cutAtlas.lua

-- cutAtlas.lua
-- Chops up Dragon Bones atlas files that target multiple sheets.

require "lfs"

local function getExt(filename)
    local div = filename:find("%.[^%.]*$")
    if not div then return filename end
    return filename:sub(1, div - 1), filename:sub(div + 1):lower()
end

local function checkAtlasDir(dir)
    for entry in lfs.dir(dir) do
        local path = dir .. "/" .. entry
        local attribs = lfs.attributes(path)

        if attribs then
            if entry ~= "." and entry ~= ".." and attribs.mode == "directory" then
                checkAtlasDir(path)
            elseif attribs.mode == "file" and (entry:sub(-6):lower() == ".atlas" or entry:sub(-10):lower() == ".atlas.txt") then
                local output

                for line in io.lines(path) do
                    if line:sub(-4):lower() == ".png" then
                        if output then output:close() end
                        local name, ext = getExt(line)
                        if not lfs.attributes(dir .. "/" .. name .. ".atlas") then output = io.open(dir .. "/" .. name .. ".atlas", "w") end
                        if output then output:write("\n" .. line .. "\n") end
                    else
                        if output then output:write(line .. "\n") end
                    end
                end
            end
        end
    end
end

checkAtlasDir(".")