git-breakout-rebase

#!/bin/bash

set -e

if [ $# -lt 2 ]; then
  cat <<-EOT
	Usage: git breakout <branch_name> <commit>...

	    This command (ab)uses rebase to create a PR that contains
	    some commits taken from the current branch (or anywhere
	    else, really) and applied on top of origin/HEAD.

	    The PR is created from a new branch <branch_name> which is
	    only created in the origin remote repo.

	    <commit> may be given as either individual commits or commit ranges.

	    There are no sanity checks, use at your own risk!

	    Good luck!
	EOT
  exit 1
fi

BRANCH=$1
shift

GIT_SEQUENCE_EDITOR="(echo x git checkout origin/HEAD;
git rev-list --reverse --no-walk "$@" | xargs -I{} echo pick {};
echo x git push origin HEAD:refs/heads/${BRANCH};
echo x gh pr create -w --head ${BRANCH}
echo x git checkout $(git rev-parse HEAD)
) >" git rebase --keep-base --autostash --interactive