FieldConvert.cpp

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////////////////////////////////////////////////////////////////////////////////
//
//  File: FieldConvert.cpp
//
//  For more information, please see: http://www.nektar.info/
//
//  The MIT License
//
//  Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
//  Department of Aeronautics, Imperial College London (UK), and Scientific
//  Computing and Imaging Institute, University of Utah (USA).
//
//  Permission is hereby granted, free of charge, to any person obtaining a
//  copy of this software and associated documentation files (the "Software"),
//  to deal in the Software without restriction, including without limitation
//  the rights to use, copy, modify, merge, publish, distribute, sublicense,
//  and/or sell copies of the Software, and to permit persons to whom the
//  Software is furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included
//  in all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
//  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
//  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
//  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
//  DEALINGS IN THE SOFTWARE.
//
//  Description: Field conversion utility.
//
////////////////////////////////////////////////////////////////////////////////
 
#include <FieldUtils/Module.h>
#include <LibUtilities/BasicUtils/Filesystem.hpp>
#include <LibUtilities/BasicUtils/Timer.h>
#include <boost/algorithm/string.hpp>
#include <boost/program_options.hpp>
#include <string>
 
using namespace std;
using namespace Nektar;
using namespace Nektar::FieldUtils;
 
void CheckModules(vector<ModuleSharedPtr> &modules);
 
void PrintExecutionSequence(vector<ModuleSharedPtr> &modules);
 
void RunModule(ModuleSharedPtr module, po::variables_map &vm, bool verbose);
 
int main(int argc, char *argv[])
{
    LibUtilities::Timer timer;
    timer.Start();
 
    po::options_description desc("Available options");
    po::options_description dep("Deprecated options");
 
    // clang-format off
    desc.add_options()
        ("help,h", "Produce this help message.")
        ("modules-list,l", "Print the list of available modules.")
        ("output-points,n", po::value<int>(),
         "Output at n equipspaced points along the "
         "collapsed coordinates (for .dat, .vtu).")
        ("output-points-hom-z", po::value<int>(),
         "Number of planes in the z-direction for output of "
         "Homogeneous 1D expansion(for .dat, .vtu).")
        ("error,e", "Write error of fields for regression checking")
        ("force-output,f", "Force the output to be written without any checks")
        ("range,r", po::value<string>(),
         "Define output range i.e. (-r xmin,xmax,ymin,ymax,zmin,zmax) "
         "in which any vertex is contained.")
        ("no-equispaced", "Do not use equispaced output.")
        ("nparts", po::value<int>(),
         "Define nparts if running serial problem to mimic "
         "parallel run with many partitions.")
        ("npz", po::value<int>(),
         "Used to define number of partitions in z for Homogeneous1D "
         "expansions for parallel runs.")
        ("npt", po::value<int>(),
         "Used to define number of partitions in time for Parareal runs. ")
        ("onlyshape", po::value<string>(),
         "Only use element with defined shape type i.e. -onlyshape "
         " Tetrahedron")
        ("part-only", po::value<int>(),
         "Partition into specified npart partitions and exit")
        ("part-only-overlapping", po::value<int>(),
         "Partition into specified npart overlapping partitions and exit")
        ("modules-opt,p", po::value<string>(),
         "Print options for a module.")
        ("module,m", po::value<vector<string>>(),
         "Specify modules which are to be used.")
        ("use-session-variables", "Use variables defined in session for output")
        ("use-session-expansion", "Use expansion defined in session.")
        ("verbose,v", "Enable verbose mode.");
    // clang-format on
 
    po::options_description hidden("Hidden options");
    hidden.add_options()("input-file", po::value<vector<string>>(),
                         "Input filename");
 
    // Deprecated options: introduced in 5.4.0 to homogenise command-line
    // options to use '-' instead of camelCase or no spaces.
    std::map<std::string, std::string> deprecated = {
        {"forceoutput", "force-output"},
        {"noequispaced", "no-equispaced"},
        {"useSessionVariables", "use-session-variables"},
        {"useSessionExpansion", "use-session-expansion"}};
 
    for (auto &d : deprecated)
    {
        std::string description = "Deprecated: use --" + d.second;
        dep.add_options()(d.first.c_str(), description.c_str());
    }
 
    po::options_description cmdline_options;
    cmdline_options.add(hidden).add(desc).add(dep);
 
    po::positional_options_description p;
    p.add("input-file", -1);
 
    po::variables_map vm;
 
    try
    {
        po::store(po::command_line_parser(argc, argv)
                      .options(cmdline_options)
                      .positional(p)
                      .run(),
                  vm);
        po::notify(vm);
    }
    catch (const std::exception &e)
    {
        cerr << e.what() << endl;
        cerr << desc;
        return 1;
    }
 
