Welcome Screen V2

-- Utility functions
local function lineBreak()
    local width = term.getSize()
    print(string.rep("-", width))
end

local function clearScreen()
    term.clear()
    term.setCursorPos(1, 1)
end

-- Menu entries: {Display Name, Program Name}
local menuItems = {
    {"Bastion", "Bastion"},
    {"Automatic Bastion", "RBastion"},
    {"GPS", "GPS"},
    {"Artillery Controller", "ArtilleryControl"},
    {"Stargate Controller", "psg"},
    {"To-Do List", "todo"},
    {"Update", "Update"},
    {"Exit", nil} -- nil indicates exit
}

local function drawMenu()
    clearScreen()
    print("Welcome to Monopoly OS by Monopoly Co.")
    lineBreak()
    print("Current Time: " .. textutils.formatTime(os.time(), true))
    lineBreak()
    print("Select a program to run:")
    for i, item in ipairs(menuItems) do
        print(i .. ". " .. item[1])
    end
    lineBreak()
end

local function getClickedItem(y)
    -- Menu starts on line 6
    local index = y - 6
    if index >= 1 and index <= #menuItems then
        return index
    end
    return nil
end

-- Main execution
drawMenu()

while true do
    local event, button, x, y = os.pullEvent()

    if event == "mouse_click" then
        local choice = getClickedItem(y)
        if choice then
            local entry = menuItems[choice]
            if entry[2] == nil then
                break -- Exit
            else
                shell.run(entry[2])
                drawMenu()
            end
        end
    elseif event == "char" then
        local num = tonumber(button)
        if num and menuItems[num] then
            local entry = menuItems[num]
            if entry[2] == nil then
                break
            else
                shell.run(entry[2])
                drawMenu()
            end
        end
    end
end