[vcpkg-tool] how to list all ports that depend on certain dependency

[miyanyan]

Is your feature request related to a problem? Please describe.

I come to this idea when I update boost to 1.87.0, I want to know all ports that depend on asio, this command may something like:

vcpkg depend-on asio
# then all ports list below

I found vcpkg depend-info but it list the dependencies of asio
I found vcpkg ci which can get the ports needed to retest

Proposed solution

Can I add a command option to vcpkg-tool, like:

void command_depend_on_and_exit(const VcpkgCmdArguments& args,
                                const VcpkgPaths& paths,
                                Triplet default_triplet,
                                Triplet host_triplet)
{
    msg::default_output_stream = OutputStream::StdErr;
    const ParsedArguments options = args.parse_arguments(CommandDependOnMetadata);
    auto& fs = paths.get_filesystem();
    auto registry_set = paths.make_registry_set();
    PathsPortFileProvider provider(*registry_set, make_overlay_provider(fs, paths.overlay_ports));
    auto source_paragraphs =
        Util::fmap(provider.load_all_control_files(),
                   [](auto&& port) -> const SourceControlFile* { return port->source_control_file.get(); });
    const auto filter = options.command_arguments[0];

    for (const auto& source_control_file : source_paragraphs)
    {
        bool matched = Util::any_of(source_control_file->core_paragraph->dependencies,
                                    [&](const auto& dependency) { return dependency.name == filter; });

        if (!matched)
        {
            for (const auto& feature_paragraph : source_control_file->feature_paragraphs)
            {
                matched = Util::any_of(feature_paragraph->dependencies,
                                       [&](const auto& dependency) { return dependency.name == filter; });
                if (matched)
                {
                    break;
                }
            }
        }

        if (matched)
        {
            msg::write_unlocalized_text_to_stdout(Color::none, source_control_file->core_paragraph->name);
            msg::write_unlocalized_text_to_stdout(Color::none, "\n");
        }
    }
    Checks::exit_success(VCPKG_LINE_INFO);
}

Describe alternatives you've considered

No response

Additional context

No response