Import and update shell completions

[evelikov]

Currently we have the bash completion in-tree, while the zsh lives in the upstream zsh project itself. Both of those are somewhat outdated.

A hand-wavy todo/ideas list:

• import the zsh completion
• compare against the respective programs (manual pages are outdated Update the man pages against the respective tool #57) and update
  • should we have completion for the deprecated options?
• add note to the readme/hacking so we don't update them in the future
• after 1-2 kmod releases poke upstream zsh to drop their variant

Soft depends on #56

[evelikov]

Seems like the in-tree one is very bare-bones. The extra ones are in third-party repo ...

Might be worth pulling them all together, fish anyone?

[evelikov]

Kicked off some upstream discussions, wrt copyright license etc

• bash: kmod upstream integration scop/bash-completion#1246
• zsh: https://www.zsh.org/mla/workers/2024/msg00633.html
• fish: kmod upstream integration fish-shell/fish-shell#10710

Some of the responses are better than others. In addition the quality and coverage are quite varying. I wonder if writing something from scratch won't be faster...

[evelikov]

Tl:Dr

• one has a custom license - SPDX MIT-Modern-Variant but not quite
• some responses aren't clear what/how to give attribution to existing authors/copyright holders
• one implementation has local cache, which expires after 1 week

[firasuke]

I'd like to point out that specifying --without-bashcompletiondir or --with-bashcompletiondir=no does not disable the installation of the completion scripts, and instead creates a no or ${DESTDIR}no directory which contains the completion scripts.

Is this behavior intended? Or should I open a separate issue to track this problem?

Thanks for your time.

[evelikov]

AFAICT disabling the shell completions was never supported with the autotools build.

For meson we got the means with 4670f4b and I don't plan on adding autotools equivalent, since the goal is to remove the latter with kmod v35 (as per the README).

Patches welcome though o/