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/* NSC -- new Scala compiler
* Copyright 2005-2011 LAMP/EPFL
*/
package scala.tools.nsc
package io
import concurrent.ThreadRunner
import scala.annotation.tailrec
import scala.util.Properties.{ isWin, isMac, lineSeparator }
import scala.util.control.Exception.catching
import java.lang.{ Process => JProcess, ProcessBuilder => JProcessBuilder }
import java.io.{ IOException, InputStream, OutputStream, BufferedReader, InputStreamReader, PrintWriter, File => JFile }
import java.util.concurrent.LinkedBlockingQueue
/** The <code>Process</code> object contains convenience functions
* for running external processes.
*
* An example usage:
* <pre>
* io.Process("ls", cwd = io.File("/")) foreach println
* </pre>
*
* See http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4109888
* for a dated list of the many obstacles to a clean interface.
*
* This is not finished!! Do not rely upon it yet.
*
* TODO - remove requirement that process complete before we
* can get an iterator.
*
* @author Paul Phillips
* @since 2.8
*/
object Process
{
def javaVmArguments: List[String] = {
import collection.JavaConversions._
java.lang.management.ManagementFactory.getRuntimeMXBean().getInputArguments().toList
}
lazy val runtime = Runtime.getRuntime()
class Pipe[T](xs: Seq[T], stringify: T => String) {
def |(cmd: String): Seq[String] = {
val p = Process(cmd)
xs foreach (x => p.stdin println stringify(x))
p.stdin.close()
p.stdout.toList
}
}
object Pipe {
/* After importing this implicit you can say for instance
* xs | "grep foo" | "grep bar"
* and it will execute shells and pipe input/output. You can
* also implicitly or explicitly supply a function which translates
* the opening sequence into Strings; if none is given toString is used.
*
* Also, once you use :sh in the repl, this is auto-imported.
*/
implicit def seqToPipelinedProcess[T]
(xs: Seq[T])
(implicit stringify: T => String = (x: T) => x.toString): Pipe[T] =
{
new Pipe(xs, stringify)
}
}
private[Process] class ProcessBuilder(val pb: JProcessBuilder) {
def this(cmd: String*) = this(new JProcessBuilder(cmd: _*))
def start() = new Process(() => pb.start())
def withOnlyEnv(env: Map[String, String]): this.type = {
pb.environment.clear()
withEnv(env)
}
def withEnv(env: Map[String,String]): this.type = {
if (env != null) {
val jmap = pb.environment()
for ((k, v) <- env) jmap.put(k, v)
}
this
}
def withCwd(cwd: Path): this.type = {
if (cwd != null)
pb directory cwd.jfile
this
}
def withRedirectedErrorStream(merged: Boolean): this.type = {
pb redirectErrorStream merged
this
}
override def toString() = "ProcessBuilder(%s)" format pb.command()
}
// This can be fleshed out if more variations come up
private val shell: String => Array[String] =
if (isWin) Array("cmd.exe", "/C", _)
else Array("sh", "-c", _)
/** Executes the given command line in a shell.
*
* @param command the command line
* @return a Process object
*/
def apply(
command: String,
env: Map[String, String] = null,
cwd: Path = null,
redirect: Boolean = false
): Process =
exec(shell(command), env, cwd, redirect)
/** Executes the given command line.
*
* @param command the command line
* @return a Process object
*/
def exec(
command: Seq[String],
env: Map[String, String] = null,
cwd: Path = null,
redirect: Boolean = false
): Process =
new ProcessBuilder(command: _*) withEnv env withCwd cwd withRedirectedErrorStream redirect start
}
import Process._
class Process(processCreator: () => JProcess) extends Iterable[String] {
lazy val process = processCreator()
def exitValue(): Option[Int] =
catching(classOf[IllegalThreadStateException]) opt process.exitValue()
def waitFor() = process.waitFor()
def destroy() = process.destroy()
def rerun() = new Process(processCreator)
def slurp() = _out.slurp()
def stdout = iterator
def iterator = _out.iterator
def stderr = _err.iterator
lazy val stdin = new PrintWriter(_in, true)
class StreamedConsumer(in: InputStream) extends Thread with Iterable[String] {
private val queue = new LinkedBlockingQueue[String]
private val reader = new BufferedReader(new InputStreamReader(in))
private def finish() {
// make sure this thread is complete
join()
}
def slurp(): String = {
finish()
queue.toArray map (_ + lineSeparator) mkString
}
def iterator = {
finish()
new Iterator[String] {
val it = queue.iterator()
def hasNext = it.hasNext
def next = it.next
}
}
override final def run() {
@tailrec def loop() {
reader.readLine match {
case null =>
reader.close()
case x =>
queue put x
loop()
}
}
try loop()
catch { case _: IOException => () }
}
}
private val _err = createConsumer(process.getErrorStream)
private val _out = createConsumer(process.getInputStream)
private val _in = process.getOutputStream()
private def createConsumer(in: InputStream) = {
val t = new StreamedConsumer(in)
t setDaemon true
t.start()
t
}
override def toString() = "Process(%s)" format process.toString()
}
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