Draw a graph of multiple instances of same project

instances.dot

/*
Did you ever hatively make different checkouts of the same project
to test a feature, describe a bug, or whatever reason, and then forget to clean up or tidy
them afterwards ? After a while, it could get difficult to find your way ...

This example graph could help me a lot to visualize which is what, what could cause problems
when upgrading, and to correct things.

It should be easy enough to use as a base to describe your own data.
*/
digraph G {
	subgraph cluster_gh { // remote urls
		label = "GitHub";
		node [shape=box, style=filled];
		syl20;RR29;

    { // branches
      syl20 -> syl20_master [label="master"];
      syl20 -> syl20_dev [label="develop"];
      RR29 -> RR29_master [label="master"];
    }
    { // commits
      node [shape=record];
      edge [weight=1];
      
      _c277 [label="{#c277|tag:0.200.7|date:TODO}"];
      syl20_master -> _c277 [label="release 0.200.7"];
      _0c8a [label="{#0c8a|date:TODO}"];
      syl20_dev -> _0c8a [label="HEAD"];
      _2fbd [label="{#2fbd|date:TODO}"];
      RR29_master -> _2fbd [label="fix org contrib"];
      
    }
	} 
	subgraph cluster_dennet{ // instances ( local urls)
		label = "Dennet";
		d1 [label="~/.emacs.d1"];
		d2 [label="~/.emacs.d2"];
		d3 [label="~/.emacs.d3"];
		d4 [label="~/.emacs4"];
		dev [label="~/.emacs.dev.d"];
		node [shape=ellipse]
    {// symlinks
      node [style=dashed];
		  d [label="~/.emacs.d"]; 
      edge [label = "symlink-to", weight=10, arrowhead=empty, style=dotted];
      d->dev;
    }
    { // checkouts
      edge [weight=5];
      {d1; d2; d4} -> _c277;
      dev -> _0c8a;
      d2 -> _2fbd;
      
}
	}
	{ // url names
    edge [style=dashed];
    
	edge [label="checkversion"];
	{d;d1;dev} -> syl20 [color=green,fontcolor=green]; 
	edge [label="origin"];
	{d; dev} -> d [color=red,fontcolor=red];
	{d2} -> d1;
	{d1; d3} -> syl20 [color=blue,fontcolor=blue];
	edge [label="rr"];
	{d1} -> RR29 [color=orange,fontcolor=orange];
	edge [label="gh"];
	{d2} -> RR29 [color=orange,fontcolor=orange];
	edge [label="upstream"];
	{d1} -> syl20; 
	edge [label=""];
}
}
/* 
Copyright (c) 2017 RockyRoad29 , some rights reserved
Distributed under License CC-BY-NC-SA 4.0
*/

Once compiled with dot, it gives this:

I might post my corrected layout later, but it is not my real point here.