| 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('is-plain-object'); |
| const mapValues = require('object.map'); |
| 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'); |
| const getNodeFlags = require('./lib/get_node_flags'); |
| |
| |
| 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 = path.delimiter, |
| 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; |
| } |
| flags = flags || []; |
| |
| var env = this.buildEnvironment(opts); |
| |
| var forcedFlags = getNodeFlags.arrayOrFunction(opts.forcedFlags, env); |
| flaggedRespawn(flags, process.argv, forcedFlags, execute.bind(this)); |
| |
| function execute(ready, child, argv) { |
| if (child !== process) { |
| var execArgv = getNodeFlags.fromReorderedArgv(argv); |
| this.emit('respawn', execArgv, child); |
| } |
| if (ready) { |
| fn.call(this, env, argv); |
| } |
| } |
| }.bind(this)); |
| }; |
| |
| |
| |
| module.exports = Liftoff; |