bandolier-website/static/djenterator/command.js

// you may not need all of these but they come up a lot
import fs from "fs";
import assert from "assert";
import logging from '../lib/logging.js';
import glob from "fast-glob";
import path from "path";
import template from "lodash/template.js";

const log = logging.create(import.meta.url);

export const description = "Describe your command here."

// your command uses the npm package commander's options format
export const options = [
  ["--input <string>", "A string option with a default.", "default.json"],
  ["--min <number>", "A number option, no default."],
]

// example of a positional argument, it's the 1st argument to main
export const argument = ["source", "source directory"];

// put required options in the required variable
export const required = [
  ["--output <string>", "Save to file rather than stdout."],
]

// handy function for checking things are good and aborting
const check = (test, fail_message) => {
  if(!test) {
    log.error(fail_message);
    process.exit(1);
  }
}

export const main = async (arg, opts) => {
  // if they give an numeric option this is how you can convert it
  // yes, this is annoying and commander should handle it but oh well
  if(opts.min !== undefined) {
    // commander doesn't do integer conversions sadly
    opts.min = parseInt(opts.min, 10);
    check(!isNaN(opts.min), "--min must be a number");
  }

  // it's easier to debug options with console
  console.log("OPTIONS", opts, "ARG", arg);

  // due to how async/await works it's just easier to manually exit with exit codes
  process.exit(0);
}