fix: install site sections before the page plan

plan_emulator_pages names systems, and siterender then fell back to the repository's database.json and emulators/ whatever --db and --emulators-dir gave.

scripts/generate_site.py

@@ -12142,15 +12142,16 @@ def _generate(args: argparse.Namespace) -> None:
     # The test each emulator page builds for itself: the parts a page is
     # cut into weigh the status its rows show.
     file_held = _availability_check(db, suppl_names)
+    # The plan names systems: the sections must be this run's data first.
+    manufacturers = _group_by_manufacturer(db)
+    set_console_sections(manufacturers, program_names(profiles))
     plan_emulator_pages(profiles, file_held)
     # Build system_id -> manufacturer page map (needed by all generators)
     print("Building system cross-reference map...")
-    manufacturers = _group_by_manufacturer(db)
     set_system_page_map(
         _system_pages_from_data(manufacturers, coverages, db, profiles)
     )
     print(f"  {len(_system_page_map)} system IDs mapped to pages")
-    set_console_sections(manufacturers, program_names(profiles))
     from siterender import link_coverage, system_ids  # noqa: PLC0415
 
     print("Generating system pages...")

tests/test_site_system_names.py

@@ -118,3 +118,22 @@ class SystemNames(unittest.TestCase):
 
 if __name__ == "__main__":
     unittest.main()
+
+
+class SectionsComeBeforeThePlan(unittest.TestCase):
+    """plan_emulator_pages names systems. Run before set_console_sections,
+    it made siterender read ./database.json and ./emulators whatever --db
+    and --emulators-dir gave, so the parts were cut on another collection."""
+
+    def test_generate_installs_the_sections_before_planning(self):
+        import ast
+        import inspect
+
+        import generate_site
+
+        tree = ast.parse(inspect.getsource(generate_site._generate))
+        lines = {}
+        for node in ast.walk(tree):
+            if isinstance(node, ast.Call) and isinstance(node.func, ast.Name):
+                lines.setdefault(node.func.id, node.lineno)
+        self.assertLess(lines["set_console_sections"], lines["plan_emulator_pages"])