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#include "utils/cmdline/globals.hpp"

#include "utils/format/macros.hpp"
#include "utils/logging/macros.hpp"
#include "utils/fs/path.hpp"
#include "utils/sanity.hpp"

namespace cmdline = utils::cmdline;

namespace {


/// The name of the binary used to execute the program.
static std::string Progname;


}  // anonymous namespace


/// Initializes the global state of the CLI.
///
/// This function can only be called once during the execution of a program,
/// unless override_for_testing is set to true.
///
/// \param argv0 The value of argv[0]; i.e. the program name.
/// \param override_for_testing Should always be set to false unless for tests
///     of this functionality, which may set this to true to redefine internal
///     state.
void
cmdline::init(const char* argv0, const bool override_for_testing)
{
    if (!override_for_testing)
        PRE_MSG(Progname.empty(), "cmdline::init called more than once");
    Progname = utils::fs::path(argv0).leaf_name();
    LD(F("Program name: %s") % Progname);
    POST(!Progname.empty());
}


/// Gets the program name.
///
/// \pre init() must have been called in advance.
///
/// \return The program name.
const std::string&
cmdline::progname(void)
{
    PRE_MSG(!Progname.empty(), "cmdline::init not called yet");
    return Progname;
}