#!/bin/sh

VERSION=$1

if [ -z "$VERSION" ]; then
   echo "Usage: $0 X.Y.Z"
   exit 1
fi

#set +x

#FIXME lib
LIBDIR=/usr/lib64/ghc-$VERSION
if [ ! -d "$LIBDIR" ]; then
   echo "$0: $LIBDIR does not exist: please install ghcX.Y first"
   exit 1
fi

ARCH=$(arch)

# stack/Cabal doesn't know ppc64le
if [ "$ARCH" = "ppc64le" ]; then
    ARCH=ppc64
fi

STACK_PROGRAMS=$HOME/.stack/programs/$ARCH-linux

STACK_GHCDIR=${STACK_PROGRAMS}/ghc-tinfo6-$VERSION

if [ -e "$STACK_GHCDIR" ]; then
   echo "$0: $STACK_GHCDIR exists: to replace, please remove first"
   exit 0
fi

mkdir -p $STACK_GHCDIR/bin

for i in ghc ghc-pkg ghci hp2ps hpc hsc2hs runghc runhaskell; do
    if [ -x /usr/bin/$i-$VERSION ]; then
        ln -s /usr/bin/$i-$VERSION $STACK_GHCDIR/bin/$i
    elif [ -x /usr/bin/$i-ghc-$VERSION ]; then
        ln -s /usr/bin/$i-ghc-$VERSION $STACK_GHCDIR/bin/$i
    else
        ln -s /usr/bin/$i $STACK_GHCDIR/bin/$i
    fi
done

ln -s /usr/bin/haddock-ghc-$VERSION $STACK_GHCDIR/bin/haddock

if [ ! -f "${STACK_GHCDIR}.installed" ]; then
    echo "installed" > $STACK_GHCDIR.installed
fi