Install nodejs, npm and lessc into your Python virtualenv

#!/bin/sh
#
# This script will download NodeJS, NPM and lessc, and install them into you Python
# virtualenv.
#
# Based on a post by Natim:
# http://stackoverflow.com/questions/8986709/how-to-install-lessc-and-nodejs-in-a-python-virtualenv

NODEJS="http://nodejs.org/dist/v0.8.3/node-v0.8.3.tar.gz"

# Check dependencies
for dep in gcc wget curl tar make; do
    which $dep > /dev/null || (echo "ERROR: $dep not found"; exit 10)
done

# Must be run from virtual env
if [ "$VIRTUAL_ENV" = "" ]; then
    echo "ERROR: you must activate the virtualenv first!"
    exit 1
fi

echo "1) Installing nodejs in current virtual env"
echo

cd "$VIRTUAL_ENV"

# Create temp dir
if [ ! -d "tmp" ]; then
    mkdir tmp
fi
cd tmp || (echo "ERROR: entering tmp directory failed"; exit 4)

echo -n "- Entered temp dir: "
pwd

# Download
fname=`basename "$NODEJS"`
if [ -f "$fname" ]; then
    echo "- $fname already exists, not downloading"
else
    echo "- Downloading $NODEJS"
    wget "$NODEJS" || (echo "ERROR: download failed"; exit 2)
fi

echo "- Extracting"
tar -xvzf "$fname" || (echo "ERROR: tar failed"; exit 3)
cd `basename "$fname" .tar.gz` || (echo "ERROR: entering source directory failed"; exit 4)

echo "- Configure"
./configure --prefix="$VIRTUAL_ENV" || (echo "ERROR: configure failed"; exit 5)

echo "- Make"
make || (echo "ERROR: build failed"; exit 6)

echo "- Install "
make install || (echo "ERROR: install failed"; exit 7)


echo
echo "2) Installing npm"
echo
curl http://npmjs.org/install.sh | sh || (echo "ERROR: install failed"; exit 7)


echo
echo "3) Installing lessc with npm"
echo
npm install less -g || (echo "ERROR: lessc install failed"; exit 8)

echo "Congratulations! lessc is now installed in your virtualenv"