hg

wix: more robust normalization of RC version components

MSI has strict version requirements where the format is
`A.B.C[.D]` and all fields must be numeric
(https://docs.microsoft.com/en-us/windows/win32/msi/productversion?redirectedfrom=MSDN).
Only the first 3 are used by the installer itself.

Mercurial's version strings can have `rcN` and an optional
`+<commit>-<date>` fragment at the end.

This commit teaches the MSI version normalization to handle
both of these more robustly.

Before, we would throw away the `.rcN` component completely.
e.g. `5.3rc1` would get normalized to `5.3.0`. And worse,
`5.3rc0+5-abcdef` would get normalized to `5.3.5`.

After this commit, presence of an `.rcN` provides the
value for a 4th field. e.g. `5.3rc1` -> `5.3.0.1`. In
addition, the commit count from the `+` suffix gets
normalized into the 4th version component, but only if
the original version string didn't have a 4th version
component or if no `rcN` is present. e.g. `5.3+5-abcdef`
is `5.3.0.5`.

Differential Revision: https://phab.mercurial-scm.org/D8003

#!/usr/bin/env python
#
# mercurial - scalable distributed SCM
#
# Copyright 2005-2007 Matt Mackall <[e-mail]>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
from __future__ import absolute_import

import os
import sys

libdir = '@LIBDIR@'

if libdir != '@' 'LIBDIR' '@':
    if not os.path.isabs(libdir):
        libdir = os.path.join(
            os.path.dirname(os.path.realpath(__file__)), libdir
        )
        libdir = os.path.abspath(libdir)
    sys.path.insert(0, libdir)

from hgdemandimport import tracing

with tracing.log('hg script'):
    # enable importing on demand to reduce startup time
    try:
        if sys.version_info[0] < 3 or sys.version_info >= (3, 6):
            import hgdemandimport

            hgdemandimport.enable()
    except ImportError:
        sys.stderr.write(
            "abort: couldn't find mercurial libraries in [%s]\n"
            % ' '.join(sys.path)
        )
        sys.stderr.write("(check your install and PYTHONPATH)\n")
        sys.exit(-1)

    from mercurial import dispatch

    dispatch.run()