diff -r 8c121a9837ca -r d110167610db mercurial/commands.py
--- a/mercurial/commands.py	Thu Apr 12 23:24:33 2018 +0900
+++ b/mercurial/commands.py	Thu Apr 12 23:25:58 2018 +0900
@@ -1318,7 +1318,7 @@
         fntemplate = ''
 
     if fntemplate:
-        fm = formatter.nullformatter(ui, 'cat')
+        fm = formatter.nullformatter(ui, 'cat', opts)
     else:
         ui.pager('cat')
         fm = ui.formatter('cat', opts)