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Side by Side Diff: pkg/polymer/lib/src/build/index_page_builder.dart

Issue 573863003: simple index.html files for folders that contain entry points (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: remove unused import Created 6 years, 3 months ago
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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
2 // for details. All rights reserved. Use of this source code is governed by a
3 // BSD-style license that can be found in the LICENSE file.
4
5 /// Builds an index.html file in each folder containing entry points, if none
6 /// already exists. This file simply lists all the entry point files.
7 library polymer.src.build.index_page_builder;
8
9 import 'dart:async';
10 import 'dart:math';
11
12 import 'package:barback/barback.dart';
13 import 'package:path/path.dart' as path;
14
15 import 'common.dart';
16
17 /// Builds an index.html file in each folder containing entry points, if none
18 /// already exists. This file simply lists all the entry point files.
19 class IndexPageBuilder extends AggregateTransformer {
20 final TransformOptions options;
21
22 IndexPageBuilder(this.options);
23
24 classifyPrimary(AssetId id) {
25 if (!options.isHtmlEntryPoint(id)) return null;
26 // Group all entry points together.
27 return 'all_entry_points';
28 }
29
30 Future apply(AggregateTransform transform) {
31 Map<String, List<String>> dirFilesMap = {};
32
33 return transform.primaryInputs.toList().then((assets) {
34 // Add the asset to its directory, and make sure its directory is included
35 // in all its parents.
36 for (var asset in assets) {
37 var dir = path.url.dirname(asset.id.path);
38 while (dir != '.') {
39 dirFilesMap.putIfAbsent(dir, () => []);
40
41 var relativePath = path.url.relative(asset.id.path, from: dir);
42 var relativeDir = path.url.dirname(relativePath);
43 dirFilesMap[dir].add(relativePath);
44 dir = path.url.dirname(dir);
45 }
46 }
47
48 // Create an output index.html file for each directory, if one doesn't
49 // exist already
50 var futures = [];
51 dirFilesMap.forEach((directory, files) {
52 futures.add(_createOutput(directory, files, transform));
53 });
54 return Future.wait(futures);
55 });
56 }
57
58 Future _createOutput(
59 String directory, List<String> files, AggregateTransform transform) {
60 var indexAsset = new AssetId(
61 transform.package, path.join(directory, 'index.html'));
62
63 return transform.hasInput(indexAsset).then((exists) {
64 // Don't overwrite existing outputs!
65 if (exists) return;
66
67 // Sort alphabetically by recursive path parts.
68 files.sort((String a, String b) {
69 var aParts = path.split(a);
70 var bParts = path.split(b);
71 int diff = 0;
72 int minLength = min(aParts.length, bParts.length);
73 for (int i = 0; i < minLength; i++) {
74 // Directories are sorted below files.
75 var aIsDir = i < aParts.length - 1;
76 var bIsDir = i < bParts.length - 1;
77 if (aIsDir && !bIsDir) return 1;
78 if (!aIsDir && bIsDir) return -1;
79
80 // Raw string comparison, if not identical we return.
81 diff = aParts[i].compareTo(bParts[i]);
82 if (diff != 0) return diff;
83 }
84 // Identical files, shouldn't happen in practice.
85 return 0;
86 });
87
88 // Create the document with a list.
89 var doc = new StringBuffer(
90 '<!DOCTYPE html><html><body><h1>Entry points</h1><ul>');
91
92 // Add all the assets to the list.
93 for (var file in files) {
94 doc.write('<li><a href="$file">$file</a></li>');
95 };
96
97 doc.write('</ul></body></html>');
98
99 // Output the index.html file
100 transform.addOutput(new Asset.fromString(indexAsset , doc.toString()));
101 });
102 }
103
104 }
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