add preferences around diff command

.emacs.el

@@ -595,6 +595,20 @@ return nil if LIB unfound and downloading failed, otherwise the path of LIB."
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; mode関連
 
+(setq diff-switches "-u")
+(add-hook 'diff-mode-hook
+          (lambda ()
+            (view-mode 1)
+            ;; (set-face-foreground 'diff-file-header-face "black")
+            (set-face-foreground 'diff-index-face "blue")
+            (set-face-foreground 'diff-hunk-header-face "magenda")
+            (set-face-foreground 'diff-removed-face "red")
+            ;; (set-face-background 'diff-removed-face "gray26")
+            (set-face-foreground 'diff-added-face "blue")
+            ;;  (set-face-background 'diff-added-face "gray26")
+            (set-face-foreground 'diff-changed-face "syan")
+            ))
+
 ;; (ffap-bindings)
 
 (add-hook 'sh-mode-hook