BokehRenderer.save now includes necessary HTML assets (#1547)

holoviews/plotting/bokeh/renderer.py

@@ -93,6 +93,12 @@ def __call__(self, obj, fmt=None, doc=None):
         elif fmt == 'json':
             return self.diff(plot), info
 
+    @bothmethod
+    def _save_prefix(self_or_cls, ext):
+        "Hook to prefix content for instance JS when saving HTML"
+        if ext == 'html':
+            return '\n'.join(self_or_cls.html_assets()).encode('utf8')
+        return
 
     @bothmethod
     def get_plot(self_or_cls, obj, doc=None, renderer=None):

holoviews/plotting/renderer.py

@@ -474,6 +474,9 @@ def save(self_or_cls, obj, basename, fmt='auto', key={}, info={}, options=None,
         if rendered is None: return
         (data, info) = rendered
         encoded = self_or_cls.encode(rendered)
+        prefix = self_or_cls._save_prefix(info['file-ext'])
+        if prefix:
+            encoded = prefix + encoded
         if isinstance(basename, BytesIO):
             basename.write(encoded)
             basename.seek(0)
@@ -482,6 +485,11 @@ def save(self_or_cls, obj, basename, fmt='auto', key={}, info={}, options=None,
             with open(filename, 'wb') as f:
                 f.write(encoded)
 
+    @bothmethod
+    def _save_prefix(self_or_cls, ext):
+        "Hook to prefix content for instance JS when saving HTML"
+        return
+
 
     @bothmethod
     def get_size(self_or_cls, plot):