#!/bin/sh
set -eu

DATE="$1"
VERSION="$2"
VVERSION="v$2"

if git show "$VVERSION" 1>/dev/null 2>/dev/null; then
  echo "Version '$VVERSION' already exists." >&2
  exit 1
fi

if [ "$DATE" != "$(git log -1 --format=%cd --date=short HEAD)" ]; then
  echo "Date '$DATE' is not up-to-date." >&2
  exit 1
fi

if ! grep -q "^# $VERSION - $DATE$" CHANGELOG.md; then
  echo "Missing '# $VERSION - $DATE' entry from CHANGELOG.md" >&2
  exit 1
fi

git tag "$VVERSION"