md-to-pdf/md-to-pdf

#!/usr/bin/env bash

SCRIPT_TITLE=md-to-pdf
depends=(chromium cmark-gfm)
optdepends=()

# Uncomment for debugging:
exec 1> "${HOME}"/"${SCRIPT_TITLE}".log 2>&1
set -x

#######


function command_exists(){
  command -v "$1" > /dev/null
}

function notify() {
  # $1: Message summary
  # $2: Message body
  # $3-n: notify-send options

  if command_exists notify-send; then
    notify-send "$@";
  else
    # Write message to stderr
    printf '%s: %s\n' "$1" "$2" 1>&2;
  fi
}

function check_depends() {
  for dep in "${depends[@]}"; do
    if ! command_exists "${dep}"; then
      notify "${SCRIPT_TITLE}" "The dependency ${dep} is missing!" --icon=dialog-information;
      exit 1;
    fi
  done

  for dep in "${optdepends[@]}"; do
    if ! command_exists "${dep}"; then
      # Inform about missing opt. dependency on /dev/stderr
      printf 'Info: The optional dependency %s is missing.' "${dep}" 1>&2;
    fi
  done
}

check_depends

# read newline-delimited absolute paths of selected files (on local filesystem)
echo "$NAUTILUS_SCRIPT_SELECTED_FILE_PATHS" | while read file; do
  # If $NAUTILUS_SCRIPT_SELECTED_FILE_PATHS contains a tailing newline,
  # $file may be the empty string
  if [ "${file}" = '' ]; then
    continue;
  fi

  html="${file}".html;
  pdf="${file}".pdf;

  # Convert
  cmark-gfm "${file}" --to html --unsafe > "${html}" || notify "${SCRIPT_TITLE}" "Conversion of ${file} to html failed!" --icon=dialog-information;
  chromium --headless --disable-gpu --print-to-pdf="${pdf}" file://"${html}" || notify "${SCRIPT_TITLE}" "Conversion of ${html} to pdf failed!" --icon=dialog-information;

  # Cleanup
  rm "${html}" || notify "${SCRIPT_TITLE}" "Could not delete intermediate file ${html}!" --icon=dialog-information;
done

notify "${SCRIPT_TITLE}" 'Done!' --icon=dialog-information;