Build jps-builder using only Java 1.6 compatible .classes

Fixes #290
Fixes #293
Fixes #295
Fixes #302
Fixes #313

In IntelliJ 14.1, all of openapi.jar targets Java 1.6 (with
MAJOR.MINOR 50.0), but in IntelliJ 2016.1, some of openapi.jar targets
only Java 1.8 (with MAJOR.MINOR 52.0), since jps-builders require parts
of openapi.jars and must target Java 1.6 even for IntelliJ 2016.1, the
52.0 .classes needed to be ported into org.elixir_lang.jps.builder, so
that the 52.0 version in openapi.jar wouldn't be attempted to be loaded.

This ended up being 5 classes:

* ExecutionException
* GeneralCommandLine
* ParametersList
* ParamsGroup
* ProcessNotCreatedException

Only GeneralCommandLine was used directly, all others are dependencies
of it.

CONTRIBUTING.md

@@ -84,6 +84,7 @@ doctoc .
 
 #### IntelliJ IDEA
 
+##### For Plugin
 An IntelliJ Platform Plugin SDK must be setup to develop plugins, but the paths are tied to the version of IntellIJ IDEA
 you have installed, so you will likely need to fix the paths to match your environment.
 
@@ -101,7 +102,7 @@ you have installed, so you will likely need to fix the paths to match your envir
             1. You can download [JDK 1.6 from Apple](https://support.apple.com/kb/DL1572?locale=en_US)
         3. Click OK
     5. In the “Select Home Directory for IntelliJ Platform Plugin SDK” select the IntelliJ IDEA Community Edition
-       Contents: `/Applications/IntelliJ IDEA 15 CE.app/Contents`.
+       Contents: `/Applications/IntelliJ IDEA 14.1 CE.app/Contents`.
         **NOTE: Use Community Edition even if you have IntelliJ IDEA Ultimate Edition installed, so that the built
                 plugin works with Community Edition.**
     6. In the “Select Internal Java  Platform” window
@@ -114,6 +115,50 @@ you have installed, so you will likely need to fix the paths to match your envir
         4. In the “Detected Roots” window, click “OK” to add all roots.
     8. Click OK to close “Project Structure”
 
+##### For JPS Builder Compile Server
+
+Compile servers must be compatible all the way back to Java 1.6, but they also link to `openapi.jar`, which in new IntelliJ versions, like 2016.1, contains Java 1.8 only (`MAJOR.MINOR` `52.0`) `.class` files.  To ensure the jps-builder module is built so it will only use Java 1.6 compatible `.class` files in IntelliJ 14.1 through IntelliJ 2016.1, a separate, minimal IntelliJ Platform Plugin SDK is used for the `jps-builder` and `jps-shared` modules.
+
+ 1. Files > Project Structure
+ 2. In the "Project Structure" window
+     1. Select Platform Settings > SDKs
+    2. Click “+”
+    3. Chose “IntelliJ Platform Plugin SDK”
+    4. A modal **may** pop-up saying “Cannot Create SDK”, “You need to configure a Java SDK first”.
+        1. Click OK
+        2. In the “Select Home Directory for JDK” select the JDK 1.6 directory:
+           “/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home”.
+           **NOTE: JDK 1.6 is used, even though it is unsupported by Oracle, to give the greatest compatibility with
+                   older JetBrains IDE versions**
+            1. You can download [JDK 1.6 from Apple](https://support.apple.com/kb/DL1572?locale=en_US)
+        3. Click OK
+    5. In the “Select Home Directory for IntelliJ Platform Plugin SDK” select the IntelliJ IDEA Community Edition
+       Contents: `/Applications/IntelliJ IDEA 14.1 CE.app/Contents`.
+        **NOTE: Use Community Edition even if you have IntelliJ IDEA Ultimate Edition installed, so that the built
+                plugin works with Community Edition.**
+    6. In the “Select Internal Java  Platform” window
+        1. Select “1.6”
+        2. Click OK
+    7. Select the “IntelliJ IDEA Community Edition” SDK.
+        1. Change the Name to "IntelliJ IDEA Community Edition (JPS-Builder)"
+        2. Minimize the number of jars included from "IntelliJ IDEA Community Edition"
+            1. Select all `/Applications/IntelliJ IDEA 14.1 CE.app/Contents` jars
+            2. Unselect (with Cmd+Click) the minimal jars needed
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/annotations.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/jdom.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/jps-model.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/jps-server.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/openapi.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/trove4j.jar` 
+                * `/Applications/IntelliJ IDEA 14.1 CE.app/Contents/lib/util.jar` 
+            3. Click the - Icon to remove the unneeded jars
+        3. Add the Sourcepath
+            1. Select the Sourcepath tab
+            2. Click the + Icon
+            3. Select “~/git/JetBrains/intellij-community”
+            4. In the “Detected Roots” window, click “OK” to add all roots.
+    8. Click OK to close “Project Structure”
+
 #### IntelliJ Erlang
 
