Add HTML entity support to Slang

[donovanglover]

Hello,

First of all, thank you for spending the time to create Slang! I've used Haml in the past and personally enjoy how Slang differs from it (I hope that doesn't change anytime soon!).

As I was playing around with Slang, I noticed that the ampersand symbol (&) always gets converted to &. This doesn't work so well when you want to use HTML entities like © and €.

Input: €
Expected output: €
Actual output: €

Would love to have some feedback on this!

[jeromegn]

This could be an issue with Crystal itself. It does not support ignoring these when escaping HTML.

For instance, they've added support to unescape all the HTML5 entities, but not the other way around: crystal-lang/crystal#5055

It sounds like the reverse may be doable and desirable.

[reiswindy]

Faced the same issue when using ©
I'm using this workaround in the meantime and so far it seems to work.

div.copyright
  span == "©" 
    | #{Time.now.year}