Yay. Btw, one more improvement. TIL xargs will skip blank inputs (depending on bsd/gnu xargs, flags etc...), so my version above:

    rif = "!f() { rev=$(git pick-commit); [[ $rev ]] && git ri $rev~; }; f"

can just be:

    rif = !git pick-commit | xargs -tI% git ri %~