var Module, path;

path = require('path');

Module = require('module');


/* Clear Node's global search paths. */

Module.globalPaths.length = 0;


/* Clear current and parent(init.coffee)'s search paths. */

module.paths = [];

module.parent.paths = [];


/* Prevent Node from adding paths outside this app to search paths. */

Module._nodeModulePaths = function(from) {
  var dir, i, part, parts, paths, skipOutsidePaths, splitRe, tip;
  from = path.resolve(from);

  /* If "from" is outside the app then we do nothing. */
  skipOutsidePaths = from.startsWith(process.resourcesPath);

  /* Following logoic is copied from module.js. */
  splitRe = process.platform === 'win32' ? /[\/\\]/ : /\//;
  paths = [];
  parts = from.split(splitRe);
  for (tip = i = parts.length - 1; i >= 0; tip = i += -1) {
    part = parts[tip];
    if (part === 'node_modules') {
      continue;
    }
    dir = parts.slice(0, tip + 1).join(path.sep);
    if (skipOutsidePaths && !dir.startsWith(process.resourcesPath)) {
      break;
    }
    paths.push(path.join(dir, 'node_modules'));
  }
  return paths;
};