Question

I am having a lua function to reading and writing a txt file, I need every time lua write in at a new line instead of replacing the previous write in. How do I do that? Do I need to read in and get the lines 1st every time before I write in?

Here is my code:

local function FileOutput(name)
    local f = io.open(name, "w+")
    local meta = {
        __call = function(t, str) f:write(str .. '\n') end,
        __gc = function() f:close() end
    }
    return setmetatable({}, meta)
end

function writeRec()
LOG("writing")
local testfile = FileOutput(getScriptDirectory()..'/textOutput.txt') 
testfile('oh yes!')
testfile = nil
end

Answer 1

Have you tried a+ instead of w+?

http://www.lua.org/manual/5.1/manual.html#pdf-io.open