docs: function run() {
      const updatedFiles = [];
      const passFiles = [];
      const pendingFiles = [];
  
      eachFile(function (absolutePath, fileExt) {
          const fileStr = fs.readFileSync(absolutePath, 'utf-8');
  
          const existLicense = preamble.extractLicense(fileStr, fileExt);
  
          if (existLicense) {
              passFiles.push(absolutePath);
              return;
          }
  
          // Conside binary files, only add for files with known ext.
          if (!preamble.hasPreamble(fileExt)) {
              pendingFiles.push(absolutePath);
              return;
          }
  
          fs.writeFileSync(absolutePath, preamble.addPreamble(fileStr, fileExt), 'utf-8');
          updatedFiles.push(absolutePath);
      });
  
      console.log('\n');
      console.log('----------------------------');
      console.log(' Files that exists license: ');
      console.log('----------------------------');
      if (passFiles.length) {
          if (isVerbose) {
              passFiles.forEach(function (path) {
                  console.log(color('fgGreen', 'dim')(path));
              });
          }
          else {
              console.log(color('fgGreen', 'dim')(passFiles.length + ' files. (use argument "--verbose" see details)'));
          }
      }
      else {
          console.log('Nothing.');
      }
  
      console.log('\n');
      console.log('--------------------');
      console.log(' License added for: ');
      console.log('--------------------');
      if (updatedFiles.length) {
          updatedFiles.forEach(function (path) {
              console.log(color('fgGreen', 'bright')(path));
          });
      }
      else {
          console.log('Nothing.');
      }
  
      console.log('\n');
      console.log('----------------');
      console.log(' Pending files: ');
      console.log('----------------');
      if (pendingFiles.length) {
          pendingFiles.forEach(function (path) {
              console.log(color('fgRed', 'dim')(path));
          });
      }
      else {
          console.log('Nothing.');
      }
  
      console.log('\nDone.');
  }