Add support for extensions to declare their version as a string returned from setup().

CHANGES

@@ -26,6 +26,9 @@ Features added
 * Add support for docutils 0.12
 * Added ``sphinx.ext.napoleon`` extension for NumPy and Google style docstring
   support.
+* Added support for extension versions (a string returned by ``setup()``, these
+  can be shown in the traceback log files).  In the future this might also be
+  used for version checking.
 * PR#214: Added stemming support for 14 languages, so that the built-in document
   search can now handle these.  Thanks to Shibukawa Yoshiki.
 * PR#202: Allow "." and "~" prefixed references in ``:param:`` doc fields

doc/extdev/index.rst

@@ -18,6 +18,11 @@ imports this module and executes its ``setup()`` function, which in turn
 notifies Sphinx of everything the extension offers -- see the extension tutorial
 for examples.
 
+.. versionadded:: 1.3
+   The ``setup()`` function can return a string, this is treated by Sphinx as
+   the version of the extension and used for informational purposes such as the
+   traceback file when an exception occurs.
+
 The configuration file itself can be treated as an extension if it contains a
 ``setup()`` function.  All other extensions to load must be listed in the
 :confval:`extensions` configuration value.

doc/extdev/tutorial.rst

@@ -162,6 +162,8 @@ new Python module called :file:`todo.py` and add the setup function::
        app.connect('doctree-resolved', process_todo_nodes)
        app.connect('env-purge-doc', purge_todos)
 
+       return '0.1'   # identifies the version of our extension
+
 The calls in this function refer to classes and functions not yet written.  What
 the individual calls do is the following:
 

sphinx/application.py

@@ -71,6 +71,7 @@ class Sphinx(object):
         self.verbosity = verbosity
         self.next_listener_id = 0
         self._extensions = {}
+        self._extension_versions = {}
         self._listeners = {}
         self.domains = BUILTIN_DOMAINS.copy()
         self.builderclasses = BUILTIN_BUILDERS.copy()
@@ -345,16 +346,20 @@ class Sphinx(object):
         if not hasattr(mod, 'setup'):
             self.warn('extension %r has no setup() function; is it really '
                       'a Sphinx extension module?' % extension)
+            version = None
         else:
             try:
-                mod.setup(self)
+                version = mod.setup(self)
             except VersionRequirementError as err:
                 # add the extension name to the version required
                 raise VersionRequirementError(
                     'The %s extension used by this project needs at least '
                     'Sphinx v%s; it therefore cannot be built with this '
                     'version.' % (extension, err))
+        if version is None:
+            version = 'unknown version'
         self._extensions[extension] = mod
+        self._extension_versions[extension] = version
 
     def require_sphinx(self, version):
         # check the Sphinx version if requested

sphinx/util/__init__.py

@@ -191,8 +191,9 @@ def save_traceback(app):
                    jinja2.__version__)).encode('utf-8'))
     if app is not None:
         for extname, extmod in iteritems(app._extensions):
-            os.write(fd, ('#   %s from %s\n' % (
-                extname, getattr(extmod, '__file__', 'unknown'))
+            os.write(fd, ('#   %s (%s) from %s\n' % (
+                extname, app._extension_versions[extname],
+                getattr(extmod, '__file__', 'unknown'))
                 ).encode('utf-8'))
     os.write(fd, exc.encode('utf-8'))
     os.close(fd)