!7

sclass Backtick extends DynPrintLog {
  S cmd;
  S method = "Stefan's method";
  transient JButton btnGo;
  
  JComponent visualize() {
    ret northAndCenter(
      vstackWithSpacing(
        centerAndEastWithMargins(
          withLabel("Command:", onEnter(jLiveValueTextField_bothWays(dm_fieldLiveValue('cmd)), r go)),
            btnGo = jbutton("Go", r go)),
        withRightMargin(jrightAlignedLine(withLabel("Method:", jLiveValueComboBox(ll("Stefan's method", "Apache Commons Exec"), dm_fieldLiveValue('method)))))),
      super.visualize());
  }
  
  void go() {
    pcall-short {
      temp enter();
      temp tempDisableButton(btnGo);
      clearPrintLog();
      S cmd = this.cmd;
      print("Running command with " + method + ": " + cmd + "\n");
      
      int exitValue;
      if (eq(method, "Apache Commons Exec")) {
        OutputStream stream1 = printOutputStreamWithIndent("  ");
        OutputStream stream2 = printOutputStreamWithIndent("  ");
        
        exitValue = apacheCommonsExec_backtickToStreams(cmd, stream1, stream2);
          
        // print empty lines & flush stdout & stderr
        stream1.write(toUtf8("\n"));
        stream2.write(toUtf8("\n"));
      } else {
        LineBuffer buf = lineBuffer_printWithIndent("  ");
        backtickToReceiver(cmd, vfAppendToLineBuffer(buf));
        exitValue = backtick_exitValue;
        print();
      }
        
      print("Exit value: " + exitValue);
    }
  }
}