Add gen_version.py script

diff --git a/gen_version.py b/gen_version.py
new file mode 100644 (file)
index 0000000..301d1e7
--- /dev/null
+++ b/gen_version.py
@@ -0,0 +1,46 @@
+# Generate version
+#
+# Stable release entry format     : <major>.<minor>.>patch>
+# Development release entry format: <major>.<minor>.<patch>-dev
+#
+# Stable release output format     : <major>.<minor>.<patch>
+# Development release output format: <major>.<minor>.<patch>-dev.<YYYYmmdd.HHMM>
+
+# The patch version of a development release should be the next stable
+# release patch number followed by "-dev". The committer date will be
+# added with a period separator.
+#
+# Example sequence:
+#
+# Entry          Output
+# 2.44.1      => 2.44.1
+# 2.44.2-dev  => 2.44.2-dev.20200704.1652
+# 2.44.2      => 2.44.2
+# 2.44.3-dev  => 2.44.3-dev.20200824.1337
+
+version = '2.44.2-dev'
+
+import os
+import subprocess
+
+major_version, minor_version, patch_version = version.split('.')
+
+try:
+    int(patch_version)
+except ValueError:
+    # Non-numerical patch version; add committer date
+    os.environ['TZ'] = 'UTC'
+    committer_date = subprocess.run(
+        [
+            'git',
+            'log',
+            '-n',
+            '1',
+            '--format=%cd',
+            '--date=format-local:%Y%m%d.%H%M'
+        ],
+        stdout=subprocess.PIPE,
+    ).stdout.decode('utf-8').strip()
+    patch_version += '.' + committer_date
+
+print(f'{major_version}.{minor_version}.{patch_version}')