ModuleBuilder/src/preprocessors/bdTheme.js

import { readFileSync, writeFileSync, mkdirSync, rmSync } from 'fs';

export default (themePath, repo) => {
  const content = readFileSync(themePath);
  
  const metaReg = /@([^ ]*) (.*)/g;

  let manifest = {
    main: 'index.js',
    tags: ['theme', 'port']
  };

  let match;
  while ((match = metaReg.exec(content)) !== null) {
    const [_, key, value] = match;
    if (key === 'import') break;

//    console.log(key, value);

    switch (key) {
      case 'name':
        manifest.name = value;
        break;

      case 'description':
        manifest.description = value;
        break;

      case 'version':
        manifest.version = value;
        break;

      case 'author':
        manifest.authors = [ value ];
        break;

      case 'authorId':
        manifest.authors = [ value ];
        break;
    }
  }

  manifest = Object.assign(manifest, repo[4]);

  rmSync(themePath);
  mkdirSync(themePath);

  const jsCode = `// Generated by MS2Builder - bdTheme preprocessor / porter
let style;

export default {
  goosemodHandlers: {
    onImport: async () => {
      style = document.createElement("style");
      document.head.appendChild(style);
      style.appendChild(
        document.createTextNode(
          \`${content}\`
        )
      );
    },
  
    onRemove: async () => {
      style.remove();
    },
  }
};`;

  writeFileSync(`${themePath}/goosemodModule.json`, JSON.stringify(manifest));
  writeFileSync(`${themePath}/index.js`, jsCode);
};