Messenger

--TODO: Add a read() that specifies the broadcast channel (for privacy), if left empty, use the standard

local MaxX,MaxY = term.getSize()
local msg = ""
local shift = false

term.clear()
term.setCursorPos(1, 1)
print("Choose a name:")
local user = read()

peripheral.find("modem", rednet.open)
term.clear()
while(true) do
    parallel.waitForAny(function()
            local id, message = rednet.receive()
            term.setTextColor(colors.white)
            local cY,cY = term.getCursorPos()
            term.setCursorPos(1, cY)
            print(message)
            term.setCursorPos(1, MaxY)
            write(msg)
            sleep(1)
        end,
        function()
            local event, key, is_held = os.pullEvent("key")
            sKey = keys.getName(key)
            if (sKey == "enter") then
                term.setTextColor(colors.green)
                local cY,cY = term.getCursorPos()
                term.setCursorPos(1, cY)
                print(msg)
                rednet.broadcast(user .. "> " .. msg)
                msg = ""
            elseif (sKey == "backspace") then
                msg = string.sub(msg, 1, string.len(msg)-1)
            elseif (sKey == "space") then
                msg = msg .. " "
            elseif (sKey == "leftShift" or sKey == "rightShift") then
                shift = true
            elseif (key >=48 and key <= 57) then
                sKey = key-48
                msg = msg .. sKey
            elseif (sKey ~= nil) then
                if (shift) then
                    sKey = string.upper(sKey)
                    shift = false
                end
                msg = msg .. sKey
            end
            term.setCursorPos(1, MaxY)
            term.clearLine()
            term.setTextColor(colors.white)
            write(msg)
        end)
end