Backport zsh_autocomplete from master to the v1 branch

[oleorhagen]

What type of PR is this?

• bug
• cleanup
• documentation
• feature

What this PR does / why we need it:

Backports the autocomplete/zsh_autocomplete file from master to v1 as there is nothing keeping these files from being mirrored.

Which issue(s) this PR fixes:

No open issues for this.

Testing

This is tested locally, and the auto-completion scripts have no tests at the moment.

Release Notes

(REQUIRED)

Backported the ZSH auto-completion script from master in order to:
* list files if no completions are present.
* auto-complete flags

[coilysiren]

I'm not sure why CI is failing, can you re-request my review after you've look into that?

Also, v1 is intended to be in maintenance mode and isn't meant for getting new features. This is an ok exception since it's a simple change, but in general if you want new features then you need to migrate to v2.

[oleorhagen]

I'm not sure why CI is failing, can you re-request my review after you've look into that?

Also, v1 is intended to be in maintenance mode and isn't meant for getting new features. This is an ok exception since it's a simple change, but in general if you want new features then you need to migrate to v2.

Thank you @lynncyrin.

Yes, I understand the release cycle for semantic versioning. However, for some enterprise software the cycles can be loooong, thus we are stuck on v1 for some time still.

Also, I would not consider this a feature, but a fix, considering, what it is really doing is porting the buf-fixes from the auto-complete script in v2.

However, this is all up to you, on how you guys want to handle this :)

Thank you for a nice CLI library!

[saschagrunert]

LGTM