download npm package script

dnpm.sh

#!/bin/bash

if [ -z $1 ]; then
    echo ""
    echo "Usage:"
    echo "    dnpm <package>"
    echo ""
    echo "examples:"
    echo "    dnpm express@4.0.0"
    echo ""
    exit 1
fi

echo "get package tarball ..."
url=$(npm view $1 dist.tarball)

if [ ! $? -eq 0 ]; then
    echo "[ERROR] unknown package $1"
    exit 1
fi

echo "downloading ${url} ..."

tarName="$1.tgz"

wget ${url} -O ${tarName}

if [ ! $? -eq 0 ]; then
    echo "[ERROR] can't download package $1"
    exit 1
fi

echo "unpacking ..."

dirName="${1/@/-}"

mkdir $dirName

if [ ! $? -eq 0 ]; then
    echo "[ERROR] cant mkdir $dirName"
    exit 1
fi


tar -C ${dirName} -xvzf ${tarName} --strip-components=1 package/

if [ ! $? -eq 0 ]; then
    echo "[ERROR] cant untar archive ${tarName}"
    exit 1
fi

rm ${tarName}

if [ ! $? -eq 0 ]; then
    echo "[ERROR] cant rm tarball ${tarName}"
    exit 1
fi

echo ""
echo "[DONE] $dirName"