readfhicl.cc

#include <iostream>
#include "fhiclcpp/ParameterSet.h"
#include "fhiclcpp/make_ParameterSet.h"

#include <boost/program_options.hpp>

using namespace fhicl;
namespace bpo = boost::program_options;


int main(int argc, char* argv[]) try
{
    // Get the input parameters via the boost::program_options library,
    // designed to make it relatively simple to define arguments and
    // issue errors if argument list is supplied incorrectly

    std::ostringstream descstr;
    descstr << argv[0] << " <-c <config-file>> <other-options>";

    bpo::options_description desc = descstr.str();

    desc.add_options()
        ("config,c", bpo::value<std::string>(), "Configuration file.")
        ("help,h", "produce help message");

    bpo::variables_map vm;

    try
    {
        bpo::store(bpo::command_line_parser(argc, argv).options(desc).run(), vm);
        bpo::notify(vm);
    }
    catch (bpo::error const& e)
    {
        std::cerr << "Exception from command line processing in " << argv[0]
            << ": " << e.what() << "\n";
        return -1;
    }

    if (vm.count("help"))
    {
        std::cout << desc << std::endl;
        return 1;
    }
    if (!vm.count("config"))
    {
        std::cerr << "Exception from command line processing in " << argv[0]
            << ": no configuration file given.\n"
            << "For usage and an options list, please do '"
            << argv[0] << " --help"
            << "'.\n";
        return 2;
    }


    // Check the directories defined by the FHICL_FILE_PATH
    // environmental variable for the *.fcl file whose name was passed to
    // the command line. If not defined, look in the current directory.

    ParameterSet complete_pset;


    if (getenv("FHICL_FILE_PATH") == nullptr)
    {
        std::cerr
            << "INFO: environment variable FHICL_FILE_PATH was not set. Using \".\"\n";
        setenv("FHICL_FILE_PATH", ".", 0);
    }

    auto file_name = vm["config"].as<std::string>();
    auto filepath_maker = cet::filepath_lookup("FHICL_FILE_PATH");

    make_ParameterSet(file_name, filepath_maker, complete_pset);

    std::cout << complete_pset.to_indented_string(0, false) << "\n";

    return 0;
}

catch (std::string& x)
{
    std::cerr << "Exception (type string) caught in driver: " << x << "\n";
    return 1;
}

catch (char const* m)
{
    std::cerr << "Exception (type char const*) caught in driver: " << std::endl;
    if (m)
    {
        std::cerr << m;
    }
    else
    {
        std::cerr << "[the value was a null pointer, so no message is available]";
    }
    std::cerr << '\n';
}