git-object-contains-which-refs

#!/bin/bash
# for all refs, check which are, and which aren't included in the given object.
refs=$(git show-ref | cut -d' ' -f2)
echo "== refs contained within object $1: =="
git log $1 --decorate=full | grep --color=auto -F "$refs"
echo "== refs not contained within object $1: =="
for ref in $refs; do
	git log $1 --decorate=full | grep -qF "$ref" || echo $ref
done