Handle Html in Chapter model about elm-book

[georgesboris]

OMG the size of that PR 😅

So! By reading through some of your chapter examples I couldn't find exactly what you described. But in theory your custom model can hold anything as long as you provide the type – however, ElmBook can only handle ElmBook.Msg as the final message passed through your html. You can still map your own messages to ElmBook's though!

Like, this is fine as a data type:

-- Chapter

type alias SharedState s =
    { s | chapter : List (Html msg) }

-- Book

type alias BookState msg =
    { chapter : List (Html msg)
    }
  
main : Book (BookState msg)
main =
    ...

The problem would happen if your view had Html SomeOtherMsg – but then I don't see why wouldn't you be able to just use Html.Styles.map to change it to a valid ElmBook msg when using it on your chapter. Does this make any sense at all? Please reach me on Slack if you wanna discuss further – we can jump on a call and figure out how to make it work! :)

[georgesboris]

Closing for now – but please reach me here or on Discord/Slack for further discussion! 🙇