Get codebase ready for actually supporting versioning.

utils/pub/source.dart

Index: utils/pub/source.dart
diff --git a/utils/pub/source.dart b/utils/pub/source.dart
index da01f1214930d47b5c335afc66334e182f770407..1b637b2baa934ef7519a4525ec045056d8334207 100644
--- a/utils/pub/source.dart
+++ b/utils/pub/source.dart
@@ -41,15 +41,12 @@ class Source {
   abstract Future<bool> install(PackageId id, String path);
 
   /**
-   * Returns the name of the package identified by [id]. By default, this is
-   * just `id.fullName`, but some sources (e.g. Git) may have more complicated
-   * resolution logic.
-   *
-   * This method should be light-weight. It doesn't need to validate that the
-   * given package exists.
+   * Returns a human-friendly name for the package identified by [id]. This
+   * method should be light-weight. It doesn't need to validate that the given
+   * package exists.
    *
    * The package name should be lower-case and suitable for use in a filename.
    * It may contain forward slashes.
    */
-  String packageName(PackageId id) => id.fullName;
+  abstract String packageName(PackageId id);

[nweiz, 2012/05/18 00:08:24]

I feel like id.description is still a good default for this.

[Bob Nystrom, 2012/05/18 20:02:38]

Done.

 }