Support the case when webpack project is not in the same root as gradle's one.

.idea/jsLibraryMappings.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptLibraryMappings">
+    <file url="file://$PROJECT_DIR$" libraries="{Node.js Core}" />
+  </component>
+</project>

src/main/groovy/KWP.groovy

@@ -5,11 +5,12 @@ import org.gradle.api.artifacts.ProjectDependency
 import java.util.zip.ZipFile
 class KWP implements Plugin<Project> {
+    private static def loaderText = KWP.class.getResourceAsStream("/kwp.js").text
+
     @Override
     void apply(Project target) {
         def rootProject = target.rootProject
         def targetDir = new File(rootProject.buildDir, "kwp")
-        def loaderText = getClass().getResourceAsStream("/kwp.js").text
         rootProject.afterEvaluate {
             targetDir.mkdirs()

src/main/resources/kwp.js

@@ -18,9 +18,10 @@ module.exports = function(content) {
     }
     var buildFile = path.resolve(loader.resourcePath);
+    var root = path.relative(buildFile, "../")
     var project = loader.resourceQuery.substr(1)
-    var gradle = "./gradlew"
+    var gradle = path.join(root, "gradlew")
     if (isWin) {
         gradle += ".bat"
     }
@@ -48,7 +49,7 @@ module.exports = function(content) {
         }
         else {
             // console.log(stdout)
-            var deps = fs.readFileSync(path.resolve('build/kwp/__deps.txt'), "UTF-8").split("\n")
+            var deps = fs.readFileSync(path.join(root, 'build/kwp/__deps.txt'), "UTF-8").split("\n")
             for (var i = 0; i < deps.length; i++) {
                 var t = deps[i].trim()
@@ -57,7 +58,7 @@ module.exports = function(content) {
                 }
             }
-            success(fs.readFileSync(path.resolve('build/kwp/__modules.js'), "UTF-8"))
+            success(fs.readFileSync(path.join(root, 'build/kwp/__modules.js'), "UTF-8"))
             console.timeEnd("Done Gradle")
         }
     })