issue#174 lib directory overwritten when lib directory exists. The on…

…ly situation where there needs to be a lib directory in the root of the local deployment is when pyvis is generating the html

for a notebook and the notebook is serving the contents locally. This was some legacy code that was not as thouroughly checked when the last deployment went live and because of how it was coded
the lib directory would get overwritten only when there was already a lib directory present.

pyvis/network.py

@@ -508,9 +508,18 @@ def write_html(self, name, local=True, notebook=False):
             out.write(self.html)
 
         if notebook:
-            if os.path.exists("lib"):
-                shutil.rmtree(f"lib")
-                shutil.copytree(f"{os.path.dirname(__file__)}/templates/lib", "lib")
+            with open(name, "w+") as out:
+                out.write(self.html)
+            return IFrame(name, width=self.width, height=self.height)
+        elif notebook and local:
+            if not os.path.exists("lib"):
+                os.makedirs(os.path.dirname("lib"))
+            if not os.path.exists("lib/bindings"):
+                shutil.copytree(f"{os.path.dirname(__file__)}/templates/lib/bindings", "lib/bindings")
+            if not os.path.exists("lib/tom-select"):
+                shutil.copytree(f"{os.path.dirname(__file__)}/templates/lib/tom-select", "lib/tom-select")
+            if not os.path.exists("lib/bindings"):
+                shutil.copytree(f"{os.path.dirname(__file__)}/templates/lib/vis-9.1.2", "lib/vis-9.1.2")
             with open(name, "w+") as out:
                 out.write(self.html)
             return IFrame(name, width=self.width, height=self.height)