#!/bin/bash

if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail

SCRIPTNAME=$(basename $0)
function show_options () {
    echo "Usage: $SCRIPTNAME -d <directory>"
    echo
    echo "Options:"
    echo "    -d          -- directory to search for package-uninstalls-* files"
    exit 1
}

TEMP=$(getopt -o hd: -n $SCRIPTNAME -- "$@")
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
eval set -- "$TEMP"

WORKDIR=

while true ; do
    case "$1" in
        -d) WORKDIR=$2; shift 2;;
        -h) show_options;;
        --) shift ; break ;;
        *) echo "Error: unsupported option $1."; exit 1;;
    esac
done

if [ -z "$WORKDIR" ]; then
    show_options
fi

PACKAGES=

for PACKAGEFILE in $(find $WORKDIR -maxdepth 1 -name "package-installs-*" ); do
    basefile=$(basename $PACKAGEFILE)
    element_name=${basefile#"package-installs-"}
    while read pkg; do
        if [ -z "$pkg" ]; then
            continue
        fi
        # Ignore comments
        if [ ${pkg:0:1} = "#" ]; then
            continue
        fi
        if [ ! ${pkg:0:1} = "-" ]; then
            continue
        fi

        if [ -e /usr/share/pkg-map/$element_name ]; then
            # map the package to its true name
            pkg=$(pkg-map --element $element_name $pkg)
        fi

        pkg=${pkg:1}
        PACKAGES="$PACKAGES $pkg"
    done < $PACKAGEFILE
done

install-packages -e $PACKAGES