View difference between Paste ID: Wb3KRA0D and 82tB9VPi

 -- LemonOS: Pocket Shell for Lemonphone
 -- by ChatGPT (GPT-5)
 -- Features: Persistent settings, live clock, signal bars, auto-netchat install, firmware info
 
 local CONFIG_PATH = "/lemonos.cfg"
 local NETCHAT_PATH = "/netchat"
 local STARTUP_PATH = "/startup.lua"
 
 -- Firmware info
 local firmware = {
     device = "Lemonphone Pocket Computer",
     version = "LemonOS v1.0.0",
 }
 
 local config = {
     username = "User",
     accentColor = colors.yellow,
     bgColor = colors.black,
     rednetSide = "back",
 }
 
 -- === CONFIG LOAD/SAVE ===
 local function saveConfig()
     local file = fs.open(CONFIG_PATH, "w")
     if file then
         file.write(textutils.serialize(config))
         file.close()
     end
 end
 
 local function loadConfig()
     if fs.exists(CONFIG_PATH) then
         local file = fs.open(CONFIG_PATH, "r")
         if file then
             local data = file.readAll()
             file.close()
             local ok, tbl = pcall(textutils.unserialize, data)
             if ok and type(tbl) == "table" then
                 for k, v in pairs(tbl) do
                     config[k] = v
                 end
             end
         end
     end
 end
 loadConfig()
 
 -- === AUTO DOWNLOAD NETCHAT ===
 if not fs.exists(NETCHAT_PATH) then
     print("Downloading netchat...")
     if http then
         local success, response = pcall(http.get, "https://pastebin.com/raw/GwmGxjwy")
         if success and response then
             local content = response.readAll()
             response.close()
             local file = fs.open(NETCHAT_PATH, "w")
             file.write(content)
             file.close()
             print("netchat installed!")
         else
             print("Failed to download netchat.")
         end
     else
         print("HTTP API not enabled, cannot download netchat.")
     end
     -- Set startup to shell.run("firm.lpsw")
     local file = fs.open(STARTUP_PATH, "w")
     file.write('shell.run("firm.lpsw")')
     file.close()
 end
 
 -- === INITIALIZE REDNET ===
 if peripheral.find("modem") then
     rednet.open(config.rednetSide)
 else
     rednet.close(config.rednetSide)
 end
 
 -- === UTILITIES ===
 local function centerText(y, text, color)
     local w = term.getSize()
     local x = math.floor((w - #text) / 2)
     term.setCursorPos(x, y)
     if color then term.setTextColor(color) end
     term.write(text)
     term.setTextColor(colors.white)
 end
 
 local function getSignalStrength()
     if not rednet.isOpen(config.rednetSide) then return 0 end
     local peers = { rednet.lookup("lemonphone_ping") }
     if #peers == 0 then
         return 1
     elseif #peers < 3 then
         return 2
     else
         return 3
     end
 end
 
 local function drawSignalBars(strength)
     local barChar = "|"
     local maxBars = 3
     for i = 1, maxBars do
         if i <= strength then
             term.setTextColor(colors.lime)
         else
             term.setTextColor(colors.gray)
         end
         term.write(barChar)
     end
     term.setTextColor(colors.white)
 end
 
 local function drawTopBar()
     local w = term.getSize()
     term.setCursorPos(1, 1)
     term.setBackgroundColor(config.accentColor)
     term.clearLine()
 
     -- Left: signal strength
     term.setCursorPos(2, 1)
     if rednet.isOpen(config.rednetSide) then
         drawSignalBars(getSignalStrength())
         term.write(" Net")
     else
         term.setTextColor(colors.red)
         term.write("X NoNet")
         term.setTextColor(colors.white)
     end
 
