modeline: work for the first N lines and add a test to keep it that way

1 files changed, 5 insertions, 4 deletions

diff --git a/pygments/modeline.py b/pygments/modeline.py
index 2200f1cf..43c1784f 100644
--- a/pygments/modeline.py
+++ b/pygments/modeline.py
@@ -35,9 +35,10 @@ def get_filetype_from_buffer(buf, max_lines=5):
         ret = get_filetype_from_line(l)
         if ret:
             return ret
-    for l in lines[max_lines:-1:-1]:
-        ret = get_filetype_from_line(l)
-        if ret:
-            return ret
+    for i in range(max_lines, -1, -1):
+        if i < len(lines):
+            ret = get_filetype_from_line(lines[i])
+            if ret:
+                return ret
 
     return None