#!/bin/sh
# env
# Written in 2022 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/>.

FACESIZES="10.5 6.0 8.0 9.0 10.5 12.0 18.0"
BASEDPI=96

targetdpi=96
if command -v xdpyinfo >/dev/null 2>&1; then
	targetdpi=$(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 [ -z "$min" ]; then
			echo 96
		else
			echo "$min / 2" | bc -l
		fi
	})
fi

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 [ $i -eq 0 ]; then
			printf "XTerm.VT100.faceSize:\t%.1f\n" "$v"
		else
			printf "XTerm.VT100.faceSize%d:\t%.1f\n" $i "$v"
		fi
		i=$(($i + 1))
	done
} | xrdb -merge