another command to use ffip-diff-*

[redguardtoo]

create a buffer containing diff content, set default-directory (check abo-abo ivy code),
enable ffip-diff-mode

[sten0]

On a closely related topic, I've been having trouble getting ffip-ffip-show-diff to pass on Debian's Continuous Integration infrastructure. Self-tests pass fine on the buildd infrastructure after a1ec308, but CI seems to be even more strict, and more limited, so I put in the time to try to run them without test.sh.

So far I've failed. I think the problem is ido-completing-read sets default-directory back to ./ (eg: find-file-in-project). The strange thing is set default-directory didn't work with dh_elpa's ert testing, but (cd "tests") did. I uploaded this branch here:
https://github.com/sten0/find-file-in-project/tree/experiment

BUILD-LOG-BACKTRACE has the backtrace. I wonder if this (#78) issue will also run into trouble with default-directory (whether on your end, or on Continous Integration). At any any rate, I hope my experiment failed in a way that's useful ;-)

[redguardtoo]

It's fine to use cd instead of setup default-directory in test cases. If you only change test cases, I'm OK to review and accept your pull request asap.

[sten0]

When reading through the commit history I found 8eedc93, and after reading that I realised why the CI tests were failing, and also that a1ec308 is no longer necessary.

Find-file-in-project now has continuous integration testing :-) Here's the link for current status and logs:
https://ci.debian.net/packages/f/find-file-in-project/

In conclusion, there seems to be something in Debian CI that prevents setting default-directory or ffip-project-root, but methods that depend on cd are ok, and getting default-directory works.

I believe my modifications to how tests are run are almost certainly Debian-specific, but here is the source for our package:
https://anonscm.debian.org/git/pkg-emacsen/pkg/find-file-in-project.git

[redguardtoo]

Good to know. Thanks.

[sten0]

You're welcome.

P.S. Re: abo-abo ivy code, Ivy/swiper tests run 100% fine out of the box, with no special configuration, so I'm guessing they're a good model :-)
https://ci.debian.net/packages/e/emacs-ivy/
https://buildd.debian.org/status/package.php?p=emacs-ivy