Support shorthand notation for list of source/destination nodes in an edge.

[guy4261]

Proposal

Support shorthand notation for multiple sources/destinations - like dot/graphviz does.

Multiple Sources

digraph G {
  subgraph cluster_multi_source {
    {a1, b1} -> c1
  }
}

flowchart TB
    a1-->c1
    b1-->c1

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Multiple Destinations

digraph G {
  subgraph cluster_multi_dst {
    a2 -> {b2, c2}
  }
}

flowchart TB
    a2-->b2
    a2-->c2

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Multiple Sources AND Destinations (=cartesian product)

digraph G {
  subgraph cluster_multi_both {
    {a3, b3} -> {c3, d3}
  }
}

flowchart TB
    a3-->c3
    b3-->c3
    a3-->d3
    b3-->d3

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Singletons are treated as ordinary nodes

digraph G {
  subgraph cluster_singletons {
    a4 -> {b4} -> c4
  }
}

flowchart TB
    a4-->b4-->c4

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Example

Whatever you see fit - use [a, b, c] or {a, b, c} or anything else that works for you.

Screenshots

Added in the Proposal part (rendered mermaid equivalent to the dot listings).