Auto completion for dynamic scripts including possible arguments

[kaspernissen]

Auto completion for dynamic scripts and arguments would enhance the experience using shuttle

[Crevil]

Cobra support this pretty easily already. The project has some documentation on how to do it based of how kubectl handles completion of pod names etc.

https://github.com/spf13/cobra/blob/master/bash_completions.md

Basically what we need to do is to write some bash script that uses shuttle list or equivalent commands to get available targets.
I'm not completely sure on how to get the argument specifications.

Maybe if we make the list command able to parse the argument descriptions as well we could maybe do a lookup when the command is selected.

Some seudo code for the approach:

shuttle run [tab][tab]                     # lookup targets with 'shuttle list'
shuttle run build [tab][tab]           # lookup flags with 'shuttle list build'

[Crevil]

With #14 implemented we can extend it with the option to define a template to shuttle run <script> --help --template -o=go-template.
This way we can query the arguments of each script and control the output.