Function get_line

src/Chain/libraries/cli/Cli.cpp:107–166

        FC_DECLARE_DERIVED_EXCEPTION(exit_cli_command, thinkyoung::cli::cli_exception, 11002, "exit CLI client requested by user");

        string get_line(
            std::istream* input_stream,
            std::ostream* out,
            const string& prompt,          // = CLI_PROMPT_SUFFIX
            bool no_echo,                  // = false
            fc::thread* cin_thread,        // = nullptr
            bool saved_out,                // = false
            std::ostream* input_stream_log // = nullptr
            )
        {
            if (input_stream == nullptr)
                FC_CAPTURE_AND_THROW(thinkyoung::cli::exit_cli_command); //_input_stream != nullptr );

            //FC_ASSERT( _self->is_interactive() );
            string line;
            if (no_echo)
            {
                *out << prompt;
                // there is no need to add input to history when echo is off, so both Windows and Unix implementations are same
                fc::set_console_echo(false);
                sync_call(cin_thread, [&](){ std::getline(*input_stream, line); }, "getline");
                fc::set_console_echo(true);
                *out << std::endl;
            }
            else
            {
#ifdef HAVE_READLINE
                if (input_stream == &std::cin)
                {
                    char* line_read = nullptr;
                    out->flush(); //readline doesn't use cin, so we must manually flush _out
                    line_read = readline(prompt.c_str());
                    if (line_read && *line_read)
                        add_history(line_read);
                    if (line_read == nullptr)
                        FC_THROW_EXCEPTION(fc::eof_exception, "");
                    line = line_read;
                    free(line_read);
                }
                else
                {
                    *out << prompt;
                    sync_call(cin_thread, [&](){ std::getline(*input_stream, line); }, "getline");
                }
#else
                *out << prompt;
                sync_call(cin_thread, [&](){ std::getline(*input_stream, line); }, "getline");
#endif
                if (input_stream_log != nullptr)
                {
                    out->flush();
                    if (saved_out)
                        *input_stream_log << CLI_PROMPT_SUFFIX;
                    *input_stream_log << line << std::endl;
                }
            }

            boost::trim(line);