From dc7ee5e76a5fed077ca7650216cc27a8a0e05b3f Mon Sep 17 00:00:00 2001
From: Frieder Schrempf <dev@fris.de>
Date: Sat, 8 May 2021 19:07:13 +0200
Subject: [PATCH] Fix multi page rendering by setting global $INFO

In case of rendering multiple pages into a single document, the
context of the current page does not match the one of the pages
to be rendered. In some cases (e.g. with the struct plugin), the
global $INFO is evluated and as this is not set to match the page
to be rendered, the struct plugin does not produce the expected
output in the PDF.

Fix this by setting $INFO to match the current page to be rendered
and restoring it afterwards.

Signed-off-by: Frieder Schrempf <dev@fris.de>
---
 action.php | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/action.php b/action.php
index 8b5a69c0..a558ba83 100644
--- a/action.php
+++ b/action.php
@@ -348,10 +348,17 @@ protected function p_wiki_dw2pdf($id, $rev = '', $date_at = '') {
 
         if(!file_exists($file)) return '';
 
-        //ensure $id is in global $ID (needed for parsing)
+        /*
+         * Ensure that global $ID and $INFO are set to match the page
+         * to be rendered in order for the rendering and other plugins
+         * to work properly.
+         */
         global $ID;
-        $keep = $ID;
-        $ID   = $id;
+        global $INFO;
+        $keepid = $ID;
+        $keepinfo = $INFO;
+        $ID = $id;
+        $INFO = pageinfo();
 
         if($rev || $date_at) {
             $ret = p_render('dw2pdf', p_get_instructions(io_readWikiPage($file, $id, $rev)), $info, $date_at); //no caching on old revisions
@@ -359,8 +366,9 @@ protected function p_wiki_dw2pdf($id, $rev = '', $date_at = '') {
             $ret = p_cached_output($file, 'dw2pdf', $id);
         }
 
-        //restore ID (just in case)
-        $ID = $keep;
+        // Restore ID and INFO (just in case)
+        $ID = $keepid;
+        $INFO = $keepinfo;
 
         return $ret;
     }