Tabletop !roll dice roller command for the Nightbot Twitch chatbot. Made for the Oaty Twitch channel: https://www.twitch.tv/Oaty

NightbotDiceRoller_v0-4-0.js

// The !roll or !r command
// Version: 0.4.0
// Contributions by:
//   @patferguson, @JessicaCGlenn
// ==============================

// The first and last line are just for the Nightbot command, they aren't JavaScript

// vvv Copy from BELOW this line vvv

$(user) rolled: $(eval
    var inp = "$(1)";
    function roll(r){for(var a=r.split(/[d+-]/),t=Math.min(a[0].length>0?Number.parseInt(a[0],10):1,1e3),e=Number.parseInt(a[1],10),n=a.length>2?Number.parseInt(a[2],10):0,o=n=-1!==r.indexOf("-")?-n:n,h=[],l=0;l<t;++l){var f=Math.floor(Math.random()*Math.floor(e)+1);o+=f,h.push(f)}var i=`${o}`;return t<30&&t>1&&(i+=` [${h}]`),0!=n&&(i+=` (modified: ${o-n}${n<0?"-":"+"}${Math.abs(n)})`),i}
    roll(inp);
)

// ^^^ To ABOVE this line, paste this into the Command 'Message' field in Nightbot ^^^



// For checking the distribution of dice rolls
// ===========================================

// NOTE - This is just for development, copy the Nightbot command above if you
//   just want the !roll dice roller command

// An easy way to test this out is to run the code in a web browser's dev console

// Run this first:
function roll(inp) {
  var spl = inp.split(/[d+-]/);
  var dCount = Math.min(spl[0].length > 0 ? Number.parseInt(spl[0], 10) : 1, 1000);
  var dSize = Number.parseInt(spl[1], 10);

  // modify the result from the roll
  var mod = spl.length > 2 ? Number.parseInt(spl[2], 10) : 0;
  mod = inp.indexOf('-') !== -1 ? -mod : mod;

  var res = mod;
  var ress = [];
  for (var i=0; i < dCount; ++i) {
      var roll = Math.floor((Math.random() * Math.floor(dSize)) + 1);
      res += roll;
      ress.push(roll);
  }
  var rString = `${res}`;
  if (dCount < 30 && dCount > 1) rString += ` [${ress}]`;
  if (mod != 0) rString += ` (modified: ${res - mod}${mod < 0 ? '-' : '+'}${Math.abs(mod)})`;
  return rString;
}

// Then run this:
var diceSize = 20;
var iterCount = 1000000;
var rollResults = []
for (var fillIter = 1; fillIter <= diceSize; ++fillIter) {
  rollResults[fillIter] = 0;
}
for (var i = 0; i < iterCount; ++i) {
  var rollResult = roll("1d"+diceSize);
  rollResults[Number.parseInt(rollResult)] += 1;
}
for (var logIter = 1; logIter <= diceSize; ++logIter) {
  console.log(logIter + " " + rollResults[logIter] + ",");
}

Hey Pat!

Made some small changes in here in case they're helpful. It appears that for the moment you can't send a pull request through on a gist, so have left them on their own fork for you to peruse and added the working script into my channel so that you can test the results without risk:

https://gist.github.com/JessicaCGlenn/21fd6fa075a177dd1bd4642dd515c1b5

Hope this helps :-D

JG

I finally got around to incorporating your dice roller changes @JessicaCGlenn, huge thanks for your work! I've updated the !roll and !r Nightbot commands over at https://www.twitch.tv/oaty as well, looks like it's all working great :D