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#!/bin/bash
#
# Compare two PDF files.
# Dependencies:
# - pdfinfo (xpdf)
# - pdfjam (texlive-extra-utils)
# - diffpdf
#
MAX_HEIGHT=15840 #The maximum height of a page (in points), limited by pdfjam.
TMPFILE1=$(mktemp /tmp/XXXXXX.pdf)
TMPFILE2=$(mktemp /tmp/XXXXXX.pdf)
usage="usage: scrolldiff -h FILE1.pdf FILE2.pdf
-h print this message
v0.0"
while getopts "h" OPTIONS ; do
case ${OPTIONS} in
h|-help) echo "${usage}"; exit;;
esac
done
shift $(($OPTIND - 1))
if [ -z "$1" ] || [ -z "$2" ] || [ ! -f "$1" ] || [ ! -f "$2" ]
then
echo "ERROR: input files do not exist."
echo
echo "$usage"
exit
fi
#Get the number of pages:
pages1=$( pdfinfo "$1" | grep 'Pages' - | awk '{print $2}' )
pages2=$( pdfinfo "$2" | grep 'Pages' - | awk '{print $2}' )
numpages=$pages2
if [[ $pages1 > $pages2 ]]
then
numpages=$pages1
fi
#Get the paper size:
width1=$( pdfinfo "$1" | grep 'Page size' | awk '{print $3}' )
height1=$( pdfinfo "$1" | grep 'Page size' | awk '{print $5}' )
width2=$( pdfinfo "$2" | grep 'Page size' | awk '{print $3}' )
height2=$( pdfinfo "$2" | grep 'Page size' | awk '{print $5}' )
if [ $(bc <<< "$width1 < $width2") -eq 1 ]
then
width1=$width2
fi
if [ $(bc <<< "$height1 < $height2") -eq 1 ]
then
height1=$height2
fi
height=$( echo "scale=2; $height1 * $numpages" | bc )
if [ $(bc <<< "$MAX_HEIGHT < $height") -eq 1 ]
then
height=$MAX_HEIGHT
fi
papersize="${width1}pt,${height}pt"
#Make the scrolls:
pdfj="pdfjam --nup 1x$numpages --papersize {${papersize}} --outfile"
$pdfj "$TMPFILE1" "$1"
$pdfj "$TMPFILE2" "$2"
diffpdf "$TMPFILE1" "$TMPFILE2"
rm -f $TMPFILE1 $TMPFILE2
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