Scala app to print out DAG to the console in ascii format

I need a simple Scala application to print out DAG to the console in ascii format. Suppose I have a DAG which is represented by case class Node(name: String, predecessors: Set[Node], successors: Set[Node]) case class Topology(nodes: Set[Node]) I'd like to be able to print out to the console an ascii graph similar to a one produced by `git log --graph --abbrev-commit --decorate --format=format:'%C(blue)%h%C(reset)' ` * e1675c6 * 0a98174 * ee5dbdd |\ | * 5a10168 | * ca4a34c | |\ | |/ |/| * | 19ae7d2 * | 82e7834 | * db5217d | |\ | |/ |/| * | 3f92c53 |\ \ | * \ 19ab67c | |\ \ | |/ / |/| | | * | 3ab8ae9 | * | aa88cfd | * | 54e6daa Additionally, I'd like to be able to colour DAG branches (again similar to a git log command provided above). It doesn't need to be interactive as git log (where you can scroll up / down or search).