Re: Equivalent of "fixup" for git filter-branch

quoted

I know there is `skip_commit` for git filter branch with
--commit-filter which squash the current commit with the next one,
however I have trouble finding a "fixup" equivalent that'd squash the
commit with the previous one (just like git rebase -i allows).

Probably doable with an index filter that updates the index for the
parent commit with the contents of the fixup commit and a commit filter
that skips the fixup commit.

Hum, I'm unsure about how this would look... can I use "git commit
--amend" inside a commit-filter?

Also, how can I know in advance that the next commit will be a fixup commit?

Thanks,
Philippe