compile

#!/usr/bin/env bash
# bin/compile <build-dir> <cache-dir>

# Fail immediately on non-zero exit code.
set -e
# Fail immediately on non-zero exit code within a pipeline.
set -o pipefail
# Fail on undeclared variables.
set -u
# Debug, echo every command
#set -x

function indent() {
  c='s/^/       /'
  case $(uname) in
    Darwin) sed -l "$c";;
    *)      sed -u "$c";;
  esac
}

function export_env_dir() {
  local env_dir=$1
  local whitelist_regex=${2:-''}
  local blacklist_regex=${3:-'^(PATH|GIT_DIR|CPATH|CPPATH|LD_PRELOAD|LIBRARY_PATH|IFS)$'}
  if [ -d "$env_dir" ]; then
    for e in $(ls $env_dir); do
      echo "$e" | grep -E "$whitelist_regex" | grep -qvE "$blacklist_regex" &&
      export "$e=$(cat $env_dir/$e)"
      :
    done
  fi
}

BUILD_DIR=$1
CACHE_DIR=$2
ENV_DIR=$3
BP_DIR=`cd $(dirname $0); cd ..; pwd`

# Use architecture of multi-buildpack to compose behavior.
# https://github.com/heroku/heroku-buildpack-multi
cp $BP_DIR/.buildpacks $BUILD_DIR/.buildpacks
url=https://github.com/heroku/heroku-buildpack-multi.git
branch=""
dir=$(mktemp -t buildpackXXXXX)
rm -rf $dir

# Set env vars for the inner buildpacks in `.buildpacks`
# * Install `npm build` tooling.
export NPM_CONFIG_PRODUCTION=false

echo "=====> Downloading Buildpack: $url"

if [[ "$url" =~ \.tgz$ ]] || [[ "$url" =~ \.tgz\? ]]; then
  mkdir -p "$dir"
  curl -s "$url" | tar xvz -C "$dir" >/dev/null 2>&1
else
  git clone $url $dir >/dev/null 2>&1
fi
cd $dir

if [ "$branch" != "" ]; then
  git checkout $branch >/dev/null 2>&1
fi

chmod -f +x $dir/bin/{detect,compile,release}

framework=$($dir/bin/detect $1)

if [ $? == 0 ]; then
  echo "=====> Detected Framework: $framework"
  $dir/bin/compile $BUILD_DIR $CACHE_DIR $ENV_DIR

  if [ $? != 0 ]; then
    exit 1
  fi
else
  echo "create-react-app `.buildpacks` not defined. Exiting."
  exit 1
fi

export_env_dir "$ENV_DIR" '^(REACT_APP_|NODE_)'

if [ 'true' == "${REACT_APP_STATEFUL_BUILD-false}" ]; then
  echo '=====> Stateful build, now generating the JavaScript bundle'
  echo '       NOTICE: `REACT_APP_*` config vars will be compiled into'
  echo '       the slug. To update their values, push a new deployment.'
  cd $BUILD_DIR
  .heroku/node/bin/npm run build
else
  echo '=====> Stateless build, the JavaScript bundle will be generated on start-up'
fi

mkdir -p $BUILD_DIR/.profile.d
cp $BP_DIR/.profile.d/create-react-app.sh $BUILD_DIR/.profile.d/