Feature Request: generate and connect N objects programmatically without needing to explicity declare each one

[HariSekhon]

Is it possible to generate objects and connections programmatically instead of having to explicitly declare each one?

Compare these two pieces of code from D2 vs Python diagrams module:

for _ in range(15):
    opentsdb[_] = Custom(f"OpenTSDB pod {_}", opentsdb_icon)

classes: {
  opentsdb: {
    icon: ./images/opentsdb.png
  }
}

tsdb1: OpenTSDB pod1 {
  class: opentsdb
}
tsdb2: OpenTSDB pod2 {
  class: opentsdb
}
tsdb3: OpenTSDB pod3 {
  class: opentsdb
}
tsdb4: OpenTSDB pod4 {
  class: opentsdb
}
tsdb5: OpenTSDB pod5 {
  class: opentsdb
}
tsdb6: OpenTSDB pod6 {
  class: opentsdb
}
tsdb7: OpenTSDB pod7 {
  class: opentsdb
}
tsdb8: OpenTSDB pod8 {
  class: opentsdb
}
tsdb9: OpenTSDB pod9 {
  class: opentsdb
}
tsdb10: OpenTSDB pod10 {
  class: opentsdb
}
tsdb11: OpenTSDB pod11 {
  class: opentsdb
}
tsdb12: OpenTSDB pod12 {
  class: opentsdb
}
tsdb13: OpenTSDB pod13 {
  class: opentsdb
}
tsdb14: OpenTSDB pod14 {
  class: opentsdb
}
tsdb15: OpenTSDB pod15 {
  class: opentsdb
}

It then gets worse... because I then add 12 HBase nodes which underpin the OpenTSDB cluster...

... and then want a cartesian production of connections between each of the 15 OpenTSDB nodes vs the 12 HBase nodes... so 180 connections - programmatically in Python that's just a nested for loop iteration, but I can't see how to do this efficiently in D2.

[alixander]

D2 is a library too, so you can do that in Go (which has loops), and that'd be the equivalent of Python's Diagrams. See this post for more: https://terrastruct.com/blog/post/generate-diagrams-programmatically/

With text, there's no loops of course, as in all declarative languages. I think this feature would help though (once implemented): https://github.com/terrastruct/d2/issues/742