add node_modules to address #4364

1 files changed, 210 insertions, 0 deletions

diff --git a/node_modules/liftoff/index.js b/node_modules/liftoff/index.js
new file mode 100644
index 000000000..0c0a8d5e9
--- /dev/null
+++ b/node_modules/liftoff/index.js
@@ -0,0 +1,210 @@
+const fs = require('fs');
+const util = require('util');
+const path = require('path');
+const EE = require('events').EventEmitter;
+
+const extend = require('extend');
+const resolve = require('resolve');
+const flaggedRespawn = require('flagged-respawn');
+const isPlainObject = require('lodash.isplainobject');
+const mapValues = require('lodash.mapvalues');
+const fined = require('fined');
+
+const findCwd = require('./lib/find_cwd');
+const findConfig = require('./lib/find_config');
+const fileSearch = require('./lib/file_search');
+const parseOptions = require('./lib/parse_options');
+const silentRequire = require('./lib/silent_require');
+const buildConfigName = require('./lib/build_config_name');
+const registerLoader = require('./lib/register_loader');
+
+
+function Liftoff (opts) {
+  EE.call(this);
+  extend(this, parseOptions(opts));
+}
+util.inherits(Liftoff, EE);
+
+Liftoff.prototype.requireLocal = function (module, basedir) {
+  try {
+    var result = require(resolve.sync(module, {basedir: basedir}));
+    this.emit('require', module, result);
+    return result;
+  } catch (e) {
+    this.emit('requireFail', module, e);
+  }
+};
+
+Liftoff.prototype.buildEnvironment = function (opts) {
+  opts = opts || {};
+
+  // get modules we want to preload
+  var preload = opts.require || [];
+
+  // ensure items to preload is an array
+  if (!Array.isArray(preload)) {
+    preload = [preload];
+  }
+
+  // make a copy of search paths that can be mutated for this run
+  var searchPaths = this.searchPaths.slice();
+
+  // calculate current cwd
+  var cwd = findCwd(opts);
+
+  // if cwd was provided explicitly, only use it for searching config
+  if (opts.cwd) {
+    searchPaths = [cwd];
+  } else {
+    // otherwise just search in cwd first
+    searchPaths.unshift(cwd);
+  }
+
+  // calculate the regex to use for finding the config file
+  var configNameSearch = buildConfigName({
+    configName: this.configName,
+    extensions: Object.keys(this.extensions)
+  });
+
+  // calculate configPath
+  var configPath = findConfig({
+    configNameSearch: configNameSearch,
+    searchPaths: searchPaths,
+    configPath: opts.configPath
+  });
+
+  // if we have a config path, save the directory it resides in.
+  var configBase;
+  if (configPath) {
+    configBase = path.dirname(configPath);
+    // if cwd wasn't provided explicitly, it should match configBase
+    if (!opts.cwd) {
+      cwd = configBase;
+    }
+    // resolve symlink if needed
+    if (fs.lstatSync(configPath).isSymbolicLink()) {
+      configPath = fs.realpathSync(configPath);
+    }
+  }
+
+  // TODO: break this out into lib/
+  // locate local module and package next to config or explicitly provided cwd
+  var modulePath, modulePackage;
+  try {
+    var delim = (process.platform === 'win32' ? ';' : ':'),
+        paths = (process.env.NODE_PATH ? process.env.NODE_PATH.split(delim) : []);
+    modulePath = resolve.sync(this.moduleName, {basedir: configBase || cwd, paths: paths});
+    modulePackage = silentRequire(fileSearch('package.json', [modulePath]));
+  } catch (e) {}
+
+  // if we have a configuration but we failed to find a local module, maybe
+  // we are developing against ourselves?
+  if (!modulePath && configPath) {
+    // check the package.json sibling to our config to see if its `name`
+    // matches the module we're looking for
+    var modulePackagePath = fileSearch('package.json', [configBase]);
+    modulePackage = silentRequire(modulePackagePath);
+    if (modulePackage && modulePackage.name === this.moduleName) {
+      // if it does, our module path is `main` inside package.json
+      modulePath = path.join(path.dirname(modulePackagePath), modulePackage.main || 'index.js');
+      cwd = configBase;
+    } else {
+      // clear if we just required a package for some other project
+      modulePackage = {};
+    }
+  }
+
+  // load any modules which were requested to be required
+  if (preload.length) {
+    // unique results first
+    preload.filter(function (value, index, self) {
+      return self.indexOf(value) === index;
+    }).forEach(function (dep) {
+      this.requireLocal(dep, findCwd(opts));
+    }, this);
+  }
+
+  var exts = this.extensions;
+  var eventEmitter = this;
+  registerLoader(eventEmitter, exts, configPath, cwd);
+
+  var configFiles = {};
+  if (isPlainObject(this.configFiles)) {
+    var notfound = { path: null };
+    configFiles = mapValues(this.configFiles, function(prop, name) {
+      var defaultObj = { name: name, cwd: cwd, extensions: exts };
+      return mapValues(prop, function(pathObj) {
+        var found = fined(pathObj, defaultObj) || notfound;
+        if (isPlainObject(found.extension)) {
+          registerLoader(eventEmitter, found.extension, found.path, cwd);
+        }
+        return found.path;
+      });
+    });
+  }
+
+  return {
+    cwd: cwd,
+    require: preload,
+    configNameSearch: configNameSearch,
+    configPath: configPath,
+    configBase: configBase,
+    modulePath: modulePath,
+    modulePackage: modulePackage || {},
+    configFiles: configFiles
+  };
+};
+
+Liftoff.prototype.handleFlags = function (cb) {
+  if (typeof this.v8flags === 'function') {
+    this.v8flags(function (err, flags) {
+      if (err) {
+        cb(err);
+      } else {
+        cb(null, flags);
+      }
+    });
+  } else {
+    process.nextTick(function () {
+      cb(null, this.v8flags);
+    }.bind(this));
+  }
+};
+
+Liftoff.prototype.launch = function (opts, fn) {
+  if (typeof fn !== 'function') {
+    throw new Error('You must provide a callback function.');
+  }
+  process.title = this.processTitle;
+
+  var completion = opts.completion;
+  if (completion && this.completions) {
+    return this.completions(completion);
+  }
+
+  this.handleFlags(function (err, flags) {
+    if (err) {
+      throw err;
+    } else {
+      if (flags) {
+        flaggedRespawn(flags, process.argv, function (ready, child) {
+          if (child !== process) {
+            this.emit('respawn', process.argv.filter(function (arg) {
+              var flag = arg.split('=')[0];
+              return flags.indexOf(flag) !== -1;
+            }.bind(this)), child);
+          }
+          if (ready) {
+            fn.call(this, this.buildEnvironment(opts));
+          }
+        }.bind(this));
+      } else {
+        fn.call(this, this.buildEnvironment(opts));
+      }
+    }
+  }.bind(this));
+};
+
+
+
+module.exports = Liftoff;