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/pdf.py

@@ -0,0 +1,25 @@
+"""Render invoice HTML to PDF with a headless Chromium-family browser through Playwright.
+
+PDF_BROWSER picks the browser: an installed `msedge` (default) or `chrome`, or `chromium` — Playwright's own
+build, after `playwright install chromium`."""
+from playwright.sync_api import sync_playwright
+
+from app import config
+
+BROWSER = config.get("PDF_BROWSER", "msedge")
+
+
+def render(html):
+    """The A4 PDF of a full-bleed HTML page, as bytes."""
+    with sync_playwright() as p:
+        browser = p.chromium.launch(channel=BROWSER)
+        try:
+            page = browser.new_page()
+            page.set_content(html, wait_until="load")
+            # Full-bleed: the template's @page/.sheet own every margin, so the sheet maps 1:1 to the A4 page
+            # and the address can be placed by physical millimetres (window-envelope position). Any margin
+            # here would re-inset (and scale) the 210mm sheet and throw those millimetres off.
+            return page.pdf(format="A4", print_background=True, prefer_css_page_size=True,
+                            margin={"top": "0", "bottom": "0", "left": "0", "right": "0"})
+        finally:
+            browser.close()