#!/bin/bash
# Usage: curl -fsSL https://github.com/github/hub/raw/master/script/get | bash -s <HUB_VERSION>
#
# Downloads the hub binary into `bin/hub` within the current directory.

set -e

latest-version() {
  curl -fsi https://github.com/github/hub/releases/latest | awk -F/ 'tolower($1) ~ /^location:/ {print $(NF)}'
}

HUB_VERSION="${1#v}"
if [ -z "$HUB_VERSION" ]; then
  latest=$(latest-version) || true
  [ -n "$latest" ] || latest="v2.14.1"
  cat <<MSG >&2
Error: You must specify a version of hub via the first argument. Example:
  curl -L <script> | bash -s ${latest#v}
MSG
  exit 1
fi

ARCH="amd64"
OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
case "$OS" in
mingw* | msys* ) OS=windows ;;
esac

download() {
  case "$OS" in
  windows )
    zip="${1%.tgz}.zip"
    curl -fsSLO "$zip"
    unzip "$(basename "$zip")" bin/hub.exe
    rm -f "$(basename "$zip")"
    ;;
  darwin )
    curl -fsSL "$1" | tar xz --strip-components=1 '*/bin/hub'
    ;;
  * )
    curl -fsSL "$1" | tar xz --strip-components=1 --wildcards '*/bin/hub'
    ;;
  esac
}

download "https://github.com/github/hub/releases/download/v$HUB_VERSION/hub-$OS-$ARCH-$HUB_VERSION.tgz"

bin/hub version
if [ -z "$GITHUB_TOKEN" ]; then
  cat <<MSG >&2
Warning: We recommend supplying the GITHUB_TOKEN environment variable to avoid
being prompted for authentication.
MSG
fi