     -- Right: time and date
     local timeStr = textutils.formatTime(os.time(), true)
     local dateStr = os.date("%b %d")
     local clock = timeStr .. " | " .. dateStr
     term.setCursorPos(w - #clock - 1, 1)
     term.setTextColor(colors.white)
     term.write(clock)
 end
 
 local function drawMenu(selected)
     local apps = {
         {name = "Messages", cmd = "netchat join"},
         {name = "Files", cmd = "shell"},
         {name = "Settings", cmd = "settings"},
         {name = "About Lemonphone", cmd = "about"},
         {name = "Reboot", cmd = "reboot"}
     }
 
     local _, h = term.getSize()
     local startY = 4
     term.setTextColor(colors.white)
     for i, app in ipairs(apps) do
         term.setCursorPos(4, startY + i - 1)
         if i == selected then
             term.setBackgroundColor(colors.gray)
             term.setTextColor(colors.black)
         else
             term.setBackgroundColor(config.bgColor)
             term.setTextColor(colors.white)
         end
         term.clearLine()
         term.setCursorPos(4, startY + i - 1)
         term.write(app.name)
     end
 
     term.setBackgroundColor(config.bgColor)
     return apps
 end
 
 -- === SETTINGS MENU ===
 local function openSettings()
     while true do
         term.setBackgroundColor(config.bgColor)
         term.clear()
         centerText(3, "Settings", config.accentColor)
         term.setCursorPos(2, 5)
         term.write("1. Change Username")
         term.setCursorPos(2, 6)
         term.write("2. Change Accent Color")
         term.setCursorPos(2, 7)
         term.write("3. Back")
 
         local _, key = os.pullEvent("key")
         if key == keys.one then
             term.setCursorPos(2, 9)
             term.clearLine()
             term.write("Enter new username: ")
             config.username = read()
             saveConfig()
         elseif key == keys.two then
             term.setCursorPos(2, 9)
             term.clearLine()
             term.write("Color name (e.g. yellow): ")
             local colorName = read()
             if colors[colorName] then
                 config.accentColor = colors[colorName]
                 saveConfig()
             else
                 term.setCursorPos(2, 10)
                 term.write("Invalid color.")
                 sleep(1)
             end
         elseif key == keys.three then
             return
         end
     end
 end
 
 -- === ABOUT LEMONPHONE ===
 local function aboutLemonphone()
     term.setBackgroundColor(config.bgColor)
     term.clear()
     centerText(3, "About Lemonphone", config.accentColor)
     term.setCursorPos(2, 5)
     term.write("Device: " .. firmware.device)
     term.setCursorPos(2, 6)
     term.write("Firmware: " .. firmware.version)
     term.setCursorPos(2, 8)
     term.write("Press any key to return...")
     os.pullEvent("key")
 end
 
 -- === MAIN LOOP ===
-local selected = 1
+-- Pre-draw everything once
 term.setBackgroundColor(config.bgColor)
 term.clear()
 drawTopBar()
 centerText(3, config.username .. "'s Lemonphone", config.accentColor)
 local apps = drawMenu(selected)
 
-    drawTopBar()
+
-    centerText(3, config.username .. "'s Lemonphone", config.accentColor)
+
-    local apps = drawMenu(selected)
+
 while true do
     local event, key = os.pullEvent()
 
     if event == "key" then
         local oldSelected = selected
         if key == keys.up then
             selected = math.max(1, selected - 1)
         elseif key == keys.down then
             selected = math.min(#apps, selected + 1)
         elseif key == keys.enter then
             local chosen = apps[selected]
             if chosen.name == "Settings" then
                 openSettings()
             elseif chosen.name == "About Lemonphone" then
-                term.setBackgroundColor(config.bgColor)
+
-                term.clear()
+
-                term.setCursorPos(1, 1)
+
                 -- Redraw screen after returning from shell
                 drawTopBar()
                 centerText(3, config.username .. "'s Lemonphone", config.accentColor)
                 drawMenu(selected)
             end
         end
 
         -- Only redraw selection highlight if it changed
         if oldSelected ~= selected then
             drawMenu(selected)
         end
 
     elseif event == "timer" then
         -- Only redraw top bar (time + signal)
         drawTopBar()
         timer = os.startTimer(refreshRate)
     end
 end