/*
 * Copyright (c) 2002-2016, the original author or authors.
 *
 * This software is distributable under the BSD license. See the terms of the
 * BSD license in the documentation provided with this software.
 *
 * http://www.opensource.org/licenses/bsd-license.php
 */
package jdk.internal.org.jline.utils;

import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.util.Objects;

Helper methods for running unix commands.
/** * Helper methods for running unix commands. */
public final class ExecHelper { private ExecHelper() { } public static String exec(boolean redirectInput, final String... cmd) throws IOException { Objects.requireNonNull(cmd); try { Log.trace("Running: ", cmd); ProcessBuilder pb = new ProcessBuilder(cmd); if (redirectInput) { pb.redirectInput(ProcessBuilder.Redirect.INHERIT); } Process p = pb.start(); String result = waitAndCapture(p); Log.trace("Result: ", result); if (p.exitValue() != 0) { if (result.endsWith("\n")) { result = result.substring(0, result.length() - 1); } throw new IOException("Error executing '" + String.join(" ", (CharSequence[]) cmd) + "': " + result); } return result; } catch (InterruptedException e) { throw (IOException) new InterruptedIOException("Command interrupted").initCause(e); } } public static String waitAndCapture(Process p) throws IOException, InterruptedException { ByteArrayOutputStream bout = new ByteArrayOutputStream(); InputStream in = null; InputStream err = null; OutputStream out = null; try { int c; in = p.getInputStream(); while ((c = in.read()) != -1) { bout.write(c); } err = p.getErrorStream(); while ((c = err.read()) != -1) { bout.write(c); } out = p.getOutputStream(); p.waitFor(); } finally { close(in, out, err); } return bout.toString(); } private static void close(final Closeable... closeables) { for (Closeable c : closeables) { if (c != null) { try { c.close(); } catch (Exception e) { // Ignore } } } } }