Update misaka lib to fix (#229); and fix compatibility with pygments (#208)

Lift off setup.cfg;
replaced misaka with mistune; thanks to papoteur-mga suggestion.
Create a new formatter instance for each highlight call to avoid the pygments >= 2.12.0 issue

Signed-off-by: Darren Nathanael <github@darrennathanael.com>

dpaste/highlight.py

@@ -1,4 +1,5 @@
 from logging import getLogger
+import mistune
 
 from django.apps import apps
 from django.template.defaultfilters import escape, linebreaksbr
@@ -73,15 +74,12 @@ class MarkdownHighlighter(PlainTextHighlighter):
     render_flags = ("skip-html",)
 
     def highlight(self, code_string, **kwargs):
-        import misaka
-
-        return mark_safe(
-            misaka.html(
-                code_string,
-                extensions=self.extensions,
-                render_flags=self.render_flags,
-            )
+        """Highlight Markdown using Mistune"""
+        markdown = mistune.create_markdown(
+            plugins=['table', 'footnotes', 'strikethrough', 'superscript',
+                    'fenced_code', 'quote', 'url']
         )
+        return mark_safe(markdown(code_string))
 
 
 class RestructuredTextHighlighter(PlainTextHighlighter):
@@ -140,7 +138,6 @@ class PygmentsHighlighter(Highlighter):
     determined by the lexer name.
     """
 
-    formatter = NakedHtmlFormatter()
     lexer = None
     lexer_fallback = PythonLexer()
 
@@ -152,7 +149,9 @@ class PygmentsHighlighter(Highlighter):
                 logger.warning("Lexer for given name %s not found", lexer_name)
                 self.lexer = self.lexer_fallback
 
-        return highlight(code_string, self.lexer, self.formatter)
+        # Create a new formatter instance for each highlight call to avoid the pygments >= 2.12.0 issue
+        formatter = NakedHtmlFormatter()
+        return highlight(code_string, self.lexer, formatter)
 
 
 class SolidityHighlighter(PygmentsHighlighter):

setup.cfg

@@ -30,7 +30,7 @@ python_requires = >=3.6
 install_requires =
     # Essential packages
     django>=3.2
-    pygments<=2.11.2
+    pygments
     django-staticinline>=1.0
     django-csp>=3.6
     dj_database_url>=0.5.0
@@ -39,6 +39,7 @@ install_requires =
     # Additional Lexer
     jsx-lexer>=0.0.8
     misaka>=2.1.0
+    mistune
     docutils
 
     # Testsuite