check_xrefs.sh

#!/bin/bash
# Copyright (c) Meta Platforms, Inc. and affiliates.
# All rights reserved.
#
# This source code is licensed under the BSD-style license found in the
# LICENSE file in the root directory of this source tree.

set -euo pipefail

status=0
green='\e[1;32m'; red='\e[1;31m'; cyan='\e[1;36m'; yellow='\e[1;33m'; reset='\e[0m'
last_filepath=

while IFS=: read -r filepath link; do
  if [ "$filepath" != "$last_filepath" ]; then
    printf '\n%s:\n' "$filepath"
    last_filepath=$filepath
  fi
  if [ -e "$(dirname "$filepath")/${link%%#*}" ]; then
    printf " ${green}OK${reset}  ${cyan}%s${reset}\n" "$link"
  else
    printf "${red}FAIL${reset} ${yellow}%s${reset}\n" "$link" >&2
    status=1
  fi
done < <(
  git --no-pager grep --no-color -I -o -E \
    '\[[^]]+\]\([^[:space:])]*/[^[:space:])]*\)|href="[^"]*/[^"]*"|src="[^"]*/[^"]*"' \
    -- '*' \
    ':(exclude).*' \
    ':(exclude)**/.*' \
    ':(exclude)**/*.lock' \
    ':(exclude)**/*.svg' \
    ':(exclude)**/*.xml' \
    ':(exclude)**/third-party/**' \
  | grep -Ev 'https?://' \
  | sed -E \
      -e 's#([^:]+):\[[^]]+\]\(([^)]+)\)#\1:\2#' \
      -e 's#([^:]+):href="([^"]+)"#\1:\2#' \
      -e 's#([^:]+):src="([^"]+)"#\1:\2#' \
      -e 's/[[:punct:]]*$//' \
  | grep -Ev '\{\{' \
  || true
)

exit $status