mise (formally rtx) auto-switch version

.zshrc

function node_prompt_info() {
  mise current 2>/dev/null
}

# https://johnlindquist.com/automatically-switch-node-versions-based-on-your-packagejson-and-precmd-in-zsh/
# https://chat.openai.com/share/fbe51310-cde1-47fe-9d6c-f1d1ac017008
# https://chat.openai.com/share/6bfa3691-de5e-44ba-bd18-0274f69a5fdf
precmd(){
  if [ -f package.json ]
  then
    # Return early if .rtx.toml exists, as rtx handles this case
    if [ -f .rtx.toml ]; then
      return
    fi

    version_range=$(jq -r '.engines.node | select(.!=null)' package.json)
    if [ ! -z $version_range ]
    then
      node_versions=("${(f)$(mise ls-remote node)}")
      wanted_version=$(semver -r $version_range "${node_versions[@]}" | tail -n 1)
      current_version=$(mise current node)

      if [[ $current_version != $wanted_version ]]
      then
        echo "Switching to node@$wanted_version as specified in package.json"
        mise use node@$wanted_version
      fi
    fi
  fi
}

RPROMPT='$(node_prompt_info)'