feat: create validated ZUGFeRD invoices in one console command

jr_einvoice/init.py

@@ -1,10 +1,11 @@
 from __future__ import annotations
 from pathlib import Path
 import shutil
+from .paths import presets_root
 from datetime import date, timedelta
 
 from .presets import load_yaml, deep_merge, load_customer_preset
-from .invoice_number import suggest_next_invoice_number
+from .invoice_number import suggest_next_invoice_number, invoice_root_lock
 from .folder_naming import default_invoice_folder_name
 
 import yaml
@@ -24,6 +25,8 @@ def init_invoice_folder(
     project: str | None = None,
 ) -> Path:
     target_dir = target_dir.resolve()
+    if (target_dir / "invoice.yaml").exists() and not force:
+        raise FileExistsError(f"{target_dir / 'invoice.yaml'} already exists")
     target_dir.mkdir(parents=True, exist_ok=True)
 
     # Create standard subfolders
@@ -44,6 +47,8 @@ def init_invoice_folder(
 
     # Apply seller defaults
     seller_defaults = load_yaml(repo_root / "presets" / "seller.default.yaml")
+    local = presets_root(repo_root)
+    seller_defaults = deep_merge(seller_defaults, load_yaml(local / "seller.default.yaml"))
     merged = deep_merge(base_tpl, seller_defaults)
 
     # Apply customer preset
@@ -53,7 +58,7 @@ def init_invoice_folder(
             merged = deep_merge(merged, preset)
             logger.info("Applied customer preset: %s", customer)
         else:
-            logger.warning("Customer preset not found for: %s (continuing with generic buyer)", customer)
+            raise ValueError(f"Unknown customer preset: {customer}")
 
     # Smart defaults for meta/payment
     today = date.today()
@@ -102,7 +107,7 @@ def init_invoice_folder(
     logger.info("Initialized invoice folder: %s", target_dir)
     return target_dir
 
-def init_invoice_under_root(
+def _init_invoice_under_root(
     invoices_root: Path,
     repo_root: Path,
     logger,
@@ -135,3 +140,8 @@ def init_invoice_under_root(
         invoices_root=invoices_root,
         project=project,
     )
+
+
+def init_invoice_under_root(invoices_root: Path, **kwargs) -> Path:
+    with invoice_root_lock(invoices_root):
+        return _init_invoice_under_root(invoices_root, **kwargs)