    // If NEKTAR_DISABLE_BACKUPS environment variable is set, enable the
    // force-output option.
    if (std::getenv("NEKTAR_DISABLE_BACKUPS") != nullptr)
    {
        vm.insert(std::make_pair("force-output", po::variable_value()));
    }
 
    // Deal with deprecated options.
    for (auto &d : deprecated)
    {
        if (vm.count(d.first))
        {
            std::cerr << "WARNING: --" << d.first << " deprecated: use --"
                      << d.second << std::endl;
            vm.emplace(d.second, po::variable_value(vm[d.first]));
        }
    }
 
    // Print available modules.
    if (vm.count("modules-list"))
    {
        GetModuleFactory().PrintAvailableClasses(std::cerr);
        return 1;
    }
 
    if (vm.count("modules-opt"))
    {
        vector<string> tmp1;
        boost::split(tmp1, vm["modules-opt"].as<string>(),
                     boost::is_any_of(":"));
 
        if (tmp1.size() != 2)
        {
            cerr << "ERROR: To specify a module, use one of in, out or proc "
                 << "together with the filename; for example in:vtk." << endl;
            return 1;
        }
 
        if (tmp1[0] != "in" && tmp1[0] != "out" && tmp1[0] != "proc")
        {
            cerr << "ERROR: Invalid module type (in, out, or proc): " << tmp1[0]
                 << endl;
            return 1;
        }
 
        ModuleType t = eInputModule;
 
        if (tmp1[0] == "in")
        {
            t = eInputModule;
        }
        else if (tmp1[0] == "out")
        {
            t = eOutputModule;
        }
        else if (tmp1[0] == "proc")
        {
            t = eProcessModule;
        }
 
        FieldSharedPtr f = std::shared_ptr<Field>(new Field());
        ModuleSharedPtr mod =
            GetModuleFactory().CreateInstance(ModuleKey(t, tmp1[1]), f);
        cerr << "Options for module " << tmp1[1] << ":" << endl;
        mod->PrintConfig();
        return 1;
    }
 
    // Print help message.
    if (vm.count("help") || vm.count("input-file") != 1)
    {
        cerr << "Usage: FieldConvert [options] "
                "[inputfile.xml] inputfile.ext1 outputfile.ext2"
             << endl;
        cout << desc;
        cout << endl;
        cout << "Example Usage: \n" << endl;
        cout << "\t FieldConvert -m vorticity file.xml file.fld file_vort.fld "
             << endl;
        cout << "(This will add vorticity to file file.fld and put it in a "
                "new file file_vort.fld. \n file.xml is a Nektar XML input "
                "file containing the geometry.) "
             << endl;
        cout << endl;
        cout << "\t FieldConvert file.xml file_vort.fld file_vort.dat " << endl;
        cout << "(process file_vort.fld and make a tecplot output "
                "file_vort.dat. file.xml is a\n Nektar XML input file "
                "containing the geometry.) "
             << endl;
 
        return 1;
    }
 
    ASSERTL0(vm.count("input-file"),
             "Must specify input(s) and/or output file.");
    vector<string> inout = vm["input-file"].as<vector<string>>();
 
