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Unified 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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Index: packages/barback/example/markdown_converter/lib/transformer.dart
diff --git a/packages/barback/example/markdown_converter/lib/transformer.dart b/packages/barback/example/markdown_converter/lib/transformer.dart
new file mode 100644
index 0000000000000000000000000000000000000000..dcbdd8c48e5dc079209283416cec8a5496d005f4
--- /dev/null
+++ b/packages/barback/example/markdown_converter/lib/transformer.dart
@@ -0,0 +1,31 @@
+// 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.
+
+import 'package:barback/barback.dart';
+import 'package:markdown/markdown.dart';
+
+import 'dart:async';
+
+class ConvertMarkdown extends Transformer {
+
+ // A constructor named "asPlugin" is required. It can be empty, but
+ // it must be present. It is how pub determines that you want this
+ // class to be publicly available as a loadable transformer plugin.
+ ConvertMarkdown.asPlugin();
+
+ // Any markdown file with one of the following extensions is
+ // converted to HTML.
+ String get allowedExtensions => ".md .markdown .mdown";
+
+ Future apply(Transform transform) async {
+ var content = await transform.primaryInput.readAsString();
+
+ // The extension of the output is changed to ".html".
+ var id = transform.primaryInput.id.changeExtension(".html");
+
+ var newContent =
+ "<html><body>" + markdownToHtml(content) + "</body></html>";
+ transform.addOutput(new Asset.fromString(id, newContent));
+ }
+}
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