--stdin: command not found on v0.6 darwin

Issue description

I'm trying this plugin out, but ran to an issue upon running nix-shell
Output: /private/tmp/nix-shell-20000-0/rc: line 4: --stdin: command not found
I tried to find the file, it doesn't exist

⚡➜ find /private/tmp/nix-shell*
/private/tmp/nix-shell-10174-0
/private/tmp/nix-shell-10174-0/.attr-0
/private/tmp/nix-shell-10174-0/rc
/private/tmp/nix-shell-10469-0
/private/tmp/nix-shell-10469-0/.attr-0
/private/tmp/nix-shell-10469-0/rc
/private/tmp/nix-shell-10590-0
/private/tmp/nix-shell-10590-0/.attr-0
/private/tmp/nix-shell-10590-0/rc
/private/tmp/nix-shell-10953-0
/private/tmp/nix-shell-10953-0/.attr-0
/private/tmp/nix-shell-10953-0/rc
/private/tmp/nix-shell-11399-0
/private/tmp/nix-shell-11399-0/.attr-0
/private/tmp/nix-shell-11399-0/rc
/private/tmp/nix-shell-93229-0
/private/tmp/nix-shell-93229-0/.attr-0
/private/tmp/nix-shell-93229-0/rc

Did you install the plugin according to the installation guide? If not, does the issue persist if you do install it that way?
Yes, at first, my installation was with zsh-zap, but after that, I changed to plain zsh but still doesn't work

Steps to reproduce

install based on the plain zsh instructions
create shell.nix in a project, i.e

{ pkgs ? import <nixpkgs> {} }:

with pkgs;

mkShell {
  buildInputs = [ cowsay ];
}

run nix-shell

Technical details

Please run the following commands and paste the results:

command nix-shell -p nix-info --run "nix-info -m"

 - system: `"x86_64-darwin"`
 - host os: `Darwin 22.4.0, macOS 10.16`
 - multi-user?: `yes`
 - sandbox: `no`
 - version: `nix-env (Nix) 2.15.0`
 - channels(root): `"nixpkgs"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixpkgs`

zsh --version
zsh 5.9 (x86_64-apple-darwin22.4.0)

I changed to 0.5 and it worked again, I think this line leads to the problem on my machine, any input?

zsh-nix-shell/nix-shell.plugin.zsh

Line 64 in 1834762

NIX_EXECUTING_SHELL=$(readlink /proc/$$/exe) \

Same here. I am on ARM darwin. Running readlink /proc/$$/exe produces no output. I would suggest changing the name of the issue, though, it is confusing right now.

nix-shell not found is not really what's happening, the error is --stdin: command not found

oh yeah, I figured as I don't see temp nix-shell, I changed to that

So, 0.6 is broken on darwin because there is no /proc on MacOS. @chisui

Would it make sense to simply do which zsh or readlink -f $(which zsh)?

This plugin is developed primarily for use in NixOs. In NixOs you don't have to expose your shell through PATH so which zsh might fail. For Mac support I have to rely on the community since I don't have access to a Mac machine. I will try to find an alternative to /proc for Mac. PRs are more than welcome on this issue though.

@howarddo2208 @gshpychka does ps -p $$ -o command | tail +2 print the path to the currently running zsh? If so I could use that for both Mac and linux.

@howarddo2208 @gshpychka does ps -p $$ -o command | tail +2 print the path to the currently running zsh? If so I could use that for both Mac and linux.

No, it prints "-zsh" on my machine.

same here

An if you use bsd style arguments? ps p $$ o command

An if you use bsd style arguments? ps p $$ o command

That doesn't work: ps: illegal argument: o

How's this:

lsof -p $$ | awk '$4=="txt" {print $9}' | head -n 1 ?

I pushed an potential fix to master. Let me know if that fixes your this issue. If it does, I'll create a new release

Hm, no, same error. I guess the detection logic isn't working as expected?

With the help of a friends Mac I debugged parts of the script. Does the current version on master work now?

yeah, it works now, thank you!