cleanIcon.js

#!/bin/env node
let path = require("path"), fs = require("fs");

function fromDir(startPath, filter, callback) {

  if (!fs.existsSync(startPath)) {
    console.log("no dir ", startPath);
    return;
  }

  let files = fs.readdirSync(startPath);
  for (let i = 0; i < files.length; i++) {
    let filename = path.join(startPath, files[i]);
    let stat = fs.lstatSync(filename);
    if (stat.isDirectory()) {
      fromDir(filename, filter, callback); //recurse
    } else if (filter.test(filename)) {
      callback(filename, files[i]);
    }
  }
}

function justPrint(filePath, fileName) {
  console.log("-- found: ", fileName.split(".")[0]);
}

let iconNames = [];

function addTolist(filePath, fileName) {
  iconNames.push({
    iconName: fileName.split(".")[0],
    filePath,
    used: false
  });
}

function checkIfUnsused(filePath, fileName) {
  let data = fs.readFileSync(filePath);
  iconNames.forEach((icon, index, iconList) => {
    if (data.includes(`${icon.iconName}`)) {
      console.log("--- icon used", icon.iconName);
      iconList[index].used = true;
    }
  });
}

fromDir("www/svg", /\.svg$/, justPrint);
fromDir("www/svg", /\.svg$/, addTolist);
fromDir("www", /\.(js|css|html)$/, checkIfUnsused);

iconNames.forEach((icon) => {
  if (!icon.used) {
    console.log("--- will delete unused icon", icon.iconName);
    fs.unlink(icon.filePath, (err) => {
      if (err) {
        console.error(err);
      }
    });
  }
});