From 2e1616f18ca7f79772c1407c7dac8f7b7b1d680e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcel=20Fabian=20Kr=C3=BCger?= <zauguin@gmail.com>
Date: Wed, 24 Jul 2019 18:04:04 +0200
Subject: [PATCH] Allow setting PDF version number

In contrast to LuaTeX, the version number does not affect the used PDF
features and can be changed at any time.
---
 luametalatex-back-pdf.lua      | 3 ++-
 luametalatex-baseregisters.tex | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/luametalatex-back-pdf.lua b/luametalatex-back-pdf.lua
index 253f566..9f5ca1d 100644
--- a/luametalatex-back-pdf.lua
+++ b/luametalatex-back-pdf.lua
@@ -58,7 +58,8 @@ callback.register("stop_run", function()
     pfile:indirect(id, require'luametalatex-pdf-font'(pfile, f, sorted))
   end
   pfile.root = pfile:getobj()
-  pfile:indirect(pfile.root, string.format([[<</Type/Catalog/Version/1.7/Pages %i 0 R>>]], pfile:writepages()))
+  pfile.version = string.format("%i.%i", pdf.variable.majorversion, pdf.variable.minorversion)
+  pfile:indirect(pfile.root, string.format([[<</Type/Catalog/Version/%i.%i/Pages %i 0 R>>]], pfile.version, pfile:writepages()))
   pfile.info = write_infodir(pfile)
   pfile:close()
 end, "Finish PDF file")
diff --git a/luametalatex-baseregisters.tex b/luametalatex-baseregisters.tex
index ad51020..3b2e370 100644
--- a/luametalatex-baseregisters.tex
+++ b/luametalatex-baseregisters.tex
@@ -77,6 +77,8 @@
 \texAlloc{dimen}{pagewidth}{297mm}
 \pdfAlloc{dimen}{horigin}{1in}
 \pdfAlloc{dimen}{vorigin}{1in}
+\pdfAlloc{count}{majorversion}{1}
+\pdfAlloc{dimen}{minorversion}{7}
 \directlua{
   lua.prepared_code[\csstring#lua.prepared_code+1] = tex.toks[0] .. "end"
   \the\toks0