Spinoff of bug 481680. As bsmedberg stated, python or perl is more reliable / consistent when doing this on all platforms.

The tests are there but they need some additional work / cleanup

Marking blocking as we'll need this for the next beta; alternative is to unblock on this and remember to file a blocking bug on manually overriding the OSX title change every time.

--> P1, as this bug will require the wider feedback of a beta release or is of sufficient complexity that we should be looking at it sooner, not later.

Benjamin, I went with something a little more complex in order to restrict creating the pre-release suffix to version strings that only contain 0-9, periods, and a single 'a' or a single 'b' since version strings can be of the format 1.1aa per https://developer.mozilla.org/En/Toolkit_version_format

Comment on attachment 367545 [details] [diff] [review] patch rev2 - removed redundant check and added a couple of tests >+++ b/config/printprereleasesuffix.py >+def get_prerelease_suffix(version): I think this can be simpler and easier to read: def mfunc(m): return "%s %s %s" % (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

Oh, it would be better to do := instead of = in the makefile, so that we only run the python script once.

pushed to mozilla-central http://hg.mozilla.org/mozilla-central/rev/ae69c2f236cd

Pushed to mozilla-1.9.1 http://hg.mozilla.org/releases/mozilla-1.9.1/rev/f72fc9fafde7