feat: create validated ZUGFeRD invoices in one console command

jr_einvoice/paths.py

@@ -0,0 +1,18 @@
+"""Bundled resources and writable, private user data locations."""
+import os
+from pathlib import Path
+
+
+def resource_root() -> Path:
+    source = Path(__file__).resolve().parent.parent
+    return source if (source / 'templates/invoice.html.j2').is_file() else Path(__file__).resolve().parent / 'data'
+
+
+def private_root(resources: Path | None = None) -> Path:
+    root = resources or resource_root()
+    default = root / 'private' if root.name != 'data' else Path.home() / '.local/share/jr-einvoice'
+    return Path(os.environ.get('JR_EINVOICE_HOME', str(default))).expanduser().resolve()
+
+
+def presets_root(resources: Path | None = None) -> Path:
+    return Path(os.environ.get('JR_EINVOICE_PRESETS', str(private_root(resources) / 'presets'))).expanduser().resolve()