handy git tool for doing efficient in-memory commit rebases & fixups

 git revise is a git subcommand to efficiently update, split, and
 rearrange commits. It is heavily inspired by git rebase, however it
 tries to be more efficient and ergonomic for patch-stack oriented
 workflows.
 .
 By default, git revise will apply staged changes to a target commit,
 then update HEAD to point at the revised history. It also supports
 splitting commits and rewording commit messages.
 .
 Unlike git rebase, git revise avoids modifying the working directory
 or the index state, performing all merges in-memory and only writing
 them when necessary. This allows it to be significantly faster on
 large codebases and avoids unnecessarily invalidating builds.