chbg: utilize XDG directories

bin/chbg

@@ -2,22 +2,21 @@
 # to change wallpapers both niri workspace and niri tab view
 [ -z "$1" ] && { echo "Usage: $0 <image-file>"; exit 1; }
 
-WP_DIR="$HOME/.local/share"
+WP_DIR="${XDG_DATA_HOME:-$HOME/.local/share}"
 finput=$1
 
-fw=$(magick identify -format "%w\n" $1)
-fh=$(magick identify -format "%h\n" $1)
-if [[ $((fw)) > 3840 && $((fh)) > 2160 ]]
-then
-	finput="/tmp/${finput##*/}"
+read -r fw fh < <(magick identify -format "%w %h" -- "$1")
+(( fw > 3840 && fh > 2160 )) && {
+	finput="${XDG_CACHE_HOME:-$HOME/.cache}/${finput##*/}"
 	echo "WARNING: image too large, resizing ..."
 	magick $1 -resize "3840x2160^" $finput
-fi
+}
 
 echo -n "making blurred version of $finput ... "
 mkdir -p $WP_DIR
 cp $finput $WP_DIR/.wallpaper
 magick $WP_DIR/.wallpaper -filter Gaussian -blur 0x30 $WP_DIR/.wallpaper_blur
+[[ $finput == "${XDG_CACHE_HOME:-$HOME/.cache}"* ]] && rm -f $finput
 echo "Done."
 
 swww img $WP_DIR/.wallpaper