#!/bin/bash

# goo.gl link creator and decoder

case "$1" in
create)

if [ $# -ne 2 ] 
then
 echo "url to shorten needed."
 exit
fi
curl -s -d "url=${2}" http://goo.gl/api/url | sed -n "s/.*:\"\([^\"]*\).*/\1/p";
;;

decode)

if [ $# -ne 2 ] 
then
 echo "url to decode needed"
 exit
fi

check=$(echo $2 | sed -n 's/.*\(http:\/\/goo.gl\/[A-Za-z0-9][A-Za-z0-9]*\).*/\1/p');

if [ -n "$(echo $check)" ]; then 
curl -sI $2 | sed -n 's/Location:.* //p';
else
echo "you must give a valid goo.gl link"
fi
;;
*)

if which curl >/dev/null; then 

echo "Usage: `basename $0` {create|decode}" >&2

else 
    echo "curl missing from your system, please install it";
fi 

exit 64
;;
esac