Just to clarify, you want completion for commands within nix-shell not for nix-shell itself? (because there definitely is at least ZSH support for completion of nix-* commands.

I wonder if we could have an output called something like "completion" that would use paths /share/bash-completion/completions and /share/zsh/site-functions? Obviously it wouldn't be a huge win for closure sizes, but would make things a little cleaner.

I have this in my .bashrc that should work:

# Check whether we're running a version of Bash that has support for
# programmable completion. If we do, enable all modules installed in
# the system (and user profile).
if shopt -q progcomp &>/dev/null; then
    . "@bash-completion@/etc/profile.d/bash_completion.sh"
    nullglobStatus=$(shopt -p nullglob)
    shopt -s nullglob
    for m in "@out@/etc/bash_completion.d/"* "@out@/share/bash-completion/completions/"*; do
        . $m
    done
    eval "$nullglobStatus"
    unset nullglobStatus p m
fi

You should be able to use that in nix-shell I think (replacing @out@ with the environment and @bash-completion@ with wherever pkgs.bash-completion is).

The problem is it's Bash-only. ZSH is alot easier:

# Tell zsh how to find installed completions
fpath+=(@out@/share/zsh/site-functions @out@/share/zsh/$ZSH_VERSION/functions)

If you want those to work "by default" I think they would need to be in nix-profile: https://github.com/NixOS/nix/blob/fb2dd3210072a03526e881cd2547cf4c2df4ba52/scripts/nix-profile.sh.in#L84. Of course the .profile is supposed to be for all

Uh oh!

Completion support in nix-shell #26031

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