/useful/trunk-1

#!/usr/bin/env bash

####

# FILE NAME pdf2images.sh

# 

# Authors:

#    Gustav Hartvigsson 2024

#    Distributed under the Cool Licence 1.1

#

# Changes:

#

#  2024-07-10

#    * Initial version

#    *

####

__FILE=""

__FIRST_PAGE=0

__LAST_PAGE=0

__SCALE=250

__SANITY=true

__HAS_OPTIPNG=false

__SCRIPT_ROOT=$(dirname $(readlink -f $0))

source $__SCRIPT_ROOT/useful.inc.sh

function __usage () {

  echo "pdf2images.sh --- Convert a range of pdf pages into pngs."

  echo "USAGE:"

  echo "    pdf2images.sh <file>.pdf <first page> <last page>"

  echo ""

}

function __sanity_check () {

  # Check that we have the tools needed.

  __find_tool pdftoppm

  __silent which optipng

  if [ $? -gt 0 ]; then

    echo "    Can't find tool \"optpng\" (Not required)."

    __HAS_OPTIPNG=false

  fi

  if [[ $__SANITY == false ]]; then

    echo ""

    echo "Please install the missing tools."

    echo ""

    exit 1

  fi

}

function __process () {

  pdftoppm -f $__FIRST\

           -l $__LAST\

           -r $__SCALE\

           -gray\

           -png\

           -progress\

           $__FILE\

           ${__FILE%%.*}

  if [[ $__HAS_OPTIPNG == true ]]; then

    optipng ${__FILE%%.*}*.png

  fi

}

function __parse_args () {

  if [ $# -eq 0 ]; then

    __usage

    exit 1

  fi

  __FILE=$1

  shift

  __FIRST=$1

  shift

  __LAST=$1

  shift

  if [ $# -ne 0 ]; then

    echo "Nummber of arguments missmatch."

    echo ""

    __usage

    exit 1

  fi

}

function __main () {

  __sanity_check

  __parse_args "${@}"

  __process

  exit 0

}

__main "${@}"