delimitador.js

var text = 'Seitan XOXO meh cornhole, before they sold out mustache scenester photo booth.  IPhone selvage Pitchfork aesthetic.  Polaroid post-ironic Thundercats quinoa, roof party PBR mumblecore cred +1 semiotics scenester freegan organic Godard.  Cred Banksy meggings actually, Helvetica kogi gluten-free fap ethical slow-carb flexitarian before they sold out four loko.  Fixie ugh yr single-origin coffee mustache.  Mumblecore cardigan Helvetica mlkshk iPhone.  Biodiesel synth pug Banksy mustache food truck McSweeney\'s, Intelligentsia post-ironic whatever ethnic dreamcatcher.';

var cut = function(text, max, delimiter){
    return text.split(' ').reduce(function(arr, word){
        if(!Array.isArray(arr))
            arr = [new Buffer(arr)];

        if(Buffer.concat([arr[arr.length -1], new Buffer(' ' + word)]).length > max)
            arr.push(new Buffer(word));
        else
            arr[arr.length - 1] = Buffer.concat([arr[arr.length -1], new Buffer(' ' + word)]);

        return arr;
    }).reduce(function(buff, item){
        return Buffer.concat([buff, new Buffer(delimiter), item]);
    });
};


console.log(cut(text, 44, '\n').toString());