I have a file structured like this: we can call it input.tex

begin{document}
import{./}{Capitolo1.tex}
import{./}{Capitolo2.tex}
end{document}

Using this function I can perform a serger operation, replacing the import command with the content of the desired file (Chapter 1, Chapter 2)

function search_for_import(tex)
    print(tex)
    local temp= tex..".mirror"
    local tbl = {}
    for j = 1, #rows_from(tex) do
        if string.sub(rows[j],1,7) == "\import" then
            table.insert(tbl,{
                [1] = j,
                [2] = string.sub(rows[j],13,-2),
            })
            print(string.sub(rows[j],13,-2))
            search_for_import(string.sub(rows[j],13,-2))
        end
    end
    if #tbl > 0 then
        temp = tex..".mirror"
        io.output(temp)
        local line
        row = rows_from(tex)
        print(#row)
        for i = 1, #row do
            line = row[i]
            for key, value in pairs(tbl) do
                
                if i == value[1] then
                    print(value[2])
                    line = row[i+1]
                    for j = 1, #rows_from(value[2]) do
                        io.write(rows_from(value[2])[j], "n")
                    end
                end
            end
            io.write(line, "n")
        end
        io.close()
    end
    os.execute("move "..temp.." "..tex)
end

This function works fine. But what if the imported file itself had an import command? My attempt is to use the recursive function

for j = 1, #rows_from(tex) do
    if string.sub(rows[j],1,7) == "\import" then
        table.insert(tbl,{
            [1] = j,
            [2] = string.sub(rows[j],13,-2),
        })
        print(string.sub(rows[j],13,-2))
        search_for_import(string.sub(rows[j],13,-2)) --this
    end
end

But this end with an infinite loop.

Ant ideas?