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 rechoir = require('rechoir'); 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'); 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); } // use rechoir to autoload any required modules var autoloads; if (configPath) { autoloads = rechoir.prepare(this.extensions, configPath, cwd, true); if (autoloads instanceof Error) { autoloads = autoloads.failures; } if (Array.isArray(autoloads)) { autoloads.forEach(function (attempt) { if (attempt.error) { this.emit('requireFail', attempt.moduleName, attempt.error); } else { this.emit('require', attempt.moduleName, attempt.module); } }, this); } } return { cwd: cwd, require: preload, configNameSearch: configNameSearch, configPath: configPath, configBase: configBase, modulePath: modulePath, modulePackage: modulePackage || {} }; }; 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;