Feature request: class shortcodes for connectors

[muteboy]

I use classes to assign special arrowheads to certain connectors, as described here: https://d2lang.com/tour/connections#arrowheads

For example:

classes: {
  1_to_composition_many: {
    source-arrowhead: 1
    target-arrowhead: * {
      shape: diamond
      style.filled: true
    }
}

and then

box1 -> box2: {class: 1_to_composition_many}

Rather than have to specify the class every time, perhaps I could define the class as usual, then use a shortcode in the connector to assign the class:

classes: {
  1_to_composition_many: {
    shortcode: 1--*<>
    source-arrowhead: 1
    target-arrowhead: * {
      shape: diamond
      style.filled: true
    }
}

and then

box1 1--*<> box2

would assign the class to the connector

[alixander]

It's a clever idea but I don't like how it'll break without the class being defined.

Would using globs and coding the src/dst names be enough? E.g. any box going to any box has this:

classes: {
  1_to_composition_many: {
    source-arrowhead: 1
    target-arrowhead: * {
      shape: diamond
      style.filled: true
    }
  }
}
(box* -> box*)[*].class: 1_to_composition_many

box1 -> box2

[muteboy]

I can understand the concern.
Good idea about the globs. Could I do that based on the connector label?
So all connectors with the label "many to many" are assigned the class "many_to_many"?

[alixander]

Yes, using filters

https://play.d2lang.com/?script=qlDQtVOo5EoEUUlWCrmJeZW6Jfm6IJqLS0NLCySupaUZrRVrpVDNpaCglpOYlJqDplBBobikMidVr7ikKD871UqhKDWFq5YLEAAA__8%3D&