    /*
     * Process list of modules. Each element of the vector of module
     * strings can be in the following form:
     *
     * modname:arg1=a:arg2=b:arg3=c:arg4:arg5=asd
     *
     * where the only required argument is 'modname', specifing the
     * name of the module to load.
     */
    FieldSharedPtr f = std::shared_ptr<Field>(new Field());
    int nParts       = 1;
    int MPInprocs    = 1;
    int MPIrank      = 0;
    LibUtilities::CommSharedPtr MPIComm;
 
    if (LibUtilities::GetCommFactory().ModuleExists("ParallelMPI"))
    {
        // Get hold of parallel communicator first.
        MPIComm = LibUtilities::GetCommFactory().CreateInstance("ParallelMPI",
                                                                argc, argv);
 
        if (vm.count("nparts"))
        {
            // Work out number of processors to run in serial over partitions.
            MPInprocs = MPIComm->GetSpaceComm()->GetSize();
            MPIrank   = MPIComm->GetSpaceComm()->GetRank();
 
            nParts = vm["nparts"].as<int>();
 
            f->m_comm = LibUtilities::GetCommFactory().CreateInstance(
                "Serial", argc, argv);
        }
        else
        {
            f->m_comm = MPIComm;
        }
    }
    else
    {
        if (vm.count("nparts"))
        {
            nParts = vm["nparts"].as<int>();
        }
 
        f->m_comm =
            LibUtilities::GetCommFactory().CreateInstance("Serial", argc, argv);
    }
 
    // For parallel-in-time.
    if (vm.count("npt"))
    {
        for (auto io = inout.end() - 2; io != inout.end(); io++)
        {
            // First split each command by the colon separator.
            vector<string> tmp;
            boost::split(tmp, *io, boost::is_any_of(":"));
 
            // Get original filename and extension.
            fs::path path   = tmp[0];
            fs::path dir    = path.parent_path();
            string ftype    = path.extension().string();
            string filename = path.stem().string();
 
            // Determine original index from filename.
            auto start = filename.find_last_of("_") + 1;
            auto index = atoi(filename.substr(start, filename.size()).c_str());
 
            // Create output directory if does not exit.
            if (dir != "" && f->m_comm->TreatAsRankZero() &&
                !fs::is_directory(dir) && io == inout.end() - 1)
            {
                fs::create_directory(dir);
            }
 
            // Determine new index and filename for each processor for
            // parallel-in-time processing.
            auto index_new = index + f->m_comm->GetRank() % vm["npt"].as<int>();
            fs::path path_new = dir;
            path_new /=
                filename.substr(0, start) + std::to_string(index_new) + ftype;
 
            // Determine new command for each processor for parallel-in-time
            // processing.
            *io = path_new.string();
            for (auto i = 1; i < tmp.size(); i++)
            {
                *io += ":" + tmp[i];
            }
        }
    }
 
    vector<ModuleSharedPtr> modules;
    vector<string> modcmds;
    ModuleKey module;
    ModuleSharedPtr mod;
 
    if (vm.count("verbose"))
    {
        f->m_verbose = true;
    }
 
    if (vm.count("module"))
    {
        modcmds = vm["module"].as<vector<string>>();
    }
 
    // Add input and output modules to beginning and end of this vector.
    modcmds.insert(modcmds.begin(), inout.begin(), inout.end() - 1);
    modcmds.push_back(inout.back());
 
    int nInput = inout.size() - 1;
 
    // For special case of part-only or part-only-overlapping options
    // only require a single input file and so reset the nInputs to be
    // of size inout.size(). Since the code will exit before reaching
    // any output module this seems to work as expected
    if (vm.count("part-only") || vm.count("part-only-overlapping"))
    {
        nInput = inout.size();
    }
 
    InputModuleSharedPtr inputModule;
    string outfilename;
 
    for (int i = 0; i < modcmds.size(); ++i)
    {
        // First split each command by the colon separator.
        vector<string> tmp1;
        int offset = 1;
 
        boost::split(tmp1, modcmds[i], boost::is_any_of(":"));
 
        if (i < nInput || i == modcmds.size() - 1)
        {
            // Assume all modules are input unless last, or specified to be :out
            module.first = (i < nInput ? eInputModule : eOutputModule);
            if (tmp1.size() > 1 && tmp1.back() == "out")
            {
                module.first = eOutputModule;
                tmp1.pop_back();
            }
 
            // If no colon detected, automatically detect mesh type from
            // file extension. Otherwise override and use tmp1[1] as the
            // module to load. This also allows us to pass options to
            // input/output modules. So, for example, to override
            // filename.xml to be read as vtk, you use:
            //
            // filename.xml:vtk:opt1=arg1:opt2=arg2
            if (tmp1.size() == 1)
            {
                // First, let's try to guess the input format if we're dealing
                // with input files.
                string guess;
 
                if (module.first == eInputModule)
                {
                    guess = InputModule::GuessFormat(tmp1[0]);
                }
 
