local kernel = _G.kernel
local os     = _G.os
local shell  = _ENV.shell

local launcherTab = kernel.getCurrent()

kernel.hook('kernel_focus', function(_, eventData)
  local focusTab = eventData and eventData[1]
  if focusTab == launcherTab.uid then
    local previousTab = eventData[2]
    local nextTab = launcherTab
    if not previousTab then
      for _, v in pairs(kernel.routines) do
        if not v.hidden and v.uid > nextTab.uid then
          nextTab = v
        end
      end
    end
    if nextTab == launcherTab then
      shell.switchTab(shell.openTab('sys/apps/shell.lua'))
    else
      shell.switchTab(nextTab.uid)
    end
  end
end)

while os.pullEventRaw() do end