diff -r 000000000000 -r 6474c204b198 config/printprereleasesuffix.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/config/printprereleasesuffix.py	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,31 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+# Prints the pre-release version suffix based on the version string
+#
+# Examples:
+# 2.1a3    > " 2.1 Alpha 3"
+# 2.1a3pre > ""
+# 3.2b4    > " 3.2 Beta 4"
+# 3.2b4pre > ""
+from __future__ import print_function
+
+import sys
+import re
+
+def get_prerelease_suffix(version):
+  """ Returns the prerelease suffix from the version string argument """
+
+  def mfunc(m):
+    return " {0} {1} {2}".format(m.group('prefix'),
+                                 {'a': 'Alpha', 'b': 'Beta'}[m.group('c')],
+                                 m.group('suffix'))
+  result, c = re.subn(r'^(?P<prefix>(\d+\.)*\d+)(?P<c>[ab])(?P<suffix>\d+)$',
+                      mfunc, version)
+  if c != 1:
+    return ''
+  return result
+
+if len(sys.argv) == 2:
+  print(get_prerelease_suffix(sys.argv[1]))