#!/usr/bin/env bash
# shellcheck disable=SC2257

failed=0
fail() {
  echo "$(tput setaf 1)$*$(tput sgr0)"
  failed=1
}

if git diff | grep -q ""
then
  fail "There are uncommited changes"
fi

current=$(git tag --points-at)
if [[ -z "$current" ]]
then
  fail "No git tag on the current commit"
  echo "Create one with:   git tag -a v0.0.0"
fi

if [[ "$current" != v* ]]
then
  fail "Bad tag format: expected v0.0.0"
fi

if [[ "$(git cat-file -t "$current")" != "tag" ]]
then
  fail "Current tag is not annotated (required for Snap)."
fi

if [[ "$(git tag --points-at master)" != "$current" ]]
then
  fail "You are not on master"
fi

version=${current#v}
if ! grep "Version:" ShellCheck.cabal | grep -qFw "$version"
then
  fail "The cabal file does not match tag version $version"
fi

if ! grep -qF "## $current" CHANGELOG.md
then
  fail "CHANGELOG.md does not contain '## $current'"
fi

if [[ $(git log -1 --pretty=%B) != "Stable version "* ]]
then
  fail "Expected git log message to be 'Stable version ...'"
fi

i=1 j=1
cat << EOF

Manual Checklist

$((i++)). Make sure none of the automated checks above failed
$((i++)). Make sure Travis build currently passes: https://travis-ci.org/koalaman/shellcheck
$((i++)). Make sure SnapCraft build currently works: https://build.snapcraft.io/user/koalaman
$((i++)). Run test/distrotest to ensure that most distros can build OOTB.
$((i++)). Format and read over the manual for bad formatting and outdated info.
$((i++)). Make sure the Hackage package builds, so that all files are 

Release Steps

$((j++)). \`cabal sdist\` to generate a Hackage package
$((j++)). \`git push --follow-tags\` to push commit
$((j++)). Wait for Travis to build
$((j++)). Verify release:
  a. Check that the new versions are uploaded: https://shellcheck.storage.googleapis.com/index.html
  b. Check that the docker images have version tags: https://hub.docker.com/u/koalaman
$((j++)). If no disaster, upload to Hackage: http://hackage.haskell.org/upload
$((j++)). Push a new commit that updates CHANGELOG.md
EOF
exit "$failed"