linuxPackages_latest.prl-tools: use libxml2 to parse html in update script

#!/usr/bin/env nix-shell

#!nix-shell -i bash -p curl jq

#!nix-shell -i bash -p curl jq libxml2

set -eu -o pipefail

kb_url="https://kb.parallels.com/en/130212"

content="$(curl -s "$kb_url")"

# Match latest version from Parallels knowledge base

regex='<meta property="og:description" content="[^"]*Parallels Desktop[\ 0-9]*for Mac ([0-9]+\.[0-9]+\.[0-9+]) \(([0-9]+)\)[^"]*" />'

if [[ $content =~ $regex ]]; then

# Parse HTML content and retrieve og:description for header metadata

description=$(echo "$content" | xmllint --recover --html --xpath 'string(//meta[@property="og:description"]/@content)' - 2>/dev/null)

regex='[^0-9]+([0-9]+\.[0-9]+\.[0-9]+)[^\(]+\(([0-9]+)\)'

if [[ $description =~ $regex ]]; then

    version="${BASH_REMATCH[1]}-${BASH_REMATCH[2]}"

    echo "Found latest version: $version"

else

    echo "Failed to extract version from $kb_url" >&2

    echo "Retrived description: $description" >&2

    exit 1

fi