def create_workspace(monitor)
  monitor[:workspaces] << Workspace.new($monitors.key(monitor))
  monitor[:selected_workspace] = monitor[:workspaces].length - 1
end

def delete_workspace(n, monitor)
  return if monitor[:workspaces].length <= 2
  monitor[:workspaces][n].windows.each { |w| monitor[:workspaces][(n - 1) % monitor[:workspaces].length].drop 0, w }
  monitor[:workspaces].delete_at n
  if monitor[:selected_workspace] >= n
    monitor[:selected_workspace] -= 1
  end
end

def select_workspace(n, monitor)
  if n >= monitor[:workspaces].length
    select_workspace monitor[:workspaces].length - 1, monitor
  elsif n < 0
    select_workspace 1, monitor
  end
  monitor[:workspaces].each { |w| w.hide if w != monitor[:workspaces][n] }
  monitor[:selected_workspace] = n
  monitor[:workspaces][n].show
  monitor[:workspaces][n].compute_tiled!
end