#!/usr/bin/env bash set -euo pipefail ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"TOOLS_DIR="${ROOT_DIR}/.build/lint-tools"BIN_DIR="${TOOLS_DIR}/bin" SWIFTFORMAT_VERSION="0.59.1"SWIFTLINT_VERSION="0.63.2" SWIFTFORMAT_SHA256_DARWIN="8b6289b608a44e73cd3851c3589dbd7c553f32cc805aa54b3a496ce2b90febe7"SWIFTLINT_SHA256_DARWIN="c59a405c85f95b92ced677a500804e081596a4cae4a6a485af76065557d6ed29" log() { printf '%s\n' "$*"; }fail() { printf 'ERROR: %s\n' "$*" >&2; exit 1; } sha256_value() {  local path="$1"  if command -v shasum >/dev/null 2>&1; then    shasum -a 256 "$path" | awk '{print $1}'    return 0  fi  if command -v sha256sum >/dev/null 2>&1; then    sha256sum "$path" | awk '{print $1}'    return 0  fi  fail "Missing shasum/sha256sum."} download_file() {  local url="$1"  local out="$2"  curl -fL --retry 3 --retry-connrefused --retry-delay 2 -o "$out" "$url"} install_zip_binary() {  local label="$1"  local url="$2"  local expected_sha="$3"  local binary_name="$4"   local tmp_zip  tmp_zip="$(mktemp -t "${label}.XXXX")"  local tmp_dir  tmp_dir="$(mktemp -d -t "${label}.XXXX")"   log "==> Downloading ${label}"  download_file "$url" "$tmp_zip"   local actual_sha  actual_sha="$(sha256_value "$tmp_zip")"  if [[ -n "$expected_sha" && "$actual_sha" != "$expected_sha" ]]; then    rm -f "$tmp_zip"    rm -rf "$tmp_dir"    fail "${label} SHA256 mismatch (expected ${expected_sha}, got ${actual_sha})"  fi   unzip -q "$tmp_zip" -d "$tmp_dir"   local extracted_path=""  if [[ -f "${tmp_dir}/${binary_name}" ]]; then    extracted_path="${tmp_dir}/${binary_name}"  else    extracted_path="$(find "$tmp_dir" -type f -name "$binary_name" | head -n 1 || true)"  fi   if [[ -z "$extracted_path" || ! -f "$extracted_path" ]]; then    rm -f "$tmp_zip"    rm -rf "$tmp_dir"    fail "${label} binary '${binary_name}' not found in archive"  fi   install -m 0755 "$extracted_path" "${BIN_DIR}/${binary_name}"   rm -f "$tmp_zip"  rm -rf "$tmp_dir"} mkdir -p "$BIN_DIR" if [[ -x "${BIN_DIR}/swiftformat" && -x "${BIN_DIR}/swiftlint" ]]; then  if [[ "$("${BIN_DIR}/swiftformat" --version 2>/dev/null || true)" == "${SWIFTFORMAT_VERSION}" ]] \    && [[ "$("${BIN_DIR}/swiftlint" version 2>/dev/null || true)" == "${SWIFTLINT_VERSION}" ]]  then    log "==> Lint tools already installed (${SWIFTFORMAT_VERSION}, ${SWIFTLINT_VERSION})"    exit 0  fifi OS="$(uname -s)"ARCH="$(uname -m)" case "$OS" in  Darwin)    SWIFTFORMAT_URL="https://github.com/nicklockwood/SwiftFormat/releases/download/${SWIFTFORMAT_VERSION}/swiftformat.zip"    SWIFTLINT_URL="https://github.com/realm/SwiftLint/releases/download/${SWIFTLINT_VERSION}/portable_swiftlint.zip"     install_zip_binary "SwiftFormat ${SWIFTFORMAT_VERSION}" "$SWIFTFORMAT_URL" "$SWIFTFORMAT_SHA256_DARWIN" "swiftformat"    install_zip_binary "SwiftLint ${SWIFTLINT_VERSION}" "$SWIFTLINT_URL" "$SWIFTLINT_SHA256_DARWIN" "swiftlint"    ;;  Linux)    case "$ARCH" in      x86_64)        SWIFTFORMAT_URL="https://github.com/nicklockwood/SwiftFormat/releases/download/${SWIFTFORMAT_VERSION}/swiftformat_linux.zip"        SWIFTLINT_URL="https://github.com/realm/SwiftLint/releases/download/${SWIFTLINT_VERSION}/swiftlint_linux_amd64.zip"        ;;      aarch64|arm64)        SWIFTFORMAT_URL="https://github.com/nicklockwood/SwiftFormat/releases/download/${SWIFTFORMAT_VERSION}/swiftformat_linux_aarch64.zip"        SWIFTLINT_URL="https://github.com/realm/SwiftLint/releases/download/${SWIFTLINT_VERSION}/swiftlint_linux_arm64.zip"        ;;      *)        fail "Unsupported Linux arch: ${ARCH}"        ;;    esac     # SHA256 is intentionally only enforced for the macOS CI path.    # If we later run lint on Linux CI, add pinned SHAs here as well.    log "WARN: Linux SHA256 verification not configured for ${ARCH}; installing anyway."    install_zip_binary "SwiftFormat ${SWIFTFORMAT_VERSION}" "$SWIFTFORMAT_URL" "" "swiftformat"    install_zip_binary "SwiftLint ${SWIFTLINT_VERSION}" "$SWIFTLINT_URL" "" "swiftlint"    ;;  *)    fail "Unsupported OS: ${OS}"    ;;esac log "==> Installed lint tools to ${BIN_DIR}""${BIN_DIR}/swiftformat" --version"${BIN_DIR}/swiftlint" version