Hook-like behaviour including discovery of current git commit ID

[jacg]

I have a jj repository in which a PDF document is generated each time the source changes. Let's call it doc.pdf. I want something like a jj hook which creates a symlink named doc-version-<hash>.pdf, where <hash> is the immutable git commit ID of the current working copy. This link will have to be deleted when the next snapshot is made, so that there is only one versioned filename referring to this document at any given time.

Unless I've missed something, jj does not have hooks at present.

How might this be implemented?

Is there a better way of finding the git ID, than running jj log?

Is there a better way of keeping track of "the version of the source that generated the file that I gave to Fred"?

[The repo already uses just, mprocs and typst watch, in case that helps.]

[martinvonz]

Correct, we don't support any hooks yet. The hook we seem most likely to add first is one that would run before jj git push actually pushes.

Is there a better way of finding the git ID, than running jj log?

jj log --no-graph -T commit_id -r @ is good. (But let us know if there's a particular kind of "better" you're looking for.)

Is there a better way of keeping track of "the version of the source that generated the file that I gave to Fred"?

There isn't a better way; the commit ID is the best way.