WirelessControlReceiver

-- by UNOBTANIUM 4.4.2014

local id = "TEXT"
local state = false
local w,h = term.getSize()

function save()
    local file = fs.open("redstone","w")
        file.writeLine(id)
        file.writeLine(tostring(state))
    file.close()
end

function load()
    if fs.exists("redstone") then
        local file = fs.open("redstone","r")
            id = file.readLine()
            if file.readLine() == "true" then
                state = true
            end
        file.close()
    end
end



function openRednet()
    for _, side in pairs(redstone.getSides()) do
      if peripheral.getType(side) == "modem" then
        rednet.open(side)
      end
    end
end

function setRedstone()
    for _, side in pairs(redstone.getSides()) do
        redstone.setOutput(side, state)
    end
end


function set()
    sleep(0)
    term.setCursorPos(1, 5)
    term.clearLine()
    write("Text: ", 14, 5)
    id = betterRead(20,5)
end

function betterRead(x,y) -- DONE 1
    term.setCursorBlink(true)
    local s = id

    while true do
        term.setCursorPos(x,y)
        term.write( string.rep(' ', w - x + 1) )
        term.setCursorPos(x,y)
        if s:len()+x < w then
            term.write(s)
        else
            term.write(s:sub( s:len() - (w-x-2)))
        end
        local e = { os.pullEvent() }
        if e[1] == "char" then
            s = s .. e[2]
        elseif e[1] == "key" then
            if e[2] == keys.enter then
                break
            elseif e[2] == keys.backspace then
                s = s:sub( 1, s:len() - 1 )
            end
        end
    end

    term.setCursorBlink(false)
    return s
end

function draw()
    term.clear()
    write("Text: " .. id, 14,5)
    write("Current State: " .. tostring(state), 5,6)
    write("Hit a button to change the text!",8,8)
end

function write(text, x, y)
    term.setCursorPos(x,y)
    term.write(tostring(text))
end


function main()
    while true do
        draw()
        openRednet()
        local event = {os.pullEvent()}
        if event[1] == "rednet_message" then
            if event[3] == ("" .. id .. tostring(not state)) then
                state = not state
                setRedstone()
            end
        elseif event[1] == "key" then
            set()
        end
        save()
    end
end


load()
setRedstone()
main()