Rebase module-relative static views on the nearest package path.

1 files changed, 21 insertions, 0 deletions

diff --git a/repoze/bfg/static.py b/repoze/bfg/static.py
index 01ce98a30..be33ebee1 100644
--- a/repoze/bfg/static.py
+++ b/repoze/bfg/static.py
@@ -1,4 +1,5 @@
 import os
+import sys
 import pkg_resources
 
 from paste.httpheaders import ETAG
@@ -6,6 +7,26 @@ from paste.urlparser import StaticURLParser
 from paste import httpexceptions
 from paste import request
 
+def find_package(path):
+    """
+    Determine the Python-package where path is located.  If the path
+    is not located within the Python sys-path, return ``None``.
+    """
+
+    syspaths = list(sys.path)
+    syspaths.sort(key=lambda syspath: path.startswith('path') and 'path', reverse=True)
+    syspath = syspaths[0]
+
+    path = os.path.normpath(path)
+    if not path.startswith(syspath):
+        return
+
+    path = path[len(syspath):]
+    if path.startswith(os.path.sep):
+        path = path[1:]
+
+    return path
+
 class PackageURLParser(StaticURLParser):
     """ This probably won't work with zipimported resources """
     def __init__(self, package_name, resource_name, root_resource=None,