IOJS_VERSION=v0.0.0
IOJS_DIR=$HOME/.iojs

iojs_install() {
  iojs_setup
  iojs_download
  iojs_assemble
  iojs_teardown
}

iojs_setup() {
  echo '[1/3] Getting latest version'
  IOJS_VERSION=v${1:-$(curl -s https://iojs.org/dist/index.json | sed -e 's/^.*"version":"\([^"]*\)".*$/\1/' | head -n 2 | tail -n -1 | cut -c 2-)}

  mkdir -p $IOJS_DIR && rm -rf $IOJS_DIR/*
}

iojs_download() {
  echo '[2/3] Downloading io.js' ${IOJS_VERSION}
  curl -s https://iojs.org/dist/${IOJS_VERSION}/iojs-${IOJS_VERSION}-linux-x64.tar.gz | tar zx -C $IOJS_DIR --strip-components=1
}

iojs_assemble() {
  echo '[3/3] Adding binaries to PATH'
  printf '%s\n' '' '# io.js environment' "export PATH=$IOJS_DIR/bin:\$PATH" \
  "export NODE_PATH=$IOJS_DIR/lib/node_modules" >> ~/.bashrc

  . ~/.bashrc
}

iojs_teardown() {
  echo '====> Done'
  printf '%s\n' '' "iojs -v: $(iojs -v)" "npm -v: $(npm -v)"
  unset -f iojs_install iojs_setup iojs_download iojs_assemble iojs_teardown IOJS_VERSION IOJS_DIR
}

iojs_install