feat(bootstrapper): new startup logic

This is a BREAKING CHANGE. aurelia-main is no longer supported. Instead
we use aurelia-app for both cases. If not value is provided for the
attr, then we use the default configuration and load app.js as the root
view model. If a value is provided we load that module which serves as
the configuration module. We’ve also added some new apis to aurelia.use
in order to streamline manual configuration.

src/index.js

@@ -57,7 +57,7 @@ function ensureLoader(){
     });
   }
 
-  return  Promise.resolve();
+  return Promise.resolve();
 }
 
 function preparePlatform(){
@@ -107,6 +107,8 @@ function preparePlatform(){
   });
 }
 
+var installedDevelopmentLogging = false;
+
 function configureAurelia(aurelia){
   return System.normalize('aurelia-bootstrapper').then(function(bName){
     var toLoad = [];
@@ -144,67 +146,76 @@ function configureAurelia(aurelia){
       };
     }));
 
+    aurelia.use.standardConfiguration = function(){
+      aurelia.use
+        .defaultBindingLanguage()
+        .defaultResources()
+        .router()
+        .eventAggregator();
+      return this;
+    };
+
+    aurelia.use.developmentLogging = function(){
+      if(!installedDevelopmentLogging){
+        installedDevelopmentLogging = true;
+        LogManager.addAppender(new ConsoleAppender());
+        LogManager.setLevel(LogManager.levels.debug);
+      }
+      return this;
+    }
+
     return Promise.all(toLoad);
   });
 }
 
-function handleMain(mainHost){
-  var mainModuleId = mainHost.getAttribute('aurelia-main') || 'main',
-      loader = new window.AureliaLoader();
-
-  return loader.loadModule(mainModuleId)
-    .then(m => {
-      var aurelia = new Aurelia(loader);
-      return configureAurelia(aurelia).then(() => { return m.configure(aurelia); });
-    }).catch(e => {
-      setTimeout(function(){ throw e; }, 0);
-    });
+function runningLocally(){
+  return window.location.protocol !== 'http' && window.location.protocol !== 'https';
 }
 
 function handleApp(appHost){
-  var appModuleId = appHost.getAttribute('aurelia-app') || './app',
-      aurelia = new Aurelia();
-
-  return configureAurelia(aurelia).then(() => {
-    aurelia.use
-      .defaultBindingLanguage()
-      .defaultResources()
-      .router()
-      .eventAggregator();
-
-    if(appHost.hasAttribute('es5')){
-      aurelia.use.es5();
-    } else if(appHost.hasAttribute('atscript')){
-      aurelia.use.atscript();
-    }
+  var configModuleId = appHost.getAttribute('aurelia-app'),
+      aurelia, loader;
 
-    return aurelia.start().then(a => { return a.setRoot(appModuleId, appHost); });
-  }).catch(e => {
-    setTimeout(function(){ throw e; }, 0);
-  });
-}
+  if(configModuleId){
+    loader = new window.AureliaLoader();
 
-function runningLocally(){
-  return window.location.protocol !== 'http' &&
-    window.location.protocol !== 'https';
+    return loader.loadModule(configModuleId)
+      .then(m => {
+        aurelia = new Aurelia(loader);
+        return configureAurelia(aurelia).then(() => { return m.configure(aurelia); });
+      }).catch(e => {
+        setTimeout(function(){ throw e; }, 0);
+      });
+  }else{
+    aurelia = new Aurelia();
+
+    return configureAurelia(aurelia).then(() => {
+      if(runningLocally()){
+        aurelia.use.developmentLogging();
+      }
+
+      aurelia.use.standardConfiguration();
+
+      if(appHost.hasAttribute('es5')){
+        aurelia.use.es5();
+      } else if(appHost.hasAttribute('atscript')){
+        aurelia.use.atscript();
+      }
+
+      return aurelia.start().then(a => { return a.setRoot(undefined, appHost); });
+    }).catch(e => {
+      setTimeout(function(){ throw e; }, 0);
+    });
+  }
 }
 
 function run() {
-  return ready(window).then(function (doc) {
-    var mainHost = doc.querySelectorAll("[aurelia-main]"),
-        appHost = doc.querySelectorAll("[aurelia-app]"),
-        i, ii;
-
-    if (appHost.length && !mainHost.length && runningLocally()) {
-      LogManager.addAppender(new ConsoleAppender());
-      LogManager.setLevel(LogManager.levels.debug);
-    }
+  return ready(window).then(doc => {
+    var appHost = doc.querySelectorAll("[aurelia-app]");
 
     return ensureLoader().then(() => {
       return preparePlatform().then(function(){
-        for (i = 0, ii = mainHost.length; i < ii; ++i) {
-          handleMain(mainHost[i]);
-        }
+        var i, ii;
 
         for (i = 0, ii = appHost.length; i < ii; ++i) {
           handleApp(appHost[i]);