#!/usr/bin/env bash
# Sets the text read from stdin as the Sway wallpaper.

TEXT=$(< /dev/stdin)
TEMPDIR=$(mktemp -d)
FONT_SIZE=18

swaymsg -t get_outputs | jq -r '.[] | "\(.name) \(.rect.width) \(.rect.height)"'\
| while read -r name width height; do
    file="$TEMPDIR/${name}".png
    offset=$(($height / 20))
    width=$(($width - $offset))
    height=$(($height - $offset))
    magick -size ${width}x$height xc:black -font "DejaVu-Sans-Mono" -pointsize $FONT_SIZE -fill white \
      -annotate +0+15 "$TEXT" $file
    sway output "$name" bg $file center
done

sleep 0.1 # sway reads the wallpaper in a different process, so wait a bit
rm -r "$TEMPDIR"