improve manifesto support

pipeline/manifest.py

 import os
 
+from django.conf import settings
+
 from manifesto import Manifest
 
 from pipeline.packager import Packager
@@ -8,16 +10,38 @@ from pipeline.packager import Packager
 class PipelineManifest(Manifest):
     def __init__(self):
         self.packager = Packager()
+        self.packages = self.collect_packages()
 
-    def cache(self):
-        packages, cache = [], []
+    def collect_packages(self):
+        packages = []
         for package_name in self.packager.packages['css']:
             packages.append(self.packager.package_for('css', package_name))
         for package_name in self.packager.packages['js']:
             packages.append(self.packager.package_for('js', package_name))
-        for package in packages:
-            filename_base, filename = os.path.split(package['output'])
-            version = self.packager.versioning.version_from_file(filename_base, filename)
-            output_filename = self.packager.versioning.output_filename(package['output'], version)
-            cache.append(str(self.packager.individual_url(output_filename)))
-        return cache
+        return packages
+
+    def cache(self):
+        if settings.PIPELINE:
+            for package in self.packages:
+                filename_base, filename = os.path.split(package['output'])
+                version = self.packager.versioning.version_from_file(filename_base, filename)
+                output_filename = self.packager.versioning.output_filename(package['output'], version)
+                yield str(self.packager.individual_url(output_filename))
+        else:
+            for package in self.packages:
+                for path in self.packager.compile(package['paths']):
+                    yield str(self.packager.individual_url(path))
+
+    def revision(self):
+        versions = []
+        if settings.PIPELINE:
+            for package in self.packages:
+                filename_base, filename = os.path.split(package['output'])
+                version = self.packager.versioning.version_from_file(filename_base, filename)
+                versions.append(str(version))
+        else:
+            for package in self.packages:
+                version = self.packager.versioning.version(package['paths'])
+                versions.append(str(version))
+        versions.sort()
+        return versions[-1]