git-splay

#!/bin/bash

set -e

USAGE="git splay BASE PREFIX {CMD}

For each commit in BASE..HEAD, create a new branch PREFIX/N which is that commit, rebased onto BASE.
If PREFIX is '-', prompts for each name.
If CMD is given, runs that CMD for each branch thus created.
Example: Create branches and push them:
  git splay master changes git push
"

if [ "$#" -lt 2 ]; then
	echo "$USAGE" >&2
	exit 1
fi

BASE="$1"
PREFIX="$2"
shift 2

COMMITS=($(git log --format=%H "$BASE..")) # split on whitespace and make array

n=0
for commit in "${COMMITS[@]}"; do
	if [ "$PREFIX" == "-" ]; then
		git --no-pager show --quiet "$commit"
		echo
		read -p "Branch name? " branch
	else
		branch="$PREFIX/$((n++))"
	fi
	git branch "$branch" "$BASE"
	git checkout "$branch"
	git cherry-pick "$commit"
	[ "$#" -gt 0 ] && "$@"
done

# This seems as sane a choice as any to leave the state in
echo "Done. Returning to $BASE"
git checkout "$BASE"