JRubyIRBAsSubprocessTest.java

import com.intellij.util.text.CaseInsensitiveStringHashingStrategy;
import gnu.trove.THashMap;

import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;

/**
 * Created by Valentin.Fondaratov on 3/28/2016.
 */
public class Test {
  public static void main(String[] args) throws IOException, InterruptedException {
    final String[] commands = new String[]{
      "C:\\jruby-9.0.5.0\\bin\\jruby.exe",
      "-e",
      "$stdout.sync=true;$stderr.sync=true;load($0=ARGV.shift)",
      "C:/jruby-9.0.5.0/bin/jirb",
      "--prompt",
      "simple"
    };
    final String envblock = ""; // I've erased this, there should be some envs  
    THashMap<String, String> envVars = new THashMap<String, String>(CaseInsensitiveStringHashingStrategy.INSTANCE);
    for (String kv : envblock.split("\u0000")) {
      int eq = kv.indexOf('=');
      if (eq != -1) {
        envVars.put(kv.substring(0, eq), kv.substring(eq + 1));
      }
    }

    ProcessBuilder builder = new ProcessBuilder(commands);
    builder.environment().putAll(envVars);
    builder.directory(new File("C:\\"));
    //builder.inheritIO();
    builder.redirectErrorStream(false);
    builder.redirectError(ProcessBuilder.Redirect.PIPE);
    builder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
    builder.redirectInput(ProcessBuilder.Redirect.INHERIT);
    Process process = builder.start();

    try (BufferedReader in  =new BufferedReader(new InputStreamReader(process.getInputStream()))) {
      String s;
      while ((s = in.readLine()) != null) {
        System.out.println(s);
      }
    }

    System.exit(process.waitFor());
  }
}