#!/bin/sh

[ $# -ne 1 ] && echo "Usage: $0 lib-ver[.tar.gz]" && exit 1

INPUT=$1

case $INPUT in
    */*) INPUT=$(basename $INPUT) ;;
esac

INPUT=$(echo $INPUT | sed -e "s/.tar.gz//")

VERSION=$(echo $INPUT | sed -e "s/[A-Za-z-]*-//")

NAME=$(echo $INPUT | sed -e "s/-$VERSION//")

[ -r ghc-$NAME.spec ] && echo "ghc-$NAME.spec already exists!" && exit 1

cp /usr/share/ghc/cabal-lib-template.spec ghc-$NAME.spec

echo "created ghc-$NAME.spec"

sed -i -e "s/@PACKAGE@/$NAME/" -e "s/@GHC_VERSION@/$(ghc --numeric-version)/" -e "s/@VERSION@/$VERSION/" -e "s/@DATE@/`date +\"%a %b %e %Y\"`/" ghc-$NAME.spec