#!/usr/bin/env bash
# Usage: script/release
#
# - checks out the master branch
# - changes version in `bin/ruby-build` to current date
# - commits and tags the change
# - pushes master + tag to GitHub
# - opens pull request to update the Homebrew formula
#
# TODO: handle making multiple releases on the same date

set -e

git fetch -q --tags origin master

existing="$(git tag --points-at HEAD)"
if [ -n "$existing" ]; then
  echo "Aborting: HEAD is already tagged as '${existing}'" >&2
  exit 1
fi

git checkout -q master

binfile="bin/ruby-build"
new_version="$(date '+%Y%m%d')"
version_tag="v${new_version}"
previous_tag="$(git tag | grep '^v' | sort | tail -1)"

if git diff --quiet "${previous_tag}..HEAD" -- bin share; then
  echo "Aborting: No features to release since '${previous_tag}'" >&2
  exit 1
fi

sed -i.bak -E "s!^(RUBY_BUILD_VERSION=).+!\\1\"${new_version}\"!" "$binfile"
rm -f "${binfile}.bak"

git commit -m "ruby-build ${new_version}" "$binfile"
git tag "$version_tag"
git push origin master "${version_tag}"

{ echo "ruby-build ${new_version}"
  echo
  git log --no-merges --format='%w(0,0,2)* %B' --reverse "${previous_tag}..HEAD^" -- bin share
} | hub release create -dF - "$version_tag" || true

script/brew-publish ruby-build rbenv/ruby-build "$version_tag"