1 files changed, 26 insertions, 0 deletions
diff --git a/paste/util/findpackage.py b/paste/util/findpackage.py
new file mode 100644
index 0000000..9d653e5
--- /dev/null
+++ b/paste/util/findpackage.py
@@ -0,0 +1,26 @@
+# (c) 2005 Ian Bicking and contributors; written for Paste (http://pythonpaste.org)
+# Licensed under the MIT license: http://www.opensource.org/licenses/mit-license.php
+
+import sys
+import os
+
+def find_package(dir):
+    """
+    Given a directory, finds the equivalent package name.  If it
+    is directly in sys.path, returns ''.
+    """
+    dir = os.path.abspath(dir)
+    orig_dir = dir
+    path = map(os.path.abspath, sys.path)
+    packages = []
+    last_dir = None
+    while 1:
+        if dir in path:
+            return '.'.join(packages)
+        packages.insert(0, os.path.basename(dir))
+        dir = os.path.dirname(dir)
+        if last_dir == dir:
+            raise ValueError(
+                "%s is not under any path found in sys.path" % orig_dir)
+        last_dir = dir
+