class RuboCop::Server::ClientCommand::Exec

def ensure_server!
  if incompatible_version?
    warn 'RuboCop version incompatibility found, RuboCop server restarting...'
    ClientCommand::Stop.new.run
  elsif check_running_server
    return
  end
  ClientCommand::Start.new.run
end

def incompatible_version?
  Cache.version_path.read != Cache.restart_key
end

def run
  ensure_server!
  read_stdin = ARGV.include?('-s') || ARGV.include?('--stdin')
  send_request(
    command: 'exec',
    args: ARGV.dup,
    body: read_stdin ? $stdin.read : ''
  )
  warn stderr unless stderr.empty?
  status
end

def status
  unless Cache.status_path.file?
    raise "RuboCop server: Could not find status file at: #{Cache.status_path}"
  end
  status = Cache.status_path.read
  raise "RuboCop server: '#{status}' is not a valid status!" unless /\A\d+\z/.match?(status)
  status.to_i
end

def stderr
  Cache.stderr_path.read
end