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Side by Side Diff: packages/barback/example/markdown_converter/lib/transformer.dart

Issue 1400473008: Roll Observatory packages and add a roll script (Closed) Base URL: git@github.com:dart-lang/observatory_pub_packages.git@master
Patch Set: Created 5 years, 2 months ago
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1 // Copyright (c) 2014, 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 import 'package:barback/barback.dart';
6 import 'package:markdown/markdown.dart';
7
8 import 'dart:async';
9
10 class ConvertMarkdown extends Transformer {
11
12 // A constructor named "asPlugin" is required. It can be empty, but
13 // it must be present. It is how pub determines that you want this
14 // class to be publicly available as a loadable transformer plugin.
15 ConvertMarkdown.asPlugin();
16
17 // Any markdown file with one of the following extensions is
18 // converted to HTML.
19 String get allowedExtensions => ".md .markdown .mdown";
20
21 Future apply(Transform transform) async {
22 var content = await transform.primaryInput.readAsString();
23
24 // The extension of the output is changed to ".html".
25 var id = transform.primaryInput.id.changeExtension(".html");
26
27 var newContent =
28 "<html><body>" + markdownToHtml(content) + "</body></html>";
29 transform.addOutput(new Asset.fromString(id, newContent));
30 }
31 }
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