pager: do not enable when TERM=dumb
Before this, running hg in emacs' M-x shell started `less`, which
would complain about the terminal not being fully functional.
Differential Revision: https://phab.mercurial-scm.org/D4376
--- 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()