                // Found file type.
                if (guess != "")
                {
                    if (f->m_verbose)
                    {
                        cout << "Using input module " << guess
                             << " for: " << tmp1[0] << endl;
                    }
 
                    module.second = guess;
                    tmp1.push_back(string("infile=" + tmp1[0]));
                }
                else
                {
                    int dot    = tmp1[0].find_last_of('.') + 1;
                    string ext = tmp1[0].substr(dot, tmp1[0].length() - dot);
 
                    // Remove trailing separator from extension to allow
                    //    folder inputs using file.fld/
                    if (ext.back() == fs::path::preferred_separator)
                    {
                        ext.pop_back();
                    }
 
                    if (ext == "gz")
                    {
                        string tmp2 = tmp1[0].substr(0, dot - 1);
                        dot         = tmp2.find_last_of('.') + 1;
                        ext = tmp1[0].substr(dot, tmp1[0].length() - dot);
                    }
 
                    module.second = ext;
                    tmp1.push_back(string(module.first == eInputModule
                                              ? "infile="
                                              : "outfile=") +
                                   tmp1[0]);
                }
            }
            else
            {
                module.second = tmp1[1];
                tmp1.push_back(string(module.first == eInputModule
                                          ? "infile="
                                          : "outfile=") +
                               tmp1[0]);
                offset++;
            }
        }
        else
        {
            module.first  = eProcessModule;
            module.second = tmp1[0];
        }
 
        // Create module.
        mod = GetModuleFactory().CreateInstance(module, f);
        modules.push_back(mod);
 
        if (module.first == eInputModule)
        {
            inputModule = std::dynamic_pointer_cast<InputModule>(mod);
            inputModule->AddFile(module.second, tmp1[0]);
        }
        else if (module.first == eOutputModule)
        {
            outfilename = tmp1[0];
            if (nParts > 1)
            {
                // If nParts is specified then ensure output modules
                // write out mutipile files.
                mod->RegisterConfig("writemultiplefiles");
            }
        }
 
        // Set options for this module.
        for (int j = offset; j < tmp1.size(); ++j)
        {
            vector<string> tmp2;
            boost::split(tmp2, tmp1[j], boost::is_any_of("="));
 
            if (tmp2.size() == 1)
            {
                mod->RegisterConfig(tmp2[0]);
            }
            else if (tmp2.size() == 2)
            {
                mod->RegisterConfig(tmp2[0], tmp2[1]);
            }
            else
            {
                cerr << "ERROR: Invalid module configuration: format is "
                     << "either :arg or :arg=val" << endl;
                abort();
            }
        }
 
        // Ensure configuration options have been set.
        mod->SetDefaults();
    }
 
    Array<OneD, int> modulesCount(SIZE_ModulePriority, 0);
    for (int i = 0; i < modules.size(); ++i)
    {
        ++modulesCount[modules[i]->GetModulePriority()];
    }
 
    // Loading module prerequisites
    for (int i = 0; i < modules.size(); ++i)
    {
        // Looping through listed prereqs and loading them
        for (int j = 0; j < modules[i]->GetModulePrerequisites().size(); ++j)
        {
            mod = GetModuleFactory().CreateInstance(
                modules[i]->GetModulePrerequisites()[j], f);
            // Logic that prevents double loading
            if (modulesCount[mod->GetModulePriority()] == 0)
            {
                ++modulesCount[mod->GetModulePriority()];
                modules.push_back(mod);
                mod->SetDefaults();
            }
        }
    }
 
    // Include equispacedoutput module if needed
    if (modulesCount[eModifyPts] != 0 && modulesCount[eCreatePts] == 0 &&
        modulesCount[eConvertExpToPts] == 0)
    {
        module.first  = eProcessModule;
        module.second = string("equispacedoutput");
        mod           = GetModuleFactory().CreateInstance(module, f);
        modules.push_back(mod);
        mod->SetDefaults();
    }
 
