Rename Google Web fonts as React Native Android font assets for cross platform naming compatibility

rename-fonts.js

// Rename Font files in Android React Native assets folder so can use easily on iOS and Android
// see https://blog.bam.tech/developper-news/add-a-custom-font-to-your-react-native-app

const fs = require("fs"), path = require("path");

const directory = path.join(".", "android", "app", "src", "main", "assets", "fonts");
const files = fs.readdirSync(directory);

const newName = name => {
  const [baseName, ext] = name.split(".");
  const [font, variant] = baseName.split("-");
  const newFontName = font.replace(/([A-Z])/g, " $1").trim();
  const newVariantName = variant.replace(/([A-Z])/g, "_$1").toLowerCase();
  return newFontName + newVariantName + "." + ext;
};

files.forEach(fn => {
  const newPath = path.join(directory, newName(fn));
  fs.renameSync(path.join(directory, fn), newPath);
});