Don't process shebangs in codehilite when processing fenced code

Fixes Python-Markdown#1156.

Author: facelessuser

.gitignore

@@ -69,3 +69,6 @@ ENV/
 
 # MkDocs documentation
 site/
+
+# Mac files
+.DS_Store

docs/change_log/release-3.3.md

@@ -102,6 +102,7 @@ The following bug fixes are included in the 3.3 release:
 * Fix complex scenarios involving lists and admonitions (#1004).
 * Fix complex scenarios with nested ordered and unordered lists in a definition list (#918).
 * Fix corner cases with lists under admonitions.
+* Don't process shebangs in fenced code blocks when using CodeHilite (#1156).
 
 [spec]: https://www.w3.org/TR/html5/text-level-semantics.html#the-code-element
 [fenced_code]: ../extensions/fenced_code_blocks.md

markdown/extensions/codehilite.py

@@ -112,7 +112,7 @@ def __init__(self, src, **options):
 
         self.options = options
 
-    def hilite(self):
+    def hilite(self, shebang=True):
         """
         Pass code to the [Pygments](http://pygments.pocoo.org/) highliter with
         optional line numbers. The output should then be styled with css to
@@ -125,7 +125,7 @@ def hilite(self):
 
         self.src = self.src.strip('\n')
 
-        if self.lang is None:
+        if self.lang is None and shebang:
             self._parseHeader()
 
         if pygments and self.use_pygments:

markdown/extensions/fenced_code.py

@@ -116,7 +116,7 @@ def run(self, lines):
                         **local_config
                     )
 
-                    code = highliter.hilite()
+                    code = highliter.hilite(shebang=False)
                 else:
                     id_attr = lang_attr = class_attr = kv_pairs = ''
                     if lang:

tests/test_syntax/extensions/test_fenced_code.py

@@ -381,6 +381,36 @@ def setUp(self):
         if has_pygments and pygments.__version__ != required_pygments_version:
             self.skipTest(f'Pygments=={required_pygments_version} is required')
 
+    def test_shebang(self):
+
+        if has_pygments:
+            expected = '''
+            <div class="codehilite"><pre><span></span><code>#!test
+            </code></pre></div>
+            '''
+        else:
+            expected = '''
+            <pre class="codehilite"><code>#!test
+            </code></pre>
+            '''
+
+        self.assertMarkdownRenders(
+            self.dedent(
+                '''
+                ```
+                #!test
+                ```
+                '''
+            ),
+            self.dedent(
+                expected
+            ),
+            extensions=[
+                markdown.extensions.codehilite.CodeHiliteExtension(linenums=None, guess_lang=False),
+                'fenced_code'
+            ]
+        )
+
     def testFencedCodeWithHighlightLines(self):
         if has_pygments:
             expected = self.dedent(