[PATCH 3 of 4] branch closing: Hide closed branches from "branches" output

[John Mulligan]

# HG changeset patch
# User John Mulligan <phlogistonjohn at asynchrono.us>
# Date 1228956314 18000
# Node ID 60bebc4475e3e1c3e51d286c226cb0d574a3b89c
# Parent  78f9336fe34f3e7920ff1414ca8457a2069686c8
branch closing: Hide closed branches from "branches" output

Remove the closed branches from the output of hg branches
and disallows using the branch name in 'hg co'.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -388,10 +388,19 @@
         # this private cache holds all heads (not just tips)
         self._ubranchcache = partial
 
+        def openhead(v):
+            head = None
+            for h in v:
+                if not self.changelog.read(h)[5].get('close'):
+                    head = h
+            return head
+
         # the branch cache is stored on disk as UTF-8, but in the local
         # charset internally
         for k, v in partial.items():
-            self.branchcache[util.tolocal(k)] = v[-1]
+            head = openhead(v)
+            if head:
+                self.branchcache[util.tolocal(k)] = head
         return self.branchcache
 
     def _readbranchcache(self):
@@ -1176,8 +1185,11 @@
 
     def heads(self, start=None):
         heads = self.changelog.heads(start)
+        def isclosed(head):
+            extras = self.changelog.read(head)[5]
+            return bool(extras.get('close'))
         # sort the output in rev descending order
-        heads = [(-self.changelog.rev(h), h) for h in heads]
+        heads = [(-self.changelog.rev(h), h) for h in heads if not isclosed(h)]
         return [n for (r, n) in util.sort(heads)]
 
     def branchheads(self, branch=None, start=None):