--- a/mercurial/ui.py	Wed Jul 11 21:51:47 2018 +0900
+++ b/mercurial/ui.py	Wed Jul 11 22:06:04 2018 +0900
@@ -59,6 +59,8 @@
 interface = curses
 
 [commands]
+# Grep working directory by default.
+grep.all-files = True
 # Make `hg status` emit cwd-relative paths by default.
 status.relative = yes
 # Refuse to perform an `hg update` that would cause a file content merge