Bug: .alias and string completion

[mkunz7]

Describe your environment

1. minimega version: latest
2. Linux distro/version: 18.04
3. Go compiler version: 1.12
4. VM types / na

Describe the bug Creating aliases that would string complete crash minimega

To Reproduce

.alias v=vm info
v

or

.alias h=vm info
h

Expected behavior aliases should take precedence over words in the grammar and not crash mini

[jcrussell]

Example output:

minimega[minimega]$ .alias v=vm info
minimega[minimega]$ v
2019/08/07 10:57:22 INFO minicli.go:252: expanding v -> vm info
2019/08/07 10:57:22 INFO minicli.go:252: expanding v -> vm info
2019/08/07 10:57:22 FATAL minicli.go:198: invalid command: `vm infom info`

Aliases currently expand prefixes. Should we change it to only expand exact matches? Not sure why it's double expanding.

[djfritz]

I'm guessing it should probably behave like bash aliases, as that's what folks are generally used to - so no recursive expansion and only when wrapped as a singular token (wrapped in whitespace).

Thoughts? @jcrussell It seems like we're halfway there... dunno.