#!/bin/sh

/usr/bin/git fetch

UPSTREAM=${1:-'@{u}'}
LOCAL=$(/usr/bin/git rev-parse @)
REMOTE=$(/usr/bin/git rev-parse "$UPSTREAM")
BASE=$(/usr/bin/git merge-base @ "$UPSTREAM")

if [ $LOCAL = $REMOTE ]; then
    echo "Up-to-date"
elif [ $LOCAL = $BASE ]; then
    echo "Need to pull"

    #########
    # AD YOUR MADNESS HERE! SKY IS THE LIMIT
    #########

elif [ $REMOTE = $BASE ]; then
    echo "Need to push"
else
    echo "Diverged"
fi