From 036593fbc852272b9029eb0727201667568be5a5 Mon Sep 17 00:00:00 2001
From: Peter Gillich <pgillich@gmail.com>
Date: Fri, 15 Mar 2024 19:00:16 +0100
Subject: [PATCH] Configurable font size in PDF

---
 README.md   | 28 ++++++++++++++++++++++++++++
 generate.sh |  8 ++++++++
 2 files changed, 36 insertions(+)

diff --git a/README.md b/README.md
index ecb4861..fa6d5d0 100644
--- a/README.md
+++ b/README.md
@@ -62,6 +62,7 @@ The build for the above Docker image can be audited at <https://hub.docker.com/r
 
 Requirements:
 
+- Make
 - Ruby
 - `gem install bundler`
 - `bundle install`
@@ -79,6 +80,33 @@ BOOK_SLUG='sre_book' ./generate.sh
 BOOK_SLUG='srw_book' ./generate.sh
 ```
 
+### PDF options
+
+Any option can be passed to `pandoc` by `PDF_OPT_` prefix, for example:
+
+```sh
+PDF_OPT_GEOMETRY=margin=1.5cm \
+PDF_OPT_DOCUMENTCLASS=extbook \
+PDF_OPT_FONTSIZE=14pt \
+PDF_OPT_MAINFONT=LiberationSerif-Regular.ttf \
+PDF_OPT_MAINFONTOPTIONS=BoldFont=LiberationSerif-Bold.ttf,ItalicFont=LiberationSerif-Italic.ttf,BoldItalicFont=LiberationSerif-BoldItalic.ttf \
+PDF_OPT_MONOFONT=LiberationMono-Regular.ttf \
+PDF_OPT_MONOFONTOPTIONS=BoldFont=LiberationMono-Bold.ttf,ItalicFont=LiberationMono-Italic.ttf,BoldItalicFont=LiberationMono-BoldItalic.ttf \
+PDF_OPT_SANSFONT=LiberationSans-Regular.ttf \
+PDF_OPT_SANSFONTOPTIONS=BoldFont=LiberationSans-Bold.ttf,ItalicFont=LiberationSans-Italic.ttf,BoldItalicFont=LiberationSans-BoldItalic.ttf \
+BOOK_SLUG=sre_book ./generate.sh
+```
+
+Default options passed to `pandoc` in `generate.sh` are overloaded by `PDF_OPT_` prefix, see `PDF_OPT_GEOMETRY` in above example.
+
+Fonts in above axample are packed to `fonts-liberation2` on **Ubuntu**.
+
+See more details:
+
+* <https://pandoc.org/MANUAL.html#fonts>
+* <https://ctan.org/pkg/extsizes>
+* <https://ctan.org/pkg/fontspec>
+
 # Known Issues
 
 - metadata is not complete. There are just too many authors
diff --git a/generate.sh b/generate.sh
index e001f49..bf6f94a 100755
--- a/generate.sh
+++ b/generate.sh
@@ -12,6 +12,13 @@ export ${BOOKS[${BOOK_SLUG^^}]}
 # Common vars.
 IMGS_DOMAIN="lh3.googleusercontent.com"
 
+PDF_OPTIONS=()
+for i in ${!PDF_OPT_*}; do
+    declare -n val=$i
+    key=${i#PDF_OPT_}
+    PDF_OPTIONS+=("-V" "${key,,}=${val}");
+done
+
 # Make sure that links are relative \
 # # Remove the /sre/ directories
 # Save stuff in html/ directory
@@ -96,6 +103,7 @@ pandoc --from=html \
     -V subparagraph \
     -V geometry=margin=2cm \
     -V fig_caption=false \
+    ${PDF_OPTIONS[@]} \
     --columns=60 \
     complete.html