I've used https://github.com/chrisallenlane/cheat for something similar to this as well. Do you know how the work flow differs?
Cheat looks similar to eg, but I would argue that eg is prettier, with `man`-style default coloring and the ability to customize the colors to whatever scheme you want. eg includes a more usable explanation rather than pure examples. It also takes a "create your own examples" approach, while cheat seems to take more an "edit your own examples" approach. You can do both with eg, but the general idea is that you would leave the defaults as is.
Still, cheat is a great link. I should probably add a "similar tools" section to the eg readme.