#!/bin/bash

function PrimaryXml {
        wget -q -O - "$1/repodata/repomd.xml" \
                | grep primary.xml \
                | sed -n -e 's/.*"\(.*\)".*/\1/p'
}

function GetPackages {
        BaseUrl="$1"
        # Packages end with - and start with /
        Include=`echo $2 | sed 's/ /-|\//g'`
        Exclude=`echo $3 | sed 's/ /-|\//g'`

        wget -q -O - "$BaseUrl`PrimaryXml $BaseUrl`" \
                | zcat \
                | sed -n -e 's/.*href="\([^"]*\)\".*/\1/p' \
                | grep -E "rpm$" \
                | ( [ -z "$Include" ] && cat || grep -E "($Include)" ) \
                | ( [ -z "$Exclude" ] && cat || grep -vE "($Exclude)" ) \
}

function DownloadPackages {
        BaseUrl="$1"

        Mode=0
        Include=""
        Exclude=""

        shift
        while (($#)); do
                if [[ "$1" == "-v" ]] ; then
                        Mode=1
                else
                        if [ $Mode -eq 1 ] ; then
                                Exclude="$Exclude $1"
                        else
                                Include="$Include $1"
                        fi
                fi

                shift
        done

        Packages=0

        GetPackages "$BaseUrl" "$Include" "$Exclude" | {
                while read i ; do
                        if [ ! -f `basename $i` ] ; then
                                test -d `dirname $i` || mkdir -p `dirname $i`

                                echo "Downloading $BaseUrl$i..."
                                wget -q -O "`basename $i`" "$BaseUrl$i"
                        fi
                        Packages=$((Packages+1))
                done

                echo "Download complete: $Packages from $BaseUrl"
        }
}