From e2021ca9d4a295a5584eaae7c5ca726bc4d0de6b Mon Sep 17 00:00:00 2001
From: Matthias Geier <Matthias.Geier@gmail.com>
Date: Sat, 20 Feb 2021 14:38:38 +0100
Subject: [PATCH] Disable automatic highlighting in notebooks

---
 doc/conf.py     |  3 ---
 doc/usage.ipynb | 28 +---------------------------
 src/nbsphinx.py |  1 +
 3 files changed, 2 insertions(+), 30 deletions(-)

diff --git a/doc/conf.py b/doc/conf.py
index bafdf091..9bd37e32 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -13,9 +13,6 @@
     'sphinx_last_updated_by_git',  # get "last updated" from Git
 ]
 
-# Default language for syntax highlighting in reST and Markdown cells:
-highlight_language = 'none'
-
 # Don't add .txt suffix to source files:
 html_sourcelink_suffix = ''
 
diff --git a/doc/usage.ipynb b/doc/usage.ipynb
index 7288d438..48287463 100644
--- a/doc/usage.ipynb
+++ b/doc/usage.ipynb
@@ -116,28 +116,6 @@
     "* `'sphinx_gallery.load_style'` to load CSS styles for [thumbnail galleries](subdir/gallery.ipynb)"
    ]
   },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "#### `highlight_language`\n",
-    "\n",
-    "Default language for syntax highlighting in reST and Markdown cells,\n",
-    "when no language is specified explicitly.\n",
-    "\n",
-    "By default, this is `'python3'`,\n",
-    "while Jupyter doesn't have a default language.\n",
-    "Set\n",
-    "[highlight_language](http://www.sphinx-doc.org/en/master/usage/configuration.html#confval-highlight_language)\n",
-    "to `'none'` to get the same behavior as in Jupyter:\n",
-    "\n",
-    "```python\n",
-    "highlight_language = 'none'\n",
-    "```\n",
-    "\n",
-    "See also [nbsphinx_codecell_lexer](#nbsphinx_codecell_lexer)."
-   ]
-  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -273,11 +251,7 @@
     "\n",
     "Default Pygments lexer for syntax highlighting in code cells.\n",
     "If available,\n",
-    "this information is taken from the notebook metadata instead.\n",
-    "\n",
-    "Please note that this is not the same as\n",
-    "[highlight_language](#highlight_language),\n",
-    "which is used for formatting code in Markdown cells!"
+    "this information is taken from the notebook metadata instead."
    ]
   },
   {
diff --git a/src/nbsphinx.py b/src/nbsphinx.py
index c4915a5a..104b1bdd 100644
--- a/src/nbsphinx.py
+++ b/src/nbsphinx.py
@@ -1049,6 +1049,7 @@ def parse(self, inputstring, document):
 
         if resources.get('nbsphinx_orphan', False):
             rst.Parser.parse(self, ':orphan:', document)
+        rst.Parser.parse(self, '.. highlight:: none', document)
         if env.config.nbsphinx_prolog:
             prolog = exporter.environment.from_string(
                 env.config.nbsphinx_prolog).render(env=env)