    // Check if modules provided are compatible.
    CheckModules(modules);
    // Can't have ContField with range option (because of boundaries).
    if (vm.count("range") && f->m_declareExpansionAsContField)
    {
        ASSERTL0(false, "Can't use range option with module requiring "
                        "a continuous expansion.");
    }
 
    bool verbose = (f->m_verbose && f->m_comm->TreatAsRankZero());
    if (verbose)
    {
        PrintExecutionSequence(modules);
    }
 
    // Loop on partitions if required.
    LibUtilities::CommSharedPtr defComm = f->m_comm;
    LibUtilities::CommSharedPtr partComm;
    for (int p = MPIrank; p < nParts; p += MPInprocs)
    {
        // Write out which partition is being processed and defined a
        // new serial communicator.
        if (nParts > 1)
        {
            cout << endl << "Processing partition: " << p << endl;
 
            int rank = p;
            f->ClearField();
            partComm = std::shared_ptr<FieldConvertComm>(
                new FieldConvertComm(argc, argv, nParts, rank));
        }
 
        // Run field process.
        for (int n = 0; n < SIZE_ModulePriority; ++n)
        {
            ModulePriority priority = static_cast<ModulePriority>(n);
 
            if (nParts > 1)
            {
                if (((priority == eCreateGraph) || (priority == eOutput)))
                {
                    f->m_comm = partComm;
                }
                else
                {
                    f->m_comm = defComm;
                }
            }
 
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == priority)
                {
                    RunModule(modules[i], vm, verbose);
                }
            }
        }
    }
 
    // Write out Info file if required.
    if (nParts > 1)
    {
        int i;
        // Check to see if we have created a fld file.
        for (i = 0; i < modules.size(); ++i)
        {
            if (boost::iequals(modules[i]->GetModuleName(), "OutputFld"))
            {
                break;
            }
        }
 
        if (i != modules.size())
        {
            if (MPInprocs > 1)
            {
                MPIComm->GetSpaceComm()->Block();
            }
 
            if (MPIrank == 0)
            {
                module.first  = eOutputModule;
                module.second = string("info");
                mod           = GetModuleFactory().CreateInstance(module, f);
 
                mod->RegisterConfig("nparts",
                                    boost::lexical_cast<string>(nParts));
                mod->SetDefaults();
 
                if (f->m_writeBndFld)
                {
                    // Find ending of output file and insert _b1, _b2.
                    int dot = outfilename.find_last_of('.') + 1;
                    string ext =
                        outfilename.substr(dot, outfilename.length() - dot);
                    string name = outfilename.substr(0, dot - 1);
 
                    for (int b = 0; b < f->m_bndRegionsToWrite.size(); ++b)
                    {
                        string outfilenew = name + "_b" +
                                            boost::lexical_cast<string>(
                                                f->m_bndRegionsToWrite[b]) +
                                            "." + ext;
                        mod->RegisterConfig("outfile", outfilenew);
                        RunModule(mod, vm, verbose);
                    }
                }
                else
                {
                    mod->RegisterConfig("outfile", outfilename);
                    RunModule(mod, vm, verbose);
                }
            }
        }
    }
 
    timer.Stop();
 
    if (verbose)
    {
        NekDouble cpuTime = timer.TimePerTest(1);
 
        stringstream ss;
        ss << cpuTime << "s";
        cout << "Total CPU Time: " << setw(8) << left << ss.str() << endl;
    }
 
    if (MPInprocs > 1)
    {
        MPIComm->GetSpaceComm()->Block();
        MPIComm->GetSpaceComm()->Finalise();
    }
 
    return 0;
}
 
// This function checks validity conditions for the list of modules provided
void CheckModules(vector<ModuleSharedPtr> &modules)
{
    // Count number of modules by priority.
    Array<OneD, int> modulesCount(SIZE_ModulePriority, 0);
    for (int i = 0; i < modules.size(); ++i)
    {
        ++modulesCount[modules[i]->GetModulePriority()];
    }
 
    // Modules of type eModifyFieldData require a eCreateFieldData module.
    if (modulesCount[eModifyFieldData] != 0 &&
        modulesCount[eCreateFieldData] == 0)
    {
        stringstream ss;
        ss << "Module(s): ";
        for (int i = 0; i < modules.size(); ++i)
        {
            if (modules[i]->GetModulePriority() == eModifyFieldData)
            {
                ss << modules[i]->GetModuleName() << " ";
            }
        }
        ss << "require fld input.";
        ASSERTL0(false, ss.str());
    }
 
