setup-from-github-release

#!/usr/bin/env bash

set -euo pipefail

command_exists() {
  type "${1}" >/dev/null 2>&1
}

select_github_release() {
  local -r repo="${1}"
  local -n return_variable="${2}"

  local api_url="https://api.github.com/repos/${repo}/releases"
  local api_response="$(curl -s "${api_url}")"

  local releases=()
  local -A asset_urls_by_release=()

  for encoded_payload in $(echo "${api_response}" | jq -r '.[] | { prerelease, tag_name, assets: (.assets | map(.browser_download_url)) } | @base64'); do
    local payload="$(echo "\"${encoded_payload}\"" | jq -r '. | @base64d')"

    local release="$(echo "${payload}" | jq -r '"\( if .prerelease then "🚀" else "📦" end ) \( .tag_name )"')"
    local asset_urls=($(echo "${payload}" | jq -r '.assets | .[]'))

    releases+=("${release}")
    asset_urls_by_release["${release}"]="${asset_urls[@]}"
  done

  local -A asset_url_by_name=()

  echo "Select Release:"
  PS3='> '
  select release in "${releases[@]}"; do
    if [[ -n "${release}" ]]; then
      local asset_urls=(${asset_urls_by_release[${release}]})

      if [[ "${#asset_urls[@]}" = "0" ]]; then
        echo "No assets available!"
      else
        for asset_url in "${asset_urls[@]}"; do
          asset_url_by_name["$(basename "${asset_url}")"]="${asset_url}"
        done
        break
      fi
    else
      echo "Invalid selection!"
    fi
  done

  local asset_url

  echo "Select Asset: "
  PS3='> '
  select asset in "${!asset_url_by_name[@]}"; do
    if [[ -n "${asset}" ]]; then
      asset_url="${asset_url_by_name[${asset}]}"
      break
    else
      echo "Invalid selection!"
    fi
  done

  return_variable="${asset_url}"
}

pick_file() {
  local -r directory="${1}"
  local -n return_variable="${2}"

  local -r files=($(find "${directory}" -type f))

  echo "Pick the executable binary:"
  PS3='> '
  select file in "${files[@]}"; do
    if [[ -f "${file}" ]]; then
      return_variable="${file}"
      break
    fi
  done
}

use_binary() {
  local -r filepath="${1}"
  local -r filename="$(basename "${filepath}")"
  chmod u+x "${filepath}"
  sudo mv "${filepath}" "/usr/local/bin/${filename}"
}

handle_archive() {
  local -r filepath="${1}"
  local -r directory="/tmp/setup-from-github-release"

  rm -rf "${directory}"
  mkdir -p "${directory}"

  local -r filename="$(basename "${filepath}")"

  echo ""
  echo "Extracting: ${filename}"
  echo ""

  case "${filename}" in
    *.zip)
      unzip -o -q "${filepath}" -d "${directory}"
      ;;
    *.tar.gz)
      tar -xzf "${filepath}" -C "${directory}"
      ;;
    *)
      echo "Unsupported filetype!"
      exit 1
  esac

  local file
  pick_file "${directory}" file
  use_binary "${file}"
}

manual_handle() {
  local -r filepath="${1}"

  local -r directory="$(dirname "${filepath}")"
  local filename="$(basename "${filepath}")"

  local -A operations=()
  operations['Rename']='rename'
  operations['Use as Binary']='use_as_binary'
  operations['Nothing']='nothing'

  echo "What do you want to do with the file: ${filename}"
  PS3="Operation > "
  select operation in "${!operations[@]}"; do
    if [[ -n "${operation}" ]]; then
      case "${operations[${operation}]}" in
        rename)
          local new_filename
          read -p "New Name [${filename}]: " new_filename
          new_filename="${new_filename:-"${filename}"}"
          mv "${directory}/${filename}" "${directory}/${new_filename}"
          filename="${new_filename}"
          ;;
        use_as_binary)
          use_binary "${directory}/${filename}"
          break
          ;;
        nothing)
          exit 1
          ;;
      esac
    else
      echo "Invalid selection!"
    fi
  done
}

handle_downloaded_package() {
  local -r filename="${1}"

  case "${filename}" in
    *.zip)
      handle_archive "${filepath}"
      ;;
    *.tar.gz)
      handle_archive "${filepath}"
      ;;
    *.deb)
      sudo dpkg -i "${filepath}"
      ;;
    *)
      manual_handle "${filepath}"
      ;;
  esac
}

download_package() {
  local -r url="${1}"
  local -r filepath="${2}"

  wget --continue --quiet --show-progress --timestamping "${url}" -O "${filepath}"
}

setup_from_github_release_interactive() {
  local -r repo="${1}"

  local url
  select_github_release "${repo}" url

  local -r filename="$(basename "${url}")"
  local -r filepath="/tmp/${filename}"

  echo ""
  echo "Downloading: ${url}"
  echo ""
  download_package "${url}" "${filepath}"

  echo ""
  echo "Installing..."
  echo ""
  handle_downloaded_package "${filename}"

  echo ""
  echo "Done!"
  echo ""
}

setup_from_github_release_non_interactive() {
  local -r repo="${1}"
  local -r url_pattern="${2}"

  local -r url=$(curl -s "https://api.github.com/repos/${repo}/releases/latest" | jq -r --arg pattern "${url_pattern}" '.assets | map(.browser_download_url) | map(select(. | test($pattern)))[0]')

  local -r filename="$(basename "${url}")"
  local -r extension="${filename##*.}"

  local -r filepath="/tmp/${filename}"

  echo ""
  echo "Downloading: ${url}"
  echo ""
  download_package "${url}" "${filepath}"

  echo ""
  echo "Installing..."
  echo ""
  handle_downloaded_package "${filename}"

  echo ""
  echo "Done!"
  echo ""
}

if ! command_exists jq; then
  echo "Missing dependency: jq"
  exit 1
fi

if [[ "$#" == "1" ]]; then
  setup_from_github_release_interactive "$@"
elif [[ "$#" == "2" ]]; then
  setup_from_github_release_non_interactive "$@"
else
  echo "Sorry mate! Something went wrong!"
  exit 1
fi