changes

src/export/epub.ts

@@ -1,6 +1,6 @@
 import type { JSONContent } from "@tiptap/core";
 import { invoke } from "@tauri-apps/api/core";
-import { type Book, type FigurePlacement, TRIM_DIMS, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement } from "../model/book";
+import { type Book, type FigurePlacement, TRIM_DIMS, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement, partNumber, partRoman } from "../model/book";
 import { fontStack, fontsUsed } from "../model/fonts";
 
 export interface EpubFile {
@@ -338,9 +338,12 @@ function contentOpf(
 function navXhtml(book: Book): string {
   const items = book.chapters
     .map((chapter, i) => {
-      if (chapter.noTitle && chapterKind(chapter) !== "body") return "";
-      const fallback = chapterKind(chapter) === "body" ? `Chapter ${bodyNumber(book.chapters, i)}` : "Untitled";
-      const label = chapter.noTitle ? fallback : chapter.title || fallback;
+      const kind = chapterKind(chapter);
+      if (chapter.noTitle && kind !== "body" && kind !== "part") return "";
+      const partLabel = `Part ${partRoman(partNumber(book.chapters, i) ?? 0)}`;
+      const fallback = kind === "body" ? `Chapter ${bodyNumber(book.chapters, i)}` : kind === "part" ? partLabel : "Untitled";
+      const base = chapter.noTitle ? fallback : chapter.title || fallback;
+      const label = kind === "part" && !chapter.noTitle && chapter.title ? `${partLabel}: ${chapter.title}` : base;
       return `      <li><a href="chapter-${i + 1}.xhtml">${esc(label)}</a></li>`;
     })
     .filter(Boolean)
@@ -366,16 +369,20 @@ function chapterXhtml(book: Book, index: number, paths: Map<string, string>): st
   const chapter = book.chapters[index];
   const kind = chapterKind(chapter);
   const num = bodyNumber(book.chapters, index);
-  const title = chapter.title || (kind === "body" ? `Chapter ${num}` : "Untitled");
-  const eyebrow = kind === "body" ? `<p class="eyebrow">Chapter ${num}</p>` : "";
-  const heading = chapter.noTitle ? "" : `<h1>${esc(title)}</h1>`;
+  const partLabel = `Part ${partRoman(partNumber(book.chapters, index) ?? 0)}`;
+  const eyebrow =
+    kind === "body" ? `<p class="eyebrow">Chapter ${num}</p>` : kind === "part" ? `<p class="eyebrow">${esc(partLabel)}</p>` : "";
+  const headingText = kind === "part" ? chapter.title : chapter.title || (kind === "body" ? `Chapter ${num}` : "Untitled");
+  const heading = chapter.noTitle || (kind === "part" && !chapter.title) ? "" : `<h1>${esc(headingText)}</h1>`;
+  const docTitle = chapter.title || (kind === "part" ? partLabel : kind === "body" ? `Chapter ${num}` : "Untitled");
+  const epubType = kind === "body" ? "chapter" : kind === "part" ? "part" : kind === "front" ? "frontmatter" : "backmatter";
   return `<?xml version="1.0" encoding="UTF-8"?>
 <html xmlns="http://www.w3.org/1999/xhtml" xmlns:epub="http://www.idpf.org/2007/ops" lang="${attr(book.metadata.language || "en")}">
   <head>
-    <title>${esc(title)}</title>
+    <title>${esc(docTitle)}</title>
     <link rel="stylesheet" type="text/css" href="style.css"/>
   </head>
-  <body epub:type="${kind === "body" ? "chapter" : kind === "front" ? "frontmatter" : "backmatter"}">
+  <body epub:type="${epubType}">
     <header class="chapter-opener">
       ${eyebrow}
       ${heading}
@@ -435,6 +442,18 @@ h2, h3 {
   margin: 3em 0 2.2em;
 }
 
+body[epub:type="part"] {
+  page-break-before: always;
+}
+
+body[epub:type="part"] .chapter-opener {
+  margin-top: 32vh;
+}
+
+body[epub:type="part"] .eyebrow {
+  font-size: 0.82em;
+}
+
 .eyebrow {
   text-transform: uppercase;
   letter-spacing: 0.28em;

src/export/typst.ts

@@ -1,5 +1,5 @@
 import type { JSONContent } from "@tiptap/core";
-import { type Book, type FigurePlacement, type TrimSize, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement } from "../model/book";
+import { type Book, type FigurePlacement, type TrimSize, FIGURE_WIDTH, bodyNumber, chapterKind, isResizablePlacement, partNumber, partRoman } from "../model/book";
 import { fontFamilyName, fontsUsed } from "../model/fonts";
 import type { ImageInput } from "../ipc";
 
