ntest.sh

#!/bin/bash 

# check if the users system is windows, as N is not supported
if [[ "$OSTYPE" == 'msys' ]] || [[ "$OSTYPE" == 'cygwin' ]]; then
  echo "n is not supported on Windows systems"
else 

	# check if we want to fix broken permissions
	if [ ! -w "/usr/local/n/versions" ]; then
		echo "/usr/local/n/versions is not writable"
		read -p "would you like to fix permissions? (y/n) " -n 1 -r
		if [[ $REPLY =~ ^[Yy]$ ]]; then
			printf '\n'
			sudo chown -R `whoami` /usr/local/n/versions
			sudo chmod u+w /usr/local/n/versions
		else
			echo -e '\nYou will have to use sudo every time you run n\n'
		fi
	fi

	install() {
	if [ ! -w "/usr/local/n/versions" ]; then
		sudo n $@
	else 
		n $@
	fi
	}


  # check for n current versions
  # change path depending on custom path set or not
  if [ -z ${N_PREFIX+x} ]; then
    vers=`find /usr/local/n/versions/node -type d | sed 's|'/usr/local/n/versions'/||g' | egrep "/[0-9]+\.[0-9]+\.[0-9]+$" | sort -k 1,1 -k 2,2n -k 3,3n -t . | awk -F/ '{print $2}'`
  else 
    vers=`find $N_PREFIX/n/versions/node -type d | sed 's|'/usr/local/n/versions'/||g' | egrep "/[0-9]+\.[0-9]+\.[0-9]+$" | sort -k 1,1 -k 2,2n -k 3,3n -t . | awk -F/ '{print $2}'`
  fi
	
	echo "-Checking installed Node.js Versions-"
  # print to screen current installed versions
  echo -e "Installed versions:"
  if [ -z ${vers+x} ]; then
	  echo "$vers"
  else
    echo "No versions are installed through n..."
    vers=`node -v | cut -d v -f2`
    echo "node -v : $vers" 
  fi
  printf '\n'

  # variables check for versions available through n
  latest=`n --latest`
  stable=`n --stable`
  lts=`n --lts`

	echo "-Checking available node.js versions-"
  echo "Latest is:  $latest"
  echo "Stable is:  $stable"
  echo "LTS is:     $lts"

  printf '\n'
	sleep 2

  # ask if user wants n latest or n stable
	# since vers is stored in a variables of all versions installed,
	# check from highest version to lowest
  case $vers in

    *$latest*)
      echo "You are currently on Latest version" ;;

    *$stable*)
      echo "You are currently on Stable version" 

      printf '\n'
      echo "-Which node.js version would you like to install?-"
      read -p "( Latest [L], LTS [T] ) " -n 1 -r
      printf '\n'
        if [[ $REPLY =~ ^[Ll]$ ]]; then
          install latest
        elif [[ $REPLY =~ ^[Tt]$ ]]; then
          install lts
        elif [[ ! $REPLY =~ ^[LlTt]$ ]]; then
          echo "Skipping node.js update through n"
        fi

      ;;
    *$lts*)
      echo "You are currently on LTS version" 
      
      printf '\n'
      echo "-Which node.js version would you like to install?-"
      read -p "( Latest [L], Stable [S] ) " -n 1 -r
      printf '\n'
        if [[ $REPLY =~ ^[Ll]$ ]]; then
          install latest
        elif [[ $REPLY =~ ^[Ss]$ ]]; then
          install stable 
        elif [[ ! $REPLY =~ ^[LlSs]$ ]]; then
          echo "Skipping node.js update through n"
        fi

      ;;

    *)
      if (( $(echo "$vers $latest" |  awk '{print ($1 > $2)}') )); then
        echo "How in the hell do you have this version?"
      else
        echo "You are currently on an outdated version" 
      fi

      printf '\n'
      echo "-Which node.js version would you like to install?-"
      read -p "( Latest [L], Stable [S], LTS [T] ) " -n 1 -r
      printf '\n'
        if [[ $REPLY =~ ^[Ll]$ ]]; then
          echo "installing Latest"
          install latest 
        elif [[ $REPLY =~ ^[Ss]$ ]]; then
          echo "Install Stable"
          install stable
        elif [[ $REPLY =~ ^[Tt]$ ]]; then
          echo "Install LTS"
          install lts
        elif [[ ! $REPLY =~ ^[LlSsTt]$ ]]; then
          echo "Skipping node.js update through n"
        fi

      ;;
  esac # end version compare and update check

fi # end windows check

# set a windows only option? 
# scoop and chocolatey install node
# need a check for chocolatey and scoop