mercurial/ui.py

--- a/mercurial/ui.py	Wed Aug 22 20:52:36 2018 +0900
+++ b/mercurial/ui.py	Sun Aug 26 13:09:35 2018 -0400
@@ -1052,6 +1052,7 @@
             command in self.configlist('pager', 'ignore')
             or not self.configbool('ui', 'paginate')
             or not self.configbool('pager', 'attend-' + command, True)
+            or encoding.environ.get('TERM') == 'dumb'
             # TODO: if we want to allow HGPLAINEXCEPT=pager,
             # formatted() will need some adjustment.
             or not self.formatted()