From 3c9613061499de48d65714d11fe97b19475fb97d Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@agendaless.com>
Date: Sat, 27 Jun 2009 06:17:35 +0000
Subject: - The ``repoze.bfg.templating`` module now uses ``pkg_resources`` to 
  locate and register template files instead of using an absolute   path name.

---
 repoze/bfg/templating.py | 43 +++++++++++++++++++++++++++++--------------
 1 file changed, 29 insertions(+), 14 deletions(-)

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

diff --git a/repoze/bfg/templating.py b/repoze/bfg/templating.py
index ce2833415..337621eef 100644
--- a/repoze/bfg/templating.py
+++ b/repoze/bfg/templating.py
@@ -1,24 +1,39 @@
+import pkg_resources
 from zope.component import queryUtility
 from repoze.bfg.interfaces import ITemplateRenderer
 from zope.component import getSiteManager
-from repoze.bfg.path import caller_path
+from repoze.bfg.path import caller_module
 import os
 
 def renderer_from_cache(path, factory, level=3, **kw):
-    abspath = caller_path(path, level=level)
-    renderer = queryUtility(ITemplateRenderer, abspath)
+    if os.path.isabs(path):
+        # 'path' is an absolute filename (not common and largely only
+        # for backwards compatibility)
+        if not os.path.exists(path):
+            raise ValueError('Missing template file: %s' % path)
+        renderer = queryUtility(ITemplateRenderer, name=path)
+        if renderer is None:
+            renderer = factory(path, **kw)
+            sm = getSiteManager()
+            sm.registerUtility(renderer, ITemplateRenderer, name=path)
 
-    if renderer is None:
-        # service unit tests and explicit registrations by trying the relative
-        # "path"
-        renderer = queryUtility(ITemplateRenderer, path)
-
-    if renderer is None:
-        if not os.path.exists(abspath):
-            raise ValueError('Missing template file: %s' % abspath)
-        renderer = factory(abspath, **kw)
-        sm = getSiteManager()
-        sm.registerUtility(renderer, ITemplateRenderer, name=abspath)
+    else:
+        # 'path' is a relative filename
+        module = caller_module(level=level)
+        spec = (module.__name__, path) 
+        utility_name = '%s\t%s' % spec # utility name must be a string :-(
+        renderer = queryUtility(ITemplateRenderer, name=utility_name)
+        if renderer is None:
+            # service unit tests here by trying the relative path
+            # string as the utility name directly
+            renderer = queryUtility(ITemplateRenderer, name=path)
+        if renderer is None:
+            if not pkg_resources.resource_exists(*spec):
+                raise ValueError('Missing template resource: %s:%s' % spec)
+            abspath = pkg_resources.resource_filename(*spec)
+            renderer = factory(abspath, **kw)
+            sm = getSiteManager()
+            sm.registerUtility(renderer, ITemplateRenderer, name=utility_name)
         
     return renderer
 
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