Index: utils/pub/system_cache.dart |
diff --git a/utils/pub/system_cache.dart b/utils/pub/system_cache.dart |
index 1e26554cd72a177088c1a83779d6940b07e50b1d..634dc173257b0e9742a549f86e6903fae9b855be 100644 |
--- a/utils/pub/system_cache.dart |
+++ b/utils/pub/system_cache.dart |
@@ -13,6 +13,7 @@ import 'io.dart'; |
import 'io.dart' as io show createTempDir; |
import 'log.dart' as log; |
import 'package.dart'; |
+import 'pubspec.dart'; |
import 'sdk_source.dart'; |
import 'source.dart'; |
import 'source_registry.dart'; |
@@ -59,6 +60,26 @@ class SystemCache { |
sources.register(source); |
} |
+ /// Gets the package identified by [id]. If the package is already cached, |
+ /// reads it from the cache. Otherwise, requests it from the source. |
+ Future<Package> describe(PackageId id) { |
+ Future<Package> getUncached() { |
+ // Not cached, so get it from the source. |
+ return id.describe().then((pubspec) => new Package.inMemory(pubspec)); |
+ } |
+ |
+ // Try to get it from the system cache first. |
+ if (id.source.shouldCache) { |
+ return id.systemCacheDirectory.then((packageDir) { |
+ if (!dirExistsSync(packageDir)) return getUncached(); |
+ return Package.load(id.name, packageDir, sources); |
+ }); |
+ } |
+ |
+ // Not cached, so get it from the source. |
+ return getUncached(); |
+ } |
+ |
/// Ensures that the package identified by [id] is installed to the cache, |
/// loads it, and returns it. |
/// |