#!/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