#!/usr/bin/env bash
# bin/compile BUILD_DIR CACHE_DIR

set -e

source $(dirname $0)/../scripts/functions
env

BUILD_DIR=$1
echo "Info: BUILD_DIR=$BUILD_DIR"
CACHE_DIR=$2
echo "Info: CACHE_DIR=$CACHE_DIR"

## CHECK BUILDPACK_GHC_BASE_URL is set
if [ "$BUILDPACK_GHC_BASE_URL" != "" ]; then
  arch=$(uname -m)
  ghcver=$GHC_BOOTSTRAP_VERSION
  if [ "$ghcver" == "" ]; then
    echo "Error: please set GHC_BOOTSTRAP_VERSION";
    exit 1;
  fi;
  bsdir=$CACHE_DIR/bootstrap
  ghcurl="$BUILDPACK_GHC_BASE_URL/$ghcver/ghc-$ghcver-$arch-unknown-linux.tar.bz2"
  echo "Info: bootstrap directory: ${bsdir}";
  echo "Info: bootstrap URL: $ghcurl";
  if [ -f "$bsdir.completed" ]; then
    echo "Info: already downloaded GHC bootstrap version ${ghcver}";
  else
    echo "Info: downloading GHC $ghcver form $ghcurl";
    $(downloadAndExtract $bsdir $ghcurl);
    $(configureMakeInstall $bsdir/ghc-$ghcver $BUILD_DIR/bootstrap/ghc-$ghcver);
    touch $bsdir.completed
  fi;
else
  echo "Error: please set BUILDPACK_GHC_BASE_URL";
  exit 1;
fi