#!/bin/bash

FILES_CHANGED_STR=`git diff --name-only $1@{1} $1`
FILES_CHANGED=${FILES_CHANGED_STR}

declare -A DIRS_SET 

for FILE in $FILES_CHANGED ; do
DIR=`echo $FILE | cut -d "/" -f1`

if test "${DIRS_SET[${DIR}]+isset}" 
    then
        continue
    else
        echo $DIR
fi
    DIRS_SET[${DIR}]=""
done