#!/usr/bin/env bash

set -e

STACKAGE2NIX_WORK_DIR=${STACKAGE2NIX_WORK_DIR:-$HOME}
STACKAGE_REPO=${STACKAGE_REPO:-$STACKAGE2NIX_WORK_DIR/lts-haskell}
ALL_CABAL_HASHES_REPO=${ALL_CABAL_HASHES_REPO:-$STACKAGE2NIX_WORK_DIR/all-cabal-hashes}
STACK_FILE=${STACK_YAML:-stack.yaml}

if [ ! -d "$STACKAGE_REPO" ]; then
  git clone --depth 1 https://github.com/commercialhaskell/lts-haskell.git "$STACKAGE_REPO"
fi

if [ ! -d "$ALL_CABAL_HASHES_REPO" ]; then
  git clone --branch hackage https://github.com/commercialhaskell/all-cabal-hashes.git "$ALL_CABAL_HASHES_REPO"
fi

set -x
time stackage2nix \
  --lts-haskell "$STACKAGE_REPO" \
  --all-cabal-hashes "$ALL_CABAL_HASHES_REPO" \
  --hackage-db "$HOME/.cabal/packages/hackage.haskell.org/01-index.tar" \
  --with-stackage-closure \
  "$STACK_FILE"

nix-build -o "result-$(basename $STACK_FILE)" -A stackage2nix "$@"