Added default lexer, Fix #746

codethesaurus/settings.py

@@ -177,5 +177,9 @@
     }
 }
 
+SIMILAR_LEXERS = {
+    "clips": "prolog",
+}
+
 # Configure Django App for Heroku.
 django_on_heroku.settings(locals(), test_runner=False, databases=False, staticfiles=True, logging=True)

web/views.py

@@ -16,6 +16,8 @@
 from pygments import highlight
 from pygments.formatters.html import HtmlFormatter
 from pygments.lexers import get_lexer_by_name
+from pygments.util import ClassNotFound
+from django.conf import settings
 
 from web.models import (
     Language,
@@ -307,6 +309,15 @@ def error_handler_500_server_error(request):
     response = render(request, 'error500.html')
     return HttpResponseServerError(response)
 
+#get lexer 
+def get_highlighter(language):
+    SIMILAR_LEXERS = settings.SIMILAR_LEXERS
+    try:
+        lexer = get_lexer_by_name(language, startinline=True)
+    except ClassNotFound:
+
+        lexer = get_lexer_by_name(SIMILAR_LEXERS.get(language, "text"), startinline=True)
+    return lexer
 
 # Helper functions
 def format_code_for_display(concept_key, lang):
@@ -322,9 +333,10 @@ def format_code_for_display(concept_key, lang):
     if lang.concept_unknown(concept_key) or lang.concept_code(concept_key) is None:
         return "Unknown"
     if lang.concept_implemented(concept_key):
+        lexer = get_highlighter(lang.key)
         return highlight(
             lang.concept_code(concept_key),
-            get_lexer_by_name(lang.key, startinline=True),
+            lexer,
             HtmlFormatter()
         )
     return None