auto update npm package when git submodule update

post-checkout

#!/bin/sh

# exit when checkout a file
[ "$3" == "0" ] && exit

cd gulp

echo "Checking npm modules"

npm ls > /dev/null && {
    echo "All package was fresh"
} || {
    echo "Running 'npm install' to install missed package" >&2
    npm install --loglevel error && npm prune
}