# HG changeset patch
# User Patrick Mezard <patrick@mezard.eu>
# Date 1350370021 -7200
# Node ID e1cb98792cf4b674c501fadbd1b967f0acc2f050
# Parent  289f2c7752a8e613150d76898df3cbc7f926d109
editor: do not reread all data upon branching

Branch creation is a special case of add_directory(). Until now, it was
handled by enumerating branch parent files and creating svncopy records
which were later converted into open files or pushed into the
RevisionData. By default, there is no reason to record anything, the
files are the same than in the parent changeset. The tricky part is to
correctly check the source is the parent revision. This change massively
speeds up regular branching operations.

diff --git a/hgsubversion/editor.py b/hgsubversion/editor.py
--- a/hgsubversion/editor.py
+++ b/hgsubversion/editor.py
@@ -428,18 +428,28 @@ class HgEditor(svnwrap.Editor):
             frompath = '%s/' % frompath
         else:
             frompath = ''
+
+        copyfromparent = False
+        if frompath == '' and br_path == '':
+            pnode = self.meta.get_parent_revision(
+                    self.current.rev.revnum, branch)
+            if pnode == new_hash:
+                # Data parent is topological parent and relative paths
+                # are the same, not need to do anything but restore
+                # files marked as deleted.
+                copyfromparent = True
+
         svncopies = {}
         copies = {}
         for f in fromctx:
             if not f.startswith(frompath):
                 continue
-            fctx = fromctx.filectx(f)
             dest = path + '/' + f[len(frompath):]
-            svncopies[dest] = CopiedFile(new_hash, f, None)
             if dest in self._deleted:
-                # Remove this once svn copies and edited files are
-                # clearly separated.
                 self._deleted.remove(dest)
+            if copyfromparent:
+                continue
+            svncopies[dest] = CopiedFile(new_hash, f, None)
             if branch == source_branch:
                 copies[dest] = f
         if copies: