Function makeCommandLineParser

extern/Catch2/catch.hpp:9702–9909

namespace Catch {

    clara::Parser makeCommandLineParser( ConfigData& config ) {

        using namespace clara;

        auto const setWarning = [&]( std::string const& warning ) {
                auto warningSet = [&]() {
                    if( warning == "NoAssertions" )
                        return WarnAbout::NoAssertions;

                    if ( warning == "NoTests" )
                        return WarnAbout::NoTests;

                    return WarnAbout::Nothing;
                }();

                if (warningSet == WarnAbout::Nothing)
                    return ParserResult::runtimeError( "Unrecognised warning: '" + warning + "'" );
                config.warnings = static_cast<WarnAbout::What>( config.warnings | warningSet );
                return ParserResult::ok( ParseResultType::Matched );
            };
        auto const loadTestNamesFromFile = [&]( std::string const& filename ) {
                std::ifstream f( filename.c_str() );
                if( !f.is_open() )
                    return ParserResult::runtimeError( "Unable to load input file: '" + filename + "'" );

                std::string line;
                while( std::getline( f, line ) ) {
                    line = trim(line);
                    if( !line.empty() && !startsWith( line, '#' ) ) {
                        if( !startsWith( line, '"' ) )
                            line = '"' + line + '"';
                        config.testsOrTags.push_back( line );
                        config.testsOrTags.emplace_back( "," );
                    }
                }
                //Remove comma in the end
                if(!config.testsOrTags.empty())
                    config.testsOrTags.erase( config.testsOrTags.end()-1 );

                return ParserResult::ok( ParseResultType::Matched );
            };
        auto const setTestOrder = [&]( std::string const& order ) {
                if( startsWith( "declared", order ) )
                    config.runOrder = RunTests::InDeclarationOrder;
                else if( startsWith( "lexical", order ) )
                    config.runOrder = RunTests::InLexicographicalOrder;
                else if( startsWith( "random", order ) )
                    config.runOrder = RunTests::InRandomOrder;
                else
                    return clara::ParserResult::runtimeError( "Unrecognised ordering: '" + order + "'" );
                return ParserResult::ok( ParseResultType::Matched );
            };
        auto const setRngSeed = [&]( std::string const& seed ) {
                if( seed != "time" )
                    return clara::detail::convertInto( seed, config.rngSeed );
                config.rngSeed = static_cast<unsigned int>( std::time(nullptr) );
                return ParserResult::ok( ParseResultType::Matched );
            };