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#!/bin/bash
set -e
if [ "$#" -ne 3 ]; then
echo "Usage: $0 filename width height"
exit 1
fi
dim=( $(convert "$1" -format "%w %h" info:) )
w=${dim[0]}
h=${dim[1]}
pw=$(($2*8))
ph=$(($3*14))
height=auto
width=auto
if [ $pw -lt $w ] && [ $ph -lt $h ]; then
newh=$(echo "($h*$pw)/$w" | bc)
neww=$(echo "($w*$ph)/$h" | bc)
if [ $newh -le $ph ]; then
width=$pw
else
height=$ph
fi
elif [ $pw -lt $w ]; then
width=$pw
elif [ $ph -lt $h ]; then
height=$ph
fi
# debugging stuff
# echo pw=$pw ph=$ph
# echo w=$w h=$h
# echo neww=$neww newh=$newh
# exec echo width=$width height=$height
# account for GNU screen
if [ -n "$STY" ]; then
popt=-P
fi
exec img2sixel $popt --width=$width --height=$height "$1"
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