Any experiences of anyone trying it out and switching over to it?
I would like to know more about the first class conflict handling. That could potentially be useful for an application I have in mind but I need to understand the algorithms better. How does it compare to CRDTs or other merge strategies?
I still had a few things I didn’t know how to do optimally, but it was close enough to be productive. Within a week I’d closed basically all of the gaps.
It’s been three or so months now and I’m never going back. It’s been so transformative I can barely remember all the innumerable frustrations and papercuts I used to put up with daily. Rebase conflicts. Juggling the stash. Ugh. I say this as someone who considered themselves extremely proficient with git. I mean, I wrote a compatible Ruby implementation of it over a decade and ago.
If it gains momentum, jj has a better chance than anything I’ve seen at finally dethroning git.
You can quickly see any commits that have merge conflicts. If some operation introduced them, you can go edit that commit and fix them. When you do so, the fix propagates forward automagically to all descendant commits. The benefit here is that the operation you were trying to do fully completes and you're never ejected into an intermediate state where changes are dropped into your working copy and you're expected to fix it right here and now before anything else happens. You don't have to unwind everything because you screwed up an earlier conflict resolution since everything is stored in history; you just go back to the commit you want to fix, make a change, and then jump back to the later commit that still needed some work.