1 files changed, 22 insertions, 0 deletions
diff --git a/paste/util/findpackage.py b/paste/util/findpackage.py
new file mode 100644
index 0000000..276e216
--- /dev/null
+++ b/paste/util/findpackage.py
@@ -0,0 +1,22 @@
+import sys
+import os
+
+def find_package(dir):
+    """
+    Given a directory, finds the equivalent package name.  If it
+    is directly in sys.path, returns ''.
+    """
+    orig_dir = dir
+    path = 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
+