Is it possible to turn off syntax highlighting in Asciidoctor? - asciidoc

Question

I've used Asciidoctor to create my JHipster Mini-Book. It looks great in PDF, MOBI, EPUB, and HTML. I've also created a (PDF) version that's printable. The printable version goes though Lulu, and gets printed in black and white.
The printable PDF has its code listings in color, which causes the code listings to be hard to read when printed, especially if they're light gray (e.g., comments). Is there a way to turn off syntax-highlighting in Asciidoctor?

Answer 1

An easy way would be to not to say which language the code has. Just replace
[source,ruby]
----
require 'sinatra'
----
with
[source]
----
require 'sinatra'
----

Answer 2

Set attribute source-highlighter to html-pipeline, e.g. on CLI when calling asciidoctor:
asciidoctor -a source-highlighter=html-pipeline FILE

Answer 3

I figured out the answer with the help of #mojavelinux (Dan Allen) on Twitter. The key is not to pass in the source-highlighter argument.
Here's my generate-pdf.sh script after making this change.
#!/bin/bash
# Usage: `./generate-pdf.sh` to generate a printable 6x9" PDF with no syntax highlighting
# `./generate-pdf.sh screen` to generate a downloadable 8.5x11" PDF
source $HOME/.rvm/scripts/rvm
rvm use 2.3.1 --quiet
if [ ! -d .bundle/gems ]; then
rm -f Gemfile.lock
bundle config --local github.https true
bundle --path=.bundle/gems --binstubs=.bundle/.bin
fi
if [ -f "$rvm_path/scripts/rvm" ] && [ -f ".ruby-version" ] && [ -f ".ruby-gemset" ]; then
source "$rvm_path/scripts/rvm"
rvm use `cat .ruby-version`#`cat .ruby-gemset`
fi
ASCIIDOCTOR_PDF="./.bundle/.bin/asciidoctor-pdf"
OPTIMIZE_PDF="`bundle exec gem contents --show-install-dir asciidoctor-pdf`/bin/optimize-pdf"
ROOT_DIR=$(realpath $(dirname $0))
MEDIA=prepress
HIGHLIGHTING=""
if [ ! -z "$1" ]; then
MEDIA=$1
HIGHLIGHTING="-a source-highlighter=coderay"
fi
BASE_DIR="$ROOT_DIR/src/docs/asciidoc"
OUT_DIR="$ROOT_DIR/build/asciidoc/pdf-$MEDIA"
$ASCIIDOCTOR_PDF --trace -B "$BASE_DIR" \
-D "$OUT_DIR" \
-S unsafe \
-r "$ROOT_DIR/src/main/ruby/asciidoctor-pdf-extensions.rb" \
-a media=$MEDIA \
-a pdfmarks \
-a pdf-style=infoq-$MEDIA \
-a pdf-stylesdir="$BASE_DIR/styles/pdf" \
-a pdf-fontsdir="$BASE_DIR/styles/pdf/fonts" \
-a sourcedir=../../../main/webapp \
$HIGHLIGHTING \
-a imagesdir=images \
-a toc \
-a icons=font \
-a idprefix \
-a idseparator=- \
-a projectdir=../../.. \
-a rootdir=../../.. \
-a project-name=jhipster-book \
-a project-version=2.0.0-SNAPSHOT \
-a attribute-missing=warn \
"$BASE_DIR/index.adoc"
$OPTIMIZE_PDF "$OUT_DIR/index.pdf"
mv -f "$OUT_DIR/index-optimized.pdf" "$OUT_DIR/index.pdf"