[Convert HTML slides to PDF with decktape]

slides2pdf.sh

#!/usr/bin/env bash
#: Name        : slides2pdf
#: Date        : 2020-10-05
#: Author      : Alexandre Boucaud
#: Version     : 1.0.0
#: Description : Convert HTML slides to PDF with decktape
#: Options     : See usage() function.

## Initialize defaults
WEBSITE="https://github.com/astefanutti/decktape"
LOCALHOST_NAME="http://host.docker.internal"
CONTAINER="astefanutti/decktape"
DOCKER_OPTIONS="--rm -t"
LOCALHOST_OPTION="--net=host"
MAC_FONTS_MOUNT="-v ${HOME}/Library/Fonts:/home/node/.local/share/fonts"
SLIDES_MOUNT="-v `pwd`:/slides"
DRY_RUN=0
UPDATE=0
LOCALHOST=0
OUTPUTFILE="slides.pdf"

set -e
# set -exo pipefail

function usage() {
  echo "usage: ${0} [-h] [-n DRYRUN?] [-l LOCALHOST?] [-u UPDATE?] [-o output_pdf_name] <slides_url>"
}

## For each provided option arg
while getopts ":hnluo:" opt
do
  case "$opt" in  
    h) usage && exit 0 ;;
    n) DRY_RUN=1 ;;
    l) LOCALHOST=1 ;;
    u) UPDATE=1 ;;
    o) OUTPUTFILE="$OPTARG" ;;
    \?) echo "Invalid option $OPTARG" && exit 1 ;;
  esac
done

## Remove options from args
shift "$(( $OPTIND - 1 ))"

## Unless source_file arg(s) found, print usage and exit (0 to avoid breaking pipes)
if [[ ! -n "$1" ]]; then
  usage
  exit 1
fi

slides_url=$1

if [ $LOCALHOST -eq 1 ]; then
  # Replace localhost name with docker pattern
  slides_url=${slides_url/"http://localhost"/$LOCALHOST_NAME}
  slides_url=${slides_url/"http://127.0.0.1"/$LOCALHOST_NAME}

  DOCKER_OPTIONS="${DOCKER_OPTIONS} ${LOCALHOST_OPTION} ${MAC_FONTS_MOUNT}"
fi
DOCKER_OPTIONS="${DOCKER_OPTIONS} ${SLIDES_MOUNT}"

function main() {
  if [ $UPDATE -eq 1 ]; then
    docker pull ${CONTAINER}
  fi

  docker run ${DOCKER_OPTIONS} ${CONTAINER} ${slides_url} ${OUTPUTFILE}
}

function dry_run() {
  echo "--- Begin dry run mode."
  echo ""
  echo "This will run the following commands :"
  if [ $UPDATE -eq 1 ]; then
    echo "  docker pull ${CONTAINER}"
  fi
  echo "  docker run ${DOCKER_OPTIONS} ${CONTAINER} ${slides_url} ${OUTPUTFILE}"
  echo ""
  echo "--- End dry run mode."
}

function test_docker_installed() {
  command -v "docker" > /dev/null || (echo "Please install Docker to use slide2pdf => https://www.docker.com/get-started" && exit 1)
}

function test_docker_running() {
  $(command -v "docker") ps > /dev/null || (echo "Please start the Docker deamon to use slide2pdf." && exit 1)
}

function run_main() {
  if [ $DRY_RUN -eq 1 ]; then
    dry_run
  else
    test_docker_installed
    test_docker_running

    main
  fi
  echo ""
  echo "Powered by decktape : ${WEBSITE}"
}

run_main