Add Sphinx.add_lexer().

2 files changed, 7 insertions, 0 deletions

diff --git a/sphinx/application.py b/sphinx/application.py
index 6c644bbe..f7c57592 100644
--- a/sphinx/application.py
+++ b/sphinx/application.py
@@ -297,6 +297,12 @@ class Sphinx(object):
         StandaloneHTMLBuilder.script_files.append(
             posixpath.join('_static', filename))
 
+    def add_lexer(self, alias, lexer):
+        from sphinx.highlighting import lexers
+        if lexers is None:
+            return
+        lexers[alias] = lexer
+
 
 class TemplateBridge(object):
     """
diff --git a/sphinx/highlighting.py b/sphinx/highlighting.py
index 3017133a..d85aac23 100644
--- a/sphinx/highlighting.py
+++ b/sphinx/highlighting.py
@@ -30,6 +30,7 @@ try:
     from pygments.token import Generic, Comment, Number
 except ImportError:
     pygments = None
+    lexers = None
 else:
     class SphinxStyle(Style):
         """