Control the colors and line of the references as in hyperref

[Atreyu-94]

It would be great to be able to control the colors of the references/citations as you can control them in hyperref. This is very useful for creating documentation or educational content, for example:

Lines	Colors

The way hyperref handles the layout is terrible but it is useful in the cases mentioned

[Dherse]

You can already do that using show and set rules on your references and links

[Atreyu-94]

Thank you! I haven't had time to review all the documentation, I thought this was not present. Do you have any example of use at hand? Thank you so much :)

[ghost]

I have added an example here to show that it is currently not possible with Typst.

[ghost]

I think you want the hyperref behaviour: have some color around the link when the pdf file is opened in a viewer, and have no color around the link if it is printed on a paper (the same with text color that disappears when printed).
If so, this is not currently possible. And I think there is also not an open issue currently.
But it is achievable at pdf level, so would be quite possible to implement this.

The way hyperref handles the layout is terrible

Not sure what you mean exactly. I never had problems with it. If you mean the misplaced rectangles in the first picture, I never had those, it looks like a bug in your source code.

[Atreyu-94]

Thank you so much! This is exactly the behavior I was referring to. This afternoon, after class, I'm going to open an issue about it.

Regarding the layout, the examples I used were not mine, however many times in my own documents the layout had that strange behavior as well.

[LectronPusher]

Here's an example of a show rule with a few options: (edit: if you're ok with this style also appearing when printed)

// Show links with a box around them or filled with a color
#show link: this => {
  let show-type = "box" // "box" or "filled", see below
  let label-color = green
  let default-color = rgb("#ff66ff")
  
  if show-type == "box" {
    if type(this.dest) == label {
      // Make the box bound the entire text:
      set text(bottom-edge: "bounds", top-edge: "bounds")
      box(this, stroke: label-color + 1pt)
    } else {
      set text(bottom-edge: "bounds", top-edge: "bounds")
      box(this, stroke: default-color + 1pt)
    }
  } else if show-type == "filled" {
    if type(this.dest) == label {
      text(this, fill: label-color)
    } else {
      text(this, fill: default-color)
    }
  } else {
    this
  }
}

== Heading <some_heading>
https://example.com \
#link(<some_heading>)[Link to heading] \
#link("https://example.com") \
#link("https://example.com")[See example.com]

[LectronPusher]

If you just want to add text or underlining to all links the same way, any of these one-liners should work:

// make links blue
#show link: set text(fill: rgb(0, 0, 255))

// underline links
#show link: underline

// surround links with a green box
#show link: box.with(stroke: green, inset: (bottom: 2pt))

[ghost]

As I have written in the comment above: this is not the hyperref behaviour, the boxes do not disappear when printed.

url with typst.pdf

url with hyperref.pdf

printed_hyperref.pdf

printed_typst.pdf

[LectronPusher]

Ah, apologies, I didn't read your comment closely enough. The original post wasn't clear that was what they wanted. Definitely would be a nice feature to have!

[Atreyu-94]

@LectronPusher Thank you very much too. I'm going to use your examples while the feature is implemented (if the developers decide)