--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/data/assetor.py	Sun Aug 10 23:43:16 2014 -0700
@@ -0,0 +1,75 @@
+import os.path
+import logging
+from piecrust.uriutil import multi_replace
+
+
+logger = logging.getLogger(__name__)
+
+
+def build_base_url(app, uri, assets_path):
+    base_url_format = app.env.base_asset_url_format
+    site_root = app.config.get('site/root')
+    rel_path = os.path.relpath(assets_path, app.root_dir)
+    pretty = app.config.get('site/pretty_urls')
+    if not pretty:
+        uri, _ = os.path.splitext(uri)
+    base_url = multi_replace(
+            base_url_format,
+            {
+                '%site_root%': site_root,
+                '%path%': rel_path,
+                '%uri%': uri})
+    return base_url.rstrip('/') + '/'
+
+
+class Assetor(object):
+    ASSET_DIR_SUFFIX = '-assets'
+
+    debug_render_doc = """Helps render URLs to files in the current page's
+                          asset folder."""
+    debug_render = []
+    debug_render_dynamic = ['_debugRenderAssetNames']
+
+    def __init__(self, page, uri):
+        self._page = page
+        self._uri = uri
+        self._cache = None
+
+    def __getattr__(self, name):
+        try:
+            self._cacheAssets()
+            return self._cache[name]
+        except KeyError:
+            raise AttributeError()
+
+    def __getitem__(self, key):
+        self._cacheAssets()
+        return self._cache[key]
+
+    def __iter__(self):
+        self._cacheAssets()
+        return self._cache.__iter__()
+
+    def iterkeys(self):
+        return self.__iter__(self)
+
+    def _debugRenderAssetNames(self):
+        self._cacheAssets()
+        return self._cache.keys()
+
+    def _cacheAssets(self):
+        if self._cache is not None:
+            return
+
+        self._cache = {}
+        name, ext = os.path.splitext(self._page.path)
+        assets_dir = name + Assetor.ASSET_DIR_SUFFIX
+        if not os.path.isdir(assets_dir):
+            return
+
+        base_url = build_base_url(self._page.app, self._uri, assets_dir)
+        for _, __, filenames in os.walk(assets_dir):
+            for fn in filenames:
+                name, ext = os.path.splitext(fn)
+                self._cache[name] = base_url + fn
+