How to negate / escape a show rule?

[Xyy]

Heya,

I’m trying to implement a custom function where the function does not follow of any previous #show implementation. Something as follows:

// This makes all links to have underlines in the document
#show link: underline

#let hiddenlink = (url, body) => {
  // I want this link to not have any underlines!
  #link(url)[#body]
}

Preferably without any state management / counters, what’s the best way of doing this?

Thanks a lot!

[vmartel08]

Hello @Xyy,

Welcome to the forum.

The answer is not really to cancel the show rule (as this is not as easy to do) but you will find a solution to your question in How do I underline URLs with display texts containing more than one character? - #3 by bluss

[Maxwell]

The answer of @bluss is pretty well, but if u dont’t want to call the function nonunderline() every where, try:

#show link: it => {
  let b = it.body.text
  if b.at(-1) == "-" {
    show underline: u => u.body
    link(it.dest, b.slice(0,-1))}
  else {
    underline(it)}}

#link("https://www.a.com")[Web A]
#link("https://www.b.com")[Web B-]

As for general show/set rule escaping, see:

How can I bypass set/show rules to revert to the default?

No. Currently we can’t revoke set/show rules in Typst. But it’s a planned feature: Related issue, Typst Roadmap If you want to apply two different styles to the same element, you can encapsulate the element with specific styles into a function, for example: #let styled-text(..args) = { set text(font: "Buenard") text(..args) } #styled-text("123", size: 10pt) But I guess there’s probably no way to encapsulate the default style into a function, especially when you applied a show rule.

[Xyy]

Oh wow, TIL you can just ‘redefine’ internal functions like that.
Very interesting approach!

[gezepi]

If you do redefine the standard functions and want to use them later, you can use the std module:

#underline[Normal]\
#let underline = emph
#underline[redefined]\
#std.underline[std module]