bash automatic nvm node version switcher

.autonvm

##################################################
# Prerequisites
# This script only works with nvm
# Please install nvm first https://github.com/nvm-sh/nvm
#-------------------------------------------------
# Installation
# Copy this script into your home folder
# add "source ~/.autonvm" top the bottom of your .bashrc or .bash_profile
#-------------------------------------------------
# Usage
# 1. create a .node-version file in the project folder
# 2. add node version number into the .node-version file
# the File must only contain the node version number!!!
# 3. have fun coding :)
# 
# or use this: echo "YOUR_NODE_VERSION">.node-version
##################################################

versionLookup(){
  path=$(pwd)
  while [[ "$path" != "" && ! -e "$path/$1" ]]; do
    path=${path%/*}
  done
  echo "$path"
}

autonvm(){
  cd "$@";
  # Lookup version file .node-version
  node_version_path=$(versionLookup .node-version | tr -d '[:space:]')

  # .node-version File not found, try to use default node version
  if [[ ! $node_version_path = *[^[:space:]]* ]]; then
    declare node_default;
    node_default=$(nvm version default);

    # no default node version found
    if [[ $node_default == "N/A" ]]; then
      echo "No default version available. Check nvm ls or do nvm alias default xxxx";
    fi
  
  # .node-version File found
  elif [[ -s $node_version_path/.node-version && -r $node_version_path/.node-version ]]; then
    
    # get node version from .node-version file
    declare nvm_version
    nvm_version=$(echo $(<"$node_version_path"/.node-version) | tr -d '\r' | tr -d '\n')

    # check if node version is available in nvm
    declare nvm_check_version
    nvm_check_version=$(nvm ls --no-colors "$nvm_version" | tail -1 | tr -d '\->*' | tr -d '[:space]')

    # node version not available in nvm
    if [[ $nvm_check_version == "N/A" ]]; then
      echo "Node version not installed."

    # node version available, switch node version
    elif [[ $(nvm current) != "$nvm_check_version" ]]; then
      nvm use $nvm_version
    fi
  fi
}
alias cd='autonvm'