maintainers/scripts: add kde2nix tooling

This will be used to generate data for KDE 6 packages.

maintainers/scripts/kde/collect-metadata.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i python3 -p "python3.withPackages(ps: [ ps.click ps.pyyaml ])"
+import pathlib
+
+import click
+
+import utils
+
+@click.command
+@click.argument(
+    "repo-metadata",
+    type=click.Path(
+        exists=True,
+        file_okay=False,
+        resolve_path=True,
+        path_type=pathlib.Path,
+    ),
+)
+@click.option(
+    "--nixpkgs",
+    type=click.Path(
+        exists=True,
+        file_okay=False,
+        resolve_path=True,
+        writable=True,
+        path_type=pathlib.Path,
+    ),
+    default=pathlib.Path(__file__).parent.parent.parent.parent
+)
+def main(repo_metadata: pathlib.Path, nixpkgs: pathlib.Path):
+    metadata = utils.KDERepoMetadata.from_repo_metadata_checkout(repo_metadata)
+    out_dir = nixpkgs / "pkgs/kde/generated"
+    metadata.write_json(out_dir)
+
+if __name__ == "__main__":
+    main()  # type: ignore