optimise pacakge count command for nixos

ufetch-nixos

@@ -9,9 +9,14 @@ host="$(hostname)"
 os="$(nixos-version)"
 kernel="$(uname -sr)"
 uptime="$(uptime | awk -F, '{sub(".*up ",x,$1);print $1}' | sed -e 's/^[ \t]*//')"
-packages="$(ls -d -1 /nix/store/*/ | wc -l)"
 shell="$(basename "${SHELL}")"
 
+for profile in $NIX_PROFILES; do
+	if [ -d "$profile" ]; then
+		packages="$((packages + $( (nix-store -q --requisites "$profile" 2>/dev/null || printf '') | wc -l)))"
+	fi
+done
+
 ## UI DETECTION
 
 parse_rcs() {