#!/bin/bash
# SPDX-License-Identifier: BSD-3-Clause

set -euo pipefail

ROOT_PATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )/../"

# Run consistently from the repo root regardless of where the script is called
cd "$ROOT_PATH"

# Lint every markdown file tracked in git, except:
#  - CHANGELOG.md: generated by the release process; long release-note
#    URLs and per-release repeated section headers are part of the format
#  - CLAUDE.md: a symlink to AGENTS.md, which is already linted
mapfile -t MARKDOWN_FILES < <(git ls-files '*.md' ':!CHANGELOG.md' ':!CLAUDE.md')

run_lint() {
	if ! command -v mdl >/dev/null 2>&1; then
		echo "mdl not found." >&2
		echo "Install it with: sudo apt install markdownlint  (or 'gem install mdl')" >&2
		exit 1
	fi
	mdl "${MARKDOWN_FILES[@]}"
}

usage() {
	echo "Usage: $0 {check}"
	exit 2
}

case "${1:-}" in
	check)  run_lint ;;
	*)      usage ;;
esac