add pre-commit hook to ensure consistency of version in changelog

.pre-commit-config.yaml

@@ -14,3 +14,10 @@ repos:
     rev: v2.1.1
     hooks:
       - id: darker
+  - repo: local
+    hooks:
+      - id: changelog-version-consistency
+        name: "Ensure changelog 'in progress' version matches package version"
+        language: system
+        files: 'CHANGELOG\.md|openeogeotrellis/_version\.py'
+        entry: python ./scripts/changelog-version-consistency.py

scripts/changelog-version-consistency.py

@@ -0,0 +1,54 @@
+# TODO: move this script to a repo that allow better reuse?
+
+import re
+import textwrap
+from pathlib import Path
+
+
+def get_version(path: Path) -> str:
+    """Get version from _version.py"""
+    versions = re.findall(r"__version__\s*=\s*['\"](.*?)['\"]", path.read_text(encoding="utf8"))
+    if len(versions) != 1:
+        raise ValueError(f"Expected one version, but found {versions}")
+    return versions[0]
+
+
+def get_in_progress_header(path: Path) -> str:
+    """Get 'In progress' header from CHANGELOG.md"""
+    in_progress_headers = re.findall(
+        r"^## In progress: .*$", path.read_text(encoding="utf8"), re.MULTILINE | re.IGNORECASE
+    )
+    if len(in_progress_headers) != 1:
+        raise ValueError(f"Expected single 'In progress' header, but found {in_progress_headers}")
+    return in_progress_headers[0]
+
+
+def main():
+    root = Path.cwd()
+
+    version_path = root / "openeogeotrellis" / "_version.py"
+    expected_version = get_version(version_path)
+    expected_version = expected_version.partition("a")[0]
+    expected_in_progress_header = f"## In progress: {expected_version}"
+
+    changelog_path = root / "CHANGELOG.md"
+    in_progress_header = get_in_progress_header(path=changelog_path)
+
+    if in_progress_header.lower() != expected_in_progress_header.lower():
+        print(
+            textwrap.dedent(
+                f"""\
+                Version inconsistency in CHANGELOG.md.
+                Expected:
+                    {expected_in_progress_header}
+                but found:
+                    {in_progress_header}
+                """
+            )
+        )
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())