Block overwriting when creating sample project

novelwriter/core/coretools.py

@@ -513,6 +513,13 @@ class ProjectBuilder:
         """Make a copy of the sample project by extracting the
         sample.zip file to the new path.
         """
+        if path.exists():
+            SHARED.error(self.tr(
+                "The target folder already exists. "
+                "Please choose another folder."
+            ))
+            return False
+
         if (sample := CONFIG.assetPath("sample.zip")).is_file():
             try:
                 shutil.unpack_archive(sample, path)

tests/test_core/test_core_coretools.py

@@ -651,7 +651,7 @@ def testCoreTools_ProjectBuilderSample(monkeypatch, mockGUI, fncPath, tstPaths):
     data = {
         "name": "Test Sample",
         "author": "Jane Doe",
-        "path": fncPath,
+        "path": fncPath / "project",
         "sample": True,
     }
 
@@ -684,6 +684,9 @@ def testCoreTools_ProjectBuilderSample(monkeypatch, mockGUI, fncPath, tstPaths):
             zipObj.write(docFile, f"content/{docFile.name}")
 
     assert builder.buildProject(data) is True
+
+    # Can't create to the same target again
+    assert builder.buildProject(data) is False
     dstSample.unlink()
 
 # END Test testCoreTools_ProjectBuilderSample