Rift: remove discovery data from xml data files

--[[
Usage:
1. unpack discoveries archive, save script as .lua file in the same folder
2. lua <script_file_name.lua> <xml_file_name.lua>
--]]

local function trim(s)
  -- from PiL2 20.4
  return (s:gsub("^%s*(.-)%s*$", "%1"))
end

local ignoredOpen = {
    ["<FirstCompletedBy>"] = true,
    ["<FirstLootedBy>"] = true,
    ["<FirstKilledBy>"] = true,
    ["<FirstLearnedBy>"] = true
}
local ignoredClose = {
    ["</FirstCompletedBy>"] = true,
    ["</FirstLootedBy>"] = true,
    ["</FirstKilledBy>"] = true,
    ["</FirstLearnedBy>"] = true
}

local filename = arg[1]
local sourceFile = io.open(filename, "r")
local targetFile = io.open("_nd_"..filename, "w")

local skip = false
local discData = false
local ignore = true

local trimmed
while true do

    local sourceLine = sourceFile:read("*l")

    if sourceLine == nil then break end

    trimmed = trim(sourceLine)
    ignore = false

    if ignoredOpen[trimmed] then
        discData = true
        ignore = true
    end

    if ignoredClose[trimmed] then
        discData = false
        ignore = true
    end

    if (not discData) and (not ignore) then
        targetFile:write(sourceLine)
        targetFile:write("\n")
    end

end

sourceFile:close()
targetFile:close()