- Indicate that the schema file in the tree view is non-physical to prevent conflicts with Kotlin PSI file intention (#18)

- Switched from deprecated NodeJS Utils to NodeJsInterpreterManager to ensure compatibility with 2016.x versions
(cherry picked from commit 6137f80)

Author: jimmeyer-els

src/main/com/intellij/lang/jsgraphql/languageservice/JSGraphQLNodeLanguageServiceInstance.java

@@ -15,8 +15,9 @@
 import com.intellij.execution.process.ProcessOutputTypes;
 import com.intellij.ide.plugins.IdeaPluginDescriptor;
 import com.intellij.ide.plugins.PluginManager;
-import com.intellij.javascript.nodejs.NodeDetectionUtil;
-import com.intellij.javascript.nodejs.NodeSettingsUtil;
+import com.intellij.javascript.nodejs.interpreter.NodeJsInterpreter;
+import com.intellij.javascript.nodejs.interpreter.NodeJsInterpreterManager;
+import com.intellij.javascript.nodejs.interpreter.local.NodeJsLocalInterpreter;
 import com.intellij.lang.jsgraphql.JSGraphQLDebugUtil;
 import com.intellij.lang.jsgraphql.ide.project.JSGraphQLLanguageUIProjectService;
 import com.intellij.openapi.application.Application;
@@ -84,14 +85,11 @@ public JSGraphQLNodeLanguageServiceInstance(@NotNull Project project) {
     }
 
     public static String getNodeInterpreter(Project project) {
-        String interpreterPath = NodeSettingsUtil.getInterpreterPath(project);
-        if(interpreterPath == null) {
-            File interpreterInPath = NodeDetectionUtil.findInterpreterInPath();
-            if(interpreterInPath != null) {
-                interpreterPath = interpreterInPath.getAbsolutePath();
-            }
-        }
-        return interpreterPath;
+	    final NodeJsInterpreter nodeJsInterpreter = NodeJsInterpreterManager.getInstance(project).getDefault();
+	    if(nodeJsInterpreter instanceof NodeJsLocalInterpreter) {
+		    return ((NodeJsLocalInterpreter) nodeJsInterpreter).getInterpreterSystemDependentPath();
+	    }
+	    return null;
     }
 
     private void createProcessHandler() {

src/main/com/intellij/lang/jsgraphql/schema/psi/JSGraphQLSchemaFile.java

@@ -10,6 +10,7 @@
 import com.intellij.extapi.psi.PsiFileBase;
 import com.intellij.lang.jsgraphql.schema.JSGraphQLSchemaFileType;
 import com.intellij.lang.jsgraphql.schema.JSGraphQLSchemaLanguage;
+import com.intellij.lang.jsgraphql.schema.ide.project.JSGraphQLSchemaLanguageProjectService;
 import com.intellij.openapi.fileTypes.FileType;
 import com.intellij.psi.FileViewProvider;
 import com.intellij.psi.search.ProjectScope;
@@ -41,4 +42,13 @@ public String toString() {
         return "GraphQL Schema File";
     }
 
+    @Override
+    public boolean isPhysical() {
+        if(Boolean.TRUE.equals(getVirtualFile().getUserData(JSGraphQLSchemaLanguageProjectService.IS_GRAPHQL_SCHEMA_VIRTUAL_FILE))) {
+            // indicate that the psi file that backs the "GraphQL Schemas" project tree node is considered non-physical.
+            // this hides it from PSI file intentions etc.
+            return false;
+        }
+        return super.isPhysical();
+    }
 }