command line interface

With the CLI, in distributed systems talks you can just do this to visualize your topology:

```
undirender a-b b-c c-a
a___
|   \___
|       \____
|            \___
|                \____
|                     \___
|                         \___
|                             \____
|                                  \___
|                                      \____
|                                           \___
|                                               \___
|                                                   \____
|                                                        \___
|                                                            \____
|                                                                 c¯¯¯¯¯¯¯¯¯¯¯¯¯
|                                           /¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
|                     /¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
b
```