Consider adding command for preparing shell in light of homebrew not allowing instructions in caveats section

[zimme]

It would be nice if there was a command like fnm env [--prepare-shell=bash|zsh|fish|powershell] that would in the case of fish add a file to ~/.config/fish/conf.d/fnm.fish with fnm evn | source as content.

With this the homebrew installer could do everything needed to install fnm and the instructions to setup fnm properly would be simpler in general.

[zimme]

The command could also be fnm prepare-shell [--shell=bash|zsh|fish|powershell] to align with fnm completions.

[Schniz]

Sounds very good. And it will make the installation script much simpler by relying less on Bash 😄