@@ -166,6 +166,20 @@ function preamble(book: Book): string {
   v(1.5em)
 }
 
+#let openpart(info) = {
+  pagebreak(to: "odd", weak: true)
+  [#metadata(info) <chap>]
+  v(3.1in)
+  align(center)[
+    #text(font: "Hanken Grotesk", size: 10pt, weight: "semibold", tracking: 0.34em)[#upper("Part " + info.numeral)]
+    #if not info.notitle and info.title != "" {
+      v(0.85em)
+      heading(level: 1, numbering: none, outlined: info.toc)[#info.title]
+    }
+  ]
+  v(1.5em)
+}
+
 #let pageof(loc) = {
   let pat = loc.page-numbering()
   if pat == none { pat = "1" }
@@ -186,6 +200,7 @@ function preamble(book: Book): string {
       let info = it.value
       let pg = pageof(it.location())
       let body = info.kind == "body"
+      let part = info.kind == "part"
       let gap = if prev != none and prev != info.kind { 1.7em } else { 0.95em }
       prev = info.kind
       block(width: 100%, above: gap, below: 0.95em, {
@@ -195,7 +210,9 @@ function preamble(book: Book): string {
           column-gutter: (0.65em, 1em),
           align: (right + top, left + top, right + top),
           if body { info.num } else { [] },
-          if body { info.title } else { emph(info.title) },
+          if part {
+            strong(if info.title != "" { "Part " + info.numeral + ": " + info.title } else { "Part " + info.numeral })
+          } else if body { info.title } else { emph(info.title) },
           pg,
         )]
       })
@@ -312,16 +329,23 @@ function normTitle(title: string): string {
 
 function inToc(book: Book, index: number): boolean {
   const chapter = book.chapters[index];
-  if (chapter.noTitle && chapterKind(chapter) !== "body") return false;
+  const kind = chapterKind(chapter);
+  if (kind === "part") return true;
+  if (chapter.noTitle && kind !== "body") return false;
   const title = cleanTitle(chapter.title) || "Untitled";
-  return !(chapterKind(chapter) === "front" && normTitle(title) === normTitle(book.metadata.title));
+  return !(kind === "front" && normTitle(title) === normTitle(book.metadata.title));
 }
 
 function openerCall(book: Book, index: number): string {
   const chapter = book.chapters[index];
   const kind = chapterKind(chapter);
-  const num = kind === "body" ? String(bodyNumber(book.chapters, index)) : "";
   const notitle = !!chapter.noTitle;
+  if (kind === "part") {
+    const numeral = partRoman(partNumber(book.chapters, index) ?? 0);
+    const title = notitle ? "" : cleanTitle(chapter.title);
+    return `#openpart((kind: "part", numeral: ${str(numeral)}, title: ${str(title)}, notitle: ${notitle}, toc: ${inToc(book, index)}))`;
+  }
+  const num = kind === "body" ? String(bodyNumber(book.chapters, index)) : "";
   const title = notitle ? "" : cleanTitle(chapter.title) || "Untitled";
   return `#openchapter((kind: ${str(kind)}, num: ${str(num)}, title: ${str(title)}, notitle: ${notitle}, toc: ${inToc(book, index)}))`;
 }
@@ -335,13 +359,13 @@ export function bookToTypst(book: Book, paths: Map<string, string> = new Map(),
 #set page(numbering: "i")
 #counter(page).update(1)`;
 
-  const firstBody = book.chapters.findIndex((c) => chapterKind(c) === "body");
+  const firstMain = book.chapters.findIndex((c) => chapterKind(c) === "body" || chapterKind(c) === "part");
   const firstToc = book.chapters.findIndex((_, i) => inToc(book, i));
 
   const body = book.chapters
     .map((chapter, i) => {
       const toc = i === firstToc ? `#contents()\n\n` : "";
-      const reset = i === firstBody ? `#set page(numbering: "1")\n#counter(page).update(1)\n` : "";
+      const reset = i === firstMain ? `#set page(numbering: "1")\n#counter(page).update(1)\n` : "";
       return `${toc}${reset}${openerCall(book, i)}\n\n${chapterBody(chapter.content, paths)}`;
     })
     .join("\n\n");