extensions: simplify by selecting primary hgext

mercurial/extensions.py

@@ -134,17 +134,20 def pathdirs():
 def disabled():
     '''find disabled extensions from hgext
     returns a dict of {name: desc}, and the max name length'''
+
+    import hgext
+    extpath = os.path.dirname(os.path.abspath(hgext.__file__))
+
     exts = {}
     maxlength = 0
-    for dir in filter(os.path.isdir,
-                      (os.path.join(pd, 'hgext') for pd in pathdirs())):
-        for e in os.listdir(dir):
+    for e in os.listdir(extpath):
+
             if e.endswith('.py'):
                 name = e.rsplit('.', 1)[0]
-                path = os.path.join(dir, e)
+            path = os.path.join(extpath, e)
             else:
                 name = e
-                path = os.path.join(dir, e, '__init__.py')
+            path = os.path.join(extpath, e, '__init__.py')
 
             if name in exts or name == '__init__' or not os.path.exists(path):
                 continue
@@ -168,6 +171,7 def disabled():
                 exts[name] = gettext(doc).splitlines()[0]
             else:
                 exts[name] = _('(no help text available)')
+
             if len(name) > maxlength:
                 maxlength = len(name)