From fc7127b769f3136b2711a2cf45215b3d8ee13581 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rn-Michael=20Miehe?=
 <joern-michael.miehe@lenaisten.de>
Date: Sun, 11 May 2025 20:49:17 +0000
Subject: [PATCH] PDF and PDF/A postprocessing

---
 Makefile | 56 ++++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 46 insertions(+), 10 deletions(-)

diff --git a/Makefile b/Makefile
index 359cdeb..c5314ba 100644
--- a/Makefile
+++ b/Makefile
@@ -36,25 +36,61 @@ texInt: $(texFilesInt)
 # Recipes #
 ###########
 
-compile = pandoc \
-	$(1) \
+compile_md = pandoc \
+	$(2) \
 	--standalone \
 	--from markdown \
-	--to latex \
+	--to $(1) \
 	--template lenaisten \
 	--variable colorlinks:true \
 	--variable csquotes:true \
 	--variable lang:de-DE \
-	--output $(2)
+	--output $(3)
+
+GSFLAGS := \
+	-sDEVICE=pdfwrite \
+	-dNOOUTERSAVE \
+	-dNOPAUSE \
+	-dQUIET \
+	-dBATCH
+
+postprocess_pdf = gs \
+	$(GSFLAGS) \
+	-sPAPERSIZE=a4 \
+	-dFIXEDMEDIA \
+	-dPDFFitPage \
+	-dCompatibilityLevel=1.7 \
+	-dPDFSETTINGS=/ebook \
+	-sOutputFile=$(2) \
+	$(1) \
+	2>/dev/null
+
+convert_pdfa = /opt/pdfa/bin/gs-919-linux_x86_64 \
+	$(GSFLAGS) \
+	-dPDFA=2 \
+	-sProcessColorModel=DeviceRGB \
+	-dPDFACompatibilityPolicy=1 \
+	-sOutputFile=$(2) \
+	/opt/pdfa/PDFA_def.ps \
+	$(1) \
+	2>/dev/null
+
+md2pdf = $(call compile_md,pdf,$(1),-) | $(call postprocess_pdf,-,$(2))
+
+md2pdfa = $(call md2pdf,$(1),-) | $(call convert_pdfa,-,$(2))
+
+# pdf
 
 %$(suffixPub).pdf: %.md lenaisten-defs.sty
-	python3 ./redact.py $< | $(call compile,-,$@)
-
-%$(suffixPub).tex: %.md lenaisten-defs.sty
-	python3 ./redact.py $< | $(call compile,-,$@)
+	python3 ./redact.py $< | $(call md2pdfa,-,$@)
 
 %$(suffixInt).pdf: %.md lenaisten-defs.sty
-	python3 ./redact.py -i $< | $(call compile,-,$@)
+	python3 ./redact.py -i $< | $(call md2pdfa,-,$@)
+
+# tex
+
+%$(suffixPub).tex: %.md lenaisten-defs.sty
+	python3 ./redact.py $< | $(call compile_md,latex,-,$@)
 
 %$(suffixInt).tex: %.md lenaisten-defs.sty
-	python3 ./redact.py -i $< | $(call compile,-,$@)
+	python3 ./redact.py -i $< | $(call compile_md,latex,-,$@)