release

#!/usr/bin/env bash
# release - tag, build, create GitHub release, and print Homebrew tap info
#
# Usage:
#   ./release patch     (0.1.0 → 0.1.1)
#   ./release minor     (0.1.0 → 0.2.0)
#   ./release major     (0.1.0 → 1.0.0)
#   ./release 1.2.3     (explicit version)

set -euo pipefail

REPO="grega/versions"
BINARY_NAME="vrs"
CLI_DIR="$(cd "$(dirname "$0")" && pwd)"

# ── Read current version from latest git tag ────────────────────────────────

current=$(git tag -l 'v*' | sed 's/^v//' | sort -V | tail -1)
current="${current:-0.0.0}"

# ── Resolve new version ─────────────────────────────────────────────────────

if [[ -z "${1:-}" ]]; then
  echo "Usage: ./release <version|patch|minor|major>" >&2
  echo "Current version: $current" >&2
  exit 1
fi

IFS='.' read -r major minor patch <<< "$current"

case "$1" in
  patch) new="$major.$minor.$((patch + 1))" ;;
  minor) new="$major.$((minor + 1)).0" ;;
  major) new="$((major + 1)).0.0" ;;
  *)     new="$1" ;;
esac

tag="v$new"

# ── Safety checks ───────────────────────────────────────────────────────────

if [[ "$new" == "$current" ]]; then
  echo "Error: version is already $current" >&2
  exit 1
fi

if git tag -l "$tag" | grep -q .; then
  echo "Error: tag $tag already exists" >&2
  exit 1
fi

if [[ -n "$(git status --porcelain)" ]]; then
  echo "Error: working tree is not clean — commit or stash first" >&2
  exit 1
fi

echo "Releasing: $current → $new ($tag)"

# ── Build all targets ──────────────────────────────────────────────────────

TARGETS=(
  "darwin  arm64"
  "darwin  amd64"
  "linux   arm64"
  "linux   amd64"
)

assets=()

for target in "${TARGETS[@]}"; do
  read -r os arch <<< "$target"
  echo "Building $os/$arch..."
  outname="$BINARY_NAME-$tag-$os-$arch"
  CGO_ENABLED=0 GOOS="$os" GOARCH="$arch" \
    go build -C "$CLI_DIR" -ldflags "-s -w -X main.version=$new" -o "$BINARY_NAME" .
  tar -czf "/tmp/$outname.tar.gz" -C "$CLI_DIR" "$BINARY_NAME"
  rm "$CLI_DIR/$BINARY_NAME"
  assets+=("/tmp/$outname.tar.gz")
done

# ── Tag and push ────────────────────────────────────────────────────────────

git tag "$tag"
git push origin HEAD --tags

# ── Create GitHub release with assets ───────────────────────────────────────

gh release create "$tag" "${assets[@]}" \
  --repo "$REPO" \
  --title "$tag" \
  --generate-notes

# ── Print Homebrew tap formula snippet ──────────────────────────────────────

sha_for() { shasum -a 256 "$1" | awk '{print $1}'; }
url_for() { echo "https://github.com/$REPO/releases/download/$tag/$(basename "$1")"; }

echo ""
echo "Done! Update homebrew-tap Formula/vrs.rb:"
echo ""
echo "  version \"$new\""
echo ""
echo "  on_macos do"
echo "    if Hardware::CPU.arm?"
echo "      url \"$(url_for "${assets[0]}")\""
echo "      sha256 \"$(sha_for "${assets[0]}")\""
echo "    else"
echo "      url \"$(url_for "${assets[1]}")\""
echo "      sha256 \"$(sha_for "${assets[1]}")\""
echo "    end"
echo "  end"
echo ""
echo "  on_linux do"
echo "    if Hardware::CPU.arm?"
echo "      url \"$(url_for "${assets[2]}")\""
echo "      sha256 \"$(sha_for "${assets[2]}")\""
echo "    else"
echo "      url \"$(url_for "${assets[3]}")\""
echo "      sha256 \"$(sha_for "${assets[3]}")\""
echo "    end"
echo "  end"

rm -f "${assets[@]}"