# HG changeset patch
# User Ludovic Chabant <ludovic@chabant.com>
# Date 1413472742 25200
# Node ID 7f00176a3b4d77b7fb9c4db75828dad2f03f9ed9
# Parent  438509f1233278445576c4f0178cc1989573fdf7
Prepare the server to support background asset pipelines.

diff -r 438509f12332 -r 7f00176a3b4d piecrust/serving.py
--- a/piecrust/serving.py	Wed Oct 15 23:02:21 2014 -0700
+++ b/piecrust/serving.py	Thu Oct 16 08:19:02 2014 -0700
@@ -26,12 +26,14 @@
 
 class Server(object):
     def __init__(self, root_dir, host='localhost', port='8080',
-                 debug=False, static_preview=True):
+                 debug=False, static_preview=True,
+                 synchronous_asset_pipeline=True):
         self.root_dir = root_dir
         self.host = host
         self.port = port
         self.debug = debug
         self.static_preview = static_preview
+        self.synchronous_asset_pipeline = synchronous_asset_pipeline
         self._out_dir = None
         self._skip_patterns = None
         self._force_patterns = None
@@ -119,11 +121,13 @@
         mounts = app.assets_dirs
         asset_in_path = entry.path
         asset_out_path = os.path.join(self._out_dir, rel_req_path)
-        pipeline = ProcessorPipeline(
-                app, mounts, self._out_dir,
-                skip_patterns=self._skip_patterns,
-                force_patterns=self._force_patterns)
-        pipeline.run(asset_in_path)
+
+        if self.synchronous_asset_pipeline:
+            pipeline = ProcessorPipeline(
+                    app, mounts, self._out_dir,
+                    skip_patterns=self._skip_patterns,
+                    force_patterns=self._force_patterns)
+            pipeline.run(asset_in_path)
 
         logger.debug("Serving %s" % asset_out_path)
         wrapper = wrap_file(environ, open(asset_out_path, 'rb'))