cd "$(dirname "$0")"

DATE=$(date -u "+%Y-%m-%d %H:%M:%SZ")
YEAR=$(date -u "+%Y")

# ./tools/make_release exports VERSION, so use that if available
if [ -n "$VERSION" ]; then
  VERSION="v${VERSION}"
else
  VERSION="v$(echo "$(grep version ../package.json | cut -d\" -f4)-$(git describe --always)")"
fi

# print preamble, substituting variables
cat ../src/preamble.js |
sed -e "s/{{VERSION}}/$VERSION/g" \
    -e "s/{{YEAR}}/$YEAR/g" \
    -e "s/{{DATE}}/$DATE/g"