Is there any command line utility to get a topological sort of a directed graph written down in graphviz `dot` format?

Preferably, I would prefer that instead of a linear order, I was given a list of lists, where each list has the next level of dependency.

For example, something in homebrew or github?

Or, is there a tool to convert a graph in `dot` format to a graph in the format required by unix `tsort`? In any case, `tsort` is less than what I want, as discussed above.