split code into submodules

src/nominatim_db/version.py

@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# This file is part of Nominatim. (https://nominatim.org)
+#
+# Copyright (C) 2024 by the Nominatim developer community.
+# For a full list of authors see the git log.
+"""
+Version information for Nominatim.
+"""
+from typing import Optional, NamedTuple
+
+class NominatimVersion(NamedTuple):
+    """ Version information for Nominatim. We follow semantic versioning.
+
+        Major, minor and patch_level refer to the last released version.
+        The database patch level tracks important changes between releases
+        and must always be increased when there is a change to the database or code
+        that requires a migration.
+
+        When adding a migration on the development branch, raise the patch level
+        to 99 to make sure that the migration is applied when updating from a
+        patch release to the next minor version. Patch releases usually shouldn't
+        have migrations in them. When they are needed, then make sure that the
+        migration can be reapplied and set the migration version to the appropriate
+        patch level when cherry-picking the commit with the migration.
+    """
+
+    major: int
+    minor: int
+    patch_level: int
+    db_patch_level: int
+
+    def __str__(self) -> str:
+        return f"{self.major}.{self.minor}.{self.patch_level}-{self.db_patch_level}"
+
+    def release_version(self) -> str:
+        """ Return the release version in semantic versioning format.
+
+            The release version does not include the database patch version.
+        """
+        return f"{self.major}.{self.minor}.{self.patch_level}"
+
+NOMINATIM_VERSION = NominatimVersion(4, 4, 99, 1)
+
+POSTGRESQL_REQUIRED_VERSION = (9, 6)
+POSTGIS_REQUIRED_VERSION = (2, 2)
+
+# Cmake sets a variable @GIT_HASH@ by executing 'git --log'. It is not run
+# on every execution of 'make'.
+# cmake/tool-installed.tmpl is used to build the binary 'nominatim'. Inside
+# there is a call to set the variable value below.
+GIT_COMMIT_HASH : Optional[str] = None
+
+
+def parse_version(version: str) -> NominatimVersion:
+    """ Parse a version string into a version consisting of a tuple of
+        four ints: major, minor, patch level, database patch level
+
+        This is the reverse operation of `version_str()`.
+    """
+    parts = version.split('.')
+    return NominatimVersion(*[int(x) for x in parts[:2] + parts[2].split('-')])