 In order to integrate with [IntelliJ Erlang](https://github.com/ignatov/intellij-erlang), we need it as a jar to access

intellij-elixir.iml

@@ -14,7 +14,7 @@
       <excludeFolder url="file://$MODULE_DIR$/dependencies" />
       <excludeFolder url="file://$MODULE_DIR$/tmp" />
     </content>
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="IntelliJ IDEA Community Edition IC-141.3056.4" jdkType="IDEA JDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="module-library">
       <library name="JUnit4">

jps-builder/jps-builder.iml

@@ -6,8 +6,10 @@
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
       <sourceFolder url="file://$MODULE_DIR$/tests" isTestSource="true" />
     </content>
-    <orderEntry type="inheritedJdk" />
+    <orderEntry type="jdk" jdkName="IntelliJ IDEA Community Edition IC-141.3056.4 (JPS-Builder)" jdkType="IDEA JDK" />
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="module" module-name="jps-shared" />
+    <orderEntry type="library" scope="TEST" name="idea" level="project" />
+    <orderEntry type="library" scope="TEST" name="junit-4.12" level="project" />
   </component>
 </module>

jps-builder/src/org/elixir_lang/jps/builder/ElixirBuilder.java

@@ -1,16 +1,28 @@
 package org.elixir_lang.jps.builder;
 
-import com.intellij.execution.ExecutionException;
-import com.intellij.execution.configurations.GeneralCommandLine;
+// 52.0 in openapi.jar
+// import com.intellij.execution.ExecutionException;
+// 52.0 in openapi.jar
+//import com.intellij.execution.configurations.GeneralCommandLine;
+// 50.0 in util.jar
 import com.intellij.execution.process.BaseOSProcessHandler;
+// 50.0 in util.jar
 import com.intellij.execution.process.ProcessAdapter;
+// 50.0 in util.jar
 import com.intellij.openapi.diagnostic.Logger;
+// 50.0 in util.jar
 import com.intellij.openapi.util.io.FileUtil;
+// 49.0 in util.jar
 import com.intellij.openapi.util.io.FileUtilRt;
+// 50.0 in util.jar
 import com.intellij.openapi.util.text.StringUtil;
+// 50.0 in util.jar
 import com.intellij.util.CommonProcessors;
+// 49.0 in util.jar
 import com.intellij.util.Function;
+// 50.0 in util.jar
 import com.intellij.util.containers.ContainerUtil;
+// 49.0 in trove4j.jar
 import gnu.trove.THashSet;
 import org.elixir_lang.jps.mix.JpsMixConfigurationExtension;
 import org.elixir_lang.jps.model.ElixirCompilerOptions;
@@ -19,21 +31,37 @@
 import org.elixir_lang.jps.model.JpsElixirSdkType;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.builders.BuildOutputConsumer;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.builders.DirtyFilesHolder;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.builders.FileProcessor;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.CompileContext;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.ProjectBuildException;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.TargetBuilder;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.messages.BuildMessage;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.messages.CompilerMessage;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.resources.ResourcesBuilder;
+// 50.0 in jsp-builders.jar
 import org.jetbrains.jps.incremental.resources.StandardResourceBuilderEnabler;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.JpsDummyElement;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.JpsProject;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.java.JavaSourceRootType;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.java.JpsJavaExtensionService;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.library.sdk.JpsSdk;
+// 50.0 in openapi.jar
 import org.jetbrains.jps.model.module.*;
 
 import java.io.File;

jps-builder/src/org/elixir_lang/jps/builder/ExecutionException.java

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2016 Luke Imhoff
+ * Copyright 2000-2009 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.elixir_lang.jps.builder;
+
+public class ExecutionException extends Exception {
+    public ExecutionException(final String s) {
+        super(s);
+    }
+
+    public ExecutionException(final Throwable cause) {
+        super(cause == null ? null : cause.getMessage(), cause);
+    }
+
+    public ExecutionException(final String s, Throwable cause) {
+        super(s, cause);
+    }
+}