image-hct: Material Color scoring utility

Rust utility using the material_colors crate to score colors of e.g., a wallpaper and return the Hue, Chrome, and Tone of its highest scoring color. Used in conjunction with matugen to set theme and scheme dynamically based on those HCT values. Usage example:

#!/bin/bash
set -euo pipefail

if [ ! -d ~/Pictures/wallpapers/ ]; then
   wallpaper_path="$HOME/Pictures/default_wallpaper"
   echo "Required directory: $HOME/Pictures/wallpapers not found. Fallback to default wallpaper"
else
   wallpaper_path="$(fd . "$HOME/Pictures/wallpapers" -t f | shuf -n 1)"
fi

apply_hyprpaper() {

   # Preload the wallpaper once, since it doesn't change per monitor
   hyprctl hyprpaper preload "$wallpaper_path"

   # Set wallpaper for each monitor
   hyprctl monitors | rg 'Monitor' | awk '{print $2}' | while read -r monitor; do
   hyprctl hyprpaper wallpaper "$monitor, $wallpaper_path"
   done
}

if [ "$(image-hct "$wallpaper_path" tone)" -gt 60 ]; then
   mode="light"
else
   mode="dark"
fi

if [ "$(image-hct "$wallpaper_path" chroma)" -lt 20 ]; then
   scheme="scheme-neutral"
else
   scheme="scheme-vibrant"
fi

# Set Material colortheme

matugen -t "$scheme" -m "$mode" image "$wallpaper_path"

# unload previous wallpaper

hyprctl hyprpaper unload all

# Set the new wallpaper

apply_hyprpaper

# Get wallpaper image name & send notification

newwall=$(basename "$wallpaper_path")
notify-send "Colors and Wallpaper updated" "with image $newwall" -i "$wallpaper_path"

echo "DONE!"