--- a/piecrust/commands/builtin/baking.py	Tue Jan 13 21:53:22 2015 -0800
+++ b/piecrust/commands/builtin/baking.py	Wed Jan 14 22:42:26 2015 -0800
@@ -70,10 +70,13 @@
         baker.bake()
 
     def _bakeAssets(self, ctx, out_dir):
-        mounts = ctx.app.assets_dirs
         baker_params = ctx.app.config.get('baker') or {}
-        skip_patterns = baker_params.get('skip_patterns')
-        force_patterns = baker_params.get('force_patterns')
+        mounts = (baker_params.get('assets_dirs') or
+                  ctx.app.assets_dirs)
+        skip_patterns = (baker_params.get('ignore') or
+                         baker_params.get('skip_patterns'))
+        force_patterns = (baker_params.get('force') or
+                          baker_params.get('force_patterns'))
         num_workers = ctx.app.config.get('baker/workers') or 4
         proc = ProcessorPipeline(
                 ctx.app, mounts, out_dir,

--- a/piecrust/processing/base.py	Tue Jan 13 21:53:22 2015 -0800
+++ b/piecrust/processing/base.py	Wed Jan 14 22:42:26 2015 -0800
@@ -102,8 +102,9 @@
 
 
 class ProcessingContext(object):
-    def __init__(self, base_dir, job_queue, record=None):
+    def __init__(self, base_dir, mount_info, job_queue, record=None):
         self.base_dir = base_dir
+        self.mount_info = mount_info
         self.job_queue = job_queue
         self.record = record
 
@@ -126,6 +127,8 @@
         self.processors = app.plugin_loader.getProcessors()
         self.num_workers = num_workers
 
+        self.mounts = make_mount_info(self.mounts)
+
         self.skip_patterns += ['_cache', '_counter',
                 'theme_info.yml',
                 '.DS_Store', 'Thumbs.db',
@@ -138,7 +141,12 @@
         self.skip_patterns += make_re(patterns)
 
     def filterProcessors(self, authorized_names):
-        self.processors = list(filter(
+        if not authorized_names or authorized_names == '*':
+            return self.processors
+
+        if isinstance(authorized_names, str):
+            authorized_names = authorized_names.split(',')
+        return list(filter(
             lambda p: p.PROCESSOR_NAME in authorized_names,
             self.processors))
 
@@ -184,16 +192,17 @@
         if src_dir_or_file is not None:
             # Process only the given path.
             # Find out what mount point this is in.
-            for path in self.mounts:
+            for path, info in self.mounts.items():
                 if src_dir_or_file[:len(path)] == path:
                     base_dir = path
+                    mount_info = info
                     break
             else:
                 raise Exception("Input path '%s' is not part of any known "
                                 "mount point: %s" %
-                                (src_dir_or_file, self.mounts))
+                                (src_dir_or_file, self.mounts.keys()))
 
-            ctx = ProcessingContext(base_dir, queue, record)
+            ctx = ProcessingContext(base_dir, mount_info, queue, record)
             logger.debug("Initiating processing pipeline on: %s" % src_dir_or_file)
             if os.path.isdir(src_dir_or_file):
                 self.processDirectory(ctx, src_dir_or_file, new_only)
@@ -202,8 +211,8 @@
 
         else:
             # Process everything.
-            for path in self.mounts:
-                ctx = ProcessingContext(path, queue, record)
+            for path, info in self.mounts.items():
+                ctx = ProcessingContext(path, info, queue, record)
                 logger.debug("Initiating processing pipeline on: %s" % path)
                 self.processDirectory(ctx, path, new_only)
 
@@ -251,7 +260,7 @@
 
     def processFile(self, ctx, path, new_only=False):
         logger.debug("Queuing: %s" % path)
-        job = ProcessingWorkerJob(ctx.base_dir, path, new_only)
+        job = ProcessingWorkerJob(ctx.base_dir, ctx.mount_info, path, new_only)
         ctx.job_queue.put_nowait(job)
 
 
@@ -266,8 +275,9 @@
 
 
 class ProcessingWorkerJob(object):
-    def __init__(self, base_dir, path, new_only=False):
+    def __init__(self, base_dir, mount_info, path, new_only=False):
         self.base_dir = base_dir
+        self.mount_info = mount_info
         self.path = path
         self.new_only = new_only
 
@@ -318,8 +328,9 @@
                     '%s [not baked, overridden]' % rel_path))
             return
 
+        processors = pipeline.filterProcessors(job.mount_info['processors'])
         try:
-            builder = ProcessingTreeBuilder(pipeline.processors)
+            builder = ProcessingTreeBuilder(processors)
             tree_root = builder.build(rel_path)
         except ProcessingTreeError as ex:
             record_entry.errors.append(str(ex))
@@ -353,6 +364,19 @@
             logger.error("Error processing %s: %s" % (rel_path, ex))
 
 
+def make_mount_info(mounts):
+    if isinstance(mounts, list):
+        mounts = {m: {} for m in mounts}
+
+    for name, info in mounts.items():
+        if not isinstance(info, dict):
+            raise Exception("Asset directory info for '%s' is not a "
+                            "dictionary." % name)
+        info.setdefault('processors', '*')
+
+    return mounts
+
+
 def make_re(patterns):
     re_patterns = []
     for pat in patterns: