Initial commit. Utility methods to call out to the system shell.

.gitignore

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+*.sw?
+build/
+.gradle/

build.gradle

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+apply plugin: 'groovy'
+apply plugin: 'maven'
+
+group = 'com.jdbernard'
+
+version = '0.1.0'
+
+dependencies {
+  compile localGroovy()
+}

src/main/groovy/com/jdbernard/gradle/ShellUtil.groovy

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+package com.jdbernard.gradle
+
+// ## Utility methods for working with processes.
+public class ShellUtil {
+
+  public static void shell_(List<String> cmd) { shell(cmd, null, false) }
+  public static void shell_(String... cmd) { shell(cmd, null, false) }
+  public static void shell(String... cmd) { shell(cmd, null, true) }
+
+  public static void shell(List<String> cmd, File workingDir, boolean checkExit) {
+      shell(cmd as String[], workingDir, checkExit) }
+
+  public static void shell(String[] cmd, File workingDir, boolean checkExit) {
+      def pb = new ProcessBuilder(cmd)
+      if (workingDir) pb.directory(workingDir)
+      def process = pb.start()
+      process.waitForProcessOutput(System.out, System.err)
+
+      if (process.exitValue() != 0)
+          println "Command $cmd exited with non-zero result code."
+      if (checkExit) assert process.exitValue() == 0 : "Not ignoring failed command." }
+
+  public static void shell(List<List<String>> cmds, File workingDir) {
+      cmds.each {
+          ProcessBuilder pb = new ProcessBuilder(it)
+          pb.directory(workingDir)
+          pb.start().waitForProcessOutput(System.out, System.err) } }
+
+  public static void spawn(String... cmd) { spawn(cmd, null) }
+  public static void spawn(List<String> cmd, File workingDir) { spawn(cmd as String[], workingDir) }
+  public static void spawn(String[] cmd, File workingDir) {
+      def pb = new ProcessBuilder(cmd)
+      if (workingDir) pb.directory(workingDir)
+      def process = pb.start() }
+}