#!/bin/sh

set -e

CPAN=${CPAN:-"http://www.cpan.org"}
packages=$HOME/.cpan/sources/modules/02packages.details.txt.gz

quiet=''
only_url=0

help() {
    cat <<END
Usage: $( basename $0 ) [options] [module [module [...]]]

Options:

    -h          Print this message
    -n          Don't download, only print URLs
    -q          Work quietly

END
}

for n in "$@" ; do
    if [ "$( echo '' "$n" | sed 's/^ //;s/^\(.\).*$/\1/' )" = "-" ] ; then
        shift
        for arg in $( echo '' "$n" | sed 's/^ //;s/^-//;s/./ &/g' ) ; do
            case $arg in
                [h?])
                    help
                    exit 0
                    ;;
                n)
                    only_url=1
                    ;;
                q)
                    quiet='-s'
                    ;;
                *)
                    echo "Unknown option '$arg'."
                    help
                    exit 1
                    ;;
            esac
        done
    else
        break
    fi
done

if [ $# -eq 0 ] ; then
    help
    exit 1
fi

mkdir -p $( dirname $packages )


(cd $(dirname $packages) && wget -q -nc $CPAN/modules/$( basename $packages ) )

for module in "$@" ; do
    tar=$( zgrep '^'$module' ' $packages | awk '{print $3}' )

    if [ -z "$tar" ] ; then
        echo "Can't find $module, skipping..." >&2
        continue
    fi

    if [ $only_url -eq 0 ] ; then
        curl $quiet -R -o "$( basename $tar )" $CPAN/authors/id/$tar
    else
        echo "$module: $CPAN/authors/id/$tar"
    fi
done

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