Usage: How to use with git diff next to git apply

[nobeh]

I am sure I am missing something that I do not know and I could find the in the manual.

Recently, I used a simple workflow as:

$ git diff > /tmp/my.patch
$ git apply < /tmp/my.patch
error: No valid patches in input (allow with "--allow-empty")

The root cause seems to be that difftastic does not generate the diff default character sequences; e.g. <, +, ... when I am creating the diff patch.

What's the correct usage in this case?

Thanks for making difftastic