在传递给“git diff”之前添加某些过滤器

Question

在“git diff”中显示的差异之前，是否可以对文件应用某些过滤器，例如“fmt -w 80”？因此，当我想看到差异时，线条会自动断开。

以下是通过fmt -w 20的示例。

原始文件

This is a very very very long line.

修改过的文件

This is a very very very very long line.

定期结果：

-This is a very very very long line.
+This is a very very very very long line.

通过过滤器后：

 This is a very very
-very long line.
+very very long line.

P.S。我知道git diff --color-words可以显示单词的不同，但我只想逐行看到它。