Update save and show utilities (#451)

* Update save and show utilities

* Fixed flakes

hvplot/utilities.py

@@ -1,65 +1,26 @@
+import panel as _pn
 import holoviews as _hv
 
-from bokeh.io import export_png as _export_png, show as _show, save as _save
-from bokeh.resources import CDN as _CDN
-
 renderer = _hv.renderer('bokeh')
 
+save = _hv.save
 
-def save(obj, filename, title=None, resources=None):
-    """
-    Saves HoloViews objects and bokeh plots to file.
-
-    Parameters
-    ----------
-    obj : HoloViews object
-       HoloViews object to export
-    filename : string
-       Filename to save the plot to
-    title : string
-       Optional title for the plot
-    resources: bokeh resources
-       One of the valid bokeh.resources (e.g. CDN or INLINE)
-    """
-    if isinstance(obj, _hv.core.Dimensioned):
-        plot = renderer.get_plot(obj).state
-    else:
-        raise ValueError('%s type object not recognized and cannot be saved.' %
-                         type(obj).__name__)
-
-    if filename.endswith('png'):
-        _export_png(plot, filename=filename)
-        return
-    if not filename.endswith('.html'):
-        filename = filename + '.html'
-
-    if title is None:
-        title = 'hvPlot Plot'
-    if resources is None:
-        resources = _CDN
-
-    if obj.traverse(lambda x: x, [_hv.HoloMap]):
-        renderer.save(plot, filename)
-    else:
-        _save(plot, filename, title=title, resources=resources)
-
-
-def show(obj, filename=None):
+def show(obj, title=None, port=0, **kwargs):
     """
     Displays HoloViews objects in and outside the notebook
 
     Parameters
     ----------
     obj : HoloViews object
-       HoloViews object to export
+        HoloViews object to export
+    title : str
+        A string title to give the Document (if served as an app)
+    port: int (optional, default=0)
+        Allows specifying a specific port
+    **kwargs: dict
+        Additional keyword arguments passed to Panel show method.
     """
     if not isinstance(obj, _hv.core.Dimensioned):
         raise ValueError('%s type object not recognized and cannot be shown.' %
                          type(obj).__name__)
-
-    if obj.traverse(lambda x: x, [_hv.HoloMap]):
-        renderer.app(obj, show=True, new_window=True)
-    else:
-        from bokeh.io import output_file
-        output_file(filename or 'default.html')
-        _show(renderer.get_plot(obj).state)
+    _pn.pane.HoloViews(obj).show(title, port, **kwargs)