Transparent wrapper for nightly Neovim builds

nvim

#!/usr/bin/env bash
# Transparent Neovim nightly wrapper
# Save as: ~/.local/bin/nvim   (chmod +x)
set -euo pipefail

# -------- config --------
CACHE_DIR="${HOME}/.local/share/neovim-nightly"
STAMP_FILE="${CACHE_DIR}/.last_update"
CURRENT_LINK="${CACHE_DIR}/current"
# ------------------------

detect_asset() {
  local os arch asset
  os="$(uname -s)"
  arch="$(uname -m)"

  case "$os" in
    Linux)
      case "$arch" in
        x86_64|amd64)   asset="nvim-linux64.tar.gz" ;;
        aarch64|arm64)  asset="nvim-linux-arm64.tar.gz" ;;
        *) echo "Unsupported Linux arch: $arch" >&2; exit 1 ;;
      esac
      ;;
    Darwin)
      case "$arch" in
        arm64)          asset="nvim-macos-arm64.tar.gz" ;;
        x86_64)         asset="nvim-macos.tar.gz" ;;
        *) echo "Unsupported macOS arch: $arch" >&2; exit 1 ;;
      esac
      ;;
    *)
      echo "Unsupported OS: $os" >&2
      exit 1
      ;;
  esac

  printf '%s\n' "$asset"
}

needs_update_today() {
  # Update if:
  # - current link/binary missing
  # - stamp missing
  # - stamp date != today (local)
  if [[ ! -L "$CURRENT_LINK" || ! -x "$CURRENT_LINK/bin/nvim" ]]; then
    return 0
  fi
  if [[ ! -f "$STAMP_FILE" ]]; then
    return 0
  fi
  local today
  today="$(date +%F)"
  local stamped
  stamped="$(cat "$STAMP_FILE" 2>/dev/null || true)"
  [[ "$stamped" != "$today" ]]
}

perform_update() {
  mkdir -p "$CACHE_DIR"
  local asset url tmpdir extracted_dir target_dir
  asset="$(detect_asset)"
  url="https://github.com/neovim/neovim/releases/download/nightly/${asset}"
  tmpdir="$(mktemp -d)"
  trap 'rm -rf "$tmpdir"' EXIT

  # Download
  if command -v curl >/dev/null 2>&1; then
    curl -fL --retry 3 --retry-delay 1 -o "${tmpdir}/${asset}" "$url"
  elif command -v wget >/dev/null 2>&1; then
    wget -O "${tmpdir}/${asset}" "$url"
  else
    echo "Need curl or wget to download Neovim." >&2
    exit 1
  fi

  # Extract
  tar -xzf "${tmpdir}/${asset}" -C "$tmpdir"

  # Find extracted nvim-* dir
  extracted_dir="$(find "$tmpdir" -maxdepth 1 -type d -name 'nvim-*' -print -quit)"
  if [[ -z "${extracted_dir:-}" ]]; then
    echo "Failed to locate extracted Neovim directory." >&2
    exit 1
  fi

  # Move into cache under a unique dir, then point 'current' symlink
  target_dir="${CACHE_DIR}/$(basename "$extracted_dir")"
  rm -rf "$target_dir"
  mv "$extracted_dir" "$target_dir"
  ln -sfn "$target_dir" "$CURRENT_LINK"

  # Stamp today
  date +%F > "$STAMP_FILE"
}

main() {
  if needs_update_today; then
    # Try to update; if download fails, continue using existing binary if present
    if ! perform_update 2>/dev/null; then
      echo "Neovim nightly update failed; using existing build if available." >&2
    fi
  fi

  # Final binary path
  local nvim_bin="${CURRENT_LINK}/bin/nvim"
  if [[ ! -x "$nvim_bin" ]]; then
    echo "Neovim binary not found at ${nvim_bin}. Remove ${CACHE_DIR} and retry." >&2
    exit 1
  fi

  # Execute transparently, preserving stdin/stdout and args/pipes
  exec "$nvim_bin" "$@"
}

main "$@"