[PATCH 1 of 3 V2 (resend)] wireproto: extract capabilities list in outside the wireproto function

[pierre-yves.david at ens-lyon.org]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1394527082 25200
#      Tue Mar 11 01:38:02 2014 -0700
# Node ID 0d064ce8b34079cb817eb265bf1827fa0aee1629
# Parent  41e1064486f96bd2761acf85e197e627346c292e
wireproto: extract capabilities list in outside the wireproto function

Before that it was over complicated to add capabilities from an extension.

This mimic was is done for capabilities in localrepo.

diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -412,13 +412,16 @@ def branches(repo, proto, nodes):
     r = []
     for b in repo.branches(nodes):
         r.append(encodelist(b) + "\n")
     return "".join(r)
 
+
+wireprotocaps = ['lookup', 'changegroupsubset', 'branchmap', 'pushkey',
+                 'known', 'getbundle', 'unbundlehash', 'batch']
 def capabilities(repo, proto):
-    caps = ('lookup changegroupsubset branchmap pushkey known getbundle '
-            'unbundlehash batch').split()
+    # copy to prevent modification of the global list
+    caps = list(wireprotocaps)
     if _allowstream(repo.ui):
         if repo.ui.configbool('server', 'preferuncompressed', False):
             caps.append('stream-preferred')
         requiredformats = repo.requirements & repo.supportedformats
         # if our local revlogs are just revlogv1, add 'stream' cap