run.js

import fetch from 'node-fetch';
import _ from 'lodash';
import fs from 'fs';

const writeReadme = async () => {
    const url = 'https://raw.githubusercontent.com/github/gemoji/master/db/emoji.json';

    const preamble = '# GitHub Emoji\n';

    const heading = '\n## {0}\n\n';
    const header = '| Emoji | Aliases | Description | Tags |\n| --- | --- | --- | --- |\n';
    const row = '| <span id="{0}">:{1}:</span> | {2} | {3} | {4} |\n';
    const cell = '`:{0}:`';

    const postamble = `\n# Build\n\nThis file is generated from the data in ${url}\n\n1. \`npm install\`\n2. \`npm run start\`\n`;

    const response = await fetch(url);
    const data = await response.json();

    let result = preamble;

    let categories = _(data)
        .groupBy(x => x.category)
        .map((value, key) => ({ name: key, emojis: value }))
        .value();

    for (let index in categories) {
        let category = categories[index];
        result += heading.replace('{0}', (category.name === 'undefined') ? 'Uncategorized' : category.name);
        result += header;

        for (let index in category.emojis) {
            let emoji = category.emojis[index];
            let aliases = '';

            for (let index in emoji.aliases) {
                if (aliases.length > 0) aliases += ' <br /> ';
                aliases += cell.replace('{0}', emoji.aliases[index]);
            }

            result += row
                .replace('{0}', emoji.aliases[0])
                .replace('{1}', emoji.aliases[0])
                .replace('{2}', aliases)
                .replace('{3}', emoji.description || '')
                .replace('{4}', emoji.tags.join(', '));
        }
    }

    result += postamble;

    fs.writeFile("README.md", result, function (err) {
        if (err) {
            return console.log('Error:', err);
        }
    });
}

const writeAvailable = async () => {
    const url = 'https://api.github.com/emojis';

    const preamble = '# GitHub Emoji\n\n';

    const header = '| Emoji | Alias |\n| --- | --- |\n';
    const row = '| :{0}: | `:{1}:` |\n';

    const postamble = `\n# Build\n\nThis file is generated from the data in ${url}\n\n1. \`npm install\`\n2. \`npm run start\`\n`;

    const response = await fetch(url);
    const data = await response.json();

    let result = preamble;
    result += header;

    for (let alias in data) {
        result += row
            .replace('{0}', alias)
            .replace('{1}', alias);
    }

    result += postamble;

    fs.writeFile("available.md", result, function (err) {
        if (err) {
            return console.log('Error:', err);
        }
    });
}

writeReadme();
writeAvailable();