env/utils/scripts/x-dpi-facesizes.sh

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#!/bin/sh
# env
# Written in 2022-2023 by Lucas
# CC0 1.0 Universal/Public domain - No rights reserved
#
# To the extent possible under law, the author(s) have dedicated all
# copyright and related and neighboring rights to this software to the
# public domain worldwide. This software is distributed without any
# warranty. You should have received a copy of the CC0 Public Domain
# Dedication along with this software. If not, see
# <http://creativecommons.org/publicdomain/zero/1.0/>.
usage()
{
printf "Usage: %s [-n] [targetdpi]\n" "${0##*/}" >&2
exit 1
}
err()
{
printf "%s: %s\n" "${0##*/}" "$*" >&2
exit 1
}
show=false
while getopts n flag; do
case $flag in
n) show=true ;;
*) usage ;;
esac
done
shift $((OPTIND - 1))
if [ $# -gt 1 ]; then
usage
fi
FACESIZES="8.0 4.0 6.0 7.0 8.0 9.0 10.0 12.0"
basedpi=$(xdpyinfo | grep '^ resolution:' | {
min=
while read -r line; do
set -- $line
dpi_x=${2%%x*}
dpi_y=${2##*x}
dpi_sum=$(( $dpi_x + $dpi_y ))
if [ -z "$min" ]; then
min=$dpi_sum
else
min=$(( $dpi_sum < $min ? $dpi_sum : $dpi ))
fi
done
if [ -n "$min" ]; then
echo "$min / 2" | bc -l
fi
})
if [ -z "$basedpi" ]; then
err "Can't find DPI"
fi
targetdpi=${1:-96}
for facesize in $FACESIZES; do
echo "$basedpi * $facesize / $targetdpi"
done | bc -l | {
i=0
printf "Xft.dpi:\t%.1f\n" "$targetdpi"
while read -r v; do
if [ $i -eq 0 ]; then
printf "XTerm.VT100.faceSize:\t%f\n" "$v"
else
printf "XTerm.VT100.faceSize%d:\t%f\n" $i "$v"
fi
i=$(($i + 1))
done
} | if $show; then
cat
else
xrdb -merge
fi