[UNVERIFIED] Astra diagram pass

Architecture/diagrams/export_blocks.py

@@ -0,0 +1,35 @@
+"""Export only .drawio inputs, verify SVG content, and build PNG previews.
+
+Run with ~/.venvs/codex-schematics/bin/python. The desktop renderer may need
+execution outside a restricted Electron sandbox. It never edits source XML.
+"""
+from pathlib import Path
+import shutil
+import subprocess
+import tempfile
+import xml.etree.ElementTree as ET
+import cairosvg
+
+OUT=Path(__file__).resolve().parent
+sources=sorted(OUT.glob('*.drawio'))
+assert sources, 'No draw.io sources found'
+with tempfile.TemporaryDirectory(prefix='neoecu-drawio-') as tmp:
+    for source in sources: shutil.copy2(source,Path(tmp)/source.name)
+    subprocess.run(['/usr/bin/drawio','-x','-f','svg','-e','-b','20','--svg-theme','light','-o',str(OUT),tmp],check=True)
+
+ET.register_namespace('', 'http://www.w3.org/2000/svg')
+ET.register_namespace('xlink', 'http://www.w3.org/1999/xlink')
+for source in sources:
+    svg=source.with_suffix('.svg')
+    tree=ET.parse(svg);root=tree.getroot()
+    assert any(e.tag.endswith('text') for e in root.iter()),f'Empty figure: {svg}'
+    # draw.io emits an irrelevant fallback warning even for native SVG text.
+    # Remove only that advisory, and only when there is no foreignObject text.
+    assert not any(e.tag.endswith('foreignObject') for e in root.iter()),f'Nonportable SVG text: {svg}'
+    for parent in root.iter():
+        for child in list(parent):
+            if child.tag.endswith('switch') and 'Text is not SVG - cannot display' in ''.join(child.itertext()):
+                parent.remove(child)
+    tree.write(svg,encoding='utf-8',xml_declaration=True)
+    cairosvg.svg2png(url=str(svg),write_to=str(svg.with_suffix('.png')),background_color='white')
+print(f'Exported and checked {len(sources)} block figures.')