#!/bin/sh

# find rpm provides and requires for Haskell GHC libraries

[ $# -ne 2 ] && echo "Usage: $(basename $0) [--provides|--requires] %{buildroot}%{ghclibdir}" && exit 1

set +x

mode=$1

pkgbasedir=$2

pkgconfdir=$pkgbasedir/package.conf.d

ghc_pkg="/usr/lib/rpm/ghc-pkg-wrapper $pkgbasedir"

case $mode in

    --provides) field=id ;;

    --requires) field=depends ;;

    *) echo "$(basename $0): Need --provides or --requires"

       exit 1

       ;;

esac

ghc_ver=$(basename $pkgbasedir | sed -e s/ghc-//)

files=$(cat)

for i in $files; do

    case $i in

        # exclude builtin_rts.conf

        $pkgconfdir/*-*.conf)

            name=$(grep "^name: " $i | sed -e "s/name: //")

            ids=$($ghc_pkg field $name $field | sed -e "s/rts//" -e "s/bin-package-db-[^ ]\+//")

            for d in $ids; do

                case $d in

                    *-*) echo "ghc-devel($d)" ;;

                    *) ;;

                esac

            done

            ;;

        *)

            ;;

    esac

done