upgradenode

#!/usr/bin/env bash

declare -r esc=$'\033'
declare -r c_reset="${esc}[0m"
declare -r c_red="${esc}[31m"

ask() {
  read -r -p "$1 " -n1 ans
  echo
  [[ "${ans^}" == Y ]]
}

err() {
  printf "${c_red}%s${c_reset}\n" "$*" >&2
}

die() {
  [[ -n "$1" ]] && err "$1"
  exit 1
}

has() {
  local verbose=false
  if [[ $1 == '-v' ]]; then
    verbose=true
    shift
  fi
  for c in "$@"; do c="${c%% *}"
    if ! command -v "$c" &> /dev/null; then
      [[ "$verbose" == true ]] && err "$c not found"
      return 1
    fi
  done
}

confirm_cmd() {
  if ask "$*?"; then
    "$@"
  fi
}

check_hash() {
  file="$1"
  latest="$2"
  remotehash=$(grep "${file##*/}" <<< "$latest")
  remotehash=${remotehash%% *}
  localhash=$(sha256sum "$file")
  localhash=${localhash%% *}
  if [[ "$remotehash" != "$localhash" ]]; then
    err 'hash mismatch!';
    die 1
  fi
}

has -v curl || die

declare path="$HOME"
if [[ -d $1 ]]; then
  path=$1
fi

cputype=$(uname --machine)
echo 'checking latest node version...'
latest=$(curl -sL 'https://nodejs.org/dist/latest/SHASUMS256.txt')
name=$(grep -m1 -o -P 'node-v[^-]+-linux-x'"${cputype:(-2)}" <<< "$latest")

if has node; then
  current=$(node --version)
  newver=$(grep -oP 'v[0-9]+\.[0-9]+\.[0-9]+' <<< "$name")
  if [[ "${current}" == "${newver}" ]]; then
    echo 'up-to-date'
    exit 0
  else
    echo "${current} reported, ${newver} available"
  fi
fi

declare file="${path}/${name}.tar.xz"
if [[ ! -e "${file}" ]]; then
  confirm_cmd curl -LO "https://nodejs.org/dist/latest/${name}.tar.xz" -o "$file"
  [[ -e "$file" ]] && check_hash "$file" "$latest"
fi

if [[ ! -e "${file}" ]]; then
  echo "$path"
  if [[ -e "${path}/node*.tar.xz" ]]; then
    file=$(realpath "${path}node*.tar.xz" | sort -h | head -n1)
  fi
  echo "$file"
fi

if [[ -e "$file" ]]; then
  echo "installing $file"
  mkdir -p "${HOME}/build"
  tar -x -f "$file" -C "${HOME}/build/" || die
  mv "${HOME}/build"/node*/bin/* "${HOME}/.local/bin/"
  rm -fr "${HOME}/.local"/{lib/node_modules,include/node}
  cp -R "${HOME}/build/node"*/{lib,share,include} "${HOME}/.local/"
  rm -fr "${HOME}/build/$name"
fi