#!/usr/bin/env bash
set -euo pipefail

repo_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "${repo_root}"

missing=0

while IFS= read -r -d '' file; do
  while IFS= read -r link; do
    target="${link#*](}"
    target="${target%)}"
    target="${target%%#*}"
    target="${target%% *}"
    target="${target#<}"
    target="${target%>}"

    case "${target}" in
      ''|\#|http://*|https://*|mailto:*)
        continue
        ;;
    esac

    resolved="$(dirname "${file}")/${target}"
    if [[ ! -e "${resolved}" ]]; then
      printf 'missing Markdown link: %s: %s -> %s\n' \
        "${file}" "${target}" "${resolved}" >&2
      missing=1
    fi
  done < <(rg -o '\]\([^)]*\)' "${file}" || true)
done < <(
  find . -type f \( -name '*.md' -o -name '*.markdown' \) \
    -not -path './.git/*' \
    -not -path './target/*' \
    -print0
)

if [[ "${missing}" -ne 0 ]]; then
  exit 1
fi

printf 'markdown local link check ok\n'