nix/src/libmain/common-args.cc

#include "common-args.hh"
#include "globals.hh"

namespace nix {

MixCommonArgs::MixCommonArgs(const string & programName)
    : programName(programName)
{
    mkFlag()
        .longName("verbose")
        .shortName('v')
        .description("increase verbosity level")
        .handler([]() { verbosity = (Verbosity) ((uint64_t) verbosity + 1); });

    mkFlag()
        .longName("quiet")
        .description("decrease verbosity level")
        .handler([]() { verbosity = verbosity > Verbosity::Error
            ? (Verbosity) ((uint64_t) verbosity - 1)
            : Verbosity::Error; });

    mkFlag()
        .longName("debug")
        .description("enable debug output")
        .handler([]() { verbosity = Verbosity::Debug; });

    mkFlag()
        .longName("option")
        .labels({"name", "value"})
        .description("set a Nix configuration option (overriding nix.conf)")
        .arity(2)
        .handler([](std::vector<std::string> ss) {
            try {
                globalConfig.set(ss[0], ss[1]);
            } catch (UsageError & e) {
                warn(e.what());
            }
        });

    mkFlag()
        .longName("max-jobs")
        .shortName('j')
        .label("jobs")
        .description("maximum number of parallel builds")
        .handler([=](std::string s) {
            settings.set("max-jobs", s);
        });

    std::string cat = "config";
    globalConfig.convertToArgs(*this, cat);

    // Backward compatibility hack: nix-env already had a --system flag.
    if (programName == "nix-env") longFlags.erase("system");

    hiddenCategories.insert(cat);
}

}