completion: complete to aliases

[jbohren]

Currently bash completion doesn't complete to aliases, but this would be useful to have.

[jbohren]

To do this, catkin should have a --list-verbs option, which the completion scripts could call.

[wjwwood]

Wouldn't you just need catkin --list-aliases and then a catkin --expand-aliases <args> which returns the expanded args?

For example, if you had the alias b: build -v and you did catkin b <tab><tab> should it expand that to build -v on the input line or just give the available build verb options?