Version 2.4.0-beta.0

[github/fretlink/purs-loader.git] / src / index.js

diff --git a/src/index.js b/src/index.js
index 7c296508a4e8b81cdb683d6351fd78b849f86984..f4a6dff29ba15171fb08eae6219739518f98fda4 100644 (file)
--- a/src/index.js
+++ b/src/index.js
@@ -3,15 +3,14 @@
 const debug = require('debug')('purs-loader')
 const loaderUtils = require('loader-utils')
 const Promise = require('bluebird')
-const fs = Promise.promisifyAll(require('fs'))
 const path = require('path')
-const jsStringEscape = require('js-string-escape')
 const PsModuleMap = require('./PsModuleMap');
 const Psc = require('./Psc');
 const PscIde = require('./PscIde');
+const toJavaScript = require('./to-javascript');
 const dargs = require('./dargs');
-
-const requireRegex = /require\(['"]\.\.\/([\w\.]+)['"]\)/g
+const spawn = require('cross-spawn').sync
+const eol = require('os').EOL
 
 module.exports = function purescriptLoader(source, map) {
   const callback = this.async()
@@ -19,34 +18,58 @@ module.exports = function purescriptLoader(source, map) {
   const query = loaderUtils.parseQuery(this.query)
   const webpackOptions = this.options.purescriptLoader || {}
 
-  const options = Object.assign({
+  const depsPaths = (pscPackage => {
+    if (pscPackage) {
+      debug('calling psc-package...')
+
+      return spawn('psc-package', ['sources']).stdout.toString().split(eol).filter(v => v != '')
+    }
+    else {
+      return [ path.join('bower_components', 'purescript-*', 'src', '**', '*.purs') ]
+    }
+  })
+
+  let options = Object.assign(webpackOptions, query)
+
+  const defaultDeps = depsPaths(options.pscPackage)
+  const defaultOptions = {
     context: config.context,
     psc: 'psc',
     pscArgs: {},
     pscBundle: 'psc-bundle',
     pscBundleArgs: {},
     pscIde: false,
-    pscIdeColors: webpackOptions.psc === 'psa' || query.psc === 'psa',
+    pscIdeColors: options.psc === 'psa',
     pscIdeArgs: {},
+    pscPackage: false,
     bundleOutput: 'output/bundle.js',
     bundleNamespace: 'PS',
     bundle: false,
     warnings: true,
+    watch: false,
     output: 'output',
     src: [
       path.join('src', '**', '*.purs'),
-      path.join('bower_components', 'purescript-*', 'src', '**', '*.purs')
+      ...defaultDeps
     ]
-  }, webpackOptions, query)
+  }
 
   this.cacheable && this.cacheable()
 
   let cache = config.purescriptLoaderCache = config.purescriptLoaderCache || {
     rebuild: false,
     deferred: [],
-    bundleModules: []
+    bundleModules: [],
+    warnings: [],
+    errors: []
   }
 
+  if (options.pscPackage && options.src) {
+    options.src = options.src.concat(defaultDeps) // append psc-package-provided source paths with users'
+  }
+
+  options = Object.assign(defaultOptions, options)
+
   if (!config.purescriptLoaderInstalled) {
     config.purescriptLoaderInstalled = true
 
@@ -59,9 +82,24 @@ module.exports = function purescriptLoader(source, map) {
         deferred: [],
         bundleModules: [],
         ideServer: cache.ideServer,
-        psModuleMap: cache.psModuleMap
+        psModuleMap: cache.psModuleMap,
+        warnings: [],
+        errors: []
       }
-    })
+    });
+
+    // add psc warnings to webpack compilation warnings
+    this._compiler.plugin('after-compile', (compilation, callback) => {
+      cache.warnings.forEach(warning => {
+        compilation.warnings.push(warning);
+      });
+
+      cache.errors.forEach(error => {
+        compilation.errors.push(error);
+      });
+
+      callback()
+    });
   }
 
   const psModuleName = PsModuleMap.match(source)
@@ -74,8 +112,16 @@ module.exports = function purescriptLoader(source, map) {
     jsPath: path.resolve(path.join(options.output, psModuleName, 'index.js')),
     options: options,
     cache: cache,
-    emitWarning: warning => this.emitWarning(warning),
-    emitError: error => this.emitError(error)
+    emitWarning: warning => {
+      if (options.warnings && warning.length) {
+        cache.warnings.push(warning);
+      }
+    },
+    emitError: error => {
+      if (error.length) {
+        cache.errors.push(error);
+      }
+    }
   }
 
   debug('loader called', psModule.name)
@@ -116,59 +162,3 @@ module.exports = function purescriptLoader(source, map) {
       })
   }
 }
-
-function updatePsModuleMap(psModule) {
-  const options = psModule.options
-  const cache = psModule.cache
-  const filePurs = psModule.srcPath
-  if (!cache.psModuleMap) {
-    debug('module mapping does not exist');
-    return PsModuleMap.makeMap(options.src).then(map => {
-      cache.psModuleMap = map;
-      return cache.psModuleMap;
-    });
-  }
-  else {
-    return PsModuleMap.makeMapEntry(filePurs).then(result => {
-      const map = Object.assign(cache.psModuleMap, result)
-      cache.psModuleMap = map;
-      return cache.psModuleMap;
-    });
-  }
-}
-
-// The actual loader is executed *after* purescript compilation.
-function toJavaScript(psModule) {
-  const options = psModule.options
-  const cache = psModule.cache
-  const bundlePath = path.resolve(options.bundleOutput)
-  const jsPath = cache.bundle ? bundlePath : psModule.jsPath
-
-  debug('loading JavaScript for', psModule.name)
-
-  return Promise.props({
-    js: fs.readFileAsync(jsPath, 'utf8'),
-    psModuleMap: updatePsModuleMap(psModule)
-  }).then(result => {
-    let js = ''
-
-    if (options.bundle) {
-      // if bundling, return a reference to the bundle
-      js = 'module.exports = require("'
-             + jsStringEscape(path.relative(psModule.srcDir, options.bundleOutput))
-             + '")["' + psModule.name + '"]'
-    } else {
-      // replace require paths to output files generated by psc with paths
-      // to purescript sources, which are then also run through this loader.
-      js = result.js
-        .replace(requireRegex, (m, p1) => {
-          return 'require("' + jsStringEscape(result.psModuleMap[p1].src) + '")'
-        })
-        .replace(/require\(['"]\.\/foreign['"]\)/g, (m, p1) => {
-          return 'require("' + jsStringEscape(result.psModuleMap[psModule.name].ffi) + '")'
-        })
-    }
-
-    return js
-  })
-}