module.exports = isexe;
isexe.sync = sync;

var fs = require('fs');

function checkPathExt(path, options) {
  var pathext =
    options.pathExt !== undefined ? options.pathExt : process.env.PATHEXT;

  if (!pathext) {
    return true;
  }

  pathext = pathext.split(';');
  if (pathext.indexOf('') !== -1) {
    return true;
  }
  for (var i = 0; i < pathext.length; i++) {
    var p = pathext[i].toLowerCase();
    if (p && path.substr(-p.length).toLowerCase() === p) {
      return true;
    }
  }
  return false;
}

function checkStat(stat, path, options) {
  if (!stat.isSymbolicLink() && !stat.isFile()) {
    return false;
  }
  return checkPathExt(path, options);
}

function isexe(path, options, cb) {
  fs.stat(path, function (er, stat) {
    cb(er, er ? false : checkStat(stat, path, options));
  });
}

function sync(path, options) {
  return checkStat(fs.statSync(path), path, options);
}