From d97f2a2c585e9eb1df69a2a8d5aeef1c998af2e0 Mon Sep 17 00:00:00 2001
From: Georg Brandl <georg@python.org>
Date: Tue, 16 Sep 2008 07:49:27 +0000
Subject: [PATCH] Allow lexer guessing.

---
 CHANGES                | 3 +++
 sphinx/highlighting.py | 7 ++++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGES b/CHANGES
index 145290559..32a08a5f6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -66,6 +66,9 @@ New features added
   HTML, LaTeX and text translators; this prevents having to manually
   patch the classes.
 
+* Exposed Pygments' lexer guessing as a highlight "language"
+  ``guess``.
+
 * Added ``Sphinx.add_javascript()`` that adds scripts to load in the
   default HTML template.
 
diff --git a/sphinx/highlighting.py b/sphinx/highlighting.py
index b494b0725..1637b2c3f 100644
--- a/sphinx/highlighting.py
+++ b/sphinx/highlighting.py
@@ -21,7 +21,7 @@ try:
     from pygments import highlight
     from pygments.lexers import PythonLexer, PythonConsoleLexer, CLexer, \
          TextLexer, RstLexer
-    from pygments.lexers import get_lexer_by_name
+    from pygments.lexers import get_lexer_by_name, guess_lexer
     from pygments.formatters import HtmlFormatter, LatexFormatter
     from pygments.filters import ErrorToken
     from pygments.style import Style
@@ -157,6 +157,11 @@ class PygmentsBridge(object):
         elif lang in ('python3', 'py3') and source.startswith('>>>'):
             # for py3, recognize interactive sessions, but do not try parsing...
             lexer = lexers['pycon3']
+        elif lang == 'guess':
+            try:
+                lexer = guess_lexer(source)
+            except Exception:
+                return self.unhighlighted(source)
         else:
             if lang in lexers:
                 lexer = lexers[lang]