auto subname = parsed.subcommand_name();

if (subname.empty()) {

mcpp::ui::error("`mcpp toolchain` requires a subcommand: install / list / default / remove");

return 2;

}

const mcpplibs::cmdline::ParsedArgs& sub_parsed = *parsed.subcommand_matches;

// Surface bootstrap (xim:patchelf, xim:ninja) as a progress bar — same

// treatment any other download here gets, so the user isn't staring at

// a quiet "Bootstrap…" line during a slow link.

auto cfg = mcpp::config::load_or_init(/*quiet=*/false,

mcpp::fetcher::make_bootstrap_progress_callback());

if (!cfg) { mcpp::ui::error(cfg.error().message); return 4; }

// The optional --target axis (install/default/remove): which target's

// payload the command operates on. Omitted = host.

std::string targetArg;

if (auto t = sub_parsed.value("target")) targetArg = *t;

if (subname == "list") {

bool json = false;

if (auto f = sub_parsed.value("format")) {

if (!mcpp::wire::parse_format(*f)) {

std::println(stderr, "error: {}",

mcpp::wire::unsupported_format(*f));

return 2;

}

json = true;

}

return mcpp::toolchain::toolchain_list(*cfg, json);

}

if (subname == "install")

return mcpp::toolchain::toolchain_install(

*cfg, sub_parsed.positional(0), sub_parsed.positional(1), targetArg);

if (subname == "default")

return mcpp::toolchain::toolchain_set_default(

*cfg, sub_parsed.positional(0), sub_parsed.positional(1), targetArg);

if (subname == "remove")

return mcpp::toolchain::toolchain_remove(*cfg, sub_parsed.positional(0), targetArg);

mcpp::ui::error(std::format("unknown toolchain subcommand '{}'", subname));

return 2;