make package more lazy

docs/configuration.rst

@@ -28,7 +28,6 @@ The basic syntax for specifying CSS/JavaScript groups files is ::
               'media': 'screen,projection',
           },
       },
-      # other CSS groups goes here
   }
 
   PIPELINE_JS = {
@@ -73,14 +72,14 @@ Group options
   
   Defaults to ``None``.
 
-``manifest``
-............
+``template_name``
+.................
 
   **Optional**
-
-  Indicate if you want this group to appear in your cache manifest.
-
-  Defaults to ``True``.
+  
+  Name of the template used to render ``<script>`` for js package or ``<link>`` for css package.
+  
+  Defaults to ``None``.
 
 ``extra_context``
 .................
@@ -108,6 +107,16 @@ Group options
   Note that all filenames are specified relative to ``PIPELINE_ROOT``, and thus the source
   files needs to be in your ``PIPELINE_ROOT``.
 
+``manifest``
+............
+
+  **Optional**
+
+  Indicate if you want this group to appear in your cache manifest.
+
+  Defaults to ``True``.
+
+
 Other settings
 --------------
 

pipeline/packager.py

@@ -10,6 +10,53 @@ from pipeline.signals import css_compressed, js_compressed
 from pipeline.storage import storage
 
 
+class Package(object):
+    def __init__(self, config):
+        self.config = config
+        self._sources = []
+
+    @property
+    def sources(self):
+        if not self._sources:
+            paths = []
+            for pattern in self.config.get('source_filenames', []):
+                for path in glob(pattern):
+                    if not path in paths:
+                        paths.append(str(path))
+            self._sources = paths
+        return self._sources
+ 
+    @property
+    def paths(self):
+        return [path for path in self.sources
+            if not path.endswith(settings.PIPELINE_TEMPLATE_EXT)]
+
+    @property
+    def templates(self):
+        return [path for path in self.sources
+            if path.endswith(settings.PIPELINE_TEMPLATE_EXT)]
+
+    @property
+    def output(self):
+        return self.config.get('output_filename')
+
+    @property
+    def extra_context(self):
+        return self.config.get('extra_context', {})
+
+    @property
+    def template_name(self):
+        return self.config.get('template_name')
+
+    @property
+    def variant(self):
+        return self.config.get('variant')
+
+    @property
+    def manifest(self):
+        return self.config.get('manifest', True)
+
+
 class Packager(object):
     def __init__(self, verbose=False, css_packages=None, js_packages=None):
         self.verbose = verbose
@@ -26,7 +73,7 @@ class Packager(object):
 
     def package_for(self, kind, package_name):
         try:
-            return self.packages[kind][package_name].copy()
+            return self.packages[kind][package_name]
         except KeyError:
             raise PackageNotFound(
                 "No corresponding package for %s package name : %s" % (
@@ -51,10 +98,10 @@ class Packager(object):
         return self.compiler.compile(paths)
 
     def pack(self, package, compress, signal, **kwargs):
-        output_filename = package["output"]
+        output_filename = package.output
         if self.verbose:
             print "Saving: %s" % output_filename
-        paths = self.compile(package['paths'])
+        paths = self.compile(package.paths)
         content = compress(paths,
             asset_url=self.individual_url(output_filename), **kwargs)
         self.save_file(output_filename, content)
@@ -62,12 +109,10 @@ class Packager(object):
         return output_filename
 
     def pack_javascripts(self, package, **kwargs):
-        if 'externals' in package:
-            return
-        return self.pack(package, self.compressor.compress_js, js_compressed, templates=package['templates'], **kwargs)
+        return self.pack(package, self.compressor.compress_js, js_compressed, templates=package.templates, **kwargs)
 
     def pack_templates(self, package):
-        return self.compressor.compile_templates(package['templates'])
+        return self.compressor.compile_templates(package.templates)
 
