bash

local cobalt = dofile( "cobalt" )
cobalt.ui = dofile( "cobalt-ui/init.lua" )
os.loadAPI("/var/var")
os.loadAPI("/lib/login")
os.loadAPI("/lib/hash")
settings.load("/etc/.users")
local Panel = cobalt.ui.new({ w = "50%", marginleft="25%", h = "50%", margintop = "25%" })
local Text = Panel:add("text", {text=var.hostname.." login", wrap="center"})
Text.y=4
local Username = Panel:add( "input", {
    w = "80%",
    marginleft="10%",
    y = 6,
    backPassiveColour = colours.lightGrey,
    forePassiveColour = colours.grey,
    backActiveColour = colours.lightGrey,
    placeholder = "Username",
    placeholderColour = colours.grey,
})
local Password = Panel:add( "input", {
    w = "80%",
    marginleft="10%",
    y = 8,
    backPassiveColour = colours.lightGrey,
    forePassiveColour = colours.grey,
    backActiveColour = colours.lightGrey,
    placeholder = "Password",
    placeholderColour = colours.grey,
    mask = "*",
})
local Button = Panel:add("button", {wrap="center",y=10})
Button.text = "Log In"
Button.backColour = colors.blue
Button.onclick = function()
    settings.load("/etc/.users")
    local passwd = settings.get(Username.text)
    local pwd = hash.digest(Password.text)
    if textutils.serialize(pwd) == textutils.serialize(passwd) then
        auth({true, Username.text})
    else
        Text.text = "Password incorrect!"
    end
end

function cobalt.draw()
  cobalt.ui.draw()
end

function cobalt.update( dt )
    cobalt.ui.update( dt )
end

function cobalt.mousepressed( x, y, button )
    cobalt.ui.mousepressed( x, y, button )
end

function cobalt.mousereleased( x, y, button )
    cobalt.ui.mousereleased( x, y, button )
end

function cobalt.keypressed( keycode, key )
    cobalt.ui.keypressed( keycode, key )
end

function cobalt.keyreleased( keycode, key )
    cobalt.ui.keyreleased( keycode, key )
end

function cobalt.textinput( t )
    cobalt.ui.textinput( t )
end

function getCurrentDir(username)
    local dir = shell.dir()
    if dir == "home/" .. username then
        return "~/"
    else
        return "/" .. dir
    end
end

function runShell(username)
    while true do
        term.write(username .. "@" .. var.hostname .. "[" .. getCurrentDir(username) .. "]: ")
        local cmd = io.read()
        local cursorX, cursorY = term.getCursorPos()
        term.setCursorPos(1, cursorY)
        if cmd == "exit" then
            break
        elseif cmd == "cd ~ " then
            shell.run("cd", "/home/" .. username)
        else
            shell.run(cmd)
        end
    end
end
function auth(authCorrect)
if authCorrect[1] == true then
    term.clear()
    term.setCursorPos(1,1)
    print("Welcome to Zinc Linux, ".. authCorrect[2])
    shell.run("cd", "/home/" .. authCorrect[2])
    runShell(authCorrect[2])
end
end
cobalt.initLoop()