PDF splitter of scanned documents using mupdf-tools (mutool poster)

pdf-split-scanned-document.sh

#!/bin/bash

SCRIPT_NAME="PDF splitter of scanned documents"
VERSION_NUMBER="v2024-02-02"
AUTHOR="Martin Brozkeff Malec - https://brozkeff.net"
LICENSE="MIT (https://opensource.org/license/mit/)"
# Shared on https://gist.github.com/brozkeff/b061b69800d3a08b088dfb89ca044fb5

echo "${SCRIPT_NAME} ${VERSION_NUMBER}"
echo "Author: ${AUTHOR}"
echo "License: ${LICENSE}"

# This script splits scanned PDF pages either vertically or horizontally down the middle,
# separating each page into two, and saves the result with a '-SPLIT' suffix.
# Usage: scriptname [-h | -v] input.pdf

split_direction="-x" # Default to vertical split
while getopts ":hv" option; do
  case $option in
    h) split_direction="-y" ;; # Horizontal split
    v) split_direction="-x" ;; # Vertical split (default)
    \?) echo "Invalid option: -$OPTARG" >&2
        exit 1 ;;
  esac
done
shift $((OPTIND -1))

# Determine and echo the chosen split direction
if [ "$split_direction" = "-x" ]; then
  echo "Selected split direction: Vertical"
else
  echo "Selected split direction: Horizontal"
fi

# Check if a filename is provided
if [ -z "$1" ]; then
  echo "No filename provided. Exiting..."
  exit 1
fi

OUTPUT_FILE="${1%.pdf}-SPLIT.pdf"

# Check for required tool 'mutool'
if ! command -v mutool &> /dev/null; then
  echo "This script requires 'mutool' to be installed."
  echo "Attempting to install 'mupdf-tools'. Please provide your password if prompted."
  sudo apt-get update
  sudo apt-get install -y mupdf-tools
fi

# Directly split each page using mutool based on the specified direction
mutool poster $split_direction 2 "$1" "$OUTPUT_FILE"

echo "Splitting completed. Output saved to '${OUTPUT_FILE}'."