I'm using Mercurial with the evolve extension. Is there a revision specifier that means "the Nth first parent in the obslog for revision X"?
After I rebase a commit I would like to be able to quickly get the diff between the pre-rebased version of the commit and the post-rebased version. (Something similar to Git's @{1} revision specifier.)
You can reference the first parent in obslog (called precursor) by using the following revset: hg log -r "precursors(.)" --hidden. The problem is that you can have multiple precursors for a single revision.
If you are sure you have a linear obsolescence history, you can access the Nth parent by calling precursors several times: hg log -r "precursors(precursors(.))".