#include "sh.h"
#include <errno.h>
#include <os/ArgumentParser.h>
#include <stdlib.h>

shell_builtin_t builtin_unset = [](int argc, char** argv) -> Result<void> {
    StringView name;

    os::ArgumentParser parser;
    parser.set_should_exit_on_bad_usage(false);
    parser.add_description("Remove an environment variable (shell builtin)"_sv);
    parser.add_system_program_info("unset"_sv);
    parser.add_positional_argument(name, "name"_sv, true);
    if (!TRY(parser.parse(argc, argv))) return {};

    if (unsetenv(name.chars()) < 0) return err(errno);

    return {};
};