Refactor how projects parse remotes so it can be replaced

We now feed Project a RemoteSpec, instead of the Remote directly
from the XmlManifest.  This way the RemoteSpec already has the
full project URL, rather than just the base, permitting other
types of manifests to produce the URL in their own style.

Signed-off-by: Shawn O. Pearce <sop@google.com>
diff --git a/manifest_xml.py b/manifest_xml.py
index 4697653..5c5617a 100644
--- a/manifest_xml.py
+++ b/manifest_xml.py
@@ -18,8 +18,7 @@
 import xml.dom.minidom
 
 from git_config import GitConfig, IsId
-from project import Project, MetaProject, R_HEADS, HEAD
-from remote import Remote
+from project import RemoteSpec, Project, MetaProject, R_HEADS, HEAD
 from error import ManifestParseError
 
 MANIFEST_FILE_NAME = 'manifest.xml'
@@ -31,6 +30,21 @@
   revision = None
   remote = None
 
+class _XmlRemote(object):
+  def __init__(self,
+               name,
+               fetch=None,
+               review=None):
+    self.name = name
+    self.fetchUrl = fetch
+    self.reviewUrl = review
+
+  def ToRemoteSpec(self, projectName):
+    url = self.fetchUrl
+    while url.endswith('/'):
+      url = url[:-1]
+    url += '/%s.git' % projectName
+    return RemoteSpec(self.name, url, self.reviewUrl)
 
 class XmlManifest(object):
   """manages the repo configuration file"""
@@ -257,7 +271,7 @@
 
     if name is None:
       s = m_url.rindex('/') + 1
-      remote = Remote('origin', fetch = m_url[:s])
+      remote = _XmlRemote('origin', m_url[:s])
       name = m_url[s:]
 
     if name.endswith('.git'):
@@ -268,7 +282,7 @@
       gitdir = os.path.join(self.topdir, '%s.git' % name)
       project = Project(manifest = self,
                         name = name,
-                        remote = remote,
+                        remote = remote.ToRemoteSpec(name),
                         gitdir = gitdir,
                         worktree = None,
                         relpath = None,
@@ -284,7 +298,7 @@
     review = node.getAttribute('review')
     if review == '':
       review = None
-    return Remote(name=name, fetch=fetch, review=review)
+    return _XmlRemote(name, fetch, review)
 
   def _ParseDefault(self, node):
     """
@@ -337,7 +351,7 @@
 
     project = Project(manifest = self,
                       name = name,
-                      remote = remote,
+                      remote = remote.ToRemoteSpec(name),
                       gitdir = gitdir,
                       worktree = worktree,
                       relpath = path,