splits the given beatmap by combo, returns multiple txt files of hitobjects. requires Lua BitOP

tag4solo.lua

--[[ LICENSE

The MIT License (MIT)

Copyright (c) 2016 PC

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.


HOW TO USE:
  • setup lua and install BitOP (find some tutorial online)
  • run this file in a lua session and input the beatmap path and the number of
    difficulties (players in tag coop) to split
  • open the map in osu!, go to File > Create a new Difficulty...
  • enter a name for your diff (e.g "player 1") and click OK, followed by clicking Yes
  • go to File > Open .osu in Notepad
  • under the [HitObjects] section, paste the contents of the corresponding txt file 
    output by the script
  • repeat until done!

--]]

require "bit"
band = bit.band


content = {}
objects = {}
combos = {}
fileName = ""
players = 4


-- Values for writing file
objectStart = 0
objectEnd = 0


-- Constants
CIRCLE = 1
SLIDER = 2
NEW_COMBO = 4
SPINNER = 8


-- Imports the .osu content
function importFile(name)
    local file = io.open(name, "r")

    for line in file:lines() do
        table.insert(content, line)
    end

    file:close()
end


-- Returns subgroup string data in a table
function getData(group)
    local data = {}
    local start = false

    for i=1, #content do
        if content[i-1] == "["..group.."]" then
            start = true
            objectStart = i+1
        end
        if start then
            if (content[i] == "") or (content[i]:sub(1,1) == "[") then
                objectEnd = i
                break
            end
            table.insert(data, content[i])
        end
    end

   return data
end


-- Gathers individual information on hitobjects
function getHitObjects()
    local data = getData("HitObjects")

    -- Capture hitobject info from each line
    for i=1,#data do
        local values = {}

        for v in data[i]:gmatch("([^,]+),?") do
            table.insert(values, v)
        end

        -- Assign values to objects
        local o = {
            x = tonumber(values[1]),
            y = tonumber(values[2]),
            time = tonumber(values[3]),
            object = tonumber(values[4]),
            hitSound = tonumber(values[5])
        }

        if band(o.object, CIRCLE) == CIRCLE then
            o.addition = values[6]
        elseif band(o.object, SLIDER) == SLIDER then
            local sliderInfo = values[6]
            for i=7,#values-1 do
                sliderInfo = sliderInfo..","..values[i]
            end

            o.slider = sliderInfo
            o.addition = values[#values]
        -- Spinner
        elseif band(o.object, SPINNER) == SPINNER then
            o.endTime = tonumber(values[6])
            o.addition = values[7]
        end

        table.insert(objects, o)
    end
end


-- Returns true if new combo
function isNewCombo(i)
    if band(objects[i].object, NEW_COMBO) == NEW_COMBO then
        return true
    end

    return false
end


-- Collect combo starting points
function getCombos()
    for i=1,#objects do
        if isNewCombo(i) then
            table.insert(combos, i)
        end
    end
end


-- Splits combos from the 1th, 2nd, 3rd, or 4th combo and returns hitobject information of these combos
function splitCombos(offset)
    local newObjects = {}
    local count = players-(offset-1) -- Starts counting from respective combo

    for i=1,#combos do
        -- Include spinners
        if band(objects[combos[i]].object, SPINNER) == SPINNER then
            table.insert(newObjects, objects[combos[i]])
        else
            if count % players == 0 then
                local endCombo = 0
                if combos[i+1] then
                    endCombo = combos[i+1]-1
                else
                    endCombo = #objects
                end
                for j=combos[i], endCombo do
                    table.insert(newObjects, objects[j])
                end
            end
            count = count + 1
        end
    end

    return newObjects
end


function objectToString(o)
    local s = string.format("%d,%d,%d,%d,%d",
    o.x,
    o.y,
    o.time,
    o.object,
    o.hitSound
    )

    if band(o.object, SLIDER) == SLIDER then
        s = s..","..o.slider
    elseif band(o.object, SPINNER) == SPINNER then
        s = s..","..o.endTime
    end

    if o.addition then
        s = s..","..o.addition
    end

    return s
end


-- Currently: writes hitobject data to file
function writeFile(data, name)
    local file = io.open(name, "w")

    for i=1,#data do
        file:write(objectToString(data[i]).."\n")
    end

    file:close()
end


--[[ Program Start ]]--


io.write("Please input file path: ")
fileName = io.read()
io.write("Players included: ")
players = tonumber(io.read())


importFile(fileName)
getHitObjects()
getCombos()


for player=1,players do
    local combo = splitCombos(player)
    writeFile(combo, "hitobjects_"..player..".txt")
end