# HG changeset patch
# User Matt Mackall <mpm@selenic.com>
# Date 1173829802 18000
# Node ID 7e1c8a565a4f019d7c953c6e85e0b8e92af44623
# Parent  0b48e3985765472edf3f69e4e728dcb91b41670b
Move branch read/write to dirstate where it belongs

diff -r 0b48e3985765 -r 7e1c8a565a4f mercurial/commands.py
--- a/mercurial/commands.py	Tue Mar 13 15:47:55 2007 -0500
+++ b/mercurial/commands.py	Tue Mar 13 18:50:02 2007 -0500
@@ -255,12 +255,10 @@
     current branch name.
     """
 
-    if label is not None:
-        repo.opener("branch", "w").write(util.fromlocal(label) + '\n')
+    if label:
+        repo.dirstate.setbranch(util.fromlocal(label))
     else:
-        b = util.tolocal(repo.workingctx().branch())
-        if b:
-            ui.write("%s\n" % b)
+        ui.write("%s\n" % util.tolocal(repo.dirstate.branch()))
 
 def branches(ui, repo):
     """list repository named branches
diff -r 0b48e3985765 -r 7e1c8a565a4f mercurial/context.py
--- a/mercurial/context.py	Tue Mar 13 15:47:55 2007 -0500
+++ b/mercurial/context.py	Tue Mar 13 18:50:02 2007 -0500
@@ -411,11 +411,7 @@
     def deleted(self): return self._status[3]
     def unknown(self): return self._status[4]
     def clean(self): return self._status[5]
-    def branch(self):
-        try:
-            return self._repo.opener("branch").read().strip() or "default"
-        except IOError:
-            return "default"
+    def branch(self): return self._repo.dirstate.branch()
 
     def parents(self):
         """return contexts for each parent changeset"""
diff -r 0b48e3985765 -r 7e1c8a565a4f mercurial/dirstate.py
--- a/mercurial/dirstate.py	Tue Mar 13 15:47:55 2007 -0500
+++ b/mercurial/dirstate.py	Tue Mar 13 18:50:02 2007 -0500
@@ -25,6 +25,7 @@
         self.dirs = None
         self.copymap = {}
         self.ignorefunc = None
+        self._branch = None
 
     def wjoin(self, f):
         return os.path.join(self.root, f)
@@ -137,6 +138,15 @@
         self.lazyread()
         return self.pl
 
+    def branch(self):
+        if not self._branch:
+            try:
+                self._branch = self.opener("branch").read().strip()\
+                               or "default"
+            except IOError:
+                self._branch = "default"
+        return self._branch
+
     def markdirty(self):
         if not self.dirty:
             self.dirty = 1
@@ -146,6 +156,10 @@
         self.markdirty()
         self.pl = p1, p2
 
+    def setbranch(self, branch):
+        self._branch = branch
+        self.opener("branch", "w").write(branch + '\n')
+
     def state(self, key):
         try:
             return self[key][0]
diff -r 0b48e3985765 -r 7e1c8a565a4f mercurial/merge.py
--- a/mercurial/merge.py	Tue Mar 13 15:47:55 2007 -0500
+++ b/mercurial/merge.py	Tue Mar 13 18:50:02 2007 -0500
@@ -488,9 +488,9 @@
     if not partial:
         recordupdates(repo, action, branchmerge)
         repo.dirstate.setparents(fp1, fp2)
+        if not branchmerge:
+            repo.dirstate.setbranch(p2.branch())
         repo.hook('update', parent1=xp1, parent2=xp2, error=stats[3])
-        if not branchmerge:
-            repo.opener("branch", "w").write(p2.branch() + "\n")
 
     return stats
 
diff -r 0b48e3985765 -r 7e1c8a565a4f tests/test-newbranch
--- a/tests/test-newbranch	Tue Mar 13 15:47:55 2007 -0500
+++ b/tests/test-newbranch	Tue Mar 13 18:50:02 2007 -0500
@@ -12,7 +12,7 @@
 hg ci -m "add branch name" -d "1000000 0"
 hg branch bar
 hg ci -m "change branch name" -d "1000000 0"
-hg branch ""
+hg branch default
 hg ci -m "clear branch name" -d "1000000 0"
 
 hg co foo