Passthrough for non-diff output

[craigfurman]

I've recently started using this library, to redact diffs that pertain to secret files from logs. It would be great if (Multi)FileDiffReader could yield content that is not part of a valid diff, so that the caller has the choice of whether or not to print it.

For example, the program colordiff will successfully print non-diff output, allowing it to be used to process input that is mixed diff and non-diff content.

What do you think of this feature, and would you be interested in a PR that implements it?

[keegancsmith]

cc @mrnugget @eseliger

[mrnugget]

That sounds reasonable - if the implemenation doesn't become convoluted, I think we'd accept a PR, yes :)

[craigfurman]

OK, I've had a go at it here: #60

let me know what you think 🙂