var exec = require('child_process').exec;
var fs = require('fs');
let LineReader = require('readline');

var execute = function(command, cb) {
  var child = exec(command, function(err, stdout, stderr) {
    if (err != null) {
      return cb(new Error(err), null);
    } else if (typeof stderr != 'string') {
      return cb(new Error(stderr), null);
    } else {
      return cb(null, stdout);
    }
  });
};

let readerInterface = LineReader.createInterface({
  input: fs.createReadStream('data')
});

readerInterface.on('line', function(line) {
  console.log('branch:', line);

  execute(`git branch -D ${line}`, function(err, result) {
    console.log(err, result);
  });
});