#!/usr/bin/env bash

usage() {
    echo "This script (un)links or unlinks the given to/from libreoffice home"
    echo
    echo "Usage: ${0##*/} [--unlink] filelist"
}

change_linking() {
    local libdir="$1"
    local filelist="$2"
    local linkfile=""
    local linkdir=""

    # If we are starting up then create the folder structure first
    if ${link_mode}; then
        for dir in `grep "%dir" ${filelist} | sed "s|%dir ||"` ; do
            mkdir -p "${dir/${datadir}/${libdir}}"
        done
    fi

    # Create link for each regular file or prune the link if removing
    for file in `grep -v "%dir" ${filelist} | sed "s|%config ||"` ; do
        linkfile=${file/${datadir}/${libdir}}
        if ${link_mode}; then
            ln -sf "${file}" "${linkfile}" || exit 1
        else
            # remove only empty (broken links)
            # there might be multiple deps providing the same
            if [[ -L "${linkfile}" && ! -r "${linfile}" ]]; then
                rm -f "${linkfile}" || exit 1
            fi
        fi
    done
    
    # Remove all empty dirs but validate if they do not belong
    # to some other pkg too
    if ! ${link_mode}; then
        for dir in `grep "%dir" ${filelist} | sed "s|%dir ||"` ; do
            linkdir="${dir/${datadir}/${libdir}}"
            # Check if dir is empty
            if [[ -d "${linkdir}" && -z `ls "${linkdir}"/*` ]]; then
                # check if nothing else owns the dir
                if [[ $(rpm -qf "${dir}" 2>/dev/null |wc -l) == 0 ]]; then
                    rmdir "${linkdir}" || exit 1
                fi
            fi
        done
    fi
}

# Global VARS
link_mode=true
datadir=/usr/share
libdirs=(
    "/usr/lib/"
    "/usr/lib64/"
    "/usr/lib32/"
)

if [[ "$1" == "--unlink" ]]; then
    link_mode=false
    shift
fi

if [[ "$1" == "--help" ]]; then
    usage
    exit 0
fi

# Verify we have just one left argument which is the filelist
if [[ $# > 1 || ! -f "$1" ]]; then
    usage
    exit 1
fi

for libdir in ${libdirs[@]}; do
    # for each dir verify there is libreoffice folder, otherwise skip
    if [[ ! -d "${libdir}/libreoffice/" ]]; then
        continue
    fi
    change_linking ${libdir} $1
done