From 6fca1d0623f10b5a46eab6437f4e698ab5a1c353 Mon Sep 17 00:00:00 2001
From: Johan Thelin <johan@eperoto.com>
Date: Fri, 20 May 2022 17:43:15 +0200
Subject: [PATCH] Add the ability to inject front page(s)

---
 README.md          | 2 ++
 package.json       | 2 +-
 src/extendCli.js   | 2 ++
 src/generatePdf.js | 8 ++++++++
 4 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 0dc2ba3..60ebf86 100644
--- a/README.md
+++ b/README.md
@@ -11,12 +11,14 @@ This is a fork of @snowdog/vuepress-plugin-pdf-export. All changes are available
 - Designed to work well in headless environments like CI runners
 - Can filter and sort pages.
 - Can generate a rudimentary table of contents
+- Can insert a front page (or front pages)
 
 ## Config options
 - `theme` - theme name (default `@vuepress/default`)
 - `sorter` - function for changing pages order (default `false`)
 - `filter` - function for filtering the pages (default `false`)
 - `tocLevel` - function returning a TOC level for the pages, i.e. zero or one (default `false`)
+- `frontPage` - path to a pdf to inject first in the document. Typically a front page, but can be multiple pages too.
 - `outputFileName` - name of output file (default `site.pdf`)
 - `puppeteerLaunchOptions` - [Puppeteer launch options object](https://github.com/puppeteer/puppeteer/blob/v2.1.1/docs/api.md#puppeteerlaunchoptions) (default `{}`)
 - `pageOptions` - [Puppeteer page formatting options object](https://github.com/puppeteer/puppeteer/blob/v2.1.1/docs/api.md#pagepdfoptions) (default `{format: 'A4'}`)
diff --git a/package.json b/package.json
index 996a1d5..aebec03 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@e8johan/vuepress-plugin-pdf-export",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "license": "MIT",
   "repository": "e8johan/vuepress-plugin-pdf-export",
   "scripts": {
diff --git a/src/extendCli.js b/src/extendCli.js
index 46fdedb..404eaa4 100644
--- a/src/extendCli.js
+++ b/src/extendCli.js
@@ -10,6 +10,7 @@ module.exports = options => {
   const sorter = options.sorter || false
   const filter = options.filter || false
   const tocLevel = options.tocLevel || false
+  const frontPage = options.frontPage || false
   const outputFileName = options.outputFileName || 'site.pdf'
   const puppeteerLaunchOptions = options.puppeteerLaunchOptions || {}
   const pageOptions = options.pageOptions || {}
@@ -37,6 +38,7 @@ module.exports = options => {
             sorter,
             filter,
             tocLevel,
+            frontPage,
             outputFileName,
             puppeteerLaunchOptions,
             pageOptions
diff --git a/src/generatePdf.js b/src/generatePdf.js
index ee910da..eea8c98 100644
--- a/src/generatePdf.js
+++ b/src/generatePdf.js
@@ -39,6 +39,7 @@ module.exports = async (ctx, {
   sorter,
   filter,
   tocLevel,
+  frontPage,
   outputFileName,
   puppeteerLaunchOptions,
   pageOptions
@@ -143,6 +144,13 @@ module.exports = async (ctx, {
         paddingBottom: 37.6 * pdf.mm,
       });
 
+      if (frontPage !== false) {
+        const file = fs.readFileSync(frontPage)
+        const page = new pdf.ExternalDocument(file)
+        mergedPdf.addPagesOf(page);
+        tocPageCount += page.pageCount;
+      }
+
       if (toc.length > 0) {
         _createToc(mergedPdf, toc, tocPageCount);
       } else {