#!/bin/bash
# It crops and converts the pdf file into pdf file,

# HIRES="%%HiResBoundingBox"
# HIRES="%%BoundingBox"

E_BADARGS=1
while getopts ":rh" opt; do
  case $opt in
    r)
        if [ "${OPTARG:0:1}" = "-" ]; then
                echo "Invalid parameter \"${OPTARG}\" provided for agurment \"-${opt}!\""
                hflag=1
        else
#               echo "-n was triggered! Parameter: $OPTARG" >&2
                rflag=1
        fi
      ;;
    h)
        if [ "${OPTARG:0:1}" = "-" ]; then
                echo "Invalid parameter \"${OPTARG}\" provided for agurment \"-${opt}!\""
                hflag=1
        else
#               echo "-h was triggered! Parameter: $OPTARG" >&2
                hflag=1
        fi
      ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      hflag=1
      E_BADARGS=65
      ;;
    :)
      echo "Option -$OPTARG requires an argument." >&2
      hflag=1
      E_BADARGS=65
      ;;
  esac
done

shift $(($OPTIND - 1))

function help {
    echo -e "Usage: \t$0 [-r] <basefilename.pdf>"
    echo -e "This script generates the zero-margin cropped version of the input pdf file with suffix -crop."
    echo -e "Option -r: if this option is specified, the input file is replaced by the cropped version."
}

if [ "$#" -lt 1 ] || [ "$hflag" ]; then
    help
    exit $E_BADARGS
fi

EXT=$(echo "${1##*.}" | awk '{print tolower($0)}')
if [ "${EXT}" != "pdf" ]; then
    echo "Ops! No pdf file!"
    help
    exit $E_BADARGS    
fi

basename=$(basename ${1} .pdf)
dirname=$(dirname ${1})

echo "Cropping $1 ..."
if [ "$rflag" == "1" ]; then
    pdfcrop -hires "${dirname}/${basename}.pdf" "${dirname}/${basename}-crop.pdf"
    echo "${dirname}/${basename}-crop.pdf -> ${dirname}/${basename}.pdf"
    mv -f "${dirname}/${basename}-crop.pdf" "${dirname}/${basename}.pdf"
else
    pdfcrop -hires "${dirname}/${basename}.pdf" "${dirname}/${basename}-crop.pdf"
fi
	# BBOX=$(gs -dSAFER -dNOPAUSE -dBATCH -sDEVICE=bbox  $(basename ${a} .pdf)".pdf" 2>&1 | awk '$1 ~ /'${HIRES}'/ {printf "%s %s %s %s", $2, $3, $4, $5}' )
	# gs -sOutputFile=$(basename ${a} .pdf)"-crop.pdf" \
	#     -sDEVICE=pdfwrite  -dCompatibilityLevel=1.4 \
        #     -dNOPAUSE -dBATCH \
	#     -c "[/CropBox [${BBOX}] /PAGES pdfmark" \
	#     -f $(basename ${a} .pdf)".pdf"