generate_colors.js

#!/usr/bin/env node

const fs = require("fs-extra");
const path = require("path");

const Handlebars = require("handlebars");
const colorConvert = require("color-convert");
const klaw = require("klaw");

const TEMPLATE_DATA = {
  GENERATED_BLURB: "This is generated! Don't update manually!",
  colors: require("./colors.json")
}

/**
 * Convert the string into a usable programming identifier
 */
Handlebars.registerHelper("identifier", rawString => {
  // prepend x, because x is cool
  //   e.g. 20 => x20
  return /^[a-z]/.test(rawString) ? rawString : `x${rawString}`;
});


Handlebars.registerHelper("ternary", (predicate, yes, no) => predicate ? yes : no);
Handlebars.registerHelper("join", (sep, array) => array.join(sep));
Handlebars.registerHelper("keys", obj => Object.keys(obj));
Handlebars.registerHelper("rgb", hex => colorConvert.hex.rgb(hex));

function files(path) {
  return new Promise((resolve, reject) => {
    const paths = [];
    klaw(path)
      .on("data", item => item.stats.isFile() && paths.push(item.path))
      .on("error", reject)
      .on("end", () => resolve(paths));
  });
}

async function processTemplate(templatePath) {
  const source = await fs.readFile(templatePath, { encoding: "utf8" });
  const template = Handlebars.compile(source, { noEscape: true });
  const result = template(TEMPLATE_DATA);

  const outPath = templatePath.replace("tmpl", "dist").replace(/.hbs$/, "");
  await fs.mkdirp(path.dirname(outPath));
  return fs.writeFile(outPath, result);
}

async function main() {
  const paths = await files("./tmpl");
  await Promise.all(paths.map(processTemplate));
}

main();