From 128814a838037a92a75d9e632cc3f1650ebdb351 Mon Sep 17 00:00:00 2001
From: Rodrigo Coacci <rcoacci@gmail.com>
Date: Thu, 18 Aug 2022 12:45:49 -0300
Subject: [PATCH] Add EPUB output option.

Simple epub ebook format generation using tex4ebook, alongside PDF.
The config file is necessary for correct image sizing.
---
 Makefile  |  8 ++++++--
 ebook.cfg | 10 ++++++++++
 2 files changed, 16 insertions(+), 2 deletions(-)
 create mode 100644 ebook.cfg

diff --git a/Makefile b/Makefile
index 9aaa8e1..a269af2 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ TEX=\
 	$(T)/lock2.tex\
 	$(T)/sum.tex\
 
-all: book.pdf
+all: book.pdf book.epub
 .PHONY: all src clean
 
 $(T)/%.tex: %.tex | src
@@ -36,9 +36,13 @@ book.pdf: src book.tex $(TEX)
 	pdflatex book.tex
 	pdflatex book.tex
 
+book.epub: src book.tex $(TEX) ebook.cfg book.pdf
+	ebb -x fig/*.pdf
+	tex4ebook -c ebook.cfg book.tex
+
 clean:
 	rm -f book.aux book.idx book.ilg book.ind book.log\
-	 	book.toc book.bbl book.blg book.out
+	 	book.toc book.bbl book.blg book.out book.epub
 	rm -rf latex.out
 	rm -rf $(SRC)
 
diff --git a/ebook.cfg b/ebook.cfg
new file mode 100644
index 0000000..1dc74c6
--- /dev/null
+++ b/ebook.cfg
@@ -0,0 +1,10 @@
+
+% Snippet from https://tex.stackexchange.com/a/563314
+\Preamble{xhtml}
+\makeatletter
+\ExplSyntaxOn
+\Configure{Gin-dim}{style="width:\fp_eval:n{round(\Gin@req@width/\textwidth*100,2)}\char_generate:nn { `\% } { 12 }"}
+\ExplSyntaxOff
+\makeatother
+\begin{document}
+\EndPreamble
\ No newline at end of file