Nixpkgs: No output defined for shell (bash/zsh/fish) completion files

[offlinehacker]

Issue description

I want to add several completion files for several packages, and don't know in which output should i place completion files. The best one seems doc output, or should i introduce new output for shell completion files?

@edolstra @vcunat @dezgeg

[offlinehacker]

I would introduce completions output that would have autocompletions. We also have man output, so this does seem similar to the way how we currently do things.

[dezgeg]

So far we've put it in bin. I don't think there's much need to have a separate output for that since the completion files are quite small, I think.

[offlinehacker]

Cool, so let's have bin output if it's used by derivation, out otherwise. I will open a new issue for documenting this.

[vcunat]

For that I recommend ${!outputBin} – that's the output where binaries are to be put.