Fish shell support

This tool is looking great so far and it woud be great if it would also support fish shell: https://github.com/fish-shell/fish-shell

I tried to simply modify the syntax to fish-shell: [[ -s "$HOME/.avn/bin/avn.sh" ]]; and source "$HOME/.avn/bin/avn.sh" # load avn but it is not working completely since fish also seems to have issues with the square brackets.

What exactly is the first bit doing? That might make it easier to translate to fish.

[ygormutti]

@Globegitter avn is unnecessary for fish users. You can simply hook to PWD changes and run your favorite node version manager directly (I use nvm with fisherman/nvm):

function __nvm_use_on_cd --on-variable PWD --description 'Use Node.js version specified by project'
    if test -e .nvmrc
       nvm use
       return
    end
    
    if test -e .node-version
       nvm use (cat .node-version)
       return
    end
end

[ljharb]

By what metric is a shell that’s not POSIX compliant popular?