extensions: extract closure that looks for commands from disabled module

I'll rewrite this function to not load disabled extensions.

mercurial/extensions.py

@@ -655,15 +655,7 b' def disabledext(name):'
     if name in paths:
         return _disabledhelp(paths[name])
 
-def disabledcmd(ui, cmd, strict=False):
-    '''import disabled extensions until cmd is found.
-    returns (cmdname, extname, module)'''
-
-    paths = _disabledpaths(strip_init=True)
-    if not paths:
-        raise error.UnknownCommand(cmd)
-
-    def findcmd(cmd, name, path):
+def _finddisabledcmd(ui, cmd, name, path, strict):
         try:
             mod = loadpath(path, 'hgext.%s' % name)
         except Exception:
@@ -685,15 +677,23 b' def disabledcmd(ui, cmd, strict=False):'
             cmd = aliases[0]
         return (cmd, name, mod)
 
+def disabledcmd(ui, cmd, strict=False):
+    '''import disabled extensions until cmd is found.
+    returns (cmdname, extname, module)'''
+
+    paths = _disabledpaths(strip_init=True)
+    if not paths:
+        raise error.UnknownCommand(cmd)
+
     ext = None
     # first, search for an extension with the same name as the command
     path = paths.pop(cmd, None)
     if path:
-        ext = findcmd(cmd, cmd, path)
+        ext = _finddisabledcmd(ui, cmd, cmd, path, strict=strict)
     if not ext:
         # otherwise, interrogate each extension until there's a match
         for name, path in paths.iteritems():
-            ext = findcmd(cmd, name, path)
+            ext = _finddisabledcmd(ui, cmd, name, path, strict=strict)
             if ext:
                 break
     if ext: