From 864746328c2dc5a1bf66f99307365d0d0097e9cf Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Thu, 14 Mar 2024 04:05:41 +0100
Subject: add make targets diff-*

---
 Makefile    | 25 +++++++++++++++++++++++++
 _quarto.yml |  1 +
 2 files changed, 26 insertions(+)

diff --git a/Makefile b/Makefile
index 2a5dd64..73690df 100644
--- a/Makefile
+++ b/Makefile
@@ -87,3 +87,28 @@ $(ARTICLES:%=turtle-from-%): turtle-from-%: _site/%/index.pdf
 $(ARTICLES:%=dotgraph-from-%): dotgraph-from-%: _site/%/index.pdf
 	@bin/xmp2rdfxml _site/$*/index.pdf \
 	| rapper -i rdfxml -o dot - $(BASE_IRI)$*/
+
+diff-all: $(ARTICLES:%=diff-of-%)
+
+$(ARTICLES:%=diff-of-%): diff-of-%: %/changes.tex
+
+$(ARTICLES:%=%/changes.tex): %/changes.tex: %/a.tex %/b.tex
+	latexdiff --type CULINECHBAR --subtype COLOR --replace-context2cmd '' $^ > $*/index_diff.tex
+	perl -i -pe 's/\[pdftex\]{changebar}/[luatex]{changebar}/g' $*/index_diff.tex
+	latexmk --gg --lualatex --cd --silent --Werror $*/index_diff.tex
+	find $*/ -name 'index_diff.*' -not -name index_diff.pdf -delete
+	rm -f $^
+
+$(ARTICLES:%=%/a.tex): %/a.tex:
+	git switch --detach $(shell git describe --tags --abbrev=0)
+	QUARTO_LOG_LEVEL=quiet \
+	quarto render $*/index.qmd --to pdf -M keep-tex:true --output a.pdf
+	mv --force $*/index.tex $@
+	rm --force _site/a.pdf
+
+$(ARTICLES:%=%/b.tex): %/b.tex:
+	git switch -
+	QUARTO_LOG_LEVEL=quiet \
+	quarto render $*/index.qmd --to pdf -M keep-tex:true --output b.pdf
+	mv --force $*/index.tex $@
+	rm --force _site/b.pdf
diff --git a/_quarto.yml b/_quarto.yml
index b8740f5..1afba7d 100644
--- a/_quarto.yml
+++ b/_quarto.yml
@@ -65,6 +65,7 @@ filters:
   - diagram
 
 resources:
+  - "*/changes.pdf"
   - "events/*/*.ics"
   - "events/*/index.html"
   - fonts
-- 
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