api/path

local function merge(tbl1, tbl2)
  for i,v in ipairs(tbl2) do table.insert(tbl1, v) end
  return tbl1
end

function getFiles(root, recursive)
  local function helper(path)
    local retVal = {}
    local files = fs.list(path)
    for _,file in ipairs(files) do
      file = path.."/"..file
      local isDir = fs.isDir(file)
      if isDir and recursive then
        merge(retVal, helper(file))
      elseif not isDir then
        file = string.gsub(file,root.."/","")
        table.insert(retVal, file)
      end
    end
    return retVal
  end
  return helper(root)
end