Support line spacing

[crysxd]

Hi! Thanks for this super helpful tool!

I'm currently building templates for an Android app. In Zeplin the line height is defined for some of our text styles (e.g. 18.2) with a text size of e.g. 15. To configure this in Android we need to have the "line spacing extra" being 3.2 in this example (18.2 - 15).

It would be great to do something like {{% textStyle.lineHeight - textStyle.fontSize %}} or a similar syntax.

[freak4pc]

Hey @crysxd, thank you very much! :)
Always exciting hearing of more people using Prism.

I think it would be non-trivial (and mostly useless for other cases) to support math as a whole, but — I believe we can easily add textStyle.lineSpacing instead, which prism will internally compute for you.

WDYT?

[crysxd]

That would be amazing! Simple workaround