Don't use PYTHONPATH if it is the same as the project path.

edu.cuny.hunter.hybridize.core/src/edu/cuny/hunter/hybridize/core/refactorings/HybridizeFunctionRefactoringProcessor.java

@@ -1,6 +1,7 @@
 package edu.cuny.hunter.hybridize.core.refactorings;
 
 import static com.google.common.collect.Iterables.concat;
+import static edu.cuny.hunter.hybridize.core.utils.Util.getPath;
 import static java.lang.Boolean.TRUE;
 import static java.util.stream.Collectors.toList;
 import static org.eclipse.core.runtime.Platform.getLog;
@@ -20,6 +21,7 @@
 import org.eclipse.core.resources.IProjectNature;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.ILog;
+import org.eclipse.core.runtime.IPath;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.core.runtime.OperationCanceledException;
 import org.eclipse.core.runtime.Status;
@@ -66,6 +68,7 @@
 import edu.cuny.hunter.hybridize.core.analysis.UndeterminablePythonSideEffectsException;
 import edu.cuny.hunter.hybridize.core.descriptors.HybridizeFunctionRefactoringDescriptor;
 import edu.cuny.hunter.hybridize.core.messages.Messages;
+import edu.cuny.hunter.hybridize.core.utils.Util;
 import edu.cuny.hunter.hybridize.core.wala.ml.EclipsePythonProjectTensorAnalysisEngine;
 import edu.cuny.hunter.hybridize.core.wala.ml.PythonModRefWithBuiltinFunctions;
 
@@ -280,6 +283,18 @@ private RefactoringStatus checkFunctions(IProgressMonitor monitor) throws Operat
 		for (IProject project : projectToFunctions.keySet()) {
 			// create the analysis engine for the project.
 			List<File> pythonPath = getPythonPath(project);
+			assert pythonPath.stream().allMatch(File::exists) : "PYTHONPATH should exist.";
+
+			// if they PYTHONPATH is the same as the project path, don't use it.
+			if (pythonPath.size() == 1) {
+				File pythonPathEntry = pythonPath.get(0);
+				IPath projectPath = getPath(project);
+				File projectPathFile = projectPath.toFile();
+
+				if (pythonPathEntry.equals(projectPathFile))
+					pythonPath = null;
+			}
+
 			LOG.info("PYTHONPATH for " + project + " is: " + pythonPath + ".");
 
 			EclipsePythonProjectTensorAnalysisEngine engine = new EclipsePythonProjectTensorAnalysisEngine(project, pythonPath);

edu.cuny.hunter.hybridize.core/src/edu/cuny/hunter/hybridize/core/utils/Util.java

@@ -18,6 +18,7 @@
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.ILog;
+import org.eclipse.core.runtime.IPath;
 import org.eclipse.jface.text.Document;
 import org.eclipse.jface.text.IDocument;
 import org.eclipse.ltk.core.refactoring.Refactoring;
@@ -160,4 +161,13 @@ private static IProject getProject(PythonNode pythonNode) {
 		IProject project = resource.getProject();
 		return project;
 	}
+
+	public static IPath getPath(IProject project) {
+		IPath path = project.getFullPath();
+
+		if (!path.toFile().exists())
+			path = project.getLocation();
+
+		return path;
+	}
 }

edu.cuny.hunter.hybridize.core/src/edu/cuny/hunter/hybridize/core/wala/ml/EclipsePythonProjectTensorAnalysisEngine.java

@@ -1,5 +1,6 @@
 package edu.cuny.hunter.hybridize.core.wala.ml;
 
+import static edu.cuny.hunter.hybridize.core.utils.Util.getPath;
 import static org.eclipse.core.runtime.Platform.getLog;
 
 import java.io.File;
@@ -20,6 +21,8 @@
 import com.ibm.wala.classLoader.ModuleEntry;
 import com.ibm.wala.ide.classloader.EclipseSourceDirectoryTreeModule;
 
+import edu.cuny.hunter.hybridize.core.utils.Util;
+
 public class EclipsePythonProjectTensorAnalysisEngine extends PythonTensorAnalysisEngine {
 
 	private static final String PYTHON3_INTERPRETER_FQN = "com.ibm.wala.cast.python.util.Python3Interpreter";
@@ -66,15 +69,6 @@ public EclipsePythonProjectTensorAnalysisEngine(IProject project, List<File> pyt
 		}
 	}
 
-	private static IPath getPath(IProject project) {
-		IPath path = project.getFullPath();
-
-		if (!path.toFile().exists())
-			path = project.getLocation();
-
-		return path;
-	}
-
 	public IProject getProject() {
 		return project;
 	}