Add html mime type (#82)

Add html MIME type to the rendered html

python/circuitsvis/utils/render.py

@@ -3,6 +3,7 @@
 import subprocess
 import os
 from pathlib import Path
+from typing import Dict, Tuple, Union
 from urllib import request
 from uuid import uuid4
 
@@ -42,28 +43,29 @@ def __init__(self, local_src: str, cdn_src: str):
         self.local_src = local_src
         self.cdn_src = cdn_src
 
-    def _repr_html_(self) -> str:
+    def _repr_html_(self) -> Tuple[str, Dict]:
         """Jupyter/Colab HTML Representation
 
         When Jupyter sees this method, it renders the HTML.
 
         Returns:
-            str: HTML for Jupyter/Colab
+            HTML for Jupyter/Colab
         """
-        # Use local source if we're in dev mode
-        if is_in_dev_mode():
-            return self.local_src
+        # Use local source if we're in dev mode, or offline. Otherwise use the CDN.
+        src: str
+        if is_in_dev_mode() or not internet_on():
+            src = self.local_src
+        else:
+            src = self.cdn_src
 
-        # Use local source if we're offline
-        if not internet_on():
-            return self.local_src
-
-        # Otherwise use the CDN
-        return self.cdn_src
+        # Return html
+        mime = {"Content-Type": "text/html"}
+        return src, mime
 
     def __html__(self) -> str:
         """Used by some tooling as an alternative to _repr_html_"""
-        return self._repr_html_()
+        # Just return the source code (not the MIME data), as some tools may not support this.
+        return self._repr_html_()[0]
 
     def show_code(self) -> str:
         """Show the code as HTML source code

python/circuitsvis/utils/tests/test_render.py

@@ -37,7 +37,7 @@ def test_jupyter_renders(self):
         html = RenderedHTML(src, src)
 
         # Check the _repr_html_ method is defined (as Jupyter Lab displays this)
-        assert html._repr_html_() == src
+        assert html._repr_html_()[0] == src
 
     def test_show_code(self):
         src = "<p>Hi</p>"
@@ -85,10 +85,10 @@ def test_stringified_render_is_from_cdn(self, monkeypatch):
         res = render("Hello", name="Bob")
         assert str(res) == str(prod)
 
-    def test_jupyter_verson_is_from_local(self, monkeypatch):
+    def test_jupyter_version_is_from_local(self, monkeypatch):
         monkeypatch.setattr(circuitsvis.utils.render, "uuid4", lambda: "mock")
         monkeypatch.setattr(circuitsvis, "__version__", "1.0.0")
 
         dev = render_local("Hello", name="Bob")
         res = render("Hello", name="Bob")
-        assert res._repr_html_() == dev
+        assert res._repr_html_()[0] == dev