Add scripts that can be used to ensure format

scripts/clang-format-linux.sh

@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_ROOT="$(cd "${SCRIPT_DIR}/.." && pwd)"
+
+TEST_MODE=0
+if [[ $# -gt 1 ]]; then
+  echo "Unknown arguments. Supported flags: --test, -t" >&2
+  exit 2
+fi
+
+if [[ $# -eq 1 ]]; then
+  if [[ "${1:-}" == "--test" || "${1:-}" == "-t" ]]; then
+    TEST_MODE=1
+  else
+    echo "Unknown argument: ${1:-}. Supported flags: --test, -t" >&2
+    exit 2
+  fi
+fi
+
+cd "${REPO_ROOT}"
+
+if ! VERSION_OUTPUT="$(clang-format --version 2>/dev/null)"; then
+  echo "Unable to run clang-format --version. Make sure clang-format is in PATH." >&2
+  exit 127
+fi
+
+if [[ "${VERSION_OUTPUT}" =~ clang-format[[:space:]]+version[[:space:]]+([0-9]+(\.[0-9]+)*) ]]; then
+  VERSION="${BASH_REMATCH[1]}"
+  echo "Running using clang-format ${VERSION}"
+else
+  echo "Running using ${VERSION_OUTPUT}"
+fi
+
+find . \( -name '*.h' -or -name '*.cpp' -or -name '*.c' -or -name '*.mm' -or -name '*.m' \) -print0 | xargs -0 clang-format -style=file -i
+
+if [[ "${TEST_MODE}" -eq 1 ]]; then
+  BASE_SHA="$(git rev-parse HEAD)"
+  git diff "${BASE_SHA}"
+  if [[ "$(git diff "${BASE_SHA}")" != "" ]]; then
+    exit 1
+  fi
+fi