move polymer.dart into dart svn

pkg/polymer/lib/dwc.dart

+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/** The entry point to the compiler. Used to implement `bin/dwc.dart`. */
+library dwc;
+
+import 'dart:async';
+import 'dart:io';
+import 'package:logging/logging.dart' show Level;
+
+import 'src/compiler.dart';
+import 'src/file_system.dart';
+import 'src/file_system/console.dart';
+import 'src/files.dart';
+import 'src/messages.dart';
+import 'src/compiler_options.dart';
+import 'src/utils.dart';
+
+FileSystem _fileSystem;
+
+void main() {
+  run(new Options().arguments).then((result) {
+    exit(result.success ? 0 : 1);
+  });
+}
+
+/** Contains the result of a compiler run. */
+class CompilerResult {
+  final bool success;
+
+  /** Map of output path to source, if there is one */
+  final Map<String, String> outputs;
+
+  /** List of files read during compilation */
+  final List<String> inputs;
+
+  final List<String> messages;
+  String bootstrapFile;
+
+  CompilerResult([this.success = true,
+                  this.outputs,
+                  this.inputs,
+                  this.messages = const [],
+                  this.bootstrapFile]);
+
+  factory CompilerResult._(bool success,
+      List<String> messages, List<OutputFile> outputs, List<SourceFile> files) {
+    var file;
+    var outs = new Map<String, String>();
+    for (var out in outputs) {
+      if (path.basename(out.path).endsWith('_bootstrap.dart')) {
+        file = out.path;
+      }
+      outs[out.path] = out.source;
+    }
+    var inputs = files.map((f) => f.path).toList();
+    return new CompilerResult(success, outs, inputs, messages, file);
+  }
+}
+
+/**
+ * Runs the web components compiler with the command-line options in [args].
+ * See [CompilerOptions] for the definition of valid arguments.
+ */
+// TODO(jmesserly): fix this to return a proper exit code
+// TODO(justinfagnani): return messages in the result
+Future<CompilerResult> run(List<String> args, {bool printTime,
+    bool shouldPrint: true}) {
+  var options = CompilerOptions.parse(args);
+  if (options == null) return new Future.value(new CompilerResult());
+  if (printTime == null) printTime = options.verbose;
+
+  _fileSystem = new ConsoleFileSystem();
+  var messages = new Messages(options: options, shouldPrint: shouldPrint);
+
+  return asyncTime('Total time spent on ${options.inputFile}', () {
+    var compiler = new Compiler(_fileSystem, options, messages);
+    var res;
+    return compiler.run()
+      .then((_) {
+        var success = messages.messages.every((m) => m.level != Level.SEVERE);
+        var msgs = options.jsonFormat
+            ? messages.messages.map((m) => m.toJson())
+            : messages.messages.map((m) => m.toString());
+        res = new CompilerResult._(success, msgs.toList(),
+            compiler.output, compiler.files);
+      })
+      .then((_) => _symlinkPubPackages(res, options, messages))
+      .then((_) => _emitFiles(compiler.output, options.clean))
+      .then((_) => res);
+  }, printTime: printTime, useColors: options.useColors);
+}
+
+Future _emitFiles(List<OutputFile> outputs, bool clean) {
+  outputs.forEach((f) => _writeFile(f.path, f.contents, clean));
+  return _fileSystem.flush();
+}
+
+void _writeFile(String filePath, String contents, bool clean) {
+  if (clean) {
+    File fileOut = new File(filePath);
+    if (fileOut.existsSync()) {
+      fileOut.deleteSync();
+    }
+  } else {
+    _createIfNeeded(path.dirname(filePath));
+    _fileSystem.writeString(filePath, contents);
+  }
+}
+
+void _createIfNeeded(String outdir) {
+  if (outdir.isEmpty) return;
+  var outDirectory = new Directory(outdir);
+  if (!outDirectory.existsSync()) {
+    _createIfNeeded(path.dirname(outdir));
+    outDirectory.createSync();
+  }
+}
+
+/**
+ * Creates a symlink to the pub packages directory in the output location. The
+ * returned future completes when the symlink was created (or immediately if it
+ * already exists).
+ */
+Future _symlinkPubPackages(CompilerResult result, CompilerOptions options,
+    Messages messages) {
+  if (options.outputDir == null || result.bootstrapFile == null
+      || options.packageRoot != null) {
+    // We don't need to copy the packages directory if the output was generated
+    // in-place where the input lives, if the compiler was called without an
+    // entry-point file, or if the compiler was called with a package-root
+    // option.
+    return new Future.value(null);
+  }
+
+  var linkDir = path.dirname(result.bootstrapFile);
+  _createIfNeeded(linkDir);
+  var linkPath = path.join(linkDir, 'packages');
+  // A resolved symlink works like a directory
+  // TODO(sigmund): replace this with something smarter once we have good
+  // symlink support in dart:io
+  if (new Directory(linkPath).existsSync()) {
+    // Packages directory already exists.
+    return new Future.value(null);
+  }
+
+  // A broken symlink works like a file
+  var toFile = new File(linkPath);
+  if (toFile.existsSync()) {
+    toFile.deleteSync();
+  }
+
+  var targetPath = path.join(path.dirname(options.inputFile), 'packages');
+  // [fullPathSync] will canonicalize the path, resolving any symlinks.
+  // TODO(sigmund): once it's possible in dart:io, we just want to use a full
+  // path, but not necessarily resolve symlinks.
+  var target = new File(targetPath).fullPathSync().toString();
+  return createSymlink(target, linkPath, messages: messages);
+}
+
+
+// TODO(jmesserly): this code was taken from Pub's io library.
+// Added error handling and don't return the file result, to match the code
+// we had previously. Also "target" and "link" only accept strings. And inlined
+// the relevant parts of runProcess. Note that it uses "cmd" to get the path
+// on Windows.
+/**
+ * Creates a new symlink that creates an alias of [target] at [link], both of
+ * which can be a [String], [File], or [Directory]. Returns a [Future] which
+ * completes to the symlink file (i.e. [link]).
+ */
+Future createSymlink(String target, String link, {Messages messages: null}) {
+  messages = messages == null? new Messages.silent() : messages;
+  var command = 'ln';
+  var args = ['-s', target, link];
+
+  if (Platform.operatingSystem == 'windows') {
+    // Call mklink on Windows to create an NTFS junction point. Only works on
+    // Vista or later. (Junction points are available earlier, but the "mklink"
+    // command is not.) I'm using a junction point (/j) here instead of a soft
+    // link (/d) because the latter requires some privilege shenanigans that
+    // I'm not sure how to specify from the command line.
+    command = 'cmd';
+    args = ['/c', 'mklink', '/j', link, target];
+  }
+
+  return Process.run(command, args).then((result) {
+    if (result.exitCode != 0) {
+      var details = 'subprocess stdout:\n${result.stdout}\n'
+                    'subprocess stderr:\n${result.stderr}';
+      messages.error(
+        'unable to create symlink\n target: $target\n link:$link\n$details',
+        null);
+    }
+    return null;
+  });
+}