webkit: expose webkit branch and revision number in about pages

webkit/build/webkit_version.py

 #!/usr/bin/python
 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 '''Reads the Webkit Version.xcconfig file looking for MAJOR_VERSION and
 MINOR_VERSION, emitting them into a webkit_version.h header file as
 WEBKIT_MAJOR_VERSION and WEBKIT_MINOR_VERSION macros.
 '''
 
 import os
 import re
 import sys
 
+sys.path.insert(0, '../../build/util')
+import lastchange
+
 def ReadVersionFile(fname):
   '''Reads the Webkit Version.xcconfig file looking for MAJOR_VERSION and
      MINOR_VERSION.  This function doesn't attempt to support the full syntax
      of xcconfig files.'''
   re_major = re.compile('MAJOR_VERSION\s*=\s*(\d+).*')
   re_minor = re.compile('MINOR_VERSION\s*=\s*(\d+).*')
   major = -1
   minor = -1
   f = open(fname, 'rb')
   line = "not empty"
   while line and not (major >= 0 and minor >= 0):
     line = f.readline()
     if major == -1:
       match = re_major.match(line)
       if match:
         major = int(match.group(1))
         continue
     if minor == -1:
       match = re_minor.match(line)
       if match:
         minor = int(match.group(1))
         continue
   assert(major >= 0 and minor >= 0)
   return (major, minor)
 
 def EmitVersionHeader(version_file, output_dir):
   '''Given webkit's version file, emit a header file that we can use from
   within webkit_glue.cc.
   '''
+
   (major, minor) = ReadVersionFile(version_file)
+  (svn_url, svn_revision) = lastchange.FetchChange(
+    default_lastchange=None,
+    directory=os.path.dirname(version_file))
+
   fname = os.path.join(output_dir, "webkit_version.h")
   f = open(fname, 'wb')
   template = """// webkit_version.h
 // generated from %s
 
 #define WEBKIT_VERSION_MAJOR %d
 #define WEBKIT_VERSION_MINOR %d
-""" % (version_file, major, minor)
+#define WEBKIT_SVN_REVISION "%s@%s"
+""" % (version_file, major, minor, svn_url, svn_revision)
   f.write(template)
   f.close()
 
 def main():
   EmitVersionHeader(sys.argv[1], sys.argv[2])
 
 
 if __name__ == "__main__":
   main()