Parent gemInstallDir under $project.buildDir

Fixes #28

Author: R. Tyler Croy

src/main/groovy/com/lookout/jruby/GemUtils.groovy

@@ -14,16 +14,18 @@ class GemUtils {
 
     static Boolean extractGem(Project p, File gem) {
         String gemName = gemFullNameFromFile(gem.getName())
-        String installDir = p.jruby.gemInstallDir
-        File extractDir = new File("./${installDir}/gems/${gemName}")
+        // Wherever our gems will be installed, we need to make sure the
+        // directory exists since `p.exec` will silently fail
+        new File(p.gemInstallDir).mkdirs()
+        File extractDir = new File("${p.gemInstallDir}/gems/${gemName}")
 
         if (extractDir.exists()) {
             return
         }
 
         p.exec {
             executable "gem"
-            args 'install', gem, "--install-dir=./${installDir}", '--no-ri', '--no-rdoc'
+            args 'install', gem, "--install-dir=${p.gemInstallDir}", '--no-ri', '--no-rdoc'
         }
     }
 

src/main/groovy/com/lookout/jruby/JRubyPlugin.groovy

@@ -13,6 +13,10 @@ class JRubyPlugin implements Plugin<Project> {
         project.apply plugin: 'war'
         project.extensions.create('jruby', JRubyPluginExtension, project)
 
+        project.ext {
+            gemInstallDir = "${project.buildDir}/${project.jruby.gemInstallDir}"
+        }
+
         project.repositories {
             maven {
                 // The url is in a closure to ensure that we can overwrite this
@@ -101,7 +105,7 @@ class JRubyPlugin implements Plugin<Project> {
             from "$project.buildDir/classes/main"
             // Bring our vendored gems into the created war file
             webInf {
-                from project.jruby.gemInstallDir
+                from project.gemInstallDir
                 into 'gems'
             }