From 603f648a8618cc39d8ec8d5c6d08e7f5a6bab16e Mon Sep 17 00:00:00 2001
From: Peter Nerlich <peter.nerlich+dev@googlemail.com>
Date: Thu, 23 Sep 2021 02:09:15 +0200
Subject: [PATCH] ensure back cover is on the last page of the brochure

---
 cover/back.tex | 9 ++++++++-
 macros.tex     | 2 ++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/cover/back.tex b/cover/back.tex
index 805db1a..65e4344 100644
--- a/cover/back.tex
+++ b/cover/back.tex
@@ -1,4 +1,11 @@
-\newpage
+\cleardoubleevenemptypage
+%make sure we are on a page divisible by 4 for the brochure to work out
+\ifcase\numexpr \modulo{\value{page}}{4} \relax
+\or%
+\or%
+\thispagestyle{empty}\hbox{}\cleardoubleevenemptypage\or%
+\relax%
+\fi%
 \thispagestyle{empty} %keine Seitenzahl
 \color{white}
 
diff --git a/macros.tex b/macros.tex
index 3584e25..4f2b5d9 100644
--- a/macros.tex
+++ b/macros.tex
@@ -37,3 +37,5 @@
     \href{#1}{\@tmpkey}%
 }
 \makeatother
+
+\def\modulo#1#2{\ifnum#1=0 0\else(#1-#2*((2*#1-#2)/(2*#2)))\fi}