Discord.js Minesweeper

A Minesweeper generator library for Discord. See it in action here!

Table of Contents

• Advantages
• Usage
  • Options
  • Returned Data
• Methods
• Examples
  • Discord.js
  • Commando
• License

Advantages

• Runs pretty smooth.
• It's very easy to use.
• Supports multiple return formats.
• Highly customizable.
• No dependencies.
• Written in TypeScript.

Usage

First, you need to add the library to your project (duh!):

npm install discord.js-minesweeper
# or
yarn add discord.js-minesweeper

Import it and use it as you wish!

const Minesweeper = require('discord.js-minesweeper');

// ...

const minesweeper = new Minesweeper();
minesweeper.start();
// Returns a Discord-interpretable string with a 9x9 matrix of spoilers and emojis, 10 of which are mines.

const minesweeper = new Minesweeper({
  rows: 12,
  columns: 16,
  mines: 20,
  emote: 'tada',
  returnType: 'code',
});
minesweeper.start();
// Returns a Discord-interpretable code block with a 12x16 matrix of spoilers and emojis, 20 of which are mines that will appear as the :tada: emote.

Options

• rows (number) - The number of rows in the mine field. Defaults to 9.
• columns (number) - The number of columns in the mine field. Defaults to 9.
• mines (number) - The number of mines in the mine field. Defaults to 10.
• emote (string) - The emote used as a mine (without colons). Defaults to "boom".
• spaces (boolean) - Specifies whether or not the emojis should be surrounded by spaces. Defaults to true.
• zeroFirstCell (boolean) - Whether or not the first cell revealed should always be a zero (and automatically reveal any surrounding safe cells). Does nothing if revealFirstCell is false. Defaults to true.
• revealFirstCell (boolean) - Whether or not the first cell should be revealed (like in regular Minesweeper). Defaults to FALSE.
• returnType (string) - The type of the returned data.
• rng (() => number) - The random number generator function used for placing mines. Must generate a number between 0 and 1. Defaults to Math.random.

Returned Data

Based on the specified returnType, the returned data can vary.

• 'emoji' - default value, returns a Discord message format with spoilers and emojis
• 'code' - same as 'emoji', but in a code block (i.e. for copying)
• 'matrix' - the matrix array itself.

If a mine field is not possible with the provided data (i.e. too many mines), it will return null.

Methods

start()

Generates a minesweeper mine field and returns it.

Returns

• string - A Discord-interpretable message.
• string[][] - A matrix of the generated Minesweeper field.
• null - If it's not possible to generate a Minesweeper field using the provided data.

spoilerize(str)

Turns a text into a Discord spoiler.

Params

• string str - The string to spoilerize.

Returns

• string - A Discord-interpretable spoiler containing the provided text.

getNumberOfMines(x, y)

Gets the number of mines in a particular (x, y) coordinate of the matrix.

Params

• number x - The x coordinate (row).
• number y - The y coordinate (column).

Returns

• string - The number of mines surrounding the provided cell in the format of a spoilerized emoji.

getTextRepresentation()

Returns the Discord message equivalent of the mine field.

Returns

• string - A Discord-interpretable message.

populate()

Populates the matrix with mine counts.

revealFirst()

Reveal a random cell.

Returns

• SafeCell - the x and y coordinates of the revealed cell.

---

Note: the methods generateEmptyMatrix() and plantMines() are for internal use and should not be used outside the module. Using any of these could alter the generated matrix in unexpected ways. Don't use them in your app unless you know what you're doing.

Examples

Discord.js

const Discord = require('discord.js');
const Minesweeper = require('discord.js-minesweeper');

const bot = new Discord.Client();

bot.on('message', function (message) {
  const content = message.content.split(' ');
  const args = content.slice(1);

  if (content[0] === '.minesweeper') {
    const rows = parseInt(args[0]);
    const columns = parseInt(args[1]);
    const mines = parseInt(args[2]);

    if (!rows) {
      return message.channel.send(':warning: Please provide the number of rows.');
    }

    if (!columns) {
      return message.channel.send(':warning: Please provide the number of columns.');
    }

    if (!mines) {
      return message.channel.send(':warning: Please provide the number of mines.');
    }

    const minesweeper = new Minesweeper({ rows, columns, mines });
    const matrix = minesweeper.start();

    return matrix
      ? message.channel.send(matrix)
      : message.channel.send(':warning: You have provided invalid data.');
  }
});

bot.login(TOKEN);

Commando

const { Command } = require('discord.js-commando');
const Minesweeper = require('discord.js-minesweeper');

class MinesweeperCommand extends Command {
  constructor(client) {
    super(client, {
      // ...
      args: [
        {
          key: 'rows',
          prompt: 'How many rows?',
          type: 'integer',
          min: 4,
          max: 20
        },
        {
          key: 'columns',
          prompt: 'How many columns?',
          type: 'integer',
          min: 4,
          max: 20
        },
        {
          key: 'mines',
          prompt: 'How many mines?',
          type: 'integer',
          min: 1
        }
      ]
    });
  }

  async run(message, { rows, columns, mines }) {
    const minesweeper = new Minesweeper({ rows, columns, mines });
    const matrix = minesweeper.start();

    return matrix
      ? message.say(matrix)
      : message.say(':warning: The provided data is invalid.');
  }
};

module.exports = MinesweeperCommand;

Custom RNG (seeded Minesweeper)

You can now pass in any function that returns a number between 0 and 1 as the random number generator function. With the following basic example, you can create a seeded Minesweeper:

const seedrandom = require('seedrandom');

const myrng = seedrandom('myseed');

const minesweeper = new Minesweeper({
  rng: myrng
});

This will always generate the same Minesweeper game for the seed myseed.

License

Licensed under MIT. Check LICENSE for more information.