From 91781b1a631b431ed4e0a4ac34784b0bb4e87ea2 2016-04-27 10:48:43
From: Matthias Bussonnier <bussonniermatthias@gmail.com>
Date: 2016-04-27 10:48:43
Subject: [PATCH] Merge pull request #9411 from parleur/pager_fix

Replace 'less -r' call by 'less -R' providing bad wrapping
---

diff --git a/IPython/core/page.py b/IPython/core/page.py
index b3f06e6..ec2e077 100644
--- a/IPython/core/page.py
+++ b/IPython/core/page.py
@@ -298,7 +298,7 @@ def get_pager_cmd(pager_cmd=None):
     Makes some attempts at finding an OS-correct one.
     """
     if os.name == 'posix':
-        default_pager_cmd = 'less -r'  # -r for color control sequences
+        default_pager_cmd = 'less -R'  # -R for color control sequences
     elif os.name in ['nt','dos']:
         default_pager_cmd = 'type'
 
@@ -308,8 +308,8 @@ def get_pager_cmd(pager_cmd=None):
         except:
             pager_cmd = default_pager_cmd
     
-    if pager_cmd == 'less' and '-r' not in os.environ.get('LESS', ''):
-        pager_cmd += ' -r'
+    if pager_cmd == 'less' and '-r' not in os.environ.get('LESS', '').lower():
+        pager_cmd += ' -R'
     
     return pager_cmd