npm-open/index.js

Open homepage for npm package in the browser, github or website

'use strict';

var npmconf = require('npmconf')
  , opn = require('opn');

var path = require('path');


var pkgFromDirectory = function (directory, cb) {
  npmconf.Conf().findPrefix(directory, function (err, prefix) {
    if (err) return cb(err);

    try {
      var pkgPath = path.resolve(prefix, 'package.json');
      var pkg = require(pkgPath);
      return cb(null, pkg);
    }
    catch (err) {
      return cb(err);
    }
  });
};


var homepage = function (pkg) {
  if (pkg.homepage) {
    return pkg.homepage;
  }

  if (pkg.repository && pkg.repository.url) {
    return pkg.repository.url;
  }

  throw new Error('Unable to determine the home page.');
};


var npmUrl = function (pkg) {
  if (!pkg.name) {
    throw new Error('Unable to determine package name.');
  }

  return 'http://npm.im/' + pkg.name;
};


var npmOpener = function (getUrl) {
  return function (directory) {
    pkgFromDirectory(directory, function (err, pkg) {
      if (err) throw err;
      opn(getUrl(pkg));
    });
  };
};

module.exports = npmOpener(homepage);
module.exports.npm = npmOpener(npmUrl);