Snippet: Discord Dice Roll Command

Discord Dice Roll Command

Scott — threesided

Command that can roll a collection of dice, separated by spaces. Can handle multiple dice in a single roll, as well as roll boosts or penalties. For example, to roll 3 d6's and a d20 you can do "!roll 3d6 1d20".

/* Dice roll syntax: !roll [number of dice](d/D)[die to roll](+/-)[stat mod]
Examples:
  !roll 1d20
  !roll 5d10+5 3d6-2 1d20
*/

const lib = require('lib')({token: process.env.STDLIB_SECRET_TOKEN});

if (context.params.event.content.startsWith('!roll')) {
  let rolls = context.params.event.content.split(' ').slice(1);
  
  let rollSum = 0;
  
  let rollResults = rolls.map((roll) => {
    let [count, die, _] = roll.split(/[dD+-]{1}/);
    let mod = roll.match(/([+-]{1})([0-9]{1,})/);
    
    if (count && die) {
      let rolls = [];
      
      for (let i = 0; i < count; i++) {
        rolls.push(1 + Math.floor(Math.random() * die))
      }
      
      let rollTotal = rolls.reduce((acc, _r) => acc + _r, 0) + 
        (mod ? parseInt(mod[2]) * (mod[1] === '-' ? -1 : 1) : 0);
      
      rollSum += rollTotal;
      
      return  `${rollTotal} — (${rolls.join(', ')}${mod ? ', ' + mod[0] : ''})`;
    } else {
      return 'Bad roll!';
    }
  });
  
  await lib.discord.channels['@0.1.1'].messages.create({
    channel_id: `${context.params.event.channel_id}`,
    content: `🎲 Rolled **${rollSum}**\`\`\`${rollResults.join('\n')}\`\`\``,
  });
}