Find and encode all Base64 strings to SVG files

b64_to_image.js

var fs = require('fs');

var grepWithShell = function(files, outFile, done) {
  var exec = require('child_process').exec;
  var res = '';
  exec('grep -oh "\\"data:image[^\\"]*\\"" ./**/*.* > b64_temp.txt', function(
    err
  ) {
    done(outFile);
  });
};

function extractImages(file) {
  var total = 0;
  fs.readFile('b64_temp.txt', 'utf8', function(err, contents) {
    var arr = contents.split('"');

    var dir = __dirname + '/b64_to_SVG_images';
    if (!fs.existsSync(dir)) {
      fs.mkdirSync(dir);
    }

    arr.forEach((string, i) => {
      if (string.length <= 1) {
        return;
      }
      total += 1;
      fs.writeFile(
        `./b64_to_SVG_images/image_${i}.svg`,
        new Buffer(string.replace('data:image/svg+xml;base64,', ''), 'base64'),
        () => {}
      );
    });
    console.log('Images saved: ', total);
  });

  fs.unlink('b64_temp.txt', err => {
    if (err) throw err;
  });
}

grepWithShell('./**/*.*', 'b64_temp.txt', extractImages);