/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.idea.blaze.base.async.process;

import com.intellij.openapi.diagnostic.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

class ProcessUtil {
  private static final Logger logger = Logger.getInstance(ProcessUtil.class);

  public static Thread forwardAsync(final InputStream input, final OutputStream output) {
    Thread thread =
        new Thread(
            new Runnable() {
              @Override
              public void run() {
                int bufferSize = 4096;
                byte[] buffer = new byte[bufferSize];

                int read = 0;
                try {
                  read = input.read(buffer);
                  while (read != -1) {
                    output.write(buffer, 0, read);
                    read = input.read(buffer);
                  }
                } catch (IOException e) {
                  logger.warn("Error redirecting output", e);
                }
              }
            });
    thread.start();
    return thread;
  }
}