fixes #557

Author: jph00

fastcore/_modidx.py

@@ -616,6 +616,7 @@
                                 'fastcore.xtras.dumps': ('xtras.html#dumps', 'fastcore/xtras.py'),
                                 'fastcore.xtras.get_source_link': ('xtras.html#get_source_link', 'fastcore/xtras.py'),
                                 'fastcore.xtras.globtastic': ('xtras.html#globtastic', 'fastcore/xtras.py'),
+                                'fastcore.xtras.hl_md': ('xtras.html#hl_md', 'fastcore/xtras.py'),
                                 'fastcore.xtras.image_size': ('xtras.html#image_size', 'fastcore/xtras.py'),
                                 'fastcore.xtras.is_listy': ('xtras.html#is_listy', 'fastcore/xtras.py'),
                                 'fastcore.xtras.join_path_file': ('xtras.html#join_path_file', 'fastcore/xtras.py'),

fastcore/xtras.py

@@ -9,7 +9,7 @@
            'repr_dict', 'is_listy', 'mapped', 'IterLen', 'ReindexCollection', 'get_source_link', 'truncstr',
            'sparkline', 'modify_exception', 'round_multiple', 'set_num_threads', 'join_path_file', 'autostart',
            'EventTimer', 'stringfmt_names', 'PartialFormatter', 'partial_format', 'utc2local', 'local2utc', 'trace',
-           'modified_env', 'ContextManagers', 'shufflish', 'console_help']
+           'modified_env', 'ContextManagers', 'shufflish', 'console_help', 'hl_md']
 
 # %% ../nbs/03_xtras.ipynb 2
 from .imports import *
@@ -566,3 +566,13 @@ def console_help(
             nm = S.bold.light_blue(e.name)
             print(f'{nm:45}{e.load().__doc__}')
 
+
+# %% ../nbs/03_xtras.ipynb 159
+def hl_md(s, lang='xml', show=True):
+    "Syntax highlight `s` using `lang`."
+    md = f'```{lang}\n{s}\n```'
+    if not show: return md
+    try:
+        from IPython import display
+        return display.Markdown(md)
+    except ImportError: print(s)

nbs/03_xtras.ipynb

@@ -2358,6 +2358,55 @@
     "            print(f'{nm:45}{e.load().__doc__}')\n"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "#| export\n",
+    "def hl_md(s, lang='xml', show=True):\n",
+    "    \"Syntax highlight `s` using `lang`.\"\n",
+    "    md = f'```{lang}\\n{s}\\n```'\n",
+    "    if not show: return md\n",
+    "    try:\n",
+    "        from IPython import display\n",
+    "        return display.Markdown(md)\n",
+    "    except ImportError: print(s)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "When we display code in a notebook, it's nice to highlight it, so we create a function to simplify that:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/markdown": [
+       "```xml\n",
+       "<test><xml foo=\"bar\">a child</xml></test>\n",
+       "```"
+      ],
+      "text/plain": [
+       "<IPython.core.display.Markdown object>"
+      ]
+     },
+     "execution_count": null,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "hl_md('<test><xml foo=\"bar\">a child</xml></test>')"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},