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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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