--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/piecrust/publishing/publisher.py	Thu Feb 04 08:05:03 2016 -0800
@@ -0,0 +1,75 @@
+import logging
+from piecrust.publishing.base import PublishingContext
+
+
+logger = logging.getLogger(__name__)
+
+
+class InvalidPublishTargetError(Exception):
+    pass
+
+
+class PublishingError(Exception):
+    pass
+
+
+class Publisher(object):
+    def __init__(self, app):
+        self.app = app
+
+    def run(self, target, log_file=None):
+        target_cfg = self.app.config.get('publish/%s' % target)
+        if not target_cfg:
+            raise InvalidPublishTargetError(
+                    "No such publish target: %s" % target)
+
+        target_type = target_cfg.get('type')
+        if not target_type:
+            raise InvalidPublishTargetError(
+                    "Publish target '%s' doesn't specify a type." % target)
+
+        pub = None
+        for pub_cls in self.app.plugin_loader.getPublishers():
+            if pub_cls.PUBLISHER_NAME == target_type:
+                pub = pub_cls(self.app, target)
+                break
+        if pub is None:
+            raise InvalidPublishTargetError(
+                    "Publish target '%s' has invalid type: %s" %
+                    (target, target_type))
+
+        ctx = PublishingContext()
+
+        hdlr = None
+        if log_file:
+            if not pub.is_using_custom_logging:
+                logger.debug("Adding file handler for: %s" % log_file)
+                hdlr = logging.FileHandler(log_file, mode='w', encoding='utf8')
+                logger.addHandler(hdlr)
+            else:
+                logger.debug("Creating custom log file: %s" % log_file)
+                ctx.custom_logging_file = open(
+                        log_file, mode='w', encoding='utf8')
+
+        intro_msg = ("Running publish target '%s' with publisher: %s" %
+                     (target, pub.PUBLISHER_NAME))
+        logger.debug(intro_msg)
+        if ctx.custom_logging_file:
+            ctx.custom_logging_file.write(intro_msg + "\n")
+
+        try:
+            success = pub.run(ctx)
+        except Exception as ex:
+            raise PublishingError(
+                    "Error publishing to target: %s" % target) from ex
+        finally:
+            if ctx.custom_logging_file:
+                ctx.custom_logging_file.close()
+            if hdlr:
+                logger.removeHandler(hdlr)
+                hdlr.close()
+
+        if not success:
+            raise PublishingError(
+                    "Unknown error publishing to target: %s" % target)
+