#!/bin/bash
# When called as Z-, this script zooms out. When called as Z+, it zooms in.
# Pass the font size delta as the second argument. If none is given, 1 is assumed.
set -eu

font=$(9p read acme/$winid/ctl | awk '{ print $7 }')

# Get current font size
cursz=$(echo "$font" | awk -F '/' '{ print $(NF - 1) }')

delta=${1:-1}

case "$(basename $0)" in
	Z-)
		incr=-$delta
		;;
	Z+)
		incr=+$delta
		;;
	*)
		echo wat
		incr=+$delta
		;;
esac

# Get new size
# Hack: This assumes antialiased fonts always
newsz=$(($(echo "$cursz" | tr -dc '[0-9]') + "$incr"))a

# New font
newfont=$(echo "$font" | awk -v newsz="$newsz" -F'/' '{ print "/mnt/font/"$4"/"newsz"/font" }')
printf "font %s\n" "$newfont" | 9p write acme/$winid/ctl