From d9a76e61e75f77fbacf6ee5525f64fe2ac37184f Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@agendaless.com>
Date: Sat, 27 Jun 2009 03:35:00 +0000
Subject: - Use the ``pkg_resources`` API to locate template filenames instead 
  of dead-reckoning using the ``os.path`` module.

---
 repoze/bfg/path.py | 41 +++++++++++++++++++++++------------------
 1 file changed, 23 insertions(+), 18 deletions(-)

(limited to 'repoze/bfg/path.py')

diff --git a/repoze/bfg/path.py b/repoze/bfg/path.py
index 6fee43791..d8e90f0ff 100644
--- a/repoze/bfg/path.py
+++ b/repoze/bfg/path.py
@@ -1,27 +1,32 @@
 import os
 import sys
+import pkg_resources
 
-def caller_path(path, level=2, package_globals=None): # package_globals==testing
+def caller_path(path, level=2):
     if not os.path.isabs(path):
+        module = caller_module(level+1)
+        prefix = package_path(module)
+        path = os.path.join(prefix, path)
+    return path
 
-        if package_globals is None:
-            package_globals = sys._getframe(level).f_globals
-
-        if '__bfg_abspath__' in package_globals:
-            return os.path.join(package_globals['__bfg_abspath__'], path)
+def caller_module(level=2):
+    module_globals = sys._getframe(level).f_globals
+    module_name = module_globals['__name__']
+    module = sys.modules[module_name]
+    return module
 
-        # computing the abspath is actually kinda expensive so we
-        # memoize the result
-        package_name = package_globals['__name__']
-        package = sys.modules[package_name]
-        prefix = package_path(package)
+def package_path(package):
+    # computing the abspath is actually kinda expensive so we memoize
+    # the result
+    prefix = getattr(package, '__bfg_abspath__', None)
+    if prefix is None:
+        prefix = pkg_resources.resource_filename(package.__name__, '')
+        # pkg_resources doesn't care whether we feed it a package
+        # name or a module name within the package, the result
+        # will be the same: a directory name to the package itself
         try:
-            package_globals['__bfg_abspath__'] = prefix
+            package.__bfg_abspath__ = prefix
         except:
+            # this is only an optimization, ignore any error
             pass
-        path = os.path.join(prefix, path)
-    return path
-
-def package_path(package):
-    return os.path.abspath(os.path.dirname(package.__file__))
-
+    return prefix
-- 
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