    // Modules of type eFillExp require eCreateGraph without eCreateFieldData.
    if (modulesCount[eFillExp] != 0)
    {
        if (modulesCount[eCreateGraph] == 0 ||
            modulesCount[eCreateFieldData] != 0)
        {
            stringstream ss;
            ss << "Module(s): ";
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == eFillExp)
                {
                    ss << modules[i]->GetModuleName() << " ";
                }
            }
            ss << "require xml input without fld input.";
            ASSERTL0(false, ss.str());
        }
    }
 
    // Modules of type eModifyExp and eBndExtraction require a eCreateGraph
    // module.
    if ((modulesCount[eModifyExp] != 0 || modulesCount[eBndExtraction] != 0) &&
        modulesCount[eCreateGraph] == 0)
    {
        stringstream ss;
        ss << "Module(s): ";
        for (int i = 0; i < modules.size(); ++i)
        {
            if (modules[i]->GetModulePriority() == eModifyExp ||
                modules[i]->GetModulePriority() == eBndExtraction)
            {
                ss << modules[i]->GetModuleName() << " ";
            }
        }
        ss << "require xml input.";
        ASSERTL0(false, ss.str());
    }
 
    // Modules of type eCreatePts should not be used with xml or fld inputs.
    if (modulesCount[eCreatePts] != 0)
    {
        if (modulesCount[eCreateGraph] != 0 ||
            modulesCount[eCreateFieldData] != 0)
        {
            stringstream ss;
            ss << "Module(s): ";
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == eCreatePts)
                {
                    ss << modules[i]->GetModuleName() << " ";
                }
            }
            ss << "should not use xml or fld inputs.";
            ASSERTL0(false, ss.str());
        }
    }
 
    // Modules of type eConvertExpToPts require eCreateGraph, but are not
    //    compatible with eBndExtraction.
    if (modulesCount[eConvertExpToPts] != 0)
    {
        if (modulesCount[eCreateGraph] == 0)
        {
            stringstream ss;
            ss << "Module(s): ";
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == eConvertExpToPts)
                {
                    ss << modules[i]->GetModuleName() << " ";
                }
            }
            ss << "require xml input.";
            ASSERTL0(false, ss.str());
        }
        if (modulesCount[eBndExtraction] != 0)
        {
            stringstream ss;
            ss << "Module(s): ";
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == eBndExtraction)
                {
                    ss << modules[i]->GetModuleName() << " ";
                }
            }
            ss << "is not compatible with module(s): ";
            for (int i = 0; i < modules.size(); ++i)
            {
                if (modules[i]->GetModulePriority() == eConvertExpToPts)
                {
                    ss << modules[i]->GetModuleName() << " ";
                }
            }
            ss << ".";
            ASSERTL0(false, ss.str());
        }
    }
}
 
// This function print the execution sequence for the list of modules provided
void PrintExecutionSequence(vector<ModuleSharedPtr> &modules)
{
    bool first = true;
    cout << "Execution sequence:" << endl;
    for (int n = 0; n < SIZE_ModulePriority; ++n)
    {
        ModulePriority priority = static_cast<ModulePriority>(n);
        for (int i = 0; i < modules.size(); ++i)
        {
            if (modules[i]->GetModulePriority() == priority)
            {
                if (first)
                {
                    cout << "\t" << modules[i]->GetModuleName();
                    first = false;
                }
                else
                {
                    cout << " -> " << modules[i]->GetModuleName();
                }
            }
        }
    }
    cout << endl;
}
 
// This function run the module provided
void RunModule(ModuleSharedPtr module, po::variables_map &vm, bool verbose)
{
    LibUtilities::Timer moduleTimer;
    if (verbose)
    {
        moduleTimer.Start();
 
        cout << module->GetModuleName() << ": "
             << module->GetModuleDescription() << endl;
    }
    module->Process(vm);
    cout.flush();
    if (verbose)
    {
        moduleTimer.Stop();
        NekDouble cpuTime = moduleTimer.TimePerTest(1);
 
        stringstream ss;
        ss << cpuTime << "s";
        cout << module->GetModuleName() << " CPU Time: " << setw(8) << left
             << ss.str() << endl;
    }
}