Graphviz change edge direction - linked-list

Question

I use graphviz on hackmd and draw a graph like this
my code is:
digraph G {
rankdir=LR
node [color=black,shape=record]
node0 [label="{<data>node 0|<next>}"]
node1 [label="{<data>node 1|<next>}"]
new_node [label="{<data>new_node|<next>}"]
null0 [shape=none, label="NULL"]
null1 [shape=none, label="NULL"]
head [shape=none, label="head"]
ptr [shape=none, label="ptr"]
indirect [shape=none]
head->ptr
indirect->node0:next [constraint=false headport=s tailport=n];
ptr->node0
node0:next:c->node1 [arrowhead=normal, arrowtail=dot, dir=both, tailclip=false];
node1:next:c -> null0 [tailclip=false, arrowtail=dot, dir=both]
new_node:next:c->null1 [arrowhead=normal, arrowtail=dot, dir=both, tailclip=false];
{rank=same; indirect node1;}
}
I want node0 and indirect on the same rank. However, when I change
{rank=same; indirect node1;} -> {rank=same; indirect node0;}
they will have error message: "Error: lost indirect node0 edge"
The actual graph I want:

Answer 1

Change your layout to use html style labels instead of shape=record
digraph G {
rankdir=LR
node [color=black shape=none margin=0 height=.3 ]
node0 [label=<<table border="0" cellborder="1" cellspacing="0"><tr><td port="data">node 0</td><td port="next"> </td></tr></table>>]
node1 [label=<<table border="0" cellborder="1" cellspacing="0"><tr><td port="data">node 1</td><td port="next"> </td></tr></table>>]
new_node [label=<<table border="0" cellborder="1" cellspacing="0"><tr><td port="data">new_node</td><td port="next"> </td></tr></table>>]
null0 [shape=none, label="NULL"]
null1 [shape=none, label="NULL"]
head [shape=none, label="head"]
ptr [shape=none, label="ptr"]
indirect [shape=none]
head->ptr
indirect->node0:next [constraint=false headport=s tailport=n];
ptr->node0
node0:next:c->node1 [arrowhead=normal, arrowtail=dot, dir=both, tailclip=false];
node1:next:c -> null0 [tailclip=false, arrowtail=dot, dir=both]
new_node:next:c->null1 [arrowhead=normal, arrowtail=dot, dir=both, tailclip=false];
{rank=same indirect node0}
}