public static int process()

in client/src/main/java/com/taobao/arthas/client/TelnetConsole.java [203:343]
111 lines of code
21 McCabe index (conditional complexity)

    public static int process(String[] args, ActionListener eotEventCallback) throws IOException {
        // support mingw/cygw jline color
        if (OSUtils.isCygwinOrMinGW()) {
            System.setProperty("jline.terminal", System.getProperty("jline.terminal", "jline.UnixTerminal"));
        }

        TelnetConsole telnetConsole = new TelnetConsole();
        CLI cli = CLIConfigurator.define(TelnetConsole.class);

        CommandLine commandLine = cli.parse(Arrays.asList(args));

        CLIConfigurator.inject(commandLine, telnetConsole);

        if (telnetConsole.isHelp()) {
            System.out.println(usage(cli));
            return STATUS_OK;
        }

        // Try to read cmds
        List<String> cmds = new ArrayList<String>();
        if (telnetConsole.getCommand() != null) {
            for (String c : telnetConsole.getCommand().split(";")) {
                cmds.add(c.trim());
            }
        } else if (telnetConsole.getBatchFile() != null) {
            File file = new File(telnetConsole.getBatchFile());
            if (!file.exists()) {
                throw new IllegalArgumentException("batch file do not exist: " + telnetConsole.getBatchFile());
            } else {
                cmds.addAll(readLines(file));
            }
        }

        final ConsoleReader consoleReader = new ConsoleReader(System.in, System.out);
        consoleReader.setHandleUserInterrupt(true);
        Terminal terminal = consoleReader.getTerminal();

        // support catch ctrl+c event
        terminal.disableInterruptCharacter();
        if (terminal instanceof UnixTerminal) {
            ((UnixTerminal) terminal).disableLitteralNextCharacter();
        }

        try {
            int width = TerminalSupport.DEFAULT_WIDTH;
            int height = TerminalSupport.DEFAULT_HEIGHT;

            if (!cmds.isEmpty()) {
                // batch mode
                if (telnetConsole.getWidth() != null) {
                    width = telnetConsole.getWidth();
                }
                if (telnetConsole.getheight() != null) {
                    height = telnetConsole.getheight();
                }
            } else {
                // normal telnet client, get current terminal size
                if (telnetConsole.getWidth() != null) {
                    width = telnetConsole.getWidth();
                } else {
                    width = terminal.getWidth();
                    // hack for windows dos
                    if (OSUtils.isWindows()) {
                        width--;
                    }
                }
                if (telnetConsole.getheight() != null) {
                    height = telnetConsole.getheight();
                } else {
                    height = terminal.getHeight();
                }
            }

            final TelnetClient telnet = new TelnetClient();
            telnet.setConnectTimeout(DEFAULT_CONNECTION_TIMEOUT);

            // send init terminal size
            TelnetOptionHandler sizeOpt = new WindowSizeOptionHandler(width, height, true, true, false, false);
            try {
                telnet.addOptionHandler(sizeOpt);
            } catch (InvalidTelnetOptionException e) {
                // ignore
            }

            // ctrl + c event callback
            consoleReader.getKeys().bind(Character.toString((char) CTRL_C), new ActionListener() {
                @Override
                public void actionPerformed(ActionEvent e) {
                    try {
                        consoleReader.getCursorBuffer().clear(); // clear current line
                        telnet.getOutputStream().write(CTRL_C);
                        telnet.getOutputStream().flush();
                    } catch (Exception e1) {
                        e1.printStackTrace();
                    }
                }

            });

            // ctrl + d event call back
            consoleReader.getKeys().bind(Character.toString(KeyMap.CTRL_D), eotEventCallback);

            try {
                telnet.connect(telnetConsole.getTargetIp(), telnetConsole.getPort());
            } catch (IOException e) {
                System.out.println("Connect to telnet server error: " + telnetConsole.getTargetIp() + " "
                        + telnetConsole.getPort());
                throw e;
            }

            if (cmds.isEmpty()) {
                IOUtil.readWrite(telnet.getInputStream(), telnet.getOutputStream(), consoleReader.getInput(),
                        consoleReader.getOutput());
            } else {
                try {
                    return batchModeRun(telnet, cmds, telnetConsole.getExecutionTimeout());
                } catch (Throwable e) {
                    System.out.println("Execute commands error: " + e.getMessage());
                    e.printStackTrace();
                    return STATUS_EXEC_ERROR;
                } finally {
                    try {
                        telnet.disconnect();
                    } catch (IOException e) {
                        //ignore ex
                    }
                }
            }

            return STATUS_OK;
        } finally {
            //reset terminal setting, fix https://github.com/alibaba/arthas/issues/1412
            try {
                terminal.restore();
            } catch (Throwable e) {
                System.out.println("Restore terminal settings failure: "+e.getMessage());
                e.printStackTrace();
            }
        }

    }