git-current

#!/bin/bash

if [[ -z "$1" ]]; then
    ancestor=master
else
    ancestor=$1
    shift 1
fi
current="$ancestor"

ancestor=$(git rev-parse $ancestor)

for head in $(git rev-parse --branches); do
    if [[ $head != $ancestor ]]; then
	if git rev-list -30 $head | grep -q $ancestor; then
	    current="$current $(git describe --all --abbrev=0 $head | sed 's/heads\///')"
	fi
    fi
done

git show-branch $current