correct way

[Jason Zhao]

Unfortunately my WH class is inline value class and the renderer doesn't seem to like working on it.

[Jason Zhao]

It's a value class over StringBuilder so I'm guessing the notebook is treating it like a stringbuilder.

[Jason Zhao]

Also whenever I change the code I always need to restart the runtime or I seemingly always get "exception during IR lowering" when running my code. Is this a bug or just a result of how the notebook works?

[Jason Zhao]

Here is the rendering when I manually call the HTML render function

[altavir]

Yes, Inline classes are not that stable in scripting implementation. It is possible to add a notebook-only extension like this:

class WHWrapper(val value: VH)

fun WH(block: WH.()->Unit) = WHWrapper(WH().apply(block))

Then add an integration for WHWrapper.

[Ilya Muradyan]

@Jason Zhao please file a bug with exception during IR lowering here
It looks like a scripting bug

[Ilya Muradyan]

Regarding value classes: rendering is based on runtime reflection now, and this information is lost at runtime...Please vote for this issue: https://github.com/Kotlin/kotlin-jupyter/issues/421