Habitat Version Manager (hack)

habitat-version-manager.sh

#!/usr/bin/env bash
hab-get() {
  local download_url="https://api.bintray.com/content/habitat/stable/darwin/x86_64/hab-%24latest-x86_64-darwin.zip?bt_package=hab-x86_64-darwin"

  local tmpdir=$(mktemp -d)
  pushd $tmpdir
  echo "Moving to tmpdir $tmpdir"
  echo "Downloading and extracting hab binary"
  wget -qO- $download_url | tar xz --strip-components=1

  local dest_file=$(./hab --version | tr '[:blank:]\/' '-')
  echo "Installing $dest_file"
  mv hab ~/habitat/bin/$dest_file
  rmdir $tmpdir
  popd
}

hab-ls() {
  # Read the verison from the symlink
  local current_version=$(readlink ~/habitat/bin/hab | sed "s/.*\/hab-//" )
  # Read in all the files within the bin directory
  local found_versions=( ~/habitat/bin/* )

  echo
  echo "Habitat Versions Available"
  echo

  for version in ${found_versions[@]}; do
    # grab only the version numbers
    local a_version=$(echo $version | sed "s/.*\/hab-//")

    # This removes the symlink because it has path characters
    if [[ "$a_version" = *\/* ]] ; then
      continue
    fi

    if [ "$a_version" = "$current_version" ] ; then
      echo "* $a_version"
    else
      echo "  $a_version"
    fi

  done

  echo

}

hab-use() {
  local version=$1
  ln -sf ~/habitat/bin/hab-$version ~/habitat/bin/hab
}