pushkey: introduce an ``encodekeys`` function

This function provides a standardized way to exchange pushkey content over
the wire.

mercurial/pushkey.py

@@ -1,39 +1,43
 # pushkey.py - dispatching for pushing and pulling keys
 #
 # Copyright 2010 Matt Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import bookmarks, phases, obsolete
+import bookmarks, phases, obsolete, encoding
 
 def _nslist(repo):
     n = {}
     for k in _namespaces:
         n[k] = ""
     if not obsolete._enabled:
         n.pop('obsolete')
     return n
 
 _namespaces = {"namespaces": (lambda *x: False, _nslist),
                "bookmarks": (bookmarks.pushbookmark, bookmarks.listbookmarks),
                "phases": (phases.pushphase, phases.listphases),
                "obsolete": (obsolete.pushmarker, obsolete.listmarkers),
               }
 
 def register(namespace, pushkey, listkeys):
     _namespaces[namespace] = (pushkey, listkeys)
 
 def _get(namespace):
     return _namespaces.get(namespace, (lambda *x: False, lambda *x: {}))
 
 def push(repo, namespace, key, old, new):
     '''should succeed iff value was old'''
     pk = _get(namespace)[0]
     return pk(repo, key, old, new)
 
 def list(repo, namespace):
     '''return a dict'''
     lk = _get(namespace)[1]
     return lk(repo)
 
+def encodekeys(keys):
+    """encode the content of a pushkey namespace for exchange over the wire"""
+    enc = encoding.fromlocal
+    return '\n'.join(['%s\t%s' % (enc(k), enc(v)) for k, v in keys])