Derive $node_install_path from $NODE_PATH

setup-node-ubuntu.bash

@@ -1,3 +1,11 @@
+#!/bin/bash
+
+if [ -z "$NODE_PATH" ]; then
+  node_install_path=$(dirname $(dirname $NODE_PATH))
+else
+  node_install_path=$PREFIX/usr/local
+fi
+
 NODEJS_VER=${1}
 NODEJS_VERT=$(echo ${NODEJS_VER} | cut -c 2- | cut -d '.' -f1)
 
@@ -45,9 +53,9 @@ if [ -n "${NODEJS_VER}" ]; then
   mkdir -p ${NODEJS_UNTAR}/
   tar xf ${NODEJS_LOCAL} -C ${NODEJS_UNTAR}/ --strip-components=1
   rm ${NODEJS_UNTAR}/{LICENSE,CHANGELOG.md,README.md}
-  sudo rsync -a "${NODEJS_UNTAR}/" /usr/local/
+  sudo rsync -a "${NODEJS_UNTAR}/" "$node_install_path"
 
 
-  sudo chown -R $(whoami) /usr/local/lib/node_modules/
-  sudo chown $(whoami) /usr/local/bin/
+  sudo chown -R $(whoami) "$node_install_path/lib/node_modules/"
+  sudo chown $(whoami) ""$node_install_path"/bin/"
 fi