feat(monospace): EPUB embed-font helper + manifest patcher

2026-08-03 02:11:07 +05:30 · 2026-07-23 09:34:57 +05:30
parent 992c6b72d6
commit 0c37a8ca2d
2 changed files with 90 additions and 0 deletions
@@ -0,0 +1,37 @@
+'use strict';
+
+const fs = require('fs');
+const path = require('path');
+const JSZip = require('jszip');
+
+function withEpubEmbedFontArgs(pandocArgs, ttfPath, _fontFamily) {
+  return [`--epub-embed-font=${ttfPath}`, ...pandocArgs];
+}
+
+async function embedEpubFont(epubPath, ttfPath, _fontFamily) {
+  if (!ttfPath || !fs.existsSync(ttfPath)) {
+    throw new Error(`EpubFontEmbedder: TTF not found at ${ttfPath}`);
+  }
+  const bytes = fs.readFileSync(epubPath);
+  const zip = await JSZip.loadAsync(bytes);
+  const ttfBytes = fs.readFileSync(ttfPath);
+  const fontName = path.basename(ttfPath);
+  zip.file(`OEBPS/${fontName}`, ttfBytes);
+  const opfPath = 'OEBPS/content.opf';
+  const opfFile = zip.file(opfPath);
+  if (!opfFile) {
+    fs.writeFileSync(epubPath, await zip.generateAsync({ type: 'nodebuffer' }));
+    return;
+  }
+  let opf = await opfFile.async('string');
+  const manifestEntry = `<item id="font-${path.basename(fontName, '.ttf')}" href="${fontName}" media-type="application/x-font-ttf"/>`;
+  if (!opf.includes('manifest')) {
+    opf = opf.replace('</package>', `<manifest>${manifestEntry}</manifest></package>`);
+  } else if (!opf.includes(fontName)) {
+    opf = opf.replace('</manifest>', `${manifestEntry}</manifest>`);
+  }
+  zip.file(opfPath, opf);
+  fs.writeFileSync(epubPath, await zip.generateAsync({ type: 'nodebuffer' }));
+}
+
+module.exports = { withEpubEmbedFontArgs, embedEpubFont };