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I think one major difference between git and jj is how immutable their DAG is, due to the difference in how they refer to their unit of change (i.e. stable change ID with changing commit IDs vs. immutable commit ID). One implication of that is change history in a git repo feels much more immutable to the one in a jj repo. Consequently operations that involves changing the history like, undo/rebase feels much easier/flexible. Is my understanding correct?

by steveklabnik3 hours ago|

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Sorta! I think it can feel that way at times, but also the opposite. jj’s changes are immutable in the same way commits are, when you modify a change, it makes a new immutable commit and associates that with the change. So on the literal level, they’re the same.

But it’s true that mutating history is easy and sometimes even automatic with jj, whereas it’s not with git. So that could make it feel more mutable. On the other hand, jj has the concept of mutable vs immutable commits; jj will present you from modifying certain changes unless you pass in a flag to override it. So in some ways, it’s more immutable than git.

Just really depends on your perspective.

by klauserc8 hours ago|

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jj automatically hides "uninteresting" changes. Most of the time, this is good.

Occasionally, I need to see more changes. It is not obvious to me how I get jj to show me elided changes. I mean, sure, I can explicitly ask jj to show me the one ancestor of the last visible change, and then show me the ancestor of that one, etc. Is some flag to say: "just show me 15 more changes that you would otherwise elide"?

by steveklabnik8 hours ago|

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I use `jj log -r ..` for that, which is just an open ended range. It's not the "15 more" but it's what's worked for me. I suspect you could do it with some sort of revset stuff, but I like to keep it simple.

by nickisnoble8 hours ago|

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Easy: `jj log -n 25`

(Default is 10 iirc, so if you want 15 more... 25)

If you want everything, ever: `jj log -r ::`

Or every ancestor of your current change: `jj log -r ..@`

by steveklabnik7 hours ago|

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IIRC -n only limits the output, not expands it. jj log and jj long -n 25 show the same results for me.