Orbital Startup

if not term.isColor() then
 error("LEFI cannot run on non-advanced computers.")
end

-- Declare extended Lua attributes

rawset(_G, "__declare", function(g, v)
 return rawset(_G, g, v)
end)

__declare("__declare_api", function(a, g, v)
 return rawset(_G[a], g, v)
end)

__declare("__try", function(f, e)
local r = {pcall(f)}
if table.remove(r, 1) == true then
 return unpack(r)
else
 if e ~= nil then
  e(unpack(r))
 else
  return __kstop(0x0000FFFF, unpack(r))
 end
end
end)

__declare("__kstruct", function(t)
 if t == _G then
  return setmetatable({}, {
   __index = t,
   __newindex = function(table, key, value)
    __kstop(0x00000004, table, key, value)
   end,
   __metatable = {}
  })
 else
  return setmetatable({}, {
   __index = t,
   __newindex = function(table, key, value)
    __kstop(0x00000005, table, key, value)
   end,
   __metatable = {}
  })
 end
end)

-- declare library persistence loader
__declare("persist", function(n, c)
 local h = fs.open("/tmp/"..n, "w")
 h.writeLine(c)
 h.close()
 os.loadAPI("/tmp/"..n)
 fs.delete("/tmp/"..n)
end)

__declare("drawBootManager", function(opt)
    term.setBackgroundColor(colors.black)
    term.clear()
    term.setCursorPos(1,1)
    if not opt then
        boot_printColoredTextLine(2, "             Orbital Boot Manager v1.0             ", colors.lightGray, colors.black)
        boot_printColoredTextLine(18, " F2=ESI Setup                        F10=Boot Menu ", colors.lightGray, colors.black)
    else
        boot_printColoredTextLine(2, "             Orbital Boot Manager v2.1             ", colors.red, colors.black)
        boot_printColoredTextLine(18, " CTRL+R=Reboot                                     ", colors.red, colors.black)
    end
end)

local sr = shell.run

if not fs.isDir("/boot") or not loadfile("/boot/esi/esiboot.b") then
    drawBootManager(true)
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.red)
    term.setCursorPos(2,4)
    print("The Orbital Boot Manager was unable to boot the")
    term.setCursorPos(2,5)
    print("operating system.")
    term.setCursorPos(2,7)
    print("Status:")
    term.setCursorPos(2,8)
    print("ESI_BINARIES_INVALID (0x00000002)")
    term.setCursorPos(2,10)
    print("Information:")
    term.setCursorPos(2,11)
    print("One or more ESI files are missing.")
    term.setCursorPos(2,12)
    print("Please re-install the operating system.")
    while true do
        sleep(1)
    end
end

sr("/boot/esi/esiboot.b")