- Revised Arachne dot output significantly. It is now based on explicit

ranking instead of the subgraphs. This will make it easier to layout
  e.g. LaTeX MSCs using the same algorithm.

src/arachne.c

@@ -738,10 +738,11 @@ dotSemiState ()
 
       index = 0;
       rd = sys->runs[run].start;
-      if (sys->runs[run].protocol != INTRUDER)
+      if (sys->runs[run].protocol != INTRUDER && sys->runs[run].length > 0)
 	{
 	  // Regular run
 
+	  /* DISABLED subgraphs
 	  eprintf ("\tsubgraph cluster_run%i {\n", run);
 	  eprintf ("\t\tlabel = \"");
 	  eprintf ("#%i: ", run);
@@ -757,6 +758,10 @@ dotSemiState ()
 	    {
 	      eprintf ("\t\tcolor = blue;\n");
 	    }
+	    */
+
+
+	  // Display the respective events
 	  while (index < sys->runs[run].length)
 	    {
 	      // Print node itself
@@ -785,7 +790,7 @@ dotSemiState ()
 		  node (run, index - 1);
 		  eprintf (" -> ");
 		  node (run, index);
-		  eprintf (" [style=\"bold\", weight=\"2.0\"]");
+		  eprintf (" [style=\"bold\", weight=\"10.0\"]");
 		  eprintf (";\n");
 		}
 	      else
@@ -820,14 +825,9 @@ dotSemiState ()
 			    }
 			  rd = rd->next;
 			}
-		      if (done)
+		      // Draw the first box
-			{
+		      // This used to be drawn only if done && send_before_read, now we always draw it.
-			  // Activity other than claims...
+		      eprintf ("\t\ts%i [label=\"Run %i ", run,run);
-			  if (send_before_read)
-			    {
-			      // Sends first.
-			      // Show this explicitly in the graph by adding a prefix start node
-			      eprintf ("\t\ts%i [label=\"Start ", run);
 		      agentsOfRunPrint (sys, run);
 		      eprintf ("\", shape=diamond];\n");
 		      eprintf ("\t\ts%i -> ", run);
@@ -835,12 +835,12 @@ dotSemiState ()
 		      eprintf (";\n");
 		    }
 		}
-		    }
-		}
 	      index++;
 	      rd = rd->next;
 	    }
+	  /* DISABLED subgraphs
 	  eprintf ("\t}\n");
+	  */
 	}
       run++;
     }
@@ -931,10 +931,53 @@ dotSemiState ()
 			    }
 			  if (other_route == 0)
 			    {
+			      Roledef rd,rd2;
+			      /*
+			       * We have decided to draw this binding,
+			       * from run2,ev2 to run,ev
+			       * However, me might need to decide some colouring for this node.
+			       */
 			      eprintf ("\t");
 			      node (run2, ev2);
 			      eprintf (" -> ");
 			      node (run, ev);
+			      eprintf (" ");
+			      // decide color
+		              rd = roledef_shift (sys->runs[run].start,ev);
+		              rd2 = roledef_shift (sys->runs[run2].start,ev2);
+			      if (rd->type == CLAIM)
+				{
+				  // Towards a claim, so only indirect dependency
+				  eprintf ("[color=cornflowerblue]");
+				}
+			      else
+				{
+				  // Not towards claim should imply towards read,
+				  // but we check it to comply with future stuff.
+				  if (rd->type == READ && rd2->type == SEND)
+				    {
+				      // We want to distinguish where it is from a 'broken' send
+				      if (isTermEqual (rd->message, rd2->message))
+					{
+					  if (isTermEqual (rd->from, rd2->from) && isTermEqual (rd->to, rd2->to))
+					    {
+					      // Wow, a perfect match. Leave the arrow as-is :)
+					      eprintf ("[color=forestgreen]");
+					    }
+					  else
+					    {
+					      // Same message, different people
+					      eprintf ("[label=\"redirect\",color=darkorange2]");
+					    }
+					}
+				      else
+					{
+					  // Not even the same message, intruder construction
+					  eprintf ("[label=\"construct\",color=red]");
+					}
+				    }
+				}
+			      // close up
 			      eprintf (";\n");
 			    }
 			}
@@ -976,6 +1019,8 @@ dotSemiState ()
 	  count = 0;
 	  run = 0;
 	  while (run < sys->maxruns)
+	    {
+	      if (sys->runs[run].protocol != INTRUDER)
 		{
 		  int ev;
 
@@ -985,13 +1030,13 @@ dotSemiState ()
 		      if (myrank == ranks[node_number (run,ev)])
 			{
 			  if (count == 0)
-			  // For now, disabled
+			      eprintf ("\t{ rank = same; ");
-		          eprintf ("//\t{ rank = same; ");
 			  count++;
 			  eprintf ("r%ii%i; ",run,ev);
 			}
 		      ev++;
 		    }
+		}
 	      run++;
 	    }
 	  if (count > 0)