#!/bin/sh
#
# Calculates the three hashes needed for a MacPort and outputs them
# in the proper format for easy copy'n'paste into the Portfile
#
# Usage: 
#
#  ./checksum.sh path/to/file  or
#  ./checksum.sh http://some.url/some.remote.file.tgz
#
# Example output:
#
# checksums           md5 45daad482c81175dfa8e66fd33b62585 \
#                     sha1 093001234a73004c97fa706119031f726a6671c3 \
#                     rmd160 10ab84e72c16f0df4eb7048583ebe879dfd4e55b
#
# (c) Thomas Keller <me@thomaskeller.biz>
#
# Licensed under GPLv3
#
if [ -z "$1" ]; then
   echo "No argument given"
   exit 1
fi

is_url=0

case "$1" in
   http*)
   	is_url=1
        file=/tmp/$0.$$
   	curl $1 >$file 2>/dev/null
        if [ ! -s "$file" ]; then
           echo "$1 could not be downloaded"
           exit 2
        fi
	;;
    *)
	file=$1
	;;
esac

if [ ! -e "$file" ]; then
   echo "'$file' does not exist"
   exit 3
fi

md5=`md5 "$file"`
sha1=`openssl sha1 "$file"`
rmd160=`openssl rmd160 "$file"`

if [ $is_url -eq 1 ]; then
   rm -f $file
fi

echo "checksums           md5${md5#*=} \\"
echo "                    sha1${sha1#*=} \\"
echo "                    rmd160${rmd160#*=}"