SignProgram

function peripheral.find(pType)
    pList = {}
    for _,pName in pairs(peripheral.getNames()) do
        if peripheral.getType(pName) == pType then
            table.insert(pList, peripheral.wrap(pName))
        end
    end
    return unpack(pList)
end
local sign = peripheral.find("sign")
local colorSymbol = string.char(194) .. string.char(167)

function saveSign(file_name)
    local file = fs.open(file_name, "w")
    for y=1, 4 do
        file.writeLine( sign.getLine(y) )
    end
    file.close()
end

function pasteSign(file_name)
    local file = fs.open(file_name, "r")
    for y=1, 4 do
        txt[y] = sign.setLine(y, file.readLine() or "")
    end
    file.close()
end

local args = {...}
if args[1] then
    local line = tonumber(args[1])
    if line and args[2] then
        local text = ""
        for i=2, #args, 1 do
            text = text .. args[i]
            if args[i+1] then
                text = text .. " "
            end
        end
        text = text:gsub("&", colorSymbol)
        sign.setLine(line,text)
        return
    end

    if args[1] == "save" then
        saveSign(args[2] or "savedSign")
        return
    end

    if args[1] == "paste" then
        pasteSign(args[2] or "savedSign")
        return
    end
end

print("Usage 1: sign <line> <text>")
print("Usage 2: sign save <filename>")
print("Usage 3: sign paste <filename>")