diff --git a/hgext/record.py b/hgext/record.py
--- a/hgext/record.py
+++ b/hgext/record.py
@@ -10,65 +10,12 @@
 from mercurial.i18n import _
 from mercurial import cmdutil, commands, extensions, hg, patch
 from mercurial import util
-import copy, cStringIO, errno, os, re, shutil, tempfile
+import copy, cStringIO, errno, os, shutil, tempfile
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
 testedwith = 'internal'
 
-lines_re = re.compile(r'@@ -(\d+),(\d+) \+(\d+),(\d+) @@\s*(.*)')
-
-def scanpatch(fp):
-    """like patch.iterhunks, but yield different events
-
-    - ('file',    [header_lines + fromfile + tofile])
-    - ('context', [context_lines])
-    - ('hunk',    [hunk_lines])
-    - ('range',   (-start,len, +start,len, proc))
-    """
-    lr = patch.linereader(fp)
-
-    def scanwhile(first, p):
-        """scan lr while predicate holds"""
-        lines = [first]
-        while True:
-            line = lr.readline()
-            if not line:
-                break
-            if p(line):
-                lines.append(line)
-            else:
-                lr.push(line)
-                break
-        return lines
-
-    while True:
-        line = lr.readline()
-        if not line:
-            break
-        if line.startswith('diff --git a/') or line.startswith('diff -r '):
-            def notheader(line):
-                s = line.split(None, 1)
-                return not s or s[0] not in ('---', 'diff')
-            header = scanwhile(line, notheader)
-            fromfile = lr.readline()
-            if fromfile.startswith('---'):
-                tofile = lr.readline()
-                header += [fromfile, tofile]
-            else:
-                lr.push(fromfile)
-            yield 'file', header
-        elif line[0] == ' ':
-            yield 'context', scanwhile(line, lambda l: l[0] in ' \\')
-        elif line[0] in '-+':
-            yield 'hunk', scanwhile(line, lambda l: l[0] in '-+\\')
-        else:
-            m = lines_re.match(line)
-            if m:
-                yield 'range', m.groups()
-            else:
-                yield 'other', line
-
 
 def parsepatch(fp):
     """patch -> [] of headers -> [] of hunks """
@@ -93,7 +40,7 @@ def parsepatch(fp):
         def addcontext(self, context):
             if self.hunk:
                 h = patch.recordhunk(self.header, self.fromline, self.toline,
-                        self.proc, self.before, self.hunk, context)
+                         self.proc, self.before, self.hunk, context)
                 self.header.hunks.append(h)
                 self.fromline += len(self.before) + h.removed
                 self.toline += len(self.before) + h.added
@@ -141,7 +88,7 @@ def parsepatch(fp):
     p = parser()
 
     state = 'context'
-    for newstate, data in scanpatch(fp):
+    for newstate, data in patch.scanpatch(fp):
         try:
             p.transitions[state][newstate](p, data)
         except KeyError:
diff --git a/mercurial/patch.py b/mercurial/patch.py
--- a/mercurial/patch.py
+++ b/mercurial/patch.py
@@ -1276,6 +1276,58 @@ def makepatchmeta(backend, afile_orig, b
         gp.op = 'DELETE'
     return gp
 
+def scanpatch(fp):
+    """like patch.iterhunks, but yield different events
+
+    - ('file',    [header_lines + fromfile + tofile])
+    - ('context', [context_lines])
+    - ('hunk',    [hunk_lines])
+    - ('range',   (-start,len, +start,len, proc))
+    """
+    lines_re = re.compile(r'@@ -(\d+),(\d+) \+(\d+),(\d+) @@\s*(.*)')
+    lr = linereader(fp)
+
+    def scanwhile(first, p):
+        """scan lr while predicate holds"""
+        lines = [first]
+        while True:
+            line = lr.readline()
+            if not line:
+                break
+            if p(line):
+                lines.append(line)
+            else:
+                lr.push(line)
+                break
+        return lines
+
+    while True:
+        line = lr.readline()
+        if not line:
+            break
+        if line.startswith('diff --git a/') or line.startswith('diff -r '):
+            def notheader(line):
+                s = line.split(None, 1)
+                return not s or s[0] not in ('---', 'diff')
+            header = scanwhile(line, notheader)
+            fromfile = lr.readline()
+            if fromfile.startswith('---'):
+                tofile = lr.readline()
+                header += [fromfile, tofile]
+            else:
+                lr.push(fromfile)
+            yield 'file', header
+        elif line[0] == ' ':
+            yield 'context', scanwhile(line, lambda l: l[0] in ' \\')
+        elif line[0] in '-+':
+            yield 'hunk', scanwhile(line, lambda l: l[0] in '-+\\')
+        else:
+            m = lines_re.match(line)
+            if m:
+                yield 'range', m.groups()
+            else:
+                yield 'other', line
+
 def scangitpatch(lr, firstline):
     """
     Git patches can emit: