remove docgen source and targets from build

pkg/docgen/lib/src/package_helpers.dart

-// Copyright (c) 2014, 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.
-
-library docgen.package_helpers;
-
-import 'exports/source_mirrors.dart';
-import 'generator.dart' show pubScript;
-
-import 'dart:io';
-import 'package:path/path.dart' as path;
-import 'package:yaml/yaml.dart';
-
-/// Helper accessor to determine the full pathname of the root of the dart
-/// checkout if we are running without the --sdk parameter specified. That
-/// normally means we are running directly from source, and we expect to
-/// find the root as the directory above 'pkg'. The only other time this
-/// would happen is running a snapshot directly, rather than from the
-/// dartdocgen script, where we look for the dart-sdk directory. If not
-/// using the script and not in a normal directory structure, you'll need
-/// to pass the --sdk parameter.
-String get rootDirectory {
-  if (_rootDirectoryCache != null) return _rootDirectoryCache;
-  var scriptDir = path.absolute(path.dirname(Platform.script.toFilePath()));
-  var root = scriptDir;
-  var base = path.basename(root);
-  while (base != 'dart-sdk' && base != 'pkg') {
-    root = path.dirname(root);
-    base = path.basename(root);
-    if (root == base) {
-      // We have reached the root of the filesystem without finding anything.
-      throw new FileSystemException("Cannot find SDK directory starting from ",
-          scriptDir);
-    }
-  }
-  _rootDirectoryCache = path.dirname(root);
-  return _rootDirectoryCache;
-}
-String _rootDirectoryCache;
-
-/// Given a LibraryMirror that is a library, return the name of the directory
-/// holding the package information for that library. If the library is not
-/// part of a package, return null.
-String getPackageDirectory(LibraryMirror mirror) {
-  var file = mirror.uri.toFilePath();
-  // Any file that's in a package will be in a directory of the form
-  // packagename/lib/.../filename.dart, so we know that a possible
-  // package directory is at least in the directory above the one containing
-  // [file]
-  var directoryAbove = path.dirname(path.dirname(file));
-  var possiblePackage = _packageDirectoryFor(directoryAbove);
-  // We only want components that are somewhere underneath the lib directory.
-  var subPath = path.relative(file, from: possiblePackage);
-  var subPathComponents = path.split(subPath);
-  if (subPathComponents.isNotEmpty && subPathComponents.first == 'lib') {
-    return possiblePackage;
-  } else {
-    return null;
-  }
-}
-
-Map _getPubspec(String directoryName) {
-  var pubspecName = path.join(directoryName, 'pubspec.yaml');
-  File pubspec = new File(pubspecName);
-  if (!pubspec.existsSync()) return {'name': ''};
-  var contents = pubspec.readAsStringSync();
-  return loadYaml(contents);
-}
-
-/// Read a pubspec and return the library name, given a directory
-String packageNameFor(String directoryName) =>
-    _getPubspec(directoryName)['name'];
-
-/// Read a pubspec and return the library name, given a directory
-String _packageVersionFor(String directoryName) {
-  var spec = _getPubspec(directoryName);
-  return '${spec['name']}-${spec['version']}';
-}
-
-/// Look in the pubspec.lock to determine what version of a package we are
-/// documenting (null if not applicable).
-String packageVersion(LibraryMirror mirror) {
-  if (mirror.uri.scheme == 'file') {
-    String packageDirectory = getPackageDirectory(mirror);
-    if (packageDirectory == null) return '';
-    if (packageDirectory.contains('.pub-cache')) {
-      return path.basename(packageDirectory);
-    }
-    String packageName = packageNameFor(packageDirectory);
-    return _packageVersionFor(packageDirectory);
-  } else if (mirror.uri.scheme == 'dart') {
-    // If this item is from the SDK, use what version of pub we're running to
-    // ascertain the SDK version.
-    var pubVersion = Process.runSync(pubScript, ['--version'],
-        runInShell: true);
-    if (pubVersion.exitCode != 0) {
-      print(pubVersion.stderr);
-    }
-    return pubVersion.stdout.replaceAll('Pub ', '').trim();
-  }
-  return '';
-}
-
-String _packageVersionHelper(String packageDirectory, String packageName) {
-  var publockName = path.join(packageDirectory, 'pubspec.lock');
-  File publock = new File(publockName);
-  if (!publock.existsSync()) return '';
-  var contents = publock.readAsStringSync();
-  var spec = loadYaml(contents);
-  return spec['packages'][packageName];
-}
-
-/// Recursively walk up from directory name looking for a pubspec. Return
-/// the directory that contains it, or null if none is found.
-String _packageDirectoryFor(String directoryName) {
-  var dir = directoryName;
-  while (!_pubspecFor(dir).existsSync()) {
-    var newDir = path.dirname(dir);
-    if (newDir == dir) return null;
-    dir = newDir;
-  }
-  return dir;
-}
-
-File _pubspecFor(String directoryName) =>
-    new File(path.join(directoryName, 'pubspec.yaml'));