#!/usr/bin/env nix
#! nix shell nixpkgs#bash nixpkgs#gnused --command bash

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
cd "$SCRIPT_DIR/.."

version=${1:-}
if [[ -z $version ]]; then
  echo "USAGE: $0 version" >&2
  exit 1
fi

if [[ "$(git symbolic-ref --short HEAD)" != "main" ]]; then
  echo "must be on main branch" >&2
  exit 1
fi

# ensure we are up-to-date
uncommitted_changes=$(git diff --compact-summary)
if [[ -n $uncommitted_changes ]]; then
  echo -e "There are uncommitted changes, exiting:\n${uncommitted_changes}" >&2
  exit 1
fi
git pull git@github.com:nix-community/nixos-anywhere main
unpushed_commits=$(git log --format=oneline origin/main..main)
if [[ $unpushed_commits != "" ]]; then
  echo -e "\nThere are unpushed changes, exiting:\n$unpushed_commits" >&2
  exit 1
fi
sed -i -e "s!version = \".*\";!version = \"${version}\";!" src/default.nix
git add src/default.nix
nix-shell -p nix-fast-build --command "nix-fast-build --eval-workers 2"
git commit -m "bump version ${version}"
git tag "${version}"

echo "now run 'git push --tags origin main'"