Remove numbering from head>title when number-sections false

fixes #3304

Author: dragonstyle

news/changelog-1.3.md

@@ -35,6 +35,10 @@
 - Listings now support `template-params`, which will be passed to custom EJS templates in a variable called `templateParams` when a listing is rendered.
 - Custom listing objects now resolve `path: ` fields into the metadata that would be generated by standard listings, giving custom listing access to computed metadata like `reading-time`, etc.
 
+## Books
+
+- Remove chapter number of HTML head title when `number-sections` is `false` (#3304).
+
 ## Miscellaneous
 
 - Work around pandoc strict checking of `number-offset` type. ([#3126](https://github.com/quarto-dev/quarto-cli/issues/3126))

src/project/types/website/website-meta.ts

@@ -10,6 +10,7 @@ import { dirname, join, relative } from "path/mod.ts";
 import {
   kAbstract,
   kDescription,
+  kNumberSections,
   kSubtitle,
   kTitle,
 } from "../../../config/constants.ts";
@@ -418,7 +419,6 @@ function metaMarkdownPipeline(format: Format, extras: FormatExtras) {
 
       const ogMeta = opengraphMetadata(format);
       inlines[kOgTitle] = ogMeta.title as string || resolvedTitle || "";
-
       return { inlines };
     },
     processRendered(rendered: Record<string, Element>, doc: Document) {
@@ -429,7 +429,18 @@ function metaMarkdownPipeline(format: Format, extras: FormatExtras) {
           `head title`,
         );
         if (el) {
-          el.innerHTML = renderedEl.innerText;
+          if (format.pandoc[kNumberSections] === false) {
+            // Remove chapter numbers if not numbered
+            const numberEl = renderedEl.querySelector("span.chapter-number");
+            if (numberEl) {
+              numberEl.remove();
+            }
+            // Collapse contiguous whitespace
+            const collapsed = renderedEl.innerText.replaceAll(/\s+/g, " ");
+            el.innerHTML = collapsed;
+          } else {
+            el.innerHTML = renderedEl.innerText;
+          }
         }
       }