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#!/bin/bash
set -e
allfiles=$(echo *.png | sort)
atlasfiles=""
stems=""
for i in $allfiles
do
echo $i
if [[ $i =~ ^([a-z]+)[1-9].png ]]
then
stem=${BASH_REMATCH[1]}
output=$stem.png.tmp
if [[ $atlasfiles != *$output* ]]
then
montage $stem?.png -geometry 32x32 $output
atlasfiles="$atlasfiles $output"
stems="$stems $stem"
fi
fi
done
montage $atlasfiles -geometry 64x32+0+0 -gravity NorthWest -tile 1x atlas.png
rm -f $atlasfiles
echo $stems | tr ' ' '\n' > atlas.txt
exit 0
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