section splitter

_includes/updates.njk

@@ -0,0 +1,6 @@
+
+{% for section in content | sections %}
+  START SECTION
+  {{ section | safe }}
+  END SECTION
+{% endfor %}

content/sitemap/sitemap.xml.njk

@@ -1,14 +0,0 @@
----
-permalink: /sitemap.xml
-eleventyExcludeFromCollections: true
----
-<?xml version="1.0" encoding="utf-8"?>
-<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml">
-{%- for page in collections.all %}
-	{% set absoluteUrl %}{{ page.url | htmlBaseUrl(metadata.url) }}{% endset %}
-	<url>
-		<loc>{{ absoluteUrl }}</loc>
-		<lastmod>{{ page.date | htmlDateString }}</lastmod>
-	</url>
-{%- endfor %}
-</urlset>

content/updates.md

@@ -0,0 +1,11 @@
+---
+layout: updates.njk
+---
+
+# first update
+
+content
+
+# second update
+
+more content

eleventy.config.js

@@ -1,7 +1,8 @@
-import { DateTime } from "luxon";
 import pluginSyntaxHighlight from "@11ty/eleventy-plugin-syntaxhighlight";
 import { EleventyHtmlBasePlugin } from "@11ty/eleventy";
 import pluginRss from '@11ty/eleventy-plugin-rss';
+import { JSDOM } from 'jsdom';
+import { DateTime } from "luxon";
 
 /** @param {import('@11ty/eleventy').UserConfig} eleventyConfig */
 export default function(eleventyConfig) {
@@ -92,6 +93,29 @@ export default function(eleventyConfig) {
 		}
 	});
 
+	// https://stackoverflow.com/a/74005383
+	eleventyConfig.addFilter('sections', (html) => {
+		const dom = new JSDOM(html);
+		const document = dom.window.document;
+		const chunks = [];
+		for (const h1 of document.querySelectorAll('h1')) {
+			let chunk = '';
+			let elem = h1;
+			while (true) {
+				chunk += elem.outerHTML;
+				elem = document.evaluate(
+					"following-sibling::*[1]", 
+					elem,
+					function() {},
+					dom.window.XPathResult.FIRST_ORDERED_NODE_TYPE
+				).singleNodeValue;
+				if (!elem || elem.nodeName === 'H1') break;
+			}
+			chunks.push(chunk);
+		}
+		return chunks;
+	});
+
 	eleventyConfig.addShortcode("currentBuildDate", () => {
 		return (new Date()).toISOString();
 	})

package.json

@@ -38,6 +38,7 @@
 		"@11ty/eleventy-plugin-rss": "^2.0.2",
 		"@11ty/eleventy-plugin-syntaxhighlight": "^5.0.0",
 		"cross-env": "^7.0.3",
+		"jsdom": "^25.0.1",
 		"luxon": "^3.3.0",
 		"markdown-it-anchor": "^8.6.7"
 	}