User friendlier YAML formatting for pubspec.lock

utils/pub/lock_file.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.
 
 #library('lock_file');
 
 #import('dart:json');
 #import('package.dart');
 #import('source_registry.dart');
 #import('utils.dart');
@@ skipping 75 matching lines @@
     packages.forEach((name, id) {
       packagesObj[name] = {
         'version': id.version.toString(),
         'source': id.source.name,
         'description': id.description
       };
     });
 
     // TODO(nweiz): Serialize using the YAML library once it supports
     // serialization. For now, we use JSON, since it's a subset of YAML anyway.
-    return JSON.stringify({'packages': packagesObj});
+    //
+    // (prujohn@gmail.com) remove the _stringifyPretty() wrapper once the
+    // YAML impl ready.
+    return _stringifyPretty(packagesObj);
+    // return JSON.stringify({'packages' : packagesObj});
+  }
+
+  /**
+   * Provides a stringify on [packagesObj] to make the lock file more
+   * human-readable.
+   */
+  String _stringifyPretty(Map<String, Map> packagesObj){
+    final sb = new StringBuffer();
+
+    sb.add('packages:\n');
+    packagesObj.forEach((name, map){
+      sb.add('  ${name}:\n');
+      map.forEach((key, value){
+        if (key == "description" && value is Map){
+          sb.add('    description:\n');
+          value.forEach((dkey, dvalue){
+            sb.add('      ${dkey}: $dvalue\n');
+          });
+        }else{
+          sb.add('    ${key}: $value\n');
+        }
+      });
+    });
+    return sb.toString();
   }
 }