Vermietungs-Tool

A local web app for a small room-rental business in Austria: guest register,
room ledger, occupancy plan, invoices, the monthly tourist-tax report and the
quarterly VAT list. Application code only; it ships no data.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/money.py

@@ -0,0 +1,45 @@
+"""German number/currency formatting for display (1.234,56 €)."""
+from app import i18n
+
+
+def de_number(value, decimals=2):
+    if value is None or value == "":
+        return ""
+    formatted = f"{float(value):,.{decimals}f}"          # 1,234.56
+    return formatted.replace(",", "\x00").replace(".", ",").replace("\x00", ".")
+
+
+def euro(value):
+    if value is None or value == "":
+        return ""
+    return f"{de_number(value)} €"
+
+
+WEEKDAYS = i18n.t("weekdays_short")
+
+
+def de_date_wd(iso):
+    """'Mo 13.09.2026' — the weekday before the date, so the lists show at once which day an arrival or
+    departure falls on (weekly prices run from weekday to weekday)."""
+    import datetime
+    text = de_date(iso)
+    if not text:
+        return text
+    try:
+        day = datetime.date.fromisoformat(str(iso)[:10])
+    except ValueError:
+        return text                      # not a real date (a month name or the like) — leave it as it is
+    # a non-breaking space: on paper the table would otherwise break between weekday and date
+    # ("So" on one line, "13.09.2026" on the next)
+    return f"{WEEKDAYS[day.weekday()]} {text}"
+
+
+def de_date(iso):
+    """ISO yyyy-mm-dd -> German dd.mm.yyyy for display."""
+    if not iso:
+        return ""
+    try:
+        y, m, d = str(iso).split("-")
+        return f"{d}.{m}.{y}"
+    except ValueError:
+        return str(iso)