src/index.js

   1 'use strict'
   2
   3 const debug_ = require('debug');
   4
   5 const debug = debug_('purs-loader');
   6
   7 const debugVerbose = debug_('purs-loader:verbose');
   8
   9 const loaderUtils = require('loader-utils')
  10
  11 const Promise = require('bluebird')
  12
  13 const path = require('path')
  14
  15 const PsModuleMap = require('./purs-module-map');
  16
  17 const compile = require('./compile');
  18
  19 const bundle = require('./bundle');
  20
  21 const ide = require('./ide');
  22
  23 const toJavaScript = require('./to-javascript');
  24
  25 const dargs = require('./dargs');
  26
  27 const spawn = require('cross-spawn').sync
  28
  29 const eol = require('os').EOL
  30
  31 module.exports = function purescriptLoader(source, map) {
  32   this.cacheable && this.cacheable();
  33
  34   const webpackConfig = this.options;
  35
  36   var cache = webpackConfig.purescriptLoaderCache = webpackConfig.purescriptLoaderCache || {
  37     rebuild: false,
  38     deferred: [],
  39     bundleModules: [],
  40     ideServer: null,
  41     psModuleMap: null,
  42     warnings: [],
  43     errors: [],
  44     compilationStarted: false,
  45     compilationFinished: false,
  46     installed: false,
  47     srcOption: []
  48   };
  49
  50   const callback = this.async();
  51
  52   const loaderOptions = loaderUtils.getOptions(this) || {};
  53
  54   const srcOption = (pscPackage => {
  55     const srcPath = path.join('src', '**', '*.purs');
  56
  57     const bowerPath = path.join('bower_components', 'purescript-*', 'src', '**', '*.purs');
  58
  59     if (cache.srcOption.length > 0) {
  60       return cache.srcOption;
  61     }
  62     else if (pscPackage) {
  63       const pscPackageCommand = 'psc-package';
  64
  65       const pscPackageArgs = ['sources'];
  66
  67       const loaderSrc = loaderOptions.src || [
  68         srcPath
  69       ];
  70
  71       debug('psc-package %s %o', pscPackageCommand, pscPackageArgs);
  72
  73       const cmd = spawn(pscPackageCommand, pscPackageArgs);
  74
  75       if (cmd.error) {
  76         throw new Error(cmd.error);
  77       }
  78       else if (cmd.status !== 0) {
  79         const error = cmd.stdout.toString();
  80
  81         throw new Error(error);
  82       }
  83       else {
  84         const result = cmd.stdout.toString().split(eol).filter(v => v != '').concat(loaderSrc);
  85
  86         debug('psc-package result: %o', result);
  87
  88         cache.srcOption = result;
  89
  90         return result;
  91       }
  92     }
  93     else {
  94       const result = loaderOptions.src || [
  95         bowerPath,
  96         srcPath
  97       ];
  98
  99       cache.srcOption = result;
 100
 101       return result;
 102     }
 103   })(loaderOptions.pscPackage);
 104
 105   const options = Object.assign({
 106     context: webpackConfig.context,
 107     psc: null,
 108     pscArgs: {},
 109     pscBundle: null,
 110     pscBundleArgs: {},
 111     pscIde: false,
 112     pscIdeColors: loaderOptions.psc === 'psa',
 113     pscIdeArgs: {},
 114     pscPackage: false,
 115     bundleOutput: 'output/bundle.js',
 116     bundleNamespace: 'PS',
 117     bundle: false,
 118     warnings: true,
 119     watch: false,
 120     output: 'output',
 121     src: []
 122   }, loaderOptions, {
 123     src: srcOption
 124   });
 125
 126   if (!cache.installed) {
 127     debugVerbose('installing purs-loader with options: %O', options);
 128
 129     cache.installed = true;
 130
 131     // invalidate loader cache when bundle is marked as invalid (in watch mode)
 132     this._compiler.plugin('invalid', () => {
 133       debugVerbose('invalidating loader cache');
 134
 135       cache = webpackConfig.purescriptLoaderCache = {
 136         rebuild: options.pscIde,
 137         deferred: [],
 138         bundleModules: [],
 139         ideServer: cache.ideServer,
 140         psModuleMap: cache.psModuleMap,
 141         warnings: [],
 142         errors: [],
 143         compilationStarted: false,
 144         compilationFinished: false,
 145         installed: cache.installed,
 146         srcOption: []
 147       };
 148     });
 149
 150     // add psc warnings to webpack compilation warnings
 151     this._compiler.plugin('after-compile', (compilation, callback) => {
 152       cache.warnings.forEach(warning => {
 153         compilation.warnings.push(warning);
 154       });
 155
 156       cache.errors.forEach(error => {
 157         compilation.errors.push(error);
 158       });
 159
 160       callback()
 161     });
 162   }
 163
 164   const psModuleName = PsModuleMap.matchModule(source);
 165
 166   const psModule = {
 167     name: psModuleName,
 168     load: js => callback(null, js),
 169     reject: error => callback(error),
 170     srcPath: this.resourcePath,
 171     srcDir: path.dirname(this.resourcePath),
 172     jsPath: path.resolve(path.join(options.output, psModuleName, 'index.js')),
 173     options: options,
 174     cache: cache,
 175     emitWarning: warning => {
 176       if (options.warnings && warning.length) {
 177         cache.warnings.push(warning);
