#!/bin/bash

# Predefined links and files. Note: LTS may not be latest LTS
export NODE_STABLE=http://nodejs.org/dist/node-latest.tar.gz
export NODE_LTS=https://nodejs.org/dist/latest-v4.x/node-v4.2.2.tar.gz
export RC_BASH=~/.bashrc
export RC_PROFILE=~/.profile

# Settings
export NODE_VER=$NODE_LTS
export RC_FILE=$RC_BASH
export UNSET_MANPATH=true # false if MANPATH already modifed elsewhere
export USE_GROUP=false # change group ownership
export GROUP_NAME=node # sudo groupadd $GROUP_NAME beforehand

# Download Node into current directory and extract
mkdir node-install
cd node-install
curl $NODE_VER | tar xz --strip-components=1

# Export env variables and add to PATH
echo 'export NODE_DIR=/usr/local/node' >> $RC_FILE
echo 'export NPM_PACKAGES="$NODE_DIR/npm-packages"' >> $RC_FILE
echo 'export NODE_PATH="$NPM_PACKAGES/lib/node_modules:$NODE_PATH"' >> $RC_FILE
echo 'export PATH="$PATH:$NPM_PACKAGES/bin:$NODE_DIR/bin"' >> $RC_FILE

# MANPATH
if [ "$UNSET_MANPATH" == "true" ]; then
    echo 'unset MANPATH' >> $RC_FILE
fi
echo 'export MANPATH="$NPM_PACKAGES/share/man:$MANPATH"' >> $RC_FILE

# Source
source $RC_FILE

# Make directories for Node and npm global packages
sudo mkdir $NODE_DIR
sudo mkdir $NPM_PACKAGES

# Take ownership
if [ "$USE_GROUP" == "false" ]; then
    sudo chown `whoami` $NODE_DIR
else
    sudo chgrp $GROUP_NAME $NODE_DIR
fi

# Configure and install
./configure --prefix=$NODE_DIR
# This will take a while, 20-30 mins or so. Building V8!
make install