oblique-strategies-cli/src/index.ts

import yargs from 'yargs';
import { hideBin } from 'yargs/helpers';
import {
  main,
  MainArgs,
  Presentation,
  PRESENTATION,
} from './app';

void main(
  yargs
    .option('cards', {
      alias: 'c',
      description: "List of source for generating cards. Can have 'default', a pipe-delimited string starting with 'text:' or a URL starting with file:/// or http[s]://",
      coerce: (c?: unknown) => {
        if (typeof c !== 'string') {
          return ['default'];
        }

        const theCards = c.split(';');
        if (theCards.length < 1) {
          return ['default'];
        }

        // dedupe so we don't have to generate some cards more likely than others
        return theCards.filter((card, i, cards) => cards.indexOf(card) === i);
      },
      default: 'default',
    })
    .option('formatted', {
      alias: 'f',
      description: 'Flag when the output should be formatted.',
      coerce: (c?: unknown) => Boolean(c),
      default: false,
    })
    .option('presentation', {
      alias: 'p',
      description: 'Selection of how the card should be presented.',
      choices: PRESENTATION,
      coerce: (c?: unknown): Presentation => {
        if (typeof c !== 'string') {
          return 'plain';
        }

        const maybePresentation = c as Presentation;

        if (!PRESENTATION.includes(maybePresentation)) {
          return 'plain';
        }

        return maybePresentation;
      },
      default: 'plain',
    })
    .help()
    .parse(hideBin(process.argv)) as MainArgs,
);