Error while trying to use the -zsh-completion-script

[PierreR]

I am probably doing something wrong but I have not been able to make zsh completion work:

λ ~ → nix-shell -p dhall --run zsh
λ ~ → echo $0
zsh
λ ~ → source <(dhall            --zsh-completion-script dhall)
/proc/self/fd/11:compadd:24: can only be called from completion function

I have also tried to put this line in shellHook but then I have got:

/dev/fd/63: line 26: print: command not found
/dev/fd/63: line 27: compadd: command not foun

PS: The bash completion script is working fine.

Thanks for your help.

[Gabriella439]

Apparently we're not loading the zsh completion correctly. zsh is not designed to source completion scripts. I'll have a fix up later today.

[Gabriella439]

Fix is up here: #1829

[PierreR]

@Gabriel439 Thanks.

Do you know if there is a way to reload zsh with the completion enabled without launching a new one with zsh -i ?

Unlike nix-shell, direnv is using the shell of the user. Creating a new one seems to cause problems with direnv.

If I just remove the line zsh -i I don't get any completion.

[PierreR]

I guess this is more a direnv issue than anything else:
direnv/direnv#443

[Gabriella439]

@PierreR: There is not a way to avoid the zsh -i when using nix-shell, because nix-shell switches the shell to bash, regardless of what the original shell was. I think it might be worth making a request upstream to have nix-shell support shells other than bash

[PierreR]

@Gabriel439 sure but that's not the case with direnv. direnv is going to read shell.nix and keep the user shell (zsh for me).

At this point I really believe it is more a direnv problem than anything else.

I believe your fix is quite valid for nix-shell usage in general.

I will probably try to fix this by creating a dhall nix derivation (or will upload _dhall in my .zsh). I even might go with bash instead.

Thanks for your help !

[Gabriella439]

@PierreR: You're welcome! 🙂