 178       }
 179     },
 180     emitError: error => {
 181       if (error.length) {
 182         cache.errors.push(error);
 183       }
 184     }
 185   }
 186
 187   debug('loading %s', psModule.name);
 188
 189   if (options.bundle) {
 190     cache.bundleModules.push(psModule.name);
 191   }
 192
 193   if (cache.rebuild) {
 194     const connect = () => {
 195       if (!cache.ideServer) {
 196         cache.ideServer = true;
 197
 198         return ide.connect(psModule)
 199           .then(ideServer => {
 200             cache.ideServer = ideServer;
 201             return psModule;
 202           })
 203           .then(ide.loadWithRetry)
 204           .catch(error => {
 205             if (cache.ideServer.kill) {
 206               debug('ide failed to initially load modules, stopping the ide server process');
 207
 208               cache.ideServer.kill();
 209             }
 210
 211             cache.ideServer = null;
 212
 213             return Promise.reject(error);
 214           })
 215         ;
 216       }
 217       else {
 218         return Promise.resolve(psModule);
 219       }
 220     };
 221
 222     const rebuild = () =>
 223       ide.rebuild(psModule)
 224       .then(() =>
 225         toJavaScript(psModule)
 226           .then(psModule.load)
 227           .catch(psModule.reject)
 228       )
 229       .catch(error => {
 230         if (error instanceof ide.UnknownModuleError) {
 231           // Store the modules that trigger a recompile due to an
 232           // unknown module error. We need to wait until compilation is
 233           // done before loading these files.
 234
 235           cache.deferred.push(psModule);
 236
 237           if (!cache.compilationStarted) {
 238             cache.compilationStarted = true;
 239
 240             return compile(psModule)
 241               .then(() => {
 242                 cache.compilationFinished = true;
 243               })
 244               .then(() =>
 245                 PsModuleMap.makeMap(options.src).then(map => {
 246                   debug('rebuilt module map after unknown module forced a recompilation');
 247
 248                   cache.psModuleMap = map;
 249                 })
 250               )
 251               .then(() =>
 252                 Promise.map(cache.deferred, psModule =>
 253                   ide.load(psModule)
 254                     .then(() => toJavaScript(psModule))
 255                     .then(psModule.load)
 256                 )
 257               )
 258               .catch(error => {
 259                 cache.deferred[0].reject(error);
 260
 261                 cache.deferred.slice(1).forEach(psModule => {
 262                   psModule.reject(new Error('purs-loader failed'));
 263                 })
 264               })
 265             ;
 266           }
 267           else {
 268             // The compilation has started. We must wait until it is
 269             // done in order to ensure the module map contains all of
 270             // the unknown modules.
 271           }
 272         }
 273         else {
 274           debug('ide rebuild failed due to an unhandled error: %o', error);
 275
 276           psModule.reject(error);
 277         }
 278       })
 279     ;
 280
 281     connect().then(rebuild);
 282   }
 283   else if (cache.compilationFinished) {
 284     debugVerbose('compilation is already finished, loading module %s', psModule.name);
 285
 286     toJavaScript(psModule)
 287       .then(psModule.load)
 288       .catch(psModule.reject);
 289   }
 290   else {
 291     // The compilation has not finished yet. We need to wait for
 292     // compilation to finish before the loaders run so that references
 293     // to compiled output are valid. Push the modules into the cache to
 294     // be loaded once the complation is complete.
 295
 296     cache.deferred.push(psModule);
 297
 298     if (!cache.compilationStarted) {
 299       cache.compilationStarted = true;
 300
 301       compile(psModule)
 302         .then(() => {
 303           cache.compilationFinished = true;
 304         })
 305         .then(() => {
 306           if (options.bundle) {
 307             return bundle(options, cache.bundleModules);
 308           }
 309         })
 310         .then(() =>
 311           PsModuleMap.makeMap(options.src).then(map => {
 312             debug('rebuilt module map after compilation');
 313
 314             cache.psModuleMap = map;
 315           })
 316         )
 317         .then(() =>
 318           Promise.map(cache.deferred, psModule =>
 319             toJavaScript(psModule)
 320               .then(psModule.load)
 321           )
 322         )
 323         .catch(error => {
 324           cache.deferred[0].reject(error);
 325
 326           cache.deferred.slice(1).forEach(psModule => {
 327             psModule.reject(new Error('purs-loader failed'));
 328           })
 329         })
 330       ;
 331     }
 332     else {
 333       // The complation has started. Nothing to do but wait until it is
 334       // done before loading all of the modules.
 335     }
 336   }
 337 }