Shell.nix load completions

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1

For some reasons https://github.com/NixOS/nixpkgs/blob/53f793d51fb233456941481ea22b761bb4960312/pkgs/development/tools/skaffold/default.nix#L26-L30 is doing nothing in my nix shell, i also was trying to put into the shellHook:

  • . <(skaffold completions $(basename $SHELL))
  • . <(skaffold completions zsh)

I also tried to put them in direnv’s .envrc.

All to no avail. When I execute those exact commands in the final shell, it works.

  • Why is this? What am I not seeing?
  • How can I make it work, so that nix-shell does get with completions?
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2

for bash, doing something like:

source <(kubectl completion bash)

works

I’m not sure about zsh.

It would be nice if nix-shell could auto-detect shell completion from inputs though…

EDIT:
for mkShell you can pass a Shellhook

mkShell {
  ....
  shellHook = ''
    . <(skaffold completions $(basename $SHELL))
  '';
}

The shellHook should execute each time you do nix-shell

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3

Thanks for giving this a try, Jon! :+1:

  • Running manually works
  • Running from shellHook doesn’t
  • which might be related to why the built-in linked postInstall hook misses out as well.

EDIT: I think the shell hook is not actually executed in the target shell. That might explain it.

4

installShellCompletion hooks will install it for nixos’s environment.systemPackages and similar paradigms to check for paths to link to, they do not automatically get executed with mkShell

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5

How did @burke solve this for runix?

6

Not sure.

runix isn’t a package, nor a command found in nixos:

[17:39:14] jon@jon-desktop /home/jon/projects/nixpkgs (master)
$ command-not-found runix
runix: command not found
[17:39:19] jon@jon-desktop /home/jon/projects/nixpkgs (master)
$ nix-build -A runix
error: attribute 'runix' in selection path 'runix' not found
7

Haha, I like your reflexes!

It has been accidentally published just enough for google to catch it up - funny!

https://github.com/Shopify/runix/ - private repository at the time of writing.

image

But is presented here:

There are also a couple of posts in this forum.

8

looking at the video, there’s probably something which will bring in a shellhook which will add the shell completion to the current shell session.

But I can’t be certain because there’s no code :slight_smile:

9

It looks like there is a solution under way:

10

you should be able to pass the dependencies through inputsFrom and have them execute their shellhook. However, this has other implications, as I think it will propagate all of their dependencies into your shell as well.

11

That might work as well, I think, though I’m gonna rely on zimbatm’s witchery. :wink:

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12

@blaggacao if you are using direnv shellhooks that source scripts won’t be present in ZSH.
That’s because direnv just exports the environment and saves it to a file & reloads it when you enter.

It doesn’t end up re-executing the shellHook commands.

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13

Oh thank you that also explains other observations I had. Thx!

14

instead of direnv @burke also uses GitHub - Shopify/shadowenv: reversible directory-local environment variable manipulations but honestly it’s for their more exotic usecase since they pre-generate the lisp code.

I find direnv much simpler for smaller projects.
Also the nix-community improvements are amazing GitHub - nix-community/nix-direnv: A fast, persistent use_nix/use_flake implementation for direnv [maintainer=@Mic92 / @bbenne10]

15

There’s now two PRs related to this:
Adding /share folders to XDG_DATA_DIRS: https://github.com/NixOS/nixpkgs/pull/103501
Adding separate sourceInputDerivationHook for mkShell: sourceInputCompletionHook: init by jonringer · Pull Request #104225 · NixOS/nixpkgs · GitHub

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