[PATCH 2 of 7] bundle2: support for bundling parameter value

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

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at fb.com>
# Date 1395183906 25200
#      Tue Mar 18 16:05:06 2014 -0700
# Node ID fabb16544076272f78e918f7ba026f31b955fee2
# Parent  87d3a675a99914ba3371debbdd5de6a96c58523a
bundle2: support for bundling parameter value

Parameter can now have a value. We use a `<name>=<value>` form inspired from
capabilities.

There is still no kind of escaping in the name or value, yet.

diff --git a/mercurial/bundle2.py b/mercurial/bundle2.py
--- a/mercurial/bundle2.py
+++ b/mercurial/bundle2.py
@@ -40,13 +40,12 @@ Binary format is as follow
 :params value: arbitrary number of Bytes
 
   A blob of `params size` containing the serialized version of all stream level
   parameters.
 
-  The blob contains a space separated list of parameters.
-
-  Parameter value are not supported yet.
+  The blob contains a space separated list of parameters. parameter with value
+  are stored in the form `<name>=<value>`.
 
   Special character in param name are not supported yet.
 
   Stream parameters use a simple textual format for two main reasons:
 
@@ -114,15 +113,15 @@ class bundle20(object):
         yield '\0\0'
 
     def _paramchunk(self):
         """return a encoded version of all stream parameters"""
         blocks = []
-        for key, value in self._params:
-            # XXX no support for value yet
-            assert value is None
+        for par, value in self._params:
             # XXX no escaping yet
-            blocks.append(key)
+            if value is not None:
+                par = '%s=%s' % (par, value)
+            blocks.append(par)
         return ' '.join(blocks)
 
 class unbundle20(object):
     """interpret a bundle2 stream
 
diff --git a/tests/test-bundle2.t b/tests/test-bundle2.t
--- a/tests/test-bundle2.t
+++ b/tests/test-bundle2.t
@@ -19,11 +19,13 @@ Create an extension to test bundle2 API
   >          '')
   > def cmdbundle2(ui, repo, **opts):
   >     """write a bundle2 container on standard ouput"""
   >     bundler = bundle2.bundle20()
   >     for p in opts['param']:
-  >         bundler.addparam(p)
+  >         p = p.split('=', 1)
+  >         bundler.addparam(*p)
+  > 
   >     for chunk in bundler.getchunks():
   >         ui.write(chunk)
   > 
   > @command('unbundle2', [], '')
   > def cmdunbundle2(ui, repo):
@@ -108,5 +110,13 @@ Test unbundling
   options count: 2
   - caution
   - meal
   parts count:   0
 
+advisory parameters, with value
+-------------------------------
+
+Test generation
+
+  $ hg bundle2 --param 'caution' --param 'meal=vegan' --param 'elephants'
+  HG20\x00\x1ccaution meal=vegan elephants\x00\x00 (no-eol) (esc)
+