protected void echo()

in gogo/jline/src/main/java/org/apache/felix/gogo/jline/Posix.java [1426:1513]
88 lines of code
36 McCabe index (conditional complexity)

    protected void echo(CommandSession session, Process process, Object[] argv) throws Exception {
        final String[] usage = {
                "echo - echoes or prints ARGUMENT to standard output",
                "Usage: echo [OPTIONS] [ARGUMENTS]",
                "  -? --help                show help",
                "  -n                       no trailing new line"
        };
        Options opt = parseOptions(session, usage, argv);
        List<String> args = opt.args();
        StringBuilder buf = new StringBuilder();
        if (args != null) {
            for (String arg : args) {
                if (buf.length() > 0)
                    buf.append(' ');
                for (int i = 0; i < arg.length(); i++) {
                    int c = arg.charAt(i);
                    int ch;
                    if (c == '\\') {
                        c = i < arg.length() - 1 ? arg.charAt(++i) : '\\';
                        switch (c) {
                            case 'a':
                                buf.append('\u0007');
                                break;
                            case 'n':
                                buf.append('\n');
                                break;
                            case 't':
                                buf.append('\t');
                                break;
                            case 'r':
                                buf.append('\r');
                                break;
                            case '\\':
                                buf.append('\\');
                                break;
                            case '0':
                            case '1':
                            case '2':
                            case '3':
                            case '4':
                            case '5':
                            case '6':
                            case '7':
                            case '8':
                            case '9':
                                ch = 0;
                                for (int j = 0; j < 3; j++) {
                                    c = i < arg.length() - 1 ? arg.charAt(++i) : -1;
                                    if (c >= 0) {
                                        ch = ch * 8 + (c - '0');
                                    }
                                }
                                buf.append((char) ch);
                                break;
                            case 'u':
                                ch = 0;
                                for (int j = 0; j < 4; j++) {
                                    c = i < arg.length() - 1 ? arg.charAt(++i) : -1;
                                    if (c >= 0) {
                                        if (c >= 'A' && c <= 'Z') {
                                            ch = ch * 16 + (c - 'A' + 10);
                                        } else if (c >= 'a' && c <= 'z') {
                                            ch = ch * 16 + (c - 'a' + 10);
                                        } else if (c >= '0' && c <= '9') {
                                            ch = ch * 16 + (c - '0');
                                        } else {
                                            break;
                                        }
                                    }
                                }
                                buf.append((char) ch);
                                break;
                            default:
                                buf.append((char) c);
                                break;
                        }
                    } else {
                        buf.append((char) c);
                    }
                }
            }
        }
        if (opt.isSet("n")) {
            process.out().print(buf);
        } else {
            process.out().println(buf);
        }
    }