     def save_file(self, path, content):
         return storage.save(path, ContentFile(content))
@@ -77,28 +122,7 @@ class Packager(object):
         if not config:
             return packages
         for name in config:
-            packages[name] = {}
-            paths = []
-            for pattern in config[name]['source_filenames']:
-                for path in glob(pattern):
-                    if not path in paths:
-                        paths.append(str(path))
-            packages[name]['paths'] = [path for path in paths if not path.endswith(settings.PIPELINE_TEMPLATE_EXT)]
-            packages[name]['templates'] = [path for path in paths if path.endswith(settings.PIPELINE_TEMPLATE_EXT)]
-            packages[name]['output'] = config[name]['output_filename']
-            packages[name]['context'] = {}
-            packages[name]['manifest'] = True
-            if 'absolute_asset_paths' in config[name]:
-                packages[name]['absolute_asset_paths'] = \
-                    config[name]['absolute_asset_paths']
-            if 'extra_context' in config[name]:
-                packages[name]['context'] = config[name]['extra_context']
-            if 'template_name' in config[name]:
-                packages[name]['template'] = config[name]['template_name']
-            if 'variant' in config[name]:
-                packages[name]['variant'] = config[name]['variant']
-            if 'manifest' in config[name]:
-                packages[name]['manifest'] = config[name]['manifest']
+            packages[name] = Package(config[name])
         return packages
 
 

pipeline/templatetags/compressed.py

@@ -29,24 +29,21 @@ class CompressedCSSNode(template.Node):
             return ''  # fail silently, do not return anything if an invalid group is specified
 
         if settings.PIPELINE:
-            return self.render_css(package, package["output"])
+            return self.render_css(package, package.output)
         else:
-            package['paths'] = self.packager.compile(package['paths'])
-            return self.render_individual(package)
+            paths = self.packager.compile(package.paths)
+            return self.render_individual(package, paths)
 
     def render_css(self, package, path):
-        context = {}
-        if not 'template' in package:
-            package['template'] = "pipeline/css.html"
-        if 'context' in package:
-            context = package['context']
+        template_name = package.template_name or "pipeline/css.html"
+        context = package.extra_context
         context.update({
             'url': staticfiles_storage.url(path)
         })
-        return render_to_string(package['template'], context)
+        return render_to_string(template_name, context)
 
-    def render_individual(self, package):
-        tags = [self.render_css(package, path) for path in package['paths']]
+    def render_individual(self, package, paths):
+        tags = [self.render_css(package, path) for path in paths]
         return '\n'.join(tags)
 
 
@@ -67,41 +64,29 @@ class CompressedJSNode(template.Node):
             return ''  # fail silently, do not return anything if an invalid group is specified
 
         if settings.PIPELINE:
-            return self.render_js(package, package["output"])
+            return self.render_js(package, package.output)
         else:
-            package['paths'] = self.packager.compile(package['paths'])
+            paths = self.packager.compile(package.paths)
             templates = self.packager.pack_templates(package)
-            return self.render_individual(package, templates)
+            return self.render_individual(package, paths, templates)
 
     def render_js(self, package, path):
-        context = {}
-        if not 'template' in package:
-            package['template'] = "pipeline/js.html"
-        if 'context' in package:
-            context = package['context']
+        template_name = package.template_name or "pipeline/js.html"
+        context = package.extra_context
         context.update({
             'url': staticfiles_storage.url(path)
         })
-        return render_to_string(package['template'], context)
-
-    def render_external(self, package, url):
-        if not 'template' in package:
-            package['template'] = "pipeline/js.html"
-        return render_to_string(package['template'], {
-            'url': url
-        })
+        return render_to_string(template_name, context)
 
     def render_inline(self, package, js):
-        context = {}
-        if 'context' in package:
-            context = package['context']
+        context = package.extra_context
         context.update({
             'source': js
         })
         return render_to_string("pipeline/inline_js.html", context)
 
-    def render_individual(self, package, templates=None):
-        tags = [self.render_js(package, js) for js in package['paths']]
+    def render_individual(self, package, paths, templates=None):
+        tags = [self.render_js(package, js) for js in paths]
         if templates:
             tags.append(self.render_inline(package, templates))
         return '\n'.join(tags)