Slim sxc/pages/__init__.py for federation, test, cart, blog

Move render functions, layouts, helpers, and utils from __init__.py
to sub-modules (renders.py, layouts.py, helpers.py, utils.py).
Update all bp route imports to point at sub-modules directly.
Each __init__.py is now ≤20 lines of setup + registration.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cart/sxc/pages/layouts.py

@@ -0,0 +1,138 @@
+"""Cart layout registration and header builders."""
+from __future__ import annotations
+
+from typing import Any
+
+from markupsafe import escape
+from shared.sx.parser import SxExpr
+
+
+def _register_cart_layouts() -> None:
+    from shared.sx.layouts import register_custom_layout
+    register_custom_layout("cart-page", _cart_page_full, _cart_page_oob)
+    register_custom_layout("cart-admin", _cart_admin_full, _cart_admin_oob)
+
+
+# ---------------------------------------------------------------------------
+# Header helpers
+# ---------------------------------------------------------------------------
+
+def _ensure_post_ctx(ctx: dict, page_post: Any) -> dict:
+    """Ensure ctx has a 'post' dict from page_post DTO."""
+    if ctx.get("post") or not page_post:
+        return ctx
+    return {**ctx, "post": {
+        "id": getattr(page_post, "id", None),
+        "slug": getattr(page_post, "slug", ""),
+        "title": getattr(page_post, "title", ""),
+        "feature_image": getattr(page_post, "feature_image", None),
+    }}
+
+
+async def _ensure_container_nav(ctx: dict) -> dict:
+    """Fetch container_nav if not already present."""
+    if ctx.get("container_nav"):
+        return ctx
+    post = ctx.get("post") or {}
+    post_id = post.get("id")
+    if not post_id:
+        return ctx
+    slug = post.get("slug", "")
+    from shared.infrastructure.fragments import fetch_fragments
+    nav_params = {
+        "container_type": "page",
+        "container_id": str(post_id),
+        "post_slug": slug,
+    }
+    events_nav, market_nav = await fetch_fragments([
+        ("events", "container-nav", nav_params),
+        ("market", "container-nav", nav_params),
+    ], required=False)
+    return {**ctx, "container_nav": events_nav + market_nav}
+
+
+async def _post_header_sx(ctx: dict, page_post: Any, *, oob: bool = False) -> str:
+    from shared.sx.helpers import post_header_sx as _shared_post_header_sx
+    ctx = _ensure_post_ctx(ctx, page_post)
+    ctx = await _ensure_container_nav(ctx)
+    return await _shared_post_header_sx(ctx, oob=oob)
+
+
+async def _cart_header_sx(ctx: dict, *, oob: bool = False) -> str:
+    from shared.sx.helpers import render_to_sx, call_url
+    return await render_to_sx(
+        "menu-row-sx",
+        id="cart-row", level=1, colour="sky",
+        link_href=call_url(ctx, "cart_url", "/"),
+        link_label="cart", icon="fa fa-shopping-cart",
+        child_id="cart-header-child", oob=oob,
+    )
+
+
+async def _page_cart_header_sx(ctx: dict, page_post: Any, *, oob: bool = False) -> str:
+    from shared.sx.helpers import render_to_sx, call_url
+    slug = page_post.slug if page_post else ""
+    title = ((page_post.title if page_post else None) or "")[:160]
+    label_parts = []
+    if page_post and page_post.feature_image:
+        label_parts.append(await render_to_sx("cart-page-label-img", src=page_post.feature_image))
+    label_parts.append(f'(span "{escape(title)}")')
+    label_sx = "(<> " + " ".join(label_parts) + ")"
+    nav_sx = await render_to_sx("cart-all-carts-link", href=call_url(ctx, "cart_url", "/"))
+    return await render_to_sx(
+        "menu-row-sx",
+        id="page-cart-row", level=2, colour="sky",
+        link_href=call_url(ctx, "cart_url", f"/{slug}/"),
+        link_label_content=SxExpr(label_sx),
+        nav=SxExpr(nav_sx), oob=oob,
+    )
+
+
+async def _cart_page_admin_header_sx(ctx: dict, page_post: Any, *, oob: bool = False,
+                                  selected: str = "") -> str:
+    from shared.sx.helpers import post_admin_header_sx
+    slug = page_post.slug if page_post else ""
+    ctx = _ensure_post_ctx(ctx, page_post)
+    return await post_admin_header_sx(ctx, slug, oob=oob, selected=selected)
+
+
+# ---------------------------------------------------------------------------
+# Layout functions
+# ---------------------------------------------------------------------------
+
+async def _cart_page_full(ctx: dict, **kw: Any) -> str:
+    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
+    page_post = ctx.get("page_post")
+    env = _ctx_to_env(ctx)
+    return await render_to_sx_with_env("cart-page-layout-full", env,
+        cart_row=SxExpr(await _cart_header_sx(ctx)),
+        page_cart_row=SxExpr(await _page_cart_header_sx(ctx, page_post)),
+    )
+
+
+async def _cart_page_oob(ctx: dict, **kw: Any) -> str:
+    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env, root_header_sx
+    page_post = ctx.get("page_post")
+    env = _ctx_to_env(ctx, oob=True)
+    return await render_to_sx_with_env("cart-page-layout-oob", env,
+        root_header_oob=SxExpr(await root_header_sx(ctx, oob=True)),
+        cart_row_oob=SxExpr(await _cart_header_sx(ctx, oob=True)),
+        page_cart_row=SxExpr(await _page_cart_header_sx(ctx, page_post)),
+    )
+
+
+async def _cart_admin_full(ctx: dict, **kw: Any) -> str:
+    from shared.sx.helpers import render_to_sx_with_env, _ctx_to_env
+    page_post = ctx.get("page_post")
+    selected = kw.get("selected", "")
+    env = _ctx_to_env(ctx)
+    return await render_to_sx_with_env("cart-admin-layout-full", env,
+        post_header=SxExpr(await _post_header_sx(ctx, page_post)),
+        admin_header=SxExpr(await _cart_page_admin_header_sx(ctx, page_post, selected=selected)),
+    )
+
+
+async def _cart_admin_oob(ctx: dict, **kw: Any) -> str:
+    page_post = ctx.get("page_post")
+    selected = kw.get("selected", "")
+    return await _cart_page_admin_header_sx(ctx, page_post, oob=True, selected=selected)