extensions: load modules in module/__init__.py form.

For example, convert=/path/to/convert now works.

mercurial/extensions.py

@@ -5,7 +5,8 b''
 # This software may be used and distributed according to the terms
 # of the GNU General Public License, incorporated herein by reference.
 
-import imp, commands, hg, util, sys
+import imp, os
+import commands, hg, util, sys
 from i18n import _
 
 _extensions = {}
@@ -28,7 +29,12 b' def load(ui, name, path):'
         # choose an unique name so that it doesn't
         # conflicts with other modules
         module_name = "hgext_%s" % name.replace('.', '_')
-        mod = imp.load_source(module_name, path)
+        if os.path.isdir(path):
+            # module/__init__.py style
+            fd, fpath, desc = imp.find_module('', [path])
+            mod = imp.load_module(module_name, fd, fpath, desc)
+        else:
+            mod = imp.load_source(module_name, path)
     else:
         def importh(name):
             mod = __import__(name)

tests/test-extension

@@ -29,6 +29,10 b" commands.norepo += ' bar'"
 EOF
 abspath=`pwd`/foobar.py
 
+mkdir barfoo
+cp foobar.py barfoo/__init__.py
+barfoopath=`pwd`/barfoo
+
 hg init a
 cd a
 echo foo > file
@@ -43,3 +47,9 b' cd ..'
 hg clone a b
 
 hg bar
+
+echo '% module/__init__.py-style'
+echo '[extensions]' > $HGRCPATH
+echo "barfoo = $barfoopath" >> $HGRCPATH
+cd a
+hg foo

tests/test-extension.out

@@ -13,3 +13,9 b' 1 files updated, 0 files merged, 0 files'
 uisetup called
 ui.parentui is None
 Bar
+% module/__init__.py-style
+uisetup called
+ui.parentui is None
+reposetup called for a
+ui == repo.ui
+Foo