# HG changeset patch
# User Thomas Arendsen Hein <thomas@intevation.de>
# Date 2008-02-13 23:13:20
# Node ID 41aa0a37d9be14c85eef9affd746d9a498e47d83
# Parent  152b6c5c1574871124f9c093bcbbbeda5594e927
# Parent  fb259a3572e95861dfd30a6e32a2b6b5a4305ec0

merge with main

diff --git a/contrib/mergetools.hgrc b/contrib/mergetools.hgrc
--- a/contrib/mergetools.hgrc
+++ b/contrib/mergetools.hgrc
@@ -28,6 +28,7 @@ xxdiff.gui=True
 xxdiff.priority=-8
 
 diffmerge.args=--nosplash --merge --title1=base --title2=local --title3=other $base $local $other
+diffmerge.checkchanged=True
 diffmerge.gui=True
 
 p4merge.args=$base $local $other $output
diff --git a/doc/hgrc.5.txt b/doc/hgrc.5.txt
--- a/doc/hgrc.5.txt
+++ b/doc/hgrc.5.txt
@@ -289,6 +289,10 @@ merge-tools::
     Check whether there are conflicts even though the tool reported
     success.
     Default: False
+  checkchanged;;
+    Check whether outputs were written even though the tool reported
+    success.
+    Default: False
   fixeol;;
     Attempt to fix up EOL changes caused by the merge tool.
     Default: False
diff --git a/hgext/convert/cvs.py b/hgext/convert/cvs.py
--- a/hgext/convert/cvs.py
+++ b/hgext/convert/cvs.py
@@ -71,7 +71,7 @@ class convert_cvs(converter_source):
                     elif l.startswith("Ancestor branch"):
                         ancestor = l[17:-1]
                         # figure out the parent later
-                        self.parent[id] = None
+                        self.parent[id] = self.lastbranch[ancestor]
                     elif l.startswith("Author"):
                         author = self.recode(l[8:-1])
                     elif l.startswith("Tag:") or l.startswith("Tags:"):
@@ -101,13 +101,14 @@ class convert_cvs(converter_source):
                             p = []
                         if branch == "HEAD":
                             branch = ""
-                        if branch and p[0] == None:
+                        if branch:
                             latest = None
                             # the last changeset that contains a base
                             # file is our parent
                             for r in oldrevs:
-                                latest = max(filerevids[r], latest)
-                            p = [latest]
+                                latest = max(filerevids.get(r, None), latest)
+                            if latest:
+                                p = [latest]
 
                         # add current commit to set
                         c = commit(author=author, date=date, parents=p,
diff --git a/mercurial/filemerge.py b/mercurial/filemerge.py
--- a/mercurial/filemerge.py
+++ b/mercurial/filemerge.py
@@ -7,7 +7,7 @@
 
 from node import *
 from i18n import _
-import util, os, tempfile, context, simplemerge, re
+import util, os, tempfile, context, simplemerge, re, filecmp
 
 def _toolstr(ui, tool, part, default=""):
     return ui.config("merge-tools", tool + "." + part, default)
@@ -60,10 +60,14 @@ def _picktool(repo, ui, path, binary, sy
         t = k.split('.')[0]
         if t not in tools:
             tools[t] = int(_toolstr(ui, t, "priority", "0"))
+    names = tools.keys()
     tools = [(-p,t) for t,p in tools.items()]
     tools.sort()
-    if ui.config("ui", "merge"):
-        tools.insert(0, (None, ui.config("ui", "merge"))) # highest priority
+    uimerge = ui.config("ui", "merge")
+    if uimerge:
+        if uimerge not in names:
+            return (uimerge, uimerge)
+        tools.insert(0, (None, uimerge)) # highest priority
     tools.append((None, "hgmerge")) # the old default, if found
     for p,t in tools:
         toolpath = _findtool(ui, t)
@@ -193,6 +197,13 @@ def filemerge(repo, fw, fd, fo, wctx, mc
         if re.match("^(<<<<<<< .*|=======|>>>>>>> .*)$", fcm.data()):
             r = 1
 
+    if not r and _toolbool(ui, tool, "checkchanged"):
+        if filecmp.cmp(repo.wjoin(fd), back):
+            if ui.prompt(_(" output file %s appears unchanged\n"
+                "was merge successful (yn)?") % fd,
+                _("[yn]"), _("n")) != _("y"):
+                r = 1
+
     if _toolbool(ui, tool, "fixeol"):
         _matcheol(repo.wjoin(fd), back)
 
diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -459,6 +459,8 @@ def _matcher(canonroot, cwd, names, inc,
             return
         try:
             pat = '(?:%s)' % '|'.join([regex(k, p, tail) for (k, p) in pats])
+            if len(pat) > 20000:
+                raise OverflowError()
             return re.compile(pat).match
         except OverflowError:
             # We're using a Python with a tiny regex engine and we