Fix eclipse location with spaces issue, and throw exception if current path contains a ! as it will screw over a lot of java's paths.

Author: LexManos

src/main/java/net/minecraftforge/gradle/common/BasePlugin.java

@@ -48,6 +48,12 @@ public final void apply(Project arg)
         project.getLogging().addStandardErrorListener(listenner);
         project.getGradle().addBuildListener(listenner);
 
+        if (project.getBuildDir().getAbsolutePath().contains("!"))
+        {
+            project.getLogger().error("Build path has !, This will screw over a lot of java things as ! is used to denote archive paths, REMOVE IT if you want to continue");
+            throw new RuntimeException("Build path contains !");
+        }
+
         // extension objects
         project.getExtensions().create(Constants.EXT_NAME_MC, getExtensionClass(), project);
         project.getExtensions().create(Constants.EXT_NAME_JENKINS, JenkinsExtension.class, project);

src/main/java/net/minecraftforge/gradle/user/UserBasePlugin.java

@@ -838,9 +838,9 @@ public void finalCall()
     protected void fixEclipseProject(String path)
     {
         File f = new File(path);
-        if (f.exists() && f.length() == 0)
+        if (f.exists())// && f.length() == 0)
         {
-            String projectDir = "URI//file:/" + project.getProjectDir().getAbsolutePath().replace('\\', '/');
+            String projectDir = "URI//" + project.getProjectDir().toURI().toString();
             try
             {
                 FileOutputStream fos = new FileOutputStream(f);