gen_sitemap

#!/usr/bin/env bash
# generate_sitemap.sh — build a sitemap.xml from a directory of HTML files
#
# Usage:
#   ./generate_sitemap.sh <site_dir> <base_url> [output_file]
#
# Example:
#   ./generate_sitemap.sh public https://kazam.pages.dev sitemap.xml
#
# Assumes a static site build output dir (e.g. Zola's `public/`), where each
# .html file maps 1:1 to a URL path. index.html files are mapped to their
# parent directory URL.

set -euo pipefail

SITE_DIR="${1:?Usage: $0 <site_dir> <base_url> [output_file]}"
BASE_URL="${2:?Usage: $0 <site_dir> <base_url> [output_file]}"
OUTPUT="${3:-sitemap.xml}"

# Strip trailing slash from base URL
BASE_URL="${BASE_URL%/}"

if [[ ! -d "$SITE_DIR" ]]; then
    echo "Error: site directory '$SITE_DIR' not found" >&2
    exit 1
fi

TMP_URLS="$(mktemp)"
trap 'rm -f "$TMP_URLS"' EXIT

# Find all html files, convert to URL paths
find "$SITE_DIR" -type f -name "*.html" | while read -r file; do
    rel_path="${file#"$SITE_DIR"/}"

    # index.html -> directory URL (or root)
    if [[ "$rel_path" == "index.html" ]]; then
        url_path=""
    elif [[ "$rel_path" == */index.html ]]; then
        url_path="${rel_path%/index.html}/"
    else
        url_path="$rel_path"
    fi

    lastmod="$(date -u -r "$file" +"%Y-%m-%d")"
    echo "${BASE_URL}/${url_path}|${lastmod}" >> "$TMP_URLS"
done

# Sort for stable output
sort -u "$TMP_URLS" -o "$TMP_URLS"

{
    echo '<?xml version="1.0" encoding="UTF-8"?>'
    echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'
    while IFS="|" read -r url lastmod; do
        echo "  <url>"
        echo "    <loc>${url}</loc>"
        echo "    <lastmod>${lastmod}</lastmod>"
        echo "  </url>"
    done < "$TMP_URLS"
    echo '</urlset>'
} > "$OUTPUT"

count="$(wc -l < "$TMP_URLS")"
echo "Wrote $count URLs to $OUTPUT"