Initial cut for a development server

lib/src/codegen/html_codegen.dart

Index: lib/src/codegen/html_codegen.dart
diff --git a/lib/src/codegen/html_codegen.dart b/lib/src/codegen/html_codegen.dart
index f080611a96b823012e2e9793a5b1c069e4004276..44c137601e67312cf788f924ecd0fbaffe652f11 100644
--- a/lib/src/codegen/html_codegen.dart
+++ b/lib/src/codegen/html_codegen.dart
@@ -4,14 +4,13 @@
 
 library ddc.src.codegen.html_codegen;
 
-import 'dart:io';
-
 import 'package:html5lib/dom.dart';
 import 'package:html5lib/parser.dart' show parseFragment;
-import 'package:path/path.dart' as path;
+import 'package:logging/logging.dart' show Logger;
 
-import 'package:dev_compiler/src/info.dart';
+import 'package:dev_compiler/src/dependency_graph.dart';
 import 'package:dev_compiler/src/options.dart';
+import 'package:dev_compiler/src/utils.dart' show colorOf;
 
 import 'js_codegen.dart' show jsLibraryName, jsOutputPath;
 
@@ -24,40 +23,48 @@ import 'js_codegen.dart' show jsLibraryName, jsOutputPath;
 /// application. When compiling to Dart, we ensure that the document contains a
 /// single Dart script tag, but otherwise emit the original document
 /// unmodified.
-void generateEntryHtml(String inputFile, CompilerOptions options,
-    CheckerResults results, Document document) {
-  String outputFile = path.join(options.outputDir, path.basename(inputFile));
-
+String generateEntryHtml(HtmlSourceNode root, CompilerOptions options) {
+  var document = root.document.clone(true);
   var scripts = document.querySelectorAll('script[type="application/dart"]');
-  var mainScript = scripts[0];
-  // TODO(sigmund): allow more than one Dart script tags?
-  scripts.skip(1).forEach((s) => s.remove());
-
-  if (options.outputDart) {
-    new File(outputFile).writeAsStringSync('${document.outerHtml}\n');
-    return;
+  if (scripts.isEmpty) {
+    _log.severe('No <script type="application/dart"> found in ${root.uri}');
+    return null;
   }
+  scripts.skip(1).forEach((s) {
+    // TODO(sigmund): allow more than one Dart script tags?
+    _log.warning(s.sourceSpan.message(
+        'unexpected script. Only one Dart script tag allowed '
+        '(see https://github.com/dart-lang/dart-dev-compiler/issues/53).',
+        color: options.useColors ? colorOf('warning') : false));
+    s.remove();
+  });
+
+  if (options.outputDart) return '${document.outerHtml}\n';
+
+  var libraries = [];
+  visitInPostOrder(root, (n) {
+    if (n is LibrarySourceNode) libraries.add(n);
+  });
 
   String mainLibraryName;
-  var pathToDdc = path.dirname(path
-      .dirname(path.relative(Platform.script.path, from: options.outputDir)));
-  var fragment = _loadRuntimeScripts(path.join(pathToDdc, 'lib'));
+  var fragment = _loadRuntimeScripts();
   if (!options.checkSdk) fragment.nodes.add(_miniMockSdk);
-  var root = new Uri.file(path.absolute(inputFile));
-  for (var lib in results.libraries) {
-    if (lib.isEntry) mainLibraryName = jsLibraryName(lib.library);
-    fragment.nodes.add(_libraryInclude(jsOutputPath(lib, root)));
+  for (var lib in libraries) {
+    var info = lib.info;
+    if (info == null) continue;
+    if (info.isEntry) mainLibraryName = jsLibraryName(info.library);
+    fragment.nodes.add(_libraryInclude(jsOutputPath(info, root.uri)));
   }
   fragment.nodes.add(_invokeMain(mainLibraryName));
-  mainScript.replaceWith(fragment);
-  new File(outputFile).writeAsStringSync('${document.outerHtml}\n');
+  scripts[0].replaceWith(fragment);
+  return '${document.outerHtml}\n';
 }
 
 /// A document fragment with scripts that check for harmony features and that
 /// inject our runtime.
-Node _loadRuntimeScripts(String ddcLibDir) => parseFragment('''
-<script src="$ddcLibDir/runtime/harmony_feature_check.js"></script>
-<script src="$ddcLibDir/runtime/dart_runtime.js"></script>
+Node _loadRuntimeScripts() => parseFragment('''
+<script src="dev_compiler/runtime/harmony_feature_check.js"></script>
+<script src="dev_compiler/runtime/dart_runtime.js"></script>
 ''');
 
 /// A script tag that loads the .js code for a compiled library.
@@ -78,3 +85,4 @@ Node get _miniMockSdk => parseFragment('''
   var core = { int: { parse: Number }, print: e => console.log(e) };
   var dom = { document: document };
 </script>''');
+final _log = new Logger('ddc.src.codegen.html_codegen');