--- a/hgext/mq.py	Wed Apr 07 00:10:54 2010 +0900
+++ b/hgext/mq.py	Wed Apr 07 00:45:20 2010 +0900
@@ -477,25 +477,9 @@
     def printdiff(self, repo, diffopts, node1, node2=None, files=None,
                   fp=None, changes=None, opts={}):
         stat = opts.get('stat')
-
         m = cmdutil.match(repo, files, opts)
-        if fp is None:
-            write = repo.ui.write
-        else:
-            def write(s, **kw):
-                fp.write(s)
-        if stat:
-            diffopts.context = 0
-            width = self.ui.interactive() and util.termwidth() or 80
-            chunks = patch.diff(repo, node1, node2, m, changes, diffopts)
-            for chunk, label in patch.diffstatui(util.iterlines(chunks),
-                                                 width=width,
-                                                 git=diffopts.git):
-                write(chunk, label=label)
-        else:
-            for chunk, label in patch.diffui(repo, node1, node2, m, changes,
-                                              diffopts):
-                write(chunk, label=label)
+        cmdutil.diffordiffstat(self.ui, repo, diffopts, node1, node2,  m,
+                               changes, stat, fp)
 
     def mergeone(self, repo, mergeq, head, patch, rev, diffopts):
         # first try just applying the patch

--- a/mercurial/cmdutil.py	Wed Apr 07 00:10:54 2010 +0900
+++ b/mercurial/cmdutil.py	Wed Apr 07 00:45:20 2010 +0900
@@ -701,6 +701,30 @@
     for seqno, rev in enumerate(revs):
         single(rev, seqno + 1, fp)
 
+def diffordiffstat(ui, repo, diffopts, node1, node2, match,
+                   changes=None, stat=False, fp=None):
+    '''show diff or diffstat.'''
+    if fp is None:
+        write = ui.write
+    else:
+        def write(s, **kw):
+            fp.write(s)
+
+    if stat:
+        diffopts.context = 0
+        width = 80
+        if not ui.plain():
+            width = util.termwidth()
+        chunks = patch.diff(repo, node1, node2, match, changes, diffopts)
+        for chunk, label in patch.diffstatui(util.iterlines(chunks),
+                                             width=width,
+                                             git=diffopts.git):
+            write(chunk, label=label)
+    else:
+        for chunk, label in patch.diffui(repo, node1, node2, match,
+                                         changes, diffopts):
+            write(chunk, label=label)
+
 class changeset_printer(object):
     '''show changeset information when templating not requested.'''
 

--- a/mercurial/commands.py	Wed Apr 07 00:10:54 2010 +0900
+++ b/mercurial/commands.py	Wed Apr 07 00:45:20 2010 +0900
@@ -1172,23 +1172,9 @@
     if reverse:
         node1, node2 = node2, node1
 
-    if stat:
-        opts['unified'] = '0'
     diffopts = patch.diffopts(ui, opts)
-
     m = cmdutil.match(repo, pats, opts)
-    if stat:
-        it = patch.diff(repo, node1, node2, match=m, opts=diffopts)
-        width = 80
-        if not ui.plain():
-            width = util.termwidth()
-        for chunk, label in patch.diffstatui(util.iterlines(it), width=width,
-                                             git=diffopts.git):
-            ui.write(chunk, label=label)
-    else:
-        it = patch.diffui(repo, node1, node2, match=m, opts=diffopts)
-        for chunk, label in it:
-            ui.write(chunk, label=label)
+    cmdutil.diffordiffstat(ui, repo, diffopts, node1, node2, m, stat=stat)
 
 def export(ui, repo, *changesets, **opts):
     """dump the header and diffs for one or more changesets