local event=require("event")

local function components_changed(ename,address,type)
local tty=require("tty")
local window=tty.window
if not window then
return
end

if ename=="component_available"or ename=="component_unavailable"then
type=address
end

if ename=="component_removed"or ename=="component_unavailable"then

if type=="gpu"and window.gpu.address==address then
window.gpu=nil
window.keyboard=nil
elseif type=="keyboard"then




window.keyboard=nil
end
if(type=="screen"or type=="gpu")and not tty.isAvailable()then
event.push("term_unavailable")
end
elseif(ename=="component_added"or ename=="component_available")and type=="keyboard"then








window.keyboard=nil
end
end

event.listen("component_removed",components_changed)
event.listen("component_added",components_changed)
event.listen("component_available",components_changed)
event.listen("component_unavailable",components_changed)