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-rw-r--r--gitsum.el4
1 files changed, 4 insertions, 0 deletions
diff --git a/gitsum.el b/gitsum.el
index ccef992..299f5fa 100644
--- a/gitsum.el
+++ b/gitsum.el
@@ -163,4 +163,8 @@ A numeric argument serves as a repeat count."
   (gitsum-diff-mode)
   (gitsum-refresh))
 
+;; viper compatible
+(eval-after-load "viper"
+  '(add-to-list 'viper-emacs-state-mode-list 'gitsum-diff-mode))
+
 (provide 'gitsum)