packaging: move the version normalization function to the util module stable

packaging: move the version normalization function to the util module

This will be used with Inno as well.  Since this module isn't platform specific,
rename to include that this is meant for Windows.  (Mac has a different format.)

Differential Revision: https://phab.mercurial-scm.org/D8059

--- a/contrib/packaging/hgpackaging/util.py	Fri Jan 31 22:20:39 2020 -0500
+++ b/contrib/packaging/hgpackaging/util.py	Sat Feb 01 00:32:46 2020 -0500
@@ -82,6 +82,66 @@
     }
 
 
+def normalize_windows_version(version):
+    """Normalize Mercurial version string so WiX/Inno accepts it.
+
+    Version strings have to be numeric ``A.B.C[.D]`` to conform with MSI's
+    requirements.
+
+    We normalize RC version or the commit count to a 4th version component.
+    We store this in the 4th component because ``A.B.C`` releases do occur
+    and we want an e.g. ``5.3rc0`` version to be semantically less than a
+    ``5.3.1rc2`` version. This requires always reserving the 3rd version
+    component for the point release and the ``X.YrcN`` release is always
+    point release 0.
+
+    In the case of an RC and presence of ``+`` suffix data, we can't use both
+    because the version format is limited to 4 components. We choose to use
+    RC and throw away the commit count in the suffix. This means we could
+    produce multiple installers with the same normalized version string.
+
+    >>> normalize_windows_version("5.3")
+    '5.3.0'
+
+    >>> normalize_windows_version("5.3rc0")
+    '5.3.0.0'
+
+    >>> normalize_windows_version("5.3rc1")
+    '5.3.0.1'
+
+    >>> normalize_windows_version("5.3rc1+2-abcdef")
+    '5.3.0.1'
+
+    >>> normalize_windows_version("5.3+2-abcdef")
+    '5.3.0.2'
+    """
+    if '+' in version:
+        version, extra = version.split('+', 1)
+    else:
+        extra = None
+
+    # 4.9rc0
+    if version[:-1].endswith('rc'):
+        rc = int(version[-1:])
+        version = version[:-3]
+    else:
+        rc = None
+
+    # Ensure we have at least X.Y version components.
+    versions = [int(v) for v in version.split('.')]
+    while len(versions) < 3:
+        versions.append(0)
+
+    if len(versions) < 4:
+        if rc is not None:
+            versions.append(rc)
+        elif extra:
+            # <commit count>-<hash>+<date>
+            versions.append(int(extra.split('-')[0]))
+
+    return '.'.join('%d' % x for x in versions[0:4])
+
+
 def find_signtool():
     """Find signtool.exe from the Windows SDK."""
     sdk = windows_10_sdk_info()

--- a/contrib/packaging/hgpackaging/wix.py	Fri Jan 31 22:20:39 2020 -0500
+++ b/contrib/packaging/hgpackaging/wix.py	Sat Feb 01 00:32:46 2020 -0500
@@ -24,6 +24,7 @@
 )
 from .util import (
     extract_zip_to_directory,
+    normalize_windows_version,
     process_install_rules,
     sign_with_signtool,
 )
@@ -71,66 +72,6 @@
     return m.group(1)
 
 
-def normalize_version(version):
-    """Normalize Mercurial version string so WiX accepts it.
-
-    Version strings have to be numeric ``A.B.C[.D]`` to conform with MSI's
-    requirements.
-
-    We normalize RC version or the commit count to a 4th version component.
-    We store this in the 4th component because ``A.B.C`` releases do occur
-    and we want an e.g. ``5.3rc0`` version to be semantically less than a
-    ``5.3.1rc2`` version. This requires always reserving the 3rd version
-    component for the point release and the ``X.YrcN`` release is always
-    point release 0.
-
-    In the case of an RC and presence of ``+`` suffix data, we can't use both
-    because the version format is limited to 4 components. We choose to use
-    RC and throw away the commit count in the suffix. This means we could
-    produce multiple installers with the same normalized version string.
-
-    >>> normalize_version("5.3")
-    '5.3.0'
-
-    >>> normalize_version("5.3rc0")
-    '5.3.0.0'
-
-    >>> normalize_version("5.3rc1")
-    '5.3.0.1'
-
-    >>> normalize_version("5.3rc1+2-abcdef")
-    '5.3.0.1'
-
-    >>> normalize_version("5.3+2-abcdef")
-    '5.3.0.2'
-    """
-    if '+' in version:
-        version, extra = version.split('+', 1)
-    else:
-        extra = None
-
-    # 4.9rc0
-    if version[:-1].endswith('rc'):
-        rc = int(version[-1:])
-        version = version[:-3]
-    else:
-        rc = None
-
-    # Ensure we have at least X.Y version components.
-    versions = [int(v) for v in version.split('.')]
-    while len(versions) < 3:
-        versions.append(0)
-
-    if len(versions) < 4:
-        if rc is not None:
-            versions.append(rc)
-        elif extra:
-            # <commit count>-<hash>+<date>
-            versions.append(int(extra.split('-')[0]))
-
-    return '.'.join('%d' % x for x in versions[0:4])
-
-
 def ensure_vc90_merge_modules(build_dir):
     x86 = (
         download_entry(
@@ -412,7 +353,7 @@
     )
 
     orig_version = version or find_version(source_dir)
-    version = normalize_version(orig_version)
+    version = normalize_windows_version(orig_version)
     print('using version string: %s' % version)
     if version != orig_version:
         print('(normalized from: %s)' % orig_version)