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#!/usr/bin/env bash
# SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
# SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
# SPDX-License-Identifier: BSD-3-Clause
#
# Usage: link_check.sh <SeqAn3 root directory>
# Will output the status of links in the repository.
#
# Of main interest are broken links and those with a "Link STATUS" message.
# Some URLs may not be properly matched by the regex.
#
# The general workflow is to first run the script and then check the non-working links by searching the occurrence
# within the codebase and verifying that they are indeed broken.
COUNT=0
do_check ()
{
(( COUNT++ ))
RESPONSE=$(curl --http2 -Is -A 'Mozilla/5.0' "$1") # HTTP2 is the default.
if ! [[ "${RESPONSE}" =~ ^HTTP.* ]]; then # If this does not work,
RESPONSE=$(curl --http1.1 -Is -A 'Mozilla/5.0' "$1") # fall back to HTTP1.1.
fi
HEADER=($(echo "${RESPONSE}" | head -1)); # May look like: HTTP/2 200
STATUS=${HEADER[1]}
echo -n "[${COUNT}] "
case "$STATUS" in
200) echo "Link OK : $1";;
301) echo "Link PERM MOVED : $1";;
302) echo "Link TEMP MOVED : $1";;
404) echo "Link BROKE : $1";;
429) sleep 5; do_check "$1";;
*) echo "Link STATUS ${STATUS} : $1";;
esac
}
if [[ $# -ne 1 ]] && [[ $# -ne 2 ]]; then
echo "Usage: link_check.sh <SeqAn3 root directory> <Skip first n=0 entries>"
exit 1
fi
if [[ ! -d $1 ]]; then
echo "The directory $1 does not exist."
exit 1
fi
if [[ ! -f $1/include/seqan3/version.hpp ]]; then
echo "The directory $1 does not seem to be the SeqAn3 root directory."
echo "Cannot find $1/include/seqan3/version.hpp."
exit 1
fi
SKIP="${2:-0}"
COUNT=$((COUNT + SKIP))
for URL in $(grep -ohr --exclude-dir={.git,.vscode,build} "https*://[a-zA-Z0-9./#+?=_%:-]*[a-zA-Z0-9/#+?=_%:-]" "$1" | sort | uniq | tail -n +"${SKIP}")
do
do_check